'\" t
.\"     Title: lpanal
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
.\"      Date: 08/01/2011
.\"    Manual: The Canonical Csound Reference Manual
.\"    Source: 5.10
.\"  Language: English
.\"
.TH "LPANAL" "1" "08/01/2011" "5.10" "The Canonical Csound Reference"
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.SH "NAME"
lpanal \- Performs both linear predictive and pitch\-tracking analysis on a soundfile\&. .\" lpanal
.SH "DESCRIPTION"
.PP
Linear predictive analysis for the Csound
Linear Predictive Coding (LPC) Resynthesis
opcodes\&.
.SH "SYNTAX"
.sp
.if n \{\
.RS 4
.\}
.nf
\fBcsound \-U lpanal\fR [flags] infilename outfilename
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
\fBlpanal\fR [flags] infilename outfilename
.fi
.if n \{\
.RE
.\}
.SH "INITIALIZATION"
.PP

\fIlpanal\fR
performs both lpc and pitch\-tracking analysis on a soundfile to produce a time\-ordered sequence of
\fIframes\fR
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\&.
.PP

\fI\-a\fR
\-\- [alternate storage] asks lpanal to write a file with filter poles values rather than the usual filter coefficient files\&. When
\fIlpread\fR
/
\fIlpreson\fR
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\&.
.PP

\fI\-s srate\fR
\-\- 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\&.
.PP

\fI\-c channel\fR
\-\- channel number sought\&. The default is 1\&.
.PP

\fI\-b begin\fR
\-\- beginning time (in seconds) of the audio segment to be analyzed\&. The default is 0\&.0
.PP

\fI\-d duration\fR
\-\- duration (in seconds) of the audio segment to be analyzed\&. The default of 0\&.0 means to the end of the file\&.
.PP

\fI\-p npoles\fR
\-\- number of poles for analysis\&. The default is 34, the maximum 50\&.
.PP

\fI\-h hopsize\fR
\-\- 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\&.
.PP

\fI\-C string\fR
\-\- text for the comments field of the lpfile header\&. The default is the null string\&.
.PP

\fI\-P mincps\fR
\-\- lowest frequency (in Hz) of pitch tracking\&. \-P0 means no pitch tracking\&.
.PP

\fI\-Q maxcps\fR
\-\- highest frequency (in Hz) of pitch tracking\&. The narrower the pitch range, the more accurate the pitch estimate\&. The defaults are \-P70, \-Q200\&.
.PP

\fI\-v verbosity\fR
\-\- level of terminal information during analysis\&.
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
0 = none
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
1 = verbose
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
2 = debug
.RE
.sp
The default is 0\&.
.SH "EXAMPLES"
.PP


.sp
.if n \{\
.RS 4
.\}
.nf
\fIlpanal\fR \-a \-p26 \-d2\&.5 \-P100 \-Q400 audiofile\&.test lpfil22
.fi
.if n \{\
.RE
.\}
.sp

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 (\fI\-a\fR) output will be placed in "lpfil22" in the current directory\&.
.SS "File Format"
.PP
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
\fInpoles\fR
filter coefficients\&. The file is readable by Csound\*(Aqs
lpread\&.
.PP

\fIlpanal\fR
is an extensive modification of Paul Lanksy\*(Aqs lpc analysis programs\&.
.SH "AUTHORS"
.PP
\fBBarry Vercoe\fR
.br
MIT Media Lab
          
.RS 4
Author.
.RE
.PP
\fBDan Ellis\fR
.br
MIT Media Lab, 
          Cambridge
          Massachussetts
        
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br