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<div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/625faa002cc14f66365eb1c9/bg1.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">广西轻工业</div><div class="t m1 x2 h4 y3 ff2 fs1 fc0 sc0 ls0 ws0">GUA<span class="_ _0"></span>NGX<span class="_ _0"></span>I<span class="_ _1"> </span>JOURN<span class="_ _0"></span>AL<span class="_ _1"> </span>OF<span class="_ _1"> </span>L<span class="_ _0"></span>I<span class="_ _0"></span>GHT<span class="_ _1"> </span>IN<span class="_ _0"></span>DUS<span class="_ _0"></span>TRY</div><div class="t m2 x3 h5 y4 ff1 fs2 fc0 sc0 ls0 ws0">计<span class="_ _2"></span>算<span class="_ _2"></span>机<span class="_ _2"></span>与<span class="_ _2"></span>信<span class="_ _2"></span>息<span class="_ _2"></span>技<span class="_ _2"></span>术</div><div class="t m1 x4 h4 y5 ff2 fs1 fc0 sc0 ls0 ws0">2<span class="_ _2"></span>00<span class="_ _2"></span>8</div><div class="t m1 x5 h6 y6 ff1 fs3 fc0 sc0 ls0 ws0">年</div><div class="t m1 x6 h4 y5 ff2 fs1 fc0 sc0 ls0 ws0">2</div><div class="t m1 x7 h6 y6 ff1 fs3 fc0 sc0 ls0 ws0">月</div><div class="t m1 x8 h6 y7 ff1 fs3 fc0 sc0 ls0 ws0">第</div><div class="t m1 x9 h4 y8 ff2 fs1 fc0 sc0 ls0 ws0">2</div><div class="t m1 xa h6 y9 ff1 fs3 fc0 sc0 ls0 ws0">期<span class="_ _3"></span><span class="ff2">(<span class="_ _4"> </span><span class="ff1">总<span class="_ _2"></span>第</span></span></div><div class="t m1 xb h4 y8 ff2 fs1 fc0 sc0 ls0 ws0">1<span class="_ _2"></span>11</div><div class="t m1 xc h6 y9 ff1 fs3 fc0 sc0 ls0 ws0">期<span class="_ _5"></span><span class="ff2">)</span></div><div class="t m2 xd h7 ya ff2 fs4 fc0 sc0 ls0 ws0">1</div><div class="t m2 xe h8 yb ff1 fs5 fc0 sc0 ls0 ws0">引<span class="_ _2"></span>言</div><div class="t m2 xf h9 yc ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>用<span class="_ _2"></span>于<span class="_ _2"></span>处<span class="_ _2"></span>理<span class="_ _2"></span>数<span class="_ _2"></span>字<span class="_ _6"></span>信<span class="_ _2"></span>号<span class="_ _2"></span><span class="ff2">,<span class="_ _7"> </span></span>它<span class="_ _2"></span>通<span class="_ _2"></span>过<span class="_ _6"></span>一<span class="_ _2"></span>定<span class="_ _2"></span>的<span class="_ _6"></span>运<span class="_ _2"></span>算<span class="_ _2"></span>关<span class="_ _6"></span>系<span class="_ _2"></span>改</div><div class="t m2 xd h9 yd ff1 fs6 fc0 sc0 ls0 ws0">变<span class="_ _2"></span>输<span class="_ _2"></span>入<span class="_ _2"></span>信<span class="_ _2"></span>号<span class="_ _2"></span>所<span class="_ _2"></span>含<span class="_ _2"></span>频<span class="_ _2"></span>率<span class="_ _2"></span>成<span class="_ _2"></span>分<span class="_ _2"></span>的<span class="_ _2"></span>比<span class="_ _2"></span>例<span class="_ _2"></span>或<span class="_ _2"></span>者<span class="_ _2"></span>去<span class="_ _2"></span>除<span class="_ _2"></span>某<span class="_ _2"></span>些<span class="_ _2"></span>频<span class="_ _2"></span>率<span class="_ _2"></span>成<span class="_ _2"></span>分<span class="_ _2"></span>。<span class="_ _8"></span>数<span class="_ _2"></span>字</div><div class="t m2 xd h9 ye ff1 fs6 fc0 sc0 ls0 ws0">滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>的<span class="_ _2"></span>信<span class="_ _2"></span>号<span class="_ _2"></span>形<span class="_ _2"></span>式<span class="_ _2"></span>和<span class="_ _2"></span>实<span class="_ _2"></span>现<span class="_ _2"></span>方<span class="_ _2"></span>法<span class="_ _6"></span>与<span class="_ _2"></span>模<span class="_ _2"></span>拟<span class="_ _6"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _6"></span>是<span class="_ _2"></span>不<span class="_ _2"></span>同<span class="_ _6"></span>的</div><div class="t m2 x10 h9 yf ff2 fs6 fc0 sc0 ls0 ws0">,<span class="_ _7"> </span><span class="ff1">它<span class="_ _2"></span>可<span class="_ _2"></span>以</span></div><div class="t m2 xd h9 y10 ff1 fs6 fc0 sc0 ls0 ws0">通<span class="_ _2"></span>过<span class="_ _2"></span>软<span class="_ _2"></span>件<span class="_ _2"></span>和<span class="_ _2"></span>硬<span class="_ _2"></span>件<span class="_ _2"></span>两<span class="_ _2"></span>种<span class="_ _2"></span>方<span class="_ _2"></span>法<span class="_ _2"></span>实<span class="_ _2"></span>现</div><div class="t m2 x11 h9 y11 ff2 fs6 fc0 sc0 ls0 ws0">,<span class="_ _7"> </span><span class="ff1">一<span class="_ _2"></span>个<span class="_ _2"></span>性<span class="_ _2"></span>能<span class="_ _2"></span>优<span class="_ _6"></span>良<span class="_ _2"></span>的<span class="_ _2"></span>数<span class="_ _6"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _6"></span>器<span class="_ _2"></span>与</span></div><div class="t m2 xd h9 y12 ff1 fs6 fc0 sc0 ls0 ws0">软<span class="_ _2"></span>件<span class="_ _2"></span>实<span class="_ _2"></span>现<span class="_ _2"></span>和<span class="_ _2"></span>硬<span class="_ _2"></span>件<span class="_ _2"></span>实<span class="_ _2"></span>现<span class="_ _2"></span>都<span class="_ _2"></span>有<span class="_ _2"></span>密<span class="_ _2"></span>切<span class="_ _2"></span>的<span class="_ _2"></span>联<span class="_ _2"></span>系<span class="_ _2"></span>。<span class="_ _8"></span>数<span class="_ _2"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>从<span class="_ _2"></span>单<span class="_ _2"></span>位<span class="_ _2"></span>脉<span class="_ _2"></span>冲</div><div class="t m2 xd h9 y13 ff1 fs6 fc0 sc0 ls0 ws0">响<span class="_ _2"></span>应<span class="_ _6"></span>分<span class="_ _6"></span>类<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>可<span class="_ _6"></span>以<span class="_ _6"></span>分<span class="_ _6"></span>为<span class="_ _6"></span>无<span class="_ _6"></span>限<span class="_ _6"></span>脉<span class="_ _6"></span>冲<span class="_ _6"></span>响<span class="_ _9"></span>应<span class="_ _8"></span><span class="ff2">(</span></div><div class="t m2 x12 ha y14 ff2 fs7 fc0 sc0 ls0 ws0">I<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 x13 h9 y15 ff2 fs6 fc0 sc0 ls0 ws0">)<span class="_ _b"> </span><span class="ff1">滤<span class="_ _6"></span>波<span class="_ _6"></span>器<span class="_ _6"></span>和<span class="_ _6"></span>有<span class="_ _6"></span>限<span class="_ _6"></span>脉<span class="_ _6"></span>冲<span class="_ _6"></span>响</span></div><div class="t m2 xd h9 y16 ff1 fs6 fc0 sc0 ls0 ws0">应</div><div class="t m2 x14 h9 y17 ff2 fs6 fc0 sc0 ls0 ws0">(</div><div class="t m2 x15 ha y18 ff2 fs7 fc0 sc0 ls0 ws0">F<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 x16 h9 y19 ff2 fs6 fc0 sc0 ls0 ws0">)<span class="_ _7"> </span><span class="ff1">滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>。</span></div><div class="t m2 x17 ha y18 ff2 fs7 fc0 sc0 ls0 ws0">I<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 x18 h9 y19 ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>都<span class="_ _a"></span>是<span class="_ _2"></span>递<span class="_ _2"></span>归<span class="_ _2"></span>型<span class="_ _2"></span>的<span class="_ _6"></span><span class="ff2">,<span class="_ _c"> </span></span>其<span class="_ _2"></span>单<span class="_ _2"></span>位<span class="_ _2"></span>取<span class="_ _2"></span>样<span class="_ _2"></span>响</div><div class="t m2 xd h9 y1a ff1 fs6 fc0 sc0 ls0 ws0">应<span class="_ _2"></span>是<span class="_ _6"></span>无<span class="_ _6"></span>限<span class="_ _2"></span>长<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>系<span class="_ _2"></span>统<span class="_ _6"></span>函<span class="_ _6"></span>数</div><div class="t m2 x19 ha y1b ff2 fs7 fc0 sc0 ls0 ws0">H(<span class="_ _5"></span>z<span class="_ _0"></span>)</div><div class="t m2 x1a h9 y1c ff1 fs6 fc0 sc0 ls0 ws0">在<span class="_ _6"></span>有<span class="_ _6"></span>限</div><div class="t m2 x1b ha y1b ff2 fs7 fc0 sc0 ls0 ws0">Z</div><div class="t m2 x1c h9 y1c ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _6"></span>面<span class="_ _6"></span>上<span class="_ _6"></span>有<span class="_ _6"></span>极<span class="_ _6"></span>点<span class="_ _6"></span>存<span class="_ _6"></span>在<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>结<span class="_ _6"></span>构</div><div class="t m2 xd h9 y1d ff1 fs6 fc0 sc0 ls0 ws0">上<span class="_ _2"></span>存<span class="_ _2"></span>在<span class="_ _2"></span>着<span class="_ _2"></span>输<span class="_ _2"></span>出<span class="_ _a"></span>到<span class="_ _2"></span>输<span class="_ _2"></span>入<span class="_ _2"></span>的<span class="_ _2"></span>反<span class="_ _2"></span>馈<span class="_ _2"></span>网<span class="_ _2"></span>络<span class="_ _2"></span>。