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LPANAL(1)			  The Canonical Csound Reference			LPANAL(1)

NAME
       lpanal - Performs both linear predictive and pitch-tracking analysis on a soundfile. .

DESCRIPTION
       Linear predictive analysis for the Csound Linear Predictive Coding (LPC) Resynthesis
       opcodes.

SYNTAX
	   csound -U lpanal [flags] infilename outfilename

	   lpanal [flags] infilename outfilename

INITIALIZATION
       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.

       -v verbosity -- level of terminal information during analysis.

       o   0 = none

       o   1 = verbose

       o   2 = debug

       The default is 0.

EXAMPLES
	   lpanal -a -p26 -d2.5 -P100 -Q400 audiofile.test lpfil22

       will analyze the first 2.5 seconds of file "audiofile.test", producing srate/200 frames
       per second, each containing 26-pole filter coefficients and a pitch estimate between 100
       and 400 Hertz. Stabilized (-a) output will be placed in "lpfil22" in the current
       directory.

   File Format
       Output is a file comprised of an identifiable header plus a set of frames of floating
       point analysis data. Each frame contains four values of pitch and gain information,
       followed by npoles filter coefficients. The file is readable by Csound's lpread.

       lpanal is an extensive modification of Paul Lanksy's lpc analysis programs.

AUTHORS
       Barry Vercoe
       MIT Media Lab

	   Author.

       Dan Ellis
       MIT Media Lab,
		 Cambridge
		 Massachussetts

	   Author.

COPYRIGHT
5.07					    06/23/2009					LPANAL(1)
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