文件列表:

signal\signal\sigdemos\Contents.m (834, 1999-01-29)
signal\signal\sigdemos\cztdemo.m (21345, 1999-01-29)
signal\signal\sigdemos\demos.m (1462, 1999-01-29)
signal\signal\sigdemos\filtdem.m (3328, 1999-01-29)
signal\signal\sigdemos\filtdem2.m (5365, 1999-01-29)
signal\signal\sigdemos\filtdemo.m (36693, 1999-01-29)
signal\signal\sigdemos\moddemo.m (24040, 1999-01-29)
signal\signal\sigdemos\phone.m (6464, 1999-01-29)
signal\signal\sigdemos\sgolaydemo.m (8473, 1999-01-29)
signal\signal\sigdemos\sigdemo1.m (16609, 1999-01-29)
signal\signal\sigdemos\sigdemo2.m (11517, 1999-01-29)
signal\signal\sigdemos\sosdemo.m (22577, 1999-01-29)
signal\signal\siggui\@fdax\delete.m (1366, 1999-01-29)
signal\signal\siggui\@fdax\eq.m (242, 1999-01-29)
signal\signal\siggui\@fdax\fdax.m (2622, 1999-01-29)
signal\signal\siggui\@fdax\get.m (966, 1999-01-29)
signal\signal\siggui\@fdax\overlay.m (693, 1999-01-29)
signal\signal\siggui\@fdax\set.m (3004, 1999-01-29)
signal\signal\siggui\@fdax\setpos.m (4029, 1999-01-29)
signal\signal\siggui\@fdax\subsasgn.m (919, 1999-01-29)
signal\signal\siggui\@fdax\subsref.m (813, 1999-01-29)
signal\signal\siggui\@fdline\delete.m (541, 1999-01-29)
signal\signal\siggui\@fdline\eq.m (242, 1999-01-29)
signal\signal\siggui\@fdline\fdline.m (3013, 1999-01-29)
signal\signal\siggui\@fdline\get.m (1407, 1999-01-29)
signal\signal\siggui\@fdline\set.m (2807, 1999-01-29)
signal\signal\siggui\@fdline\subsasgn.m (929, 1999-01-29)
signal\signal\siggui\@fdline\subsref.m (817, 1999-01-29)
signal\signal\siggui\@fdmeas\delete.m (539, 1999-01-29)
signal\signal\siggui\@fdmeas\eq.m (242, 1999-01-29)
signal\signal\siggui\@fdmeas\fdmeas.m (3815, 1999-01-29)
signal\signal\siggui\@fdmeas\get.m (922, 1999-01-29)
signal\signal\siggui\@fdmeas\set.m (3804, 1999-01-29)
signal\signal\siggui\@fdmeas\subsasgn.m (927, 1999-01-29)
signal\signal\siggui\@fdmeas\subsref.m (817, 1999-01-29)
signal\signal\siggui\@fdmeas\userchange.m (1146, 1999-01-29)
signal\signal\siggui\@fdspec\delete.m (539, 1999-01-29)
signal\signal\siggui\@fdspec\eq.m (242, 1999-01-29)
signal\signal\siggui\@fdspec\fdspec.m (4227, 1999-01-29)
signal\signal\siggui\@fdspec\get.m (1425, 1999-01-29)
... ...

% README file for the Signal Processing Toolbox. % Version 4.2 (R11) 10-Jul-19*** % % % List of changes: % % NOTE: Items marked with '*' have changed in a way which might affect % your code. % % FIXES % ~~~~~ % latc2tf % tf2latc % - Now convert back and forth correctly. % pburg % - Now works correctly in the complex case. % sos2zp % - Now handles delays in filters correctly. For example: % sos=[0 1 0 1 2 0]; [z,p,k]=sos2zp(sos); previously returned: % z=0, p=[0;-2], k=0; and now returns z=[], p=-2, k=1. % xcorr % - Now no longer returns a small imaginary part for the zero lag % autocorrelation of complex data. % zp2sos % - Now handles delays in filters correctly. For example: % b=[0 2]; a=[1 1/2]; [z,p,k]=tf2zp(b,a); sos=zp2sos(z,p,k); % previously returned: [2.0000 0 0 1.0000 0.5000 0] and now % returns: [0 2.0000 0 1.0000 0.5000 0]. % % % ENHANCEMENTS % ~~~~~~~~~~~~ % detrend % Now ships with MATLAB; in the toolbox/matlab/datafun directory. % firrcos % - Now allows you to specify either a bandwidth or a roll-off factor. % - Now allows the design of either a normal or a square root raised % cosine filter. % - Now allows a user setable variable delay of the impulse response. % - Now accepts a window parameter in the filter design. % levinson % - Now is a CMEX function. % pburg % pmtm % pmusic % pyulear % * Now, when no Fs is specified, these functions return the PSD estimate, % Pxx(w), as a function of normalized angular frequency, % w=2*pi*f/Fs[rads/samp]. If Fs is specified, they return the psd % estimate as a function of physical frequency, f [Hz]. Fs defaults to % 1 Hz. These functions now correctly scale the psd by the sampling % frequency, for linear frequency, or 2*Pi, for normalized, angular % frequency. In addition they now return the single-sided PSD for real % signals and the double-sided PSD for complex signals. % % NOTE: The old versions of these files (pburg, pmtm, pmusic, and pyulear) % are available from the MathWorks's ftp site (ftp.mathworks.com)in % the Technical Support area. % % Note that the new functions pcov, pmcov and pwelch also adhere to % the specifications listed above. % poly2rc % - Now also returns the zero lag autocorrelation, when called with an % optional second input argument, the final prediction error. % rc2poly % * Now returns a column vector. % - Now also returns the final prediction error, when called with an % optional second input argument, the zero lag autocorrelation. % sos2ss % sos2tf % sos2zp % - Now allow for a optional second input argument, the gain returned % by the functions that convert to SOS (ss2sos, tf2sos