<span class="_ _d"></span>一<span class="_ _2"></span>个</div><div class="t m2 x1d ha y1e ff2 fs7 fc0 sc0 ls0 ws0">n</div><div class="t m2 x1e h9 y1f ff1 fs6 fc0 sc0 ls0 ws0">阶</div><div class="t m2 x1f ha y1e ff2 fs7 fc0 sc0 ls0 ws0">I<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 x20 h9 y1f ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>的</div><div class="t m2 xd h9 y20 ff1 fs6 fc0 sc0 ls0 ws0">递<span class="_ _2"></span>归<span class="_ _2"></span>型<span class="_ _2"></span>差<span class="_ _2"></span>分<span class="_ _2"></span>方<span class="_ _a"></span>程<span class="_ _2"></span>为</div><div class="t m2 x21 h9 y21 ff2 fs6 fc0 sc0 ls0 ws0">:</div><div class="t m2 x17 ha y22 ff2 fs7 fc0 sc0 ls0 ws0">y<span class="_ _5"></span>(<span class="_ _5"></span>n)<span class="_ _5"></span>=</div><div class="t m2 x19 hb y23 ff2 fs8 fc0 sc0 ls0 ws0">M</div><div class="t m2 x22 hb y24 ff2 fs8 fc0 sc0 ls0 ws0">i<span class="_ _7"> </span>=<span class="_ _c"> </span>0</div><div class="t m2 x22 hc y25 ff3 fs9 fc0 sc0 ls0 ws0">!</div><div class="t m2 x23 ha y22 ff2 fs7 fc0 sc0 ls0 ws0">b</div><div class="t m2 x24 hb y26 ff2 fs8 fc0 sc0 ls0 ws0">i</div><div class="t m2 x25 ha y22 ff2 fs7 fc0 sc0 ls0 ws0">x</div><div class="t m2 x26 hb y26 ff2 fs8 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>n<span class="_ _a"></span>-<span class="_ _6"> </span>i)</div><div class="t m2 x27 ha y22 ff2 fs7 fc0 sc0 ls0 ws0">+</div><div class="t m2 x28 hb y23 ff2 fs8 fc0 sc0 ls0 ws0">N</div><div class="t m2 x29 hb y24 ff2 fs8 fc0 sc0 ls0 ws0">i<span class="_ _7"> </span>=<span class="_ _c"> </span>1</div><div class="t m2 x29 hc y25 ff3 fs9 fc0 sc0 ls0 ws0">!</div><div class="t m2 x2a ha y22 ff2 fs7 fc0 sc0 ls0 ws0">a</div><div class="t m2 x2b hb y26 ff2 fs8 fc0 sc0 ls0 ws0">i</div><div class="t m2 x2c ha y22 ff2 fs7 fc0 sc0 ls0 ws0">y</div><div class="t m2 x2d hb y26 ff2 fs8 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>n<span class="_ _a"></span>-<span class="_ _6"> </span>i)</div><div class="t m2 xd h7 y27 ff2 fs4 fc0 sc0 ls0 ws0">2<span class="_ _e"> </span>IIR</div><div class="t m2 x2e h8 y28 ff1 fs5 fc0 sc0 ls0 ws0">数<span class="_ _a"></span>字<span class="_ _2"></span>滤<span class="_ _a"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>的<span class="_ _a"></span>设<span class="_ _2"></span>计<span class="_ _2"></span>思<span class="_ _a"></span>想</div><div class="t m2 xf h9 y29 ff1 fs6 fc0 sc0 ls0 ws0">理<span class="_ _2"></span>想<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>的<span class="_ _a"></span>幅<span class="_ _2"></span>频<span class="_ _2"></span>响<span class="_ _6"></span>应<span class="_ _2"></span>在<span class="_ _6"></span>其<span class="_ _2"></span>通<span class="_ _2"></span>频<span class="_ _6"></span>带<span class="_ _2"></span>内<span class="_ _2"></span>是<span class="_ _6"></span>一<span class="_ _2"></span>个<span class="_ _2"></span>常<span class="_ _6"></span>数<span class="_ _2"></span><span class="ff2">,<span class="_ _7"> </span></span>相<span class="_ _2"></span>位<span class="_ _2"></span>频</div><div class="t m2 xd h9 y2a ff1 fs6 fc0 sc0 ls0 ws0">率<span class="_ _2"></span>响<span class="_ _2"></span>应<span class="_ _2"></span>为<span class="_ _2"></span>零<span class="_ _2"></span>或<span class="_ _a"></span>者<span class="_ _2"></span>是<span class="_ _2"></span>频<span class="_ _2"></span>率<span class="_ _2"></span>的<span class="_ _6"></span>线<span class="_ _2"></span>性<span class="_ _6"></span>函<span class="_ _2"></span>数<span class="_ _2"></span><span class="ff2">,<span class="_ _7"> </span></span>但<span class="_ _2"></span>是<span class="_ _2"></span>理<span class="_ _6"></span>想<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _6"></span>器<span class="_ _2"></span>是<span class="_ _2"></span>一<span class="_ _6"></span>个<span class="_ _2"></span>无</div><div class="t m2 xd h9 y2b ff1 fs6 fc0 sc0 ls0 ws0">法<span class="_ _2"></span>实<span class="_ _2"></span>现<span class="_ _2"></span>的<span class="_ _2"></span>非<span class="_ _2"></span>因<span class="_ _a"></span>果<span class="_ _2"></span>系<span class="_ _2"></span>统<span class="_ _6"></span><span class="ff2">,<span class="_ _c"> </span></span>实<span class="_ _2"></span>际<span class="_ _2"></span>上<span class="_ _6"></span>要<span class="_ _2"></span>同<span class="_ _2"></span>时<span class="_ _6"></span>得<span class="_ _2"></span>到<span class="_ _2"></span>理<span class="_ _6"></span>想<span class="_ _2"></span>的<span class="_ _2"></span>幅<span class="_ _6"></span>频<span class="_ _2"></span>特<span class="_ _6"></span>性<span class="_ _2"></span>和<span class="_ _2"></span>相</div><div class="t m2 xd h9 y2c ff1 fs6 fc0 sc0 ls0 ws0">频<span class="_ _2"></span>特<span class="_ _2"></span>性<span class="_ _2"></span>是<span class="_ _2"></span>不<span class="_ _2"></span>可<span class="_ _a"></span>能<span class="_ _2"></span>的<span class="_ _2"></span>。<span class="_ _f"></span>因<span class="_ _2"></span>此</div><div class="t m2 x2f h9 y2d ff2 fs6 fc0 sc0 ls0 ws0">,<span class="_ _c"> </span><span class="ff1">在<span class="_ _2"></span>工<span class="_ _2"></span>程<span class="_ _2"></span>上<span class="_ _2"></span>总<span class="_ _2"></span>是<span class="_ _2"></span>采<span class="_ _2"></span>用<span class="_ _2"></span>某<span class="_ _a"></span>种<span class="_ _2"></span>逼<span class="_ _2"></span>近<span class="_ _2"></span>技<span class="_ _2"></span>术<span class="_ _6"></span></span>,<span class="_ _c"> </span><span class="ff1">在</span></div><div class="t m2 xd h9 y2e ff1 fs6 fc0 sc0 ls0 ws0">一<span class="_ _2"></span>个<span class="_ _6"></span>容<span class="_ _6"></span>差<span class="_ _6"></span>条<span class="_ _6"></span>件<span class="_ _6"></span>下<span class="_ _6"></span>去<span class="_ _6"></span>逼<span class="_ _6"></span>近<span class="_ _6"></span>理<span class="_ _6"></span>想<span class="_ _6"></span>情<span class="_ _6"></span>况<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>对<span class="_ _6"></span>于<span class="_ _6"></span>无<span class="_ _6"></span>限<span class="_ _6"></span>冲<span class="_ _6"></span>激<span class="_ _9"></span>响<span class="_ _6"></span>应<span class="_ _8"></span><span class="ff2">(</span></div><div class="t m2 x30 ha y2f ff2 fs7 fc0 sc0 ls0 ws0">I<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 x31 h9 y30 ff2 fs6 fc0 sc0 ls0 ws0">)<span class="_ _b"> </span><span class="ff1">系</span></div><div class="t m2 xd h9 y31 ff1 fs6 fc0 sc0 ls0 ws0">统<span class="_ _2"></span><span class="ff2">,<span class="_ _c"> </span></span>我<span class="_ _2"></span>们<span class="_ _2"></span>总<span class="_ _2"></span>希<span class="_ _2"></span>望<span class="_ _2"></span>设<span class="_ _2"></span>计<span class="_ _2"></span>一<span class="_ _2"></span>个<span class="_ _2"></span>可<span class="_ _2"></span>以<span class="_ _6"></span>用<span class="_ _2"></span>有<span class="_ _2"></span>理<span class="_ _6"></span>分<span class="_ _2"></span>式<span class="_ _2"></span>表<span class="_ _6"></span>示<span class="_ _2"></span>的<span class="_ _2"></span>系<span class="_ _6"></span>统<span class="_ _2"></span>函<span class="_ _2"></span>数<span class="_ _6"></span>去<span class="_ _2"></span>逼</div><div class="t m2 xd h9 y32 ff1 fs6 fc0 sc0 ls0 ws0">近<span class="_ _2"></span>要<span class="_ _2"></span>求<span class="_ _2"></span>的<span class="_ _2"></span>频<span class="_ _2"></span>率<span class="_ _a"></span>响<span class="_ _2"></span>应<span class="_ _2"></span>。