Linux 2.6 - man page for lpanal (linux section 1)
|Linux & Unix Commands - Search Man Pages
LPANAL(1) The Canonical Csound Reference LPANAL(1)
lpanal - Performs both linear predictive and pitch-tracking analysis on a soundfile. .
Linear predictive analysis for the Csound Linear Predictive Coding (LPC) Resynthesis
csound -U lpanal [flags] infilename outfilename
lpanal [flags] infilename outfilename
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
-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
-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.
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
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.
MIT Media Lab
MIT Media Lab,
5.07 06/23/2009 LPANAL(1)
All times are GMT -4. The time now is 07:43 PM.