and zp2sos). % ss2sos % zp2sos % * Now have an extra output argument corresponding to the gain of the % second-order sections structure. Furthermore, an extra input % argument can be given to specify the desired scaling of the % structure. Scaling choices are: infinity-norm, 2-norm and none. % % NEW FUNCTIONS % ~~~~~~~~~~~~~ % ac2poly % - Autocorrelation sequence to prediction polynomial conversion. % ac2rc % - Autocorrelation sequence to reflection coefficients conversion. % arburg % - AR parametric modeling via Burg's method. % arcov % - AR parametric modeling via covariance method. % armcov % - AR parametric modeling via modified covariance method. % aryule % - AR parametric modeling via the Yule-Walker method. % buffer % - Buffer a signal vector into a matrix of data frames. % is2rc % - Inverse sine parameters to reflection coefficients conversion. % lar2rc % - Log area ratios to reflection coefficients conversion. % lsf2poly % - Line spectral frequencies to prediction polynomial conversion. % pcov % - Power Spectrum estimate via Covariance method. % peig % - Power Spectrum estimate via the Eigenvector method. % pmcov % - Power Spectrum estimate via the Modified Covariance method. % poly2ac % - Prediction polynomial to autocorrelation sequence conversion. % poly2lsf % - Prediction polynomial to line spectral frequencies conversion. % pwelch % - Power Spectrum estimate via the Welch's modified periodogram method. % rc2ac % - Reflection coefficients to autocorrelation sequence conversion. % rc2is % - Reflection coefficients to inverse sine parameters conversion. % rc2lar % - Reflection coefficients to log area ratios conversion. % rlevinson % - Reverse Levinson-Durbin Recursion. % seqperiod % - Find minimum-length repeating sequence in a vector. % sgolay % - Design a Savitzky-Golay smoothing filter. % sgolaydemo % - Demonstrates Savitzky-Golay filtering. % sgolayfilt % - Filter a signal with a Savitzky-Golay smoothing filter. % sosfilt % - Filter a signal using second-order sections (biquad). % tf2sos % - Transfer Function to second-order sections conversion. % wavplay % - Play sound using Windows audio output device. % wavrecord % - Record sound using Windows audio input device. % % GRAPHICAL USER INTERFACE % ~~~~~~~~~~~~~~~~~~~~~~~~ % SPTOOL - Now loads a default session upon starting. Loading a default % session is an option that is set via SPTool's preferences. % SIGNAL BROWSER - Printing with preview is now possible. % FILTER DESIGNER - Added a Pole/Zero Editor as a new filter design method. % SPECTRUM VIEWER - Added the Covariance Method and the Modified Covariance Method. % * Removed the Maximum Entropy Method (MEM). % * Welch's method now calls PWELCH instead of PSD. Since PWELCH % does not provide a detrending option and it scales the PSD % magnitude by 1/Fs, the scale by 1/Fs option has been % removed along with the detrending option. % * The BURG and YULE AR methods now scale the PSD magnitude by 1/Fs. % * The option to specify an autocorrelation matrix to the Yule AR % method has been removed since it's not part of the Yule AR % method definition. % - Printing with preview is now possible. % ----------------------------------------------------------------------------- % README file for the Signal Processing Toolbox. % Version 4.1 21-Nov-1997 % % List of changes: % % * NOTE: Items marked with * have changed in a way which might affect your % code! % % FIXES % ~~~~~ % cremez % * Results structure fixes: RES.H is now the actual frequency % response on the frequency grid returned by RES.fgrid. RES.fextr % was wrong and has been corrected. RES.fgrid and RES.fextr are % now normalized correctly with 1 corresponding to half the % sampling frequency. % - The problem where cremez would return a complex filter when it % was supposed to return a real filter has been fixed. % % invfreqz % invfreqs % - Now both work for complex filters. % % levinson % lpc % xcorr % * Incorrectly returned conjugate for complex cases. % % % ENHANCEMENTS % ~~~~~~~~~~~~ % hamming % hanning % blackman % - now accept two new parameters to describe window sampling: % 'symmetric' or 'periodic'; passing in an empty matrix now returns % an empty matrix; passing in one point returns unity. % % % NEW FUNCTIONS % ~~~~~~~~~~~~~ % pburg % - power spectrum estimate using Burg's method. % pyulear % - power spectrum estimate using Yule-Walker AR method. % % GRAPHICAL USER INTERFACE % ~~~~~~~~~~~~~~~~~~~~~~~~ % SPTOOL - Support for importing component structures from the % MATLAB command line was added. % FILTER DESIGNER - The Filter Designer was completely redesigned. It has % a better interface and now it's extensible. % Measurements of the filter design can be viewed as % the filter is designed. It also allows the overlay % of