</div><div class="t m2 xf ha y33 ff2 fs7 fc0 sc0 ls0 ws0">I<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 x32 h9 y34 ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>的<span class="_ _a"></span>设<span class="_ _2"></span>计<span class="_ _2"></span>通<span class="_ _2"></span>常<span class="_ _2"></span>有<span class="_ _2"></span>两<span class="_ _2"></span>种<span class="_ _2"></span>方<span class="_ _2"></span>法<span class="_ _6"></span><span class="ff2">,<span class="_ _10"> </span></span>一<span class="_ _2"></span>是<span class="_ _2"></span>直<span class="_ _2"></span>接<span class="_ _2"></span>在<span class="_ _2"></span>频<span class="_ _a"></span>域</div><div class="t m2 xd h9 y35 ff1 fs6 fc0 sc0 ls0 ws0">或<span class="_ _2"></span>时<span class="_ _6"></span>域<span class="_ _6"></span>中<span class="_ _2"></span>进<span class="_ _6"></span>行<span class="_ _6"></span>设<span class="_ _6"></span>计</div><div class="t m2 x7 h9 y36 ff2 fs6 fc0 sc0 ls0 ws0">,<span class="_ _c"> </span><span class="ff1">由<span class="_ _6"></span>于<span class="_ _6"></span>要<span class="_ _2"></span>解<span class="_ _6"></span>联<span class="_ _6"></span>立<span class="_ _6"></span>方<span class="_ _2"></span>程<span class="_ _6"></span></span>,<span class="_ _7"> </span><span class="ff1">所<span class="_ _6"></span>以<span class="_ _6"></span>在<span class="_ _6"></span>设<span class="_ _6"></span>计<span class="_ _6"></span>中<span class="_ _9"></span>需<span class="_ _6"></span>要<span class="_ _6"></span>计</span></div><div class="t m2 xd h9 y37 ff1 fs6 fc0 sc0 ls0 ws0">算<span class="_ _2"></span>机<span class="_ _2"></span>辅<span class="_ _2"></span>助<span class="_ _2"></span>设<span class="_ _2"></span>计<span class="_ _a"></span>。<span class="_ _5"></span>二是<span class="_ _a"></span>先设<span class="_ _a"></span>计<span class="_ _a"></span>原<span class="_ _a"></span>型模<span class="_ _a"></span>拟<span class="_ _a"></span>滤波<span class="_ _a"></span>器<span class="_ _a"></span><span class="ff2">,<span class="_ _11"> </span></span>得<span class="_ _a"></span>到传<span class="_ _a"></span>输<span class="_ _a"></span>函数<span class="_ _a"></span>式</div><div class="t m2 x33 ha y38 ff2 fs7 fc0 sc0 ls0 ws0">H</div><div class="t m2 x34 hb y39 ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 xd ha y3a ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _12"></span>s<span class="_ _5"></span>)<span class="_ _12"></span>,</div><div class="t m2 x35 h9 y3b ff1 fs6 fc0 sc0 ls0 ws0">然<span class="_ _a"></span>后将</div><div class="t m2 x2e ha y3a ff2 fs7 fc0 sc0 ls0 ws0">H</div><div class="t m2 x36 hb y3c ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x37 ha y3a ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _12"></span>s<span class="_ _5"></span>)</div><div class="t m2 x38 h9 y3b ff1 fs6 fc0 sc0 ls0 ws0">按<span class="_ _a"></span>某种<span class="_ _a"></span>方<span class="_ _a"></span>法转<span class="_ _a"></span>换<span class="_ _a"></span>成数<span class="_ _a"></span>字<span class="_ _a"></span>滤波<span class="_ _a"></span>器<span class="_ _a"></span>的<span class="_ _a"></span>系统<span class="_ _a"></span>函<span class="_ _a"></span>数</div><div class="t m2 x39 ha y3a ff2 fs7 fc0 sc0 ls0 ws0">H<span class="_ _5"></span>(<span class="_ _12"></span>z<span class="_ _5"></span>)</div><div class="t m2 x3a h9 y3b ff1 fs6 fc0 sc0 ls0 ws0">。</div><div class="t m2 xd h7 y3d ff2 fs4 fc0 sc0 ls0 ws0">3<span class="_ _e"> </span>IIR</div><div class="t m2 x2e h8 y3e ff1 fs5 fc0 sc0 ls0 ws0">数<span class="_ _a"></span>字<span class="_ _2"></span>滤<span class="_ _a"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>的<span class="_ _a"></span>设<span class="_ _2"></span>计</div><div class="t m2 xf h9 y3f ff1 fs6 fc0 sc0 ls0 ws0">在<span class="_ _2"></span>工<span class="_ _2"></span>程<span class="_ _2"></span>上<span class="_ _2"></span>经<span class="_ _2"></span>常<span class="_ _a"></span>要<span class="_ _2"></span>设<span class="_ _2"></span>计<span class="_ _6"></span>各<span class="_ _2"></span>种<span class="_ _6"></span>截<span class="_ _2"></span>止<span class="_ _2"></span>频<span class="_ _6"></span>率<span class="_ _2"></span>的<span class="_ _2"></span>滤<span class="_ _6"></span>波<span class="_ _2"></span>器<span class="_ _2"></span><span class="ff2">,<span class="_ _7"> </span></span>通<span class="_ _2"></span>常<span class="_ _2"></span>的<span class="_ _6"></span>做<span class="_ _2"></span>法</div><div class="t m2 xd h9 y40 ff1 fs6 fc0 sc0 ls0 ws0">是<span class="_ _2"></span>先<span class="_ _2"></span>设<span class="_ _2"></span>计<span class="_ _2"></span>一<span class="_ _2"></span>个<span class="_ _a"></span>无<span class="_ _2"></span>限<span class="_ _2"></span>冲<span class="_ _2"></span>击<span class="_ _2"></span>响<span class="_ _6"></span>应<span class="_ _2"></span>低<span class="_ _6"></span>通<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _6"></span>器<span class="_ _2"></span><span class="ff2">,<span class="_ _c"> </span></span>然<span class="_ _6"></span>后<span class="_ _2"></span>利<span class="_ _2"></span>用<span class="_ _6"></span>代<span class="_ _2"></span>数<span class="_ _6"></span>变<span class="_ _2"></span>换<span class="_ _2"></span>推</div><div class="t m2 xd h9 y41 ff1 fs6 fc0 sc0 ls0 ws0">导<span class="_ _2"></span>出<span class="_ _2"></span>各<span class="_ _2"></span>种<span class="_ _2"></span>技<span class="_ _2"></span>术<span class="_ _a"></span>指<span class="_ _2"></span>标<span class="_ _2"></span>的<span class="_ _2"></span>低<span class="_ _2"></span>通<span class="_ _2"></span>、<span class="_ _13"></span>高<span class="_ _2"></span>通<span class="_ _2"></span>、<span class="_ _13"></span>带<span class="_ _a"></span>通<span class="_ _2"></span>和<span class="_ _2"></span>带<span class="_ _2"></span>阻<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>。<span class="_ _8"></span>利<span class="_ _2"></span>用<span class="_ _2"></span>模<span class="_ _2"></span>拟</div><div class="t m2 xd h9 y42 ff1 fs6 fc0 sc0 ls0 ws0">滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>来<span class="_ _2"></span>设<span class="_ _6"></span>计</div><div class="t m2 x3b ha y43 ff2 fs7 fc0 sc0 ls0 ws0">I<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 x21 h9 y44 ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _2"></span>滤<span class="_ _6"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>是<span class="_ _6"></span>经<span class="_ _2"></span>常<span class="_ _2"></span>使<span class="_ _6"></span>用<span class="_ _2"></span>的<span class="_ _2"></span>方<span class="_ _6"></span>法<span class="_ _2"></span><span class="ff2">,<span class="_ _7"> </span></span>因<span class="_ _2"></span>为<span class="_ _2"></span>模<span class="_ _2"></span>拟<span class="_ _6"></span>滤</div><div class="t m2 xd h9 y45 ff1 fs6 fc0 sc0 ls0 ws0">波<span class="_ _2"></span>器<span class="_ _6"></span>的<span class="_ _6"></span>理<span class="_ _2"></span>论<span class="_ _6"></span>和<span class="_ _6"></span>设<span class="_ _6"></span>计<span class="_ _2"></span>方<span class="_ _6"></span>法<span