说明：  模拟单边带调幅及解调 基本要求：  产生300 ~ 3400Hz的调制信号，画出时域波形及频谱；  产生载波信号，频率自定义，画出时域波形及频谱；  产生加性高斯白噪声，画出时域波形及频谱；  单边调幅，画出叠加噪声后的调制信号和已调信号的波形及频谱；  设计滤波器，画出幅频响应图；  解调，画出解调后的信号时域波形及频谱，并对比分析。
(Simulation of single sideband amplitude modulation and demodulation basic requirements:  300 ~ 3400Hz generate the modulation signal, draw time-domain waveform and frequency spectrum  generated carrier signal, the frequency of self-definition, draw time-domain waveform and frequency spectrum  have a high additive Adams white noise, draw time-domain waveform and frequency spectrum  unilateralism AM, draw superimposed noise signal and the modulation transfer signal waveform and spectrum  design filters, amplitude-frequency response of draw  demodulation, After demodulation of the signal to draw time-domain waveform and frequency spectrum, and comparative analysis.)