Description:
lpanal performs both lpc and pitch-tracking analysis on a soundfile to produce a time-ordered sequence of frames of control information suitable for Csound resynthesis. Analysis is conditioned by the control flags below. A space is optional between the flag and its value.
-a - [alternate storage] asks lpanal to write a file with filter poles values rather than the usual filter coefficient files. When lpread / lpreson are used with pole files, automatic stabilization is performed and the filter should not get wild. (This is the default in the Windows GUI) - Changed by Marc Resibois.
-s srate - sampling rate of the audio input file. This will over-ride the srate of the soundfile header, which otherwise applies. If neither is present, the default is 10000.
-c channel - channel number sought. The default is 1.
-b begin - beginning time (in seconds) of the audio segment to be analyzed. The default is 0.0
-d duration - duration (in seconds) of the audio segment to be analyzed. The default of 0.0 means to the end of the file.
-p npoles - number of poles for analysis. The default is 34, the maximum 50.
-h hopsize - hop size (in samples) between frames of analysis. This determines the number of frames per second (srate / hopsize) in the output control file. The analysis framesize is hopsize * 2 samples. The default is 200, the maximum 500.
-C string - text for the comments field of the lpfile header. The default is the null string.
-P mincps - lowest frequency (in Hz) of pitch tracking. -P0 means no pitch tracking.
-Q maxcps - highest frequency (in Hz) of pitch tracking. The narrower the pitch range, the more accurate the pitch estimate. The defaults are -P70, -Q200.
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