class="_ _6"></span>都<span class="_ _2"></span>已<span class="_ _6"></span>发<span class="_ _6"></span>展<span class="_ _6"></span>得<span class="_ _6"></span>很<span class="_ _6"></span>成<span class="_ _6"></span>熟<span class="_ _6"></span>有<span class="_ _6"></span>很<span class="_ _6"></span>多<span class="_ _6"></span>典<span class="_ _6"></span>型<span class="_ _6"></span>的<span class="_ _6"></span>模<span class="_ _6"></span>拟</div><div class="t m2 xd h9 y46 ff1 fs6 fc0 sc0 ls0 ws0">滤<span class="_ _6"></span>波<span class="_ _9"> </span>器<span class="_ _9"> </span>可<span class="_ _9"></span>供<span class="_ _9"></span>参<span class="_ _6"></span>考</div><div class="t m2 x6 h9 y47 ff2 fs6 fc0 sc0 ls0 ws0">,<span class="_ _14"> </span><span class="ff1">如</span></div><div class="t m2 x3c ha y48 ff2 fs7 fc0 sc0 ls0 ws0">Ch<span class="_ _a"></span>e<span class="_ _a"></span>b<span class="_ _a"></span>ys<span class="_ _a"></span>h<span class="_ _a"></span>e<span class="_ _a"></span>v</div><div class="t m2 x3d h9 y49 ff1 fs6 fc0 sc0 ls0 ws0">滤<span class="_ _6"></span>波<span class="_ _9"> </span>器<span class="_ _9"> </span>、</div><div class="t m2 x3e ha y48 ff2 fs7 fc0 sc0 ls0 ws0">Be<span class="_ _a"></span>s<span class="_ _a"></span>s<span class="_ _a"></span>e<span class="_ _a"></span>l</div><div class="t m2 x3f h9 y49 ff1 fs6 fc0 sc0 ls0 ws0">滤<span class="_ _9"></span>波<span class="_ _9"> </span>器<span class="_ _9"> </span>、</div><div class="t m2 x40 ha y48 ff2 fs7 fc0 sc0 ls0 ws0">E<span class="_ _a"></span>l<span class="_ _a"></span>-</div><div class="t m2 xd ha y4a ff2 fs7 fc0 sc0 ls0 ws0">l<span class="_ _a"></span>ip<span class="_ _2"></span>s<span class="_ _a"></span>e</div><div class="t m2 x41 h9 y4b ff1 fs6 fc0 sc0 ls0 ws0">滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _6"></span>等<span class="_ _2"></span><span class="ff2">,<span class="_ _10"> </span></span>这<span class="_ _6"></span>些<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _6"></span>器<span class="_ _2"></span>都<span class="_ _2"></span>有<span class="_ _6"></span>严<span class="_ _2"></span>格<span class="_ _6"></span>的<span class="_ _6"></span>设<span class="_ _2"></span>计<span class="_ _6"></span>公<span class="_ _6"></span>式<span class="_ _2"></span>和<span class="_ _6"></span>各<span class="_ _6"></span>种<span class="_ _6"></span>设<span class="_ _2"></span>计</div><div class="t m2 xd h9 y4c ff1 fs6 fc0 sc0 ls0 ws0">资<span class="_ _2"></span>料<span class="_ _2"></span>可<span class="_ _2"></span>供<span class="_ _2"></span>参<span class="_ _2"></span>考<span class="_ _a"></span>。<span class="_ _f"></span>按<span class="_ _2"></span>照<span class="_ _2"></span>设<span class="_ _2"></span>计<span class="_ _2"></span>要<span class="_ _2"></span>求<span class="_ _2"></span>得<span class="_ _2"></span>到<span class="_ _a"></span>模<span class="_ _2"></span>拟<span class="_ _2"></span>低<span class="_ _2"></span>通<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>的<span class="_ _2"></span>传<span class="_ _2"></span>输<span class="_ _2"></span>函<span class="_ _2"></span>数</div><div class="t m2 xd ha y4d ff2 fs7 fc0 sc0 ls0 ws0">H</div><div class="t m2 x42 hb y4e ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x35 ha y4d ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>s)</div><div class="t m2 x43 h9 y4f ff1 fs6 fc0 sc0 ls0 ws0">后<span class="_ _2"></span><span class="ff2">,<span class="_ _c"> </span></span>再<span class="_ _2"></span>将<span class="_ _2"></span>传<span class="_ _2"></span>输<span class="_ _2"></span>函<span class="_ _2"></span>数</div><div class="t m2 x44 ha y4d ff2 fs7 fc0 sc0 ls0 ws0">H</div><div class="t m2 x45 hb y4e ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x46 ha y4d ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>s)</div><div class="t m2 x47 h9 y4f ff1 fs6 fc0 sc0 ls0 ws0">转<span class="_ _2"></span>换<span class="_ _2"></span>成<span class="_ _2"></span>数<span class="_ _6"></span>字<span class="_ _2"></span>低<span class="_ _2"></span>通<span class="_ _6"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _6"></span>的<span class="_ _2"></span>系<span class="_ _2"></span>统<span class="_ _6"></span>函<span class="_ _2"></span>数</div><div class="t m2 xd ha y50 ff2 fs7 fc0 sc0 ls0 ws0">H</div><div class="t m2 x42 hb y51 ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x35 ha y50 ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>z<span class="_ _5"></span>)</div><div class="t m2 x43 h9 y52 ff2 fs6 fc0 sc0 ls0 ws0">,<span class="_ _c"> </span><span class="ff1">将</span></div><div class="t m2 x32 ha y50 ff2 fs7 fc0 sc0 ls0 ws0">H</div><div class="t m2 x48 hb y51 ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x49 ha y50 ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>s)</div><div class="t m2 x4a h9 y52 ff1 fs6 fc0 sc0 ls0 ws0">转<span class="_ _2"></span>换<span class="_ _6"></span>成</div><div class="t m2 x4b ha y50 ff2 fs7 fc0 sc0 ls0 ws0">H</div><div class="t m2 x44 hb y51 ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x19 ha y50 ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>z<span class="_ _5"></span>)</div><div class="t m2 x4c h9 y52 ff1 fs6 fc0 sc0 ls0 ws0">的<span class="_ _2"></span>方<span class="_ _6"></span>法<span class="_ _6"></span>很<span class="_ _2"></span>多<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>但<span class="_ _2"></span>在<span class="_ _6"></span>工<span class="_ _6"></span>程<span class="_ _2"></span>上<span class="_ _6"></span>用<span class="_ _6"></span>得<span class="_ _6"></span>比<span class="_ _2"></span>较<span class="_ _6"></span>多</div><div class="t m2 x4d h9 y53 ff1 fs6 fc0 sc0 ls0 ws0">的<span class="_ _2"></span>是<span class="_ _2"></span>脉<span class="_ _2"></span>冲<span class="_ _2"></span>响<span class="_ _2"></span>应<span class="_ _a"></span>不<span class="_ _2"></span>变<span class="_ _2"></span>法<span class="_ _2"></span>和<span class="_ _2"></span>双<span class="_ _2"></span>线<span class="_ _2"></span>性<span class="_ _2"></span>变<span class="_ _2"></span>换<span class="_ _2"></span>法<span class="_ _2"></span>。</div><div class="t m2 x4d ha y54 ff2 fs7 fc0 sc0 ls0 ws0">3<span class="_ _a"></span>.1</div><div class="t m2 x4e h9 y55 ff1 fs6 fc0 sc0 ls0 ws0">用<span class="_ _2"></span>脉<span class="_ _2"></span>冲<span class="_ _2"></span>响<span class="_ _2"></span>应<span class="_ _2"></span>不<span class="_ _a"></span>变<span class="_ _2"></span>法<span class="_ _2"></span>设<span class="_ _2"></span>计</div><div class="t m2 x4f ha y54 ff2 fs7 fc0 sc0 ls0 ws0">IIR</div><div class="t m2 x50 h9 y55 ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _2"></span>低<span class="_ _2"></span>通<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _a"></span>器</div><div class="t m2 x51 h9 y56 ff1 fs6 fc0 sc0 ls0 ws0">脉<span class="_ _2"></span>冲<span class="_ _2"></span>响<span class="_ _2"></span>应<span class="_ _2"></span>不<span class="_ _2"></span>变<span class="_ _a"></span>法<span class="_ _2"></span>是<span class="_ _6"></span>一<span class="_ _2"></span>种<span class="_ _6"></span>时<span class="_ _2"></span>域<span class="_ _2"></span>上<span class="_ _6"></span>的<span class="_ _2"></span>转<span class="_ _2"></span>换<span class="_ _6"></span>方<span class="_ _2"></span>法<span class="_ _6"></span><span class="ff2">,<span class="_ _c"> </span></span>这<span class="_ _2"></span>种<span class="_ _6"></span>方<span class="_ _2"></span>法<span class="_ _2"></span>适<span class="_ _6"></span>用</div><div class="t m2 x4d h9 y57 ff1 fs6 fc0 sc0 ls0 ws0">于<span class="_ _2"></span>系<span class="_ _6"></span>统<span class="_ _6"></span>函<span class="_ _2"></span>数<span class="_ _6"></span>可<span class="_ _6"></span>以<span class="_ _6"></span>用<span