spectra. % FILTER VIEWER - Now supports the viewing (overlaying) of multiple % filters. Measurement rulers were added. % SPECTRUM VIEWER - The following new PSD methods were added: Burg, FFT % and Yule-Walker AR. % % ----------------------------------------------------------------------------- % README file for the Signal Processing Toolbox. % Version 4.0.1 04-Apr-1997 % % This version contains fixes to bugs and a few enhancements in the GUI and % functions. The full Readme file for version 4.0 is included below. % % List of changes: % % * NOTE: Items marked with * have changed in a way which might affect your % code! % % chebwin % - Supports even length windows. % - Gives more accurate side-lobe heights especially when R is small % (< ~20 dB). % * This improvement will cause your results to change where you use the % Chebyshev window (especially when R is small). % cremez % - Allows for LGRID grid density input to improve exactness of the % filter design in some cases. % - Returns a few more results in the RES structure output. % dpss % * Always computes Slepian sequences directly, returning more accurate % (and slightly different) results for large N. % - Uses MEX-file based algorithm which is much faster than in ver 4.0. % - Can return any range of the N sequences, not just the first 2*NW. % impinvar % - Now works for multiple poles. % lpc % * Now calculates the correct gain G based on a biased autocorrelation. % The gain factor is now 1/sqrt(length(X)) times the previous gain % factor. % pmem % - The default for Fs is changed to 2, to be consistent with other % spectral estimation routines. % * This change will affect your plots if you use the second output % argument to this function without specifying Fs on input. % prony % * Now works correctly for complex inputs. % remez % - Is now a "function-function", which allows you to write a function % that defines the desired frequency response. This feature is % completely backwards compatible but allows greater flexibility in % designing filters with arbitrary frequency responses. See the % remez.m M-file for details about how to do this. % - Now takes an LGRID grid density input to improve exactness of the % filter design. By increasing this parameter your filter may be more % exactly equiripple but will take longer to design. % - A bug in filters which have very short bands in relation to the % filter length is fixed. % - Now optionally returns the maximum error, extremal frequencies, % frequency grid, and other results in a RES structure (like cremez). % resample % - For all combinations of signal length, P, Q, and filter length, the % output length is now exactly ceil(N*P/Q) where N is the input signal % length. For some short signals and filters the length was too % small. % sptool % - Now works with 0 and 1 length signals and filters. % - Allows for non-evenly spaced power spectrum data (imported only). % - Minor appearance / layout improvements to buttons, popupmenus, etc. % - Now remembers last location of save, export, and import from disk % operations. % - Fills in '.mat' when you type in a MAT-file name with no extension % when importing from disk into SPTool. % - Limits the number of popupmenu items to 24 in the "Selection" area of % Signal Browser and Spectrum Viewer. % - Saves Preferences on disk only at end of SPTool session. % % ---------------------------------------------------------------------------- % README file for the Signal Processing Toolbox. % Version 4.0 15-Nov-1996 % % The README FILE % This file contains a list of bug fixes, enhancements, and new features in % the Signal Processing Toolbox since version 3.0. There is also an important % section highlighting changes which might affect the behavior of any m-files % that you have which use the Toolbox. % % Use help on any of these files for more information. % % BUG FIXES % butter, cheby1 - Exact zeros and numerator polynomials for analog case. % buttord, cheb1ord, cheb2ord, ellipord - The minimum filter order was % incorrectly overestimated for some bandstop filters. This has been % corrected. % decimate - Uses a lower order Chebyshev anti-aliasing filter in case % the default 8th order filter is bogus. Prevents problems when using % very high decimation factors. See the help for more information. % impinvar - The filter is now scaled by 1/Fs. This causes the magnitude % response of the discrete filter to match that of the analog filter. % rc2poly - Modified to correctly deal with complex inputs. % remez, firls - The coefficients in the differentiator case are now correct % so that when applied to a signal the output is the correct sign. % remez - The maximum number of iterations was increased from 25 to 250 to % prevent the design of non-equiripple filters. Also seg faults are