class="_ _2"></span>部<span class="_ _6"></span>分<span class="_ _6"></span>分<span class="_ _2"></span>式<span class="_ _6"></span>分<span class="_ _6"></span>解<span class="_ _6"></span>成<span class="_ _6"></span>单<span class="_ _6"></span>阶<span class="_ _6"></span>极<span class="_ _6"></span>点<span class="_ _6"></span>和<span class="_ _9"></span>滤<span class="_ _6"></span>波<span class="_ _6"></span>器<span class="_ _6"></span>是<span class="_ _6"></span>一<span class="_ _6"></span>个</div><div class="t m2 x4d h9 y58 ff1 fs6 fc0 sc0 ls0 ws0">带<span class="_ _2"></span>限<span class="_ _2"></span>系<span class="_ _6"></span>统<span class="_ _2"></span>的<span class="_ _2"></span>情<span class="_ _6"></span>况<span class="_ _2"></span><span class="ff2">,<span class="_ _c"> </span></span>它<span class="_ _6"></span>使<span class="_ _2"></span>数<span class="_ _2"></span>字<span class="_ _6"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _6"></span>的<span class="_ _6"></span>冲<span class="_ _6"></span>击<span class="_ _2"></span>响<span class="_ _6"></span>应</div><div class="t m2 x52 ha y59 ff2 fs7 fc0 sc0 ls0 ws0">h(<span class="_ _5"></span>n)</div><div class="t m2 x53 h9 y5a ff1 fs6 fc0 sc0 ls0 ws0">等<span class="_ _2"></span>于<span class="_ _6"></span>模<span class="_ _6"></span>拟<span class="_ _2"></span>滤</div><div class="t m2 x4d h9 y5b ff1 fs6 fc0 sc0 ls0 ws0">波<span class="_ _2"></span>器<span class="_ _2"></span>的<span class="_ _2"></span>单<span class="_ _2"></span>位<span class="_ _2"></span>冲<span class="_ _a"></span>击<span class="_ _2"></span>响<span class="_ _2"></span>应</div><div class="t m2 x54 ha y5c ff2 fs7 fc0 sc0 ls0 ws0">h</div><div class="t m2 x55 hb y5d ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x56 ha y5c ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>t)</div><div class="t m2 x57 h9 y5e ff1 fs6 fc0 sc0 ls0 ws0">的<span class="_ _2"></span>采<span class="_ _2"></span>样<span class="_ _2"></span>值<span class="_ _2"></span><span class="ff2">,<span class="_ _c"> </span></span>即<span class="_ _2"></span><span class="ff2">:</span></div><div class="t m2 x58 ha y5f ff2 fs7 fc0 sc0 ls0 ws0">h(<span class="_ _5"></span>n)<span class="_ _5"></span>=<span class="_ _11"> </span>h<span class="_ _a"></span>a(<span class="_ _5"></span>t)<span class="_ _12"></span><span class="ff1">│</span></div><div class="t m2 x59 hb y60 ff2 fs8 fc0 sc0 ls0 ws0">t=<span class="_ _a"></span>nT</div><div class="t m2 x5a ha y5f ff2 fs7 fc0 sc0 ls0 ws0">=<span class="_ _11"> </span>h</div><div class="t m2 x5b hb y60 ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x5c ha y5f ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>n<span class="_ _a"></span>T<span class="_ _5"></span>)</div><div class="t m2 x5d h9 y61 ff1 fs6 fc0 sc0 ls0 ws0">描<span class="_ _2"></span>述<span class="_ _2"></span>数<span class="_ _2"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _a"></span>器<span class="_ _2"></span>特<span class="_ _2"></span>性<span class="_ _2"></span>的<span class="_ _2"></span>系<span class="_ _2"></span>统<span class="_ _2"></span>函<span class="_ _2"></span>数</div><div class="t m2 x5e ha y62 ff2 fs7 fc0 sc0 ls0 ws0">H(<span class="_ _5"></span>Z<span class="_ _5"></span>)</div><div class="t m2 x5f h9 y61 ff1 fs6 fc0 sc0 ls0 ws0">变<span class="_ _2"></span>成<span class="_ _2"></span><span class="ff2">:</span></div><div class="t m2 x58 ha y63 ff2 fs7 fc0 sc0 ls0 ws0">H(<span class="_ _5"></span>Z<span class="_ _5"></span>)<span class="_ _5"></span>=<span class="ff1">ξ</span>[<span class="_ _5"></span>h(<span class="_ _5"></span>n)<span class="_ _5"></span>]<span class="_ _5"></span>=<span class="_ _11"> </span><span class="ff1">ξ</span>[<span class="_ _5"></span>h</div><div class="t m2 x60 hb y64 ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x5e ha y63 ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>t)<span class="_ _12"></span><span class="ff1">│</span></div><div class="t m2 x5f hb y64 ff2 fs8 fc0 sc0 ls0 ws0">t=<span class="_ _a"></span>nT</div><div class="t m2 x61 ha y63 ff2 fs7 fc0 sc0 ls0 ws0">]</div><div class="t m2 x5d h9 y65 ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _6"></span>滤<span class="_ _6"></span>波<span class="_ _2"></span>器<span class="_ _6"></span>系<span class="_ _6"></span>统<span class="_ _6"></span>函<span class="_ _2"></span>数</div><div class="t m2 x62 ha y66 ff2 fs7 fc0 sc0 ls0 ws0">H(<span class="_ _5"></span>Z<span class="_ _5"></span>)</div><div class="t m2 x63 h9 y65 ff1 fs6 fc0 sc0 ls0 ws0">和<span class="_ _2"></span>模<span class="_ _6"></span>拟<span class="_ _6"></span>滤<span class="_ _2"></span>波<span class="_ _6"></span>器<span class="_ _6"></span>系<span class="_ _6"></span>统<span class="_ _2"></span>函<span class="_ _6"></span>数</div><div class="t m2 x64 ha y66 ff2 fs7 fc0 sc0 ls0 ws0">H(<span class="_ _5"></span>s)</div><div class="t m2 x65 h9 y65 ff1 fs6 fc0 sc0 ls0 ws0">之<span class="_ _2"></span>间</div><div class="t m2 x4d h9 y67 ff1 fs6 fc0 sc0 ls0 ws0">的<span class="_ _2"></span>关<span class="_ _2"></span>系<span class="_ _2"></span>为<span class="_ _2"></span><span class="ff2">:</span></div><div class="t m2 x66 ha y68 ff2 fs7 fc0 sc0 ls0 ws0">H(<span class="_ _5"></span>Z<span class="_ _5"></span>)<span class="_ _5"></span>=<span class="ff1">ξ</span>[<span class="_ _5"></span><span class="ff1">ξ</span></div><div class="t m2 x67 hb y69 ff2 fs8 fc0 sc0 ls0 ws0">-<span class="_ _9"> </span>1</div><div class="t m2 x68 ha y68 ff2 fs7 fc0 sc0 ls0 ws0">[<span class="_ _5"></span>H(<span class="_ _5"></span>s)<span class="_ _12"></span><span class="ff1">│</span></div><div class="t m2 x69 hb y6a ff2 fs8 fc0 sc0 ls0 ws0">t=<span class="_ _a"></span>nT</div><div class="t m2 x6a ha y68 ff2 fs7 fc0 sc0 ls0 ws0">]</div><div class="t m2 x51 h9 y6b ff1 fs6 fc0 sc0 ls0 ws0">例<span class="_ _2"></span>如<span class="_ _2"></span><span class="ff2">:<span class="_ _c"> </span></span>一<span class="_ _2"></span>个<span class="_ _2"></span>模<span class="_ _6"></span>拟<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _6"></span>器<span class="_ _2"></span>的<span class="_ _2"></span>系<span class="_ _6"></span>统<span class="_ _2"></span>函<span class="_ _2"></span>数</div><div class="t m2 x6b ha y6c ff2 fs7 fc0 sc0 ls0 ws0">H(<span class="_ _5"></span>s)<span class="_ _5"></span>=<span class="_ _15"> </span>A/(<span class="_ _5"></span>s<span class="_ _a"></span>-<span class="_ _c"> </span>a<span class="_ _0"></span>)<span class="_ _5"></span>,</div><div class="t m2 x6c h9 y6b ff1 fs6 fc0 sc0 ls0 ws0">对</div><div class="t m2 x6d ha y6c ff2 fs7 fc0 sc0 ls0 ws0">H(<span class="_ _5"></span>s)</div><div class="t m2 x6e h9 y6b ff1 fs6 fc0 sc0 ls0 ws0">进</div><div class="t m2 x4d h9 y6d ff1 fs6 fc0 sc0 ls0 ws0">行<span class="_ _2"></span>拉<span class="_ _2"></span>氏<span class="_ _2"></span>反<span class="_ _2"></span>变<span class="_ _2"></span>换<span class="_ _a"></span>后<span class="_ _2"></span>就<span class="_ _2"></span>求<span class="_ _6"></span>得<span class="_ _2"></span>模<span class="_ _6"></span>拟<span class="_ _2"></span>系<span class="_ _2"></span>统<span class="_ _6"></span>的<span class="_ _2"></span>单<span class="_ _2"></span>位<span class="_ _6"></span>冲<span class="_ _2"></span>击<span class="_ _2"></span>响<span class="_ _6"></span>应<span class="_ _2"></span><span class="ff2">,<span class="_ _14"> </span></span>将</div><div class="t m2 x6f ha y6e ff2 fs7 fc0 sc0 ls0 ws0">t<span class="_ _a"></span>=n<span class="_ _2"></span>T</div><div class="t m2 x6e h9 y6f ff1 fs6 fc0 sc0 ls0 ws0">代</div><div class="t m2 x4d h9 y70 ff1 fs6 fc0 sc0 ls0 ws0">入<span class="_ _2"></span>式<span class="_ _2"></span>子<span class="_ _2"></span>就<span class="_ _2"></span>得<span class="_ _2"></span>到<span class="_ _a"></span>其<span class="_ _2"></span>不<span class="_ _2"></span>变<span class="_ _2"></span>的<span class="_ _2"></span>离<span class="_ _2"></span>散<span class="_ _2"></span>系<span class="_ _2"></span>统<span class="_ _2"></span>冲<span class="_ _2"></span>击<span class="_ _2"></span>响<span class="_ _2"></span>应</div><div class="t m2 x70 ha y71 ff2 fs7 fc0 sc0 ls0 ws0">h(<span class="_ _5"></span>n)<span class="_ _5"></span>=A<span class="_ _0"></span>(<span class="_ _5"></span>e</div><div class="t m2 x71 hb y72 ff2 fs8 fc0 sc0 ls0 ws0">aT</div><div class="t m2 x72 ha y71 ff2 fs7 fc0 sc0 ls0 ws0">)</div><div class="t m2 x73 hb y72 ff2 fs8 fc0 sc0 ls0 ws0">n</div><div class="t m2 x74 ha y71 ff2 fs7 fc0 sc0 ls0 ws0">u(<span class="_ _5"></span>n)<span class="_ _5"></span>,</div><div class="t m2 x65 h9 y73 ff1 fs6 fc0 sc0 ls0 ws0">再<span class="_ _2"></span>进</div><div class="t m2 x4d h9 y74 ff1 fs6 fc0 sc0 ls0 ws0">行</div><div class="t m2 x5d ha y75 ff2 fs7 fc0 sc0 ls0 ws0">Z</div><div class="t m2 x51 h9 y76 ff1 fs6 fc0 sc0 ls0 ws0">变<span class="_ _2"></span>换<span class="_ _2"></span>就<span class="_ _2"></span>得<span class="_ _2"></span>到<span class="_ _2"></span><span class="ff2">:</span></div><div class="t m2 x75 ha y77 ff2 fs7 fc0 sc0 ls0 ws0">H(<span class="_ _5"></span>Z<span class="_ _5"></span>)<span class="_ _5"></span>=<span class="ff1">ξ</span>[<span class="_ _5"></span>h(<span class="_ _5"></span>n)<span class="_ _5"></span>]<span class="_ _5"></span>=<span class="_ _11"> </span><span class="ff1">ξ</span>[<span class="_ _5"></span>h<span class="_ _a"></span>a(<span class="_ _5"></span>t)<span class="_ _5"></span><span class="ff1">│</span></div><div class="t m2 x76 hb y78 ff2 fs8 fc0 sc0 ls0 ws0">t=<span class="_ _a"></span>nT</div><div class="t m2 x77 ha y77 ff2 fs7 fc0 sc0 ls0 ws0">]<span class="_ _5"></span>=</div><div class="t m2 x78 ha y79 ff2 fs7 fc0 sc0 ls0 ws0">A</div><div class="t m2 x79 ha y7a ff2 fs7 fc0 sc0 ls0 ws0">1<span class="_ _a"></span>-<span class="_ _c"> </span>e</div><div class="t m2 x7a hb y7b ff2 fs8 fc0 sc0 ls0 ws0">a<span class="_ _a"></span>T</div><div class="t m2 x74 ha y7c ff2 fs7 fc0 sc0 ls0 ws0">Z</div><div class="t m2 x6f hb y7b ff2 fs8 fc0 sc0 ls0 ws0">-<span class="_ _16"> </span>1</div><div class="t m2 x4d ha y7d ff2 fs7 fc0 sc0 ls0 ws0">3<span class="_ _a"></span>.2</div><div class="t m2 x4e h9 y7e ff1 fs6 fc0 sc0 ls0 ws0">用<span class="_ _2"></span>双<span class="_ _2"></span>线<span class="_ _2"></span>性<span class="_ _2"></span>变<span class="_ _2"></span>换<span class="_ _a"></span>法<span class="_ _2"></span>设<span class="_ _2"></span>计</div><div class="t m2 x7b ha y7d ff2 fs7 fc0 sc0 ls0 ws0">IIR</div><div class="t m2 x7c h9 y7e ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _2"></span>低<span class="_ _2"></span>通<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _a"></span>器</div><div class="t m2 x51 h9 y7f ff1 fs6 fc0 sc0 ls0 ws0">由<span class="_ _2"></span>于<span class="_ _2"></span>从</div><div class="t m2 x7d ha y80 ff2 fs7 fc0 sc0 ls0 ws0">S</div><div class="t m2 x7e h9 y81 ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>到</div><div class="t m2 x7f ha y80 ff2 fs7 fc0 sc0 ls0 ws0">Z</div><div class="t m2 x80 h9 y81 ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>的<span class="_ _6"></span>变<span class="_ _6"></span>换<span class="_ _2"></span>式</div><div class="t m2 x81 ha y80 ff2 fs7 fc0 sc0 ls0 ws0">Z=e</div><div class="t m2 x70 hb y82 ff2 fs8 fc0 sc0 ls0 ws0">ST</div><div class="t m2 x77 h9 y81 ff1 fs6 fc0 sc0 ls0 ws0">存<span class="_ _2"></span>在<span class="_ _6"></span>多<span class="_ _6"></span>值<span class="_ _2"></span>对<span class="_ _6"></span>应<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>所</div><div class="t m2 x4d h9 y83 ff1 fs6 fc0 sc0 ls0 ws0">以<span class="_ _2"></span>脉<span class="_ _2"></span>冲<span class="_ _2"></span>响<span class="_ _2"></span>应<span class="_ _2"></span>不<span class="_ _a"></span>变<span class="_ _2"></span>法<span class="_ _2"></span>会<span class="_ _2"></span>导<span class="_ _6"></span>致<span class="_ _2"></span>数<span class="_ _6"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _6"></span>器<span class="_ _2"></span>频<span class="_ _2"></span>率<span class="_ _6"></span>响<span class="_ _2"></span>应<span class="_ _2"></span>出<span class="_ _6"></span>现<span class="_ _2"></span>混<span class="_ _2"></span>叠<span class="_ _6"></span>现<span class="_ _2"></span>象<span class="_ _2"></span>。</div><div class="t m2 x4d h9 y84 ff1 fs6 fc0 sc0 ls0 ws0">双<span class="_ _2"></span>线<span class="_ _2"></span>性<span class="_ _2"></span>变<span class="_ _2"></span>换<span class="_ _2"></span>法<span class="_ _a"></span>克<span class="_ _2"></span>服<span class="_ _2"></span>了<span class="_ _2"></span>混<span class="_ _2"></span>叠<span class="_ _2"></span>现<span class="_ _2"></span>象</div><div class="t m2 x82 h9 y85 ff2 fs6 fc0 sc0 ls0 ws0">,<span class="_ _c"> </span><span class="ff1">并<span class="_ _2"></span>且<span class="_ _6"></span>它<span class="_ _2"></span>与</span></div><div class="t m2 x83 ha y86 ff2 fs7 fc0 sc0 ls0 ws0">Z</div><div class="t m2 x84 h9 y87 ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>之<span class="_ _6"></span>间<span class="_ _2"></span>存<span class="_ _2"></span>在<span class="_ _6"></span>简<span class="_ _2"></span>单</div><div class="t m2 x4d h9 y88 ff1 fs6 fc0 sc0 ls0 ws0">的<span class="_ _2"></span>代<span class="_ _2"></span>数<span class="_ _2"></span>关<span class="_ _2"></span>系<span class="_ _2"></span><span class="ff2">,<span class="_ _c"> </span></span>在<span class="_ _2"></span>工<span class="_ _2"></span>程<span class="_ _2"></span>设<span class="_ _2"></span>计<span class="_ _2"></span>时<span class="_ _2"></span>比<span class="_ _2"></span>脉<span class="_ _2"></span>冲<span class="_ _2"></span>响<span class="_ _2"></span>应<span class="_ _2"></span>不<span class="_ _2"></span>变<span class="_ _2"></span>法<span class="_ _2"></span>直<span class="_ _2"></span>接<span class="_ _2"></span>而<span class="_ _2"></span>简<span class="_ _2"></span>单<span class="_ _a"></span>。</div><div class="t m2 x51 h9 y89 ff1 fs6 fc0 sc0 ls0 ws0">双<span class="_ _2"></span>线<span class="_ _2"></span>性<span class="_ _2"></span>变<span class="_ _2"></span>换<span class="_ _2"></span>法<span class="_ _a"></span>需<span class="_ _2"></span>要<span class="_ _6"></span>通<span class="_ _2"></span>过<span class="_ _6"></span>两<span class="_ _2"></span>次<span class="_ _2"></span>映<span class="_ _6"></span>射<span class="_ _2"></span>来<span class="_ _2"></span>实<span class="_ _6"></span>现<span class="_ _2"></span><span class="ff2">,<span class="_ _7"> </span></span>第<span class="_ _2"></span>一<span class="_ _2"></span>次<span class="_ _6"></span>映<span class="_ _2"></span>射<span class="_ _2"></span>先<span class="_ _6"></span>将</div><div class="t m2 x4d ha y8a ff2 fs7 fc0 sc0 ls0 ws0">S</div><div class="t m2 x85 h9 y8b ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>压<span class="_ _2"></span>缩<span class="_ _2"></span>到</div><div class="t m2 x86 ha y8a ff2 fs7 fc0 sc0 ls0 ws0">S</div><div class="t m2 x87 hb y8c ff2 fs8 fc0 sc0 ls0 ws0">1</div><div class="t m2 x88 h9 y8b ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>的<span class="_ _2"></span>一<span class="_ _2"></span>条<span class="_ _2"></span>带<span class="_ _a"></span>域<span class="_ _6"></span>内<span class="_ _8"></span><span class="ff2">(<span class="_ _15"> </span>)<span class="_ _7"> </span>,<span class="_ _c"> </span><span class="ff1">然<span class="_ _2"></span>后<span class="_ _6"></span>通<span class="_ _2"></span>过<span class="_ _2"></span>第<span class="_ _6"></span>二<span class="_ _2"></span>次<span class="_ _2"></span>映<span class="_ _6"></span>射<span class="_ _2"></span>将</span></span></div><div class="t m2 x89 h9 y8d ff2 fs6 fc0 sc0 ls0 ws0">(<span class="_ _15"> </span>)<span class="_ _7"> </span><span class="ff1">带<span class="_ _2"></span>域<span class="_ _2"></span>映<span class="_ _2"></span>射<span class="_ _2"></span>到</span></div><div class="t m2 x8a ha y8e ff2 fs7 fc0 sc0 ls0 ws0">Z</div><div class="t m2 x88 h9 y8f ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>上<span class="_ _2"></span><span class="ff2">,<span class="_ _c"> </span></span>这<span class="_ _2"></span>样<span class="_ _2"></span>就<span class="_ _2"></span>能<span class="_ _2"></span>保<span class="_ _2"></span>证</div><div class="t m2 x6a ha y8e ff2 fs7 fc0 sc0 ls0 ws0">S</div><div class="t m2 x8b h9 y8f ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>和</div><div class="t m2 x8c ha y8e ff2 fs7 fc0 sc0 ls0 ws0">Z</div><div class="t m2 x53 h9 y8f ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>之<span class="_ _6"></span>间<span class="_ _2"></span>建</div><div class="t m2 x4d h9 y90 ff1 fs6 fc0 sc0 ls0 ws0">立<span class="_ _2"></span>单<span class="_ _2"></span>值<span class="_ _2"></span>对<span class="_ _2"></span>应<span class="_ _2"></span>关<span class="_ _a"></span>系</div><div class="t m2 x88 h9 y91 ff2 fs6 fc0 sc0 ls0 ws0">,<span class="_ _c"> </span><span class="ff1">从<span class="_ _2"></span>而<span class="_ _2"></span>消<span class="_ _2"></span>除<span class="_ _2"></span>了<span class="_ _2"></span>混<span class="_ _2"></span>叠<span class="_ _2"></span>现<span class="_ _2"></span>象<span class="_ _a"></span>。</span></div><div class="t m2 x51 h9 y92 ff1 fs6 fc0 sc0 ls0 ws0">将</div><div class="t m2 x8d ha y93 ff2 fs7 fc0 sc0 ls0 ws0">S</div><div class="t m2 x8e h9 y94 ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>压<span class="_ _2"></span>缩<span class="_ _2"></span>到</div><div class="t m2 x54 ha y93 ff2 fs7 fc0 sc0 ls0 ws0">S</div><div class="t m2 x55 hb y95 ff2 fs8 fc0 sc0 ls0 ws0">1</div><div class="t m2 x8f h9 y94 ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>的<span class="_ _2"></span>一<span class="_ _2"></span>条<span class="_ _2"></span>带<span class="_ _a"></span>域<span class="_ _2"></span>内<span class="_ _8"></span><span class="ff2">(<span class="_ _15"> </span>)<span class="_ _7"> </span><span class="ff1">的<span class="_ _2"></span>变<span class="_ _2"></span>换<span class="_ _2"></span>式<span class="_ _2"></span>为<span class="_ _2"></span></span>:</span></div><div class="t m2 x90 ha y96 ff2 fs7 fc0 sc0 ls0 ws0">S<span class="_ _16"> </span>=<span class="_ _c"> </span>c</div><div class="t m2 x91 ha y97 ff2 fs7 fc0 sc0 ls0 ws0">1<span class="_ _a"></span>-<span class="_ _c"> </span>e</div><div class="t m2 x63 hb y98 ff2 fs8 fc0 sc0 ls0 ws0">-<span class="_ _16"> </span>S</div><div class="t m2 x92 hd y99 ff2 fsa fc0 sc0 ls0 ws0">1</div><div class="t m2 x93 hb y98 ff2 fs8 fc0 sc0 ls0 ws0">T</div><div class="t m2 x91 ha y9a ff2 fs7 fc0 sc0 ls0 ws0">1<span class="_ _a"></span>+<span class="_ _a"></span>e</div><div class="t m2 x63 hb y9b ff2 fs8 fc0 sc0 ls0 ws0">-<span class="_ _16"> </span>S</div><div class="t m2 x92 hd y9c ff2 fsa fc0 sc0 ls0 ws0">1</div><div class="t m2 x93 hb y9b ff2 fs8 fc0 sc0 ls0 ws0">T</div><div class="t m2 x51 h9 y9d ff1 fs6 fc0 sc0 ls0 ws0">要<span class="_ _6"></span>将</div><div class="t m2 x94 ha y9e ff2 fs7 fc0 sc0 ls0 ws0">S</div><div class="t m2 x95 hb y9f ff2 fs8 fc0 sc0 ls0 ws0">1</div><div class="t m2 x96 h9 y9d ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _6"></span>面<span class="_ _6"></span>映<span class="_ _6"></span>射<span class="_ _6"></span>到</div><div class="t m2 x57 ha y9e ff2 fs7 fc0 sc0 ls0 ws0">Z</div><div class="t m2 x7b h9 y9d ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _6"></span>面<span class="_ _6"></span>上<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>只<span class="_ _6"></span>要<span class="_ _6"></span>令</div><div class="t m2 x84 ha y9e ff2 fs7 fc0 sc0 ls0 ws0">Z=e</div><div class="t m2 x97 hb ya0 ff2 fs8 fc0 sc0 ls0 ws0">S1T</div><div class="t m2 x98 h9 y9d ff2 fs6 fc0 sc0 ls0 ws0">,<span class="_ _7"> </span><span class="ff1">就<span class="_ _6"></span>可<span class="_ _9"></span>得<span class="_ _6"></span>到</span></div><div class="t m2 x99 ha y9e ff2 fs7 fc0 sc0 ls0 ws0">S</div><div class="t m2 x4d h9 ya1 ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>和</div><div class="t m2 x8d ha ya2 ff2 fs7 fc0 sc0 ls0 ws0">Z</div><div class="t m2 x8e h9 ya1 ff1 fs6 fc0 sc0 ls0 ws0">平<span class="_ _2"></span>面<span class="_ _2"></span>的<span class="_ _2"></span>单<span class="_ _2"></span>值<span class="_ _2"></span>对<span class="_ _a"></span>应<span class="_ _2"></span>关<span class="_ _2"></span>系<span class="_ _6"></span><span class="ff2">:</span></div><div class="t m2 x9a ha ya3 ff2 fs7 fc0 sc0 ls0 ws0">S=<span class="_ _11"> </span>c</div><div class="t m2 x62 ha ya4 ff2 fs7 fc0 sc0 ls0 ws0">1<span class="_ _a"></span>-<span class="_ _c"> </span>Z</div><div class="t m2 x9b hb ya5 ff2 fs8 fc0 sc0 ls0 ws0">-<span class="_ _16"> </span>1</div><div class="t m2 x62 ha ya6 ff2 fs7 fc0 sc0 ls0 ws0">1<span class="_ _a"></span>+<span class="_ _a"></span>Z</div><div class="t m2 x9b hb ya7 ff2 fs8 fc0 sc0 ls0 ws0">-<span class="_ _16"> </span>1</div><div class="t m2 x51 ha ya8 ff2 fs7 fc0 sc0 ls0 ws0">C</div><div class="t m2 x9c h9 ya9 ff1 fs6 fc0 sc0 ls0 ws0">是<span class="_ _6"></span>一<span class="_ _6"></span>个<span class="_ _6"></span>常<span class="_ _6"></span>数<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>可<span class="_ _6"></span>以<span class="_ _6"></span>通<span class="_ _6"></span>过<span class="_ _6"></span>两<span class="_ _6"></span>种<span class="_ _6"></span>方<span class="_ _6"></span>法<span class="_ _6"></span>求<span class="_ _6"></span>得<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>比<span class="_ _6"></span>如<span class="_ _6"></span>要<span class="_ _6"></span>保<span class="_ _6"></span>证<span class="_ _6"></span>模<span class="_ _9"> </span>拟</div><div class="t m2 x4d h9 yaa ff1 fs6 fc0 sc0 ls0 ws0">滤<span class="_ _16"> </span>波<span class="_ _11"> </span>器<span class="_ _16"> </span>的<span class="_ _16"> </span>低<span class="_ _16"> </span>频<span class="_ _11"> </span>特<span class="_ _16"> </span>性<span class="_ _11"> </span>逼<span class="_ _16"> </span>近<span class="_ _11"> </span>数<span class="_ _16"> </span>字<span class="_ _11"> </span>滤<span class="_ _11"> </span>波<span class="_ _16"> </span>器<span class="_ _11"> </span>的<span class="_ _16"> </span>低<span class="_ _11"> </span>频<span class="_ _16"> </span>特<span class="_ _11"> </span>性<span class="_ _16"> </span><span class="ff2">,<span class="_"> </span></span>可<span class="_ _16"> </span>以<span class="_ _11"> </span>取</div><div class="t m2 x4d ha yab ff2 fs7 fc0 sc0 ls0 ws0">C=<span class="_ _a"></span>2<span class="_ _a"></span>/T</div><div class="t m2 x9d h9 yac ff1 fs6 fc0 sc0 ls0 ws0">。<span class="_ _2"></span>在<span class="_ _2"></span>设<span class="_ _6"></span>计<span class="_ _2"></span>好<span class="_ _2"></span>模<span class="_ _6"></span>拟<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _6"></span>器<span class="_ _2"></span>的<span class="_ _2"></span>系<span class="_ _6"></span>统<span class="_ _2"></span>函<span class="_ _6"></span>数</div><div class="t m2 x9e ha yab ff2 fs7 fc0 sc0 ls0 ws0">H</div><div class="t m2 x9f hb yad ff2 fs8 fc0 sc0 ls0 ws0">a</div><div class="t m2 x77 ha yab ff2 fs7 fc0 sc0 ls0 ws0">(<span class="_ _5"></span>s)</div><div class="t m2 x52 h9 yac ff1 fs6 fc0 sc0 ls0 ws0">之<span class="_ _2"></span>后<span class="_ _6"></span><span class="ff2">,<span class="_ _7"> </span></span>就<span class="_ _2"></span>可<span class="_ _6"></span>以<span class="_ _6"></span>直</div><div class="t m2 xa0 h9 yae ff1 fs6 fc0 sc0 ls0 ws0">【作<span class="_ _6"></span>者<span class="_ _9"> </span>简<span class="_ _9"> </span>介】</div><div class="t m2 xa1 he yaf ff1 fsb fc0 sc0 ls0 ws0">尤<span class="_ _a"></span>文<span class="_ _2"></span>坚<span class="_ _8"></span><span class="ff2">(</span></div><div class="t m2 xa2 hf yb0 ff2 fsc fc0 sc0 ls0 ws0">1<span class="_ _a"></span>9<span class="_ _a"></span>6<span class="_ _a"></span>9<span class="_ _a"></span>-</div><div class="t m2 x4c he yaf ff2 fsb fc0 sc0 ls0 ws0">)<span class="_ _c"> </span>,<span class="_ _c"> </span><span class="ff1">男<span class="_ _a"></span></span>,<span class="_ _11"> </span><span class="ff1">讲<span class="_ _2"></span>师<span class="_ _2"></span></span>,<span class="_ _11"> </span><span class="ff1">硕<span class="_ _2"></span>士</span></div><div class="t m2 xa3 hf yb0 ff2 fsc fc0 sc0 ls0 ws0">,</div><div class="t m2 xa4 he yaf ff1 fsb fc0 sc0 ls0 ws0">研<span class="_ _a"></span>究<span class="_ _2"></span>方<span class="_ _a"></span>向<span class="_ _2"></span><span class="ff2">:<span class="_ _11"> </span></span>电<span class="_ _2"></span>子<span class="_ _a"></span>信<span class="_ _2"></span>息<span class="_ _2"></span>技<span class="_ _a"></span>术<span class="_ _2"></span>。</div><div class="t m2 xa5 h10 yb1 ff2 fsd fc0 sc0 ls1 ws0">II<span class="ls2">R<span class="ff1 ls0">数字滤波器的设计</span></span></div><div class="t m2 x40 h5 yb2 ff1 fs2 fc0 sc0 ls0 ws0">尤<span class="_ _6"></span>文<span class="_ _9"></span>坚</div><div class="t m2 x47 h8 yb3 ff2 fs5 fc0 sc0 ls0 ws0">(<span class="_ _17"> </span><span class="ff1">广<span class="_ _a"></span>西<span class="_ _2"></span>农<span class="_ _a"></span>业<span class="_ _2"></span>职<span class="_ _2"></span>业<span class="_ _a"></span>技<span class="_ _2"></span>术<span class="_ _2"></span>学<span class="_ _a"></span>院<span class="_ _2"></span>电<span class="_ _2"></span>子<span class="_ _a"></span>信<span class="_ _2"></span>息<span class="_ _a"></span>工<span class="_ _2"></span>程<span class="_ _2"></span>系<span class="_ _a"></span></span>,<span class="_ _7"> </span><span class="ff1">广<span class="_ _2"></span>西<span class="_ _4"> </span>南<span class="_ _2"></span>宁</span></div><div class="t m2 xa6 h7 yb4 ff2 fs4 fc0 sc0 ls0 ws0">5<span class="_ _a"></span>3<span class="_ _a"></span>00<span class="_ _a"></span>0<span class="_ _a"></span>7</div><div class="t m2 xa7 h8 yb3 ff2 fs5 fc0 sc0 ls0 ws0">)</div><div class="t m2 xf h8 yb5 ff1 fs5 fc0 sc0 ls0 ws0">【<span class="_ _0"></span>摘<span class="_ _18"> </span>要】</div><div class="t m2 xa8 ha yb6 ff2 fs7 fc0 sc0 ls0 ws0">I<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 xa9 h9 yb7 ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>是<span class="_ _a"></span>一<span class="_ _2"></span>种<span class="_ _2"></span>递<span class="_ _6"></span>归<span class="_ _2"></span>型<span class="_ _6"></span>的<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _6"></span>器<span class="_ _2"></span><span class="ff2">,<span class="_ _c"> </span></span>它<span class="_ _6"></span>能<span class="_ _2"></span>改<span class="_ _2"></span>变<span class="_ _6"></span>输<span class="_ _2"></span>入<span class="_ _6"></span>信<span class="_ _2"></span>号<span class="_ _2"></span>所<span class="_ _6"></span>含<span class="_ _2"></span>频<span class="_ _2"></span>率<span class="_ _6"></span>成<span class="_ _2"></span>分<span class="_ _2"></span>的<span class="_ _6"></span>比<span class="_ _2"></span>例<span class="_ _2"></span>或<span class="_ _6"></span>者<span class="_ _2"></span>去<span class="_ _2"></span>除<span class="_ _6"></span>某<span class="_ _2"></span>些<span class="_ _2"></span>频<span class="_ _6"></span>率<span class="_ _2"></span>成<span class="_ _2"></span>分<span class="_ _6"></span><span class="ff2">,<span class="_ _c"> </span></span>在<span class="_ _6"></span>工</div><div class="t m2 xd h9 yb8 ff1 fs6 fc0 sc0 ls0 ws0">程<span class="_ _2"></span>上<span class="_ _2"></span>有<span class="_ _2"></span>广<span class="_ _2"></span>泛<span class="_ _2"></span>的<span class="_ _a"></span>应<span class="_ _2"></span>用<span class="_ _2"></span>。<span class="_ _2"></span>本<span class="_ _2"></span>文<span class="_ _2"></span>介<span class="_ _2"></span>绍<span class="_ _2"></span>了<span class="_ _2"></span>设<span class="_ _2"></span>计</div><div class="t m2 x2 ha yb9 ff2 fs7 fc0 sc0 ls0 ws0">I<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 xaa h9 yb8 ff1 fs6 fc0 sc0 ls0 ws0">数<span class="_ _2"></span>字<span class="_ _2"></span>滤<span class="_ _2"></span>波<span class="_ _2"></span>器<span class="_ _2"></span>的<span class="_ _a"></span>一<span class="_ _2"></span>般<span class="_ _2"></span>方<span class="_ _2"></span>法<span class="_ _2"></span>和<span class="_ _2"></span>步<span class="_ _2"></span>骤<span class="_ _2"></span>。</div><div class="t m2 xf h8 yba ff1 fs5 fc0 sc0 ls0 ws0">【<span class="_ _0"></span>关<span class="_ _6"></span>键<span class="_ _6"></span>词】</div><div class="t m2 xa8 ha ybb ff2 fs7 fc0 sc0 ls0 ws0">I<span class="_ _a"></span>I<span class="_ _a"></span>R</div><div class="t m2 x19 h9 ybc ff2 fs6 fc0 sc0 ls0 ws0">;</div><div class="t m2 x45 ha ybb ff2 fs7 fc0 sc0 ls0 ws0">FI<span class="_ _a"></span>R</div><div class="t m2 xab h9 ybc ff2 fs6 fc0 sc0 ls0 ws0">;<span class="_ _11"> </span><span class="ff1">数<span class="_ _2"></span>字<span class="_ _2"></span></span>;<span class="_ _c"> </span><span class="ff1">滤<span class="_ _2"></span>波<span class="_ _2"></span>器</span></div><div class="t m2 xf h8 ybd ff1 fs5 fc0 sc0 ls0 ws0">【<span class="_ _0"></span>中<span class="_ _6"></span>图<span class="_ _6"></span>分<span class="_ _9"></span>类<span class="_ _6"></span>号】</div><div class="t m2 x4c ha ybe ff2 fs7 fc0 sc0 ls0 ws0">TN7<span class="_ _a"></span>1<span class="_ _a"></span>3<span class="_ _a"></span>.<span class="_ _a"></span>7<span class="_ _a"></span>0<span class="_ _a"></span>2</div><div class="t m2 x1e h8 ybd ff1 fs5 fc0 sc0 ls0 ws0">【<span class="_ _0"></span>文<span class="_ _6"></span>献<span class="_ _6"></span>标<span class="_ _9"></span>识<span class="_ _6"></span>码】</div><div class="t m2 xac ha ybe ff2 fs7 fc0 sc0 ls0 ws0">A</div><div class="t m2 xad h8 ybd ff1 fs5 fc0 sc0 ls0 ws0">【<span class="_ _0"></span>文<span class="_ _6"></span>章<span class="_ _6"></span>编<span class="_ _9"></span>号】</div><div class="t m2 xae ha ybe ff2 fs7 fc0 sc0 ls0 ws0">1<span class="_ _a"></span>0<span class="_ _a"></span>0<span class="_ _a"></span>3<span class="_ _a"></span>-<span class="_ _c"> </span>2<span class="_ _2"></span>6<span class="_ _a"></span>7<span class="_ _a"></span>3<span class="_ _a"></span>(2<span class="_ _a"></span>0<span class="_ _a"></span>0<span class="_ _a"></span>8<span class="_ _2"></span>)0<span class="_ _a"></span>2<span class="_ _a"></span>-<span class="_ _19"> </span>5<span class="_ _a"></span>4<span class="_ _a"></span>-<span class="_ _19"> </span>0<span class="_ _a"></span>1</div><div class="t m2 x8b h8 ybf ff2 fs5 fc0 sc0 ls0 ws0">(<span class="_ _17"> </span><span class="ff1">下<span class="_ _a"></span>转<span class="_ _2"></span>第</span></div><div class="t m2 x72 h7 yc0 ff2 fs4 fc0 sc0 ls0 ws0">1<span class="_ _6"></span>9</div><div class="t m2 x6d h8 ybf ff1 fs5 fc0 sc0 ls0 ws0">页<span class="_ _5"></span><span class="ff2">)</span></div><div class="t m2 xa0 h11 yc1 ff2 fse fc0 sc0 ls0 ws0">54</div></div></div><div class="pi" data-data='{"ctm":[1.676136,0.000000,0.000000,1.676136,0.000000,0.000000]}'></div></div>
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