now % avoided in the case of a large number of bands and a short filter. % % ENHANCEMENTS TO OLD FUNCTIONS % cceps - New output parameter for keeping track of rotation applied before % FFT, useful in inversion. % fftfilt - Support for multiple filters. % fir1 - Now works for multiple band filters (in addition to low, high, % band-pass and band-stop filters). New 'noscale' option to prevent % scaling of response after windowing. % firls - No matrix inversion when full band is specified. This makes the % design of these filters much more efficient. % levinson - Support has been added for complex inputs, and multiple column % input. % lpc - Support has been added for complex and multiple column inputs. Also, % the gain is now output for the AR estimates. % remezord - Cell array output with 'cell' option for convenience. % resample - Uses upfirdn and is MUCH faster when q (the decimation factor) % is larger than one. Also, resample is now vectorized to work on the % columns of a signal matrix. % specgram - Works on a set of specified frequencies using either czt or % upfirdn. % strips - New scaling parameter allows control of the vertical height of % the strips. % psd, csd - Chi-squared confidence intervals have been added. % xcorr, xcov - Option for computing the correlation at a specified number % of lags. % % NEW FUNCTIONS % SIGNAL GENERATION % chirp - Swept-frequency cosine generator. % gauspuls - Gaussian pulse generator. % pulstran - Pulse train generator. % rectpuls - Sampled aperiodic rectangle generator. % tripuls - Sampled aperiodic triangle generator. % % FILTER DESIGN % cremez - FIR filter design which minimizes the complex Chebyshev error % to design arbitrary, including non-linear phase and complex, FIR % filters. % fircls, fircls1 - Constrained Least-Squares algorithm for minimizing % LS error subject to maximum ripple constraints. % firrcos - Raised cosine FIR filter design from frequency domain % specifications for communications applications. % kaiserord - Order estimation formula for finding the minimum % order FIR Kaiser windowed filter to meet a set of frequency % domain specifications. % maxflat - Maximally flat IIR and symmetric FIR lowpass filter design. % Also known as generalized Butterworth filters. % % MULTIRATE FILTER BANKS % upfirdn - MEX-file implementing upsampling, FIR filtering, and % downsampling using an efficient multirate implementation. % Algorithm supports multiple signals and/or multiple filters. % % LATTICE FILTER SUPPORT % latc2tf, tf2latc - Conversion of lattice (or lattice/ladder) % coefficients to and from transfer function form. % latcfilt - Fast MEX implementation of lattice and lattice/ladder filters. % % SPECTRAL ANALYSIS % pmem - PSD estimate using Maximum Entropy method. % pmusic - PSD estimate using MUSIC algorithm. % pmtm - PSD and confidence intervals using Multiple-taper method. % dpss - Discrete Prolate Spheroidal sequences (Slepian sequences). % dpsssave, dpssload, dpssdir, dpssclear - DPSS data base for storing % long sequences. % % OTHER % icceps - inverse Complex Cepstrum. % % NEW - GRAPHICAL USER INTERFACE (GUI) TOOLS % % SPTOOL - graphical environment for analyzing and manipulating Signals, % Filters, and Spectra. You manage and keep track of these objects in % the SPTool figure, and bring up client tools for more detailed % analysis. The client tools are: % % SIGNAL BROWSER - Interactive signal browsing allows display, measurement, % and analysis of signals. % FILTER VIEWER - Graphical tool for viewing the magnitude & phase % response, group delay, zeros & poles, impulse response, % and step response of a digital filter. % FILTER DESIGNER - filter design tool for designing lowpass, highpass, % bandpass and bandstop filters to meet a frequency % domain attenuation criterion. % SPECTRUM VIEWER - Graphical analysis of frequency domain data using % different methods of spectral estimation. % % ************************************************************************ % *** WARNING !!! *** % The following functions have been fixed or enhanced in a way that might % affect your existing code. % % csd - default detrending mode changed to 'none'. % - confidence intervals have changed. % cohere - default detrending mode changed to 'none'. % psd - default detrending mode changed to 'none' % - confidence intervals have changed. % tfe - default detrending mode changed to 'none'. % resample - uses upfirdn for efficiency. The output of this function % will differ from previous versions in two cases: % i) Zero-order hold. % Previously the output was purely causal, now returns the nearest % sample. % ii) Input filter with even filter length. % Sometimes would error out. Now will always work accurately, ... ...

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