'\" te
.\" Copyright (c) 2007, Sun Microsystems, Inc.  All Rights Reserved 
.TH mlib_SignalLPCPerceptWeight_F32 3MLIB "2 Mar 2007" "SunOS 5.11" "mediaLib Library Functions"
.SH NAME
mlib_SignalLPCPerceptWeight_F32 \- perform perceptual weighting on input signal
.SH SYNOPSIS
.LP
.nf
cc [ \fIflag\fR... ] \fIfile\fR... \fB-lmlib\fR [ \fIlibrary\fR... ]
#include <mlib.h>

\fBmlib_status\fR \fBmlib_SignalLPCPerceptWeight_F32\fR(\fBmlib_f32 *\fR\fIsigwgt\fR,
     \fBconst mlib_f32 *\fR\fIsignal\fR, \fBconst mlib_f32 *\fR\fIlpc\fR, \fBmlib_f32\fR \fIr1\fR,
     \fBmlib_f32\fR \fIr2\fR, \fBvoid *\fR\fIstate\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBmlib_SignalLPCPerceptWeight_F32()\fR function performs perceptual weighting on input signal.
.sp
.LP
The perceptual weighting filter is defined as following.
.sp
.in +2
.nf
	        A(z*r1)
	W(z) = ---------
	        A(z*r2)
.fi
.in -2

.sp
.LP
where \fBA(z)\fR is the inverse filter
.sp
.in +2
.nf
	            M          -i
	A(z) = 1 - SUM a(i) * z
	           i=1
.fi
.in -2

.sp
.LP
See G.723.1, G.728, G.729, G.729A, GSM EFR standards.
.SH PARAMETERS
.sp
.LP
The function takes the following arguments:
.sp
.ne 2
.mk
.na
\fB\fIsigwgt\fR\fR
.ad
.RS 10n
.rt  
The weighted signal vector.
.RE

.sp
.ne 2
.mk
.na
\fB\fIsignal\fR\fR
.ad
.RS 10n
.rt  
The input signal vector.
.RE

.sp
.ne 2
.mk
.na
\fB\fIlpc\fR\fR
.ad
.RS 10n
.rt  
The linear prediction coefficients.
.RE

.sp
.ne 2
.mk
.na
\fB\fIr1\fR\fR
.ad
.RS 10n
.rt  
The perceptual weighting filter coefficient, it is treated as \fB1\fR if \fB0\fR is supplied.
.RE

.sp
.ne 2
.mk
.na
\fB\fIr2\fR\fR
.ad
.RS 10n
.rt  
The perceptual weighting filter coefficient, it is treated as \fB1\fR if \fB0\fR is supplied.
.RE

.sp
.ne 2
.mk
.na
\fB\fIstate\fR\fR
.ad
.RS 10n
.rt  
Pointer to the internal state structure.
.RE

.SH RETURN VALUES
.sp
.LP
The function returns \fBMLIB_SUCCESS\fR if successful. Otherwise it returns \fBMLIB_FAILURE\fR.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityCommitted
_
MT-LevelMT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBmlib_SignalLPCPerceptWeightInit_F32\fR(3MLIB), \fBmlib_SignalLPCPerceptWeightFree_F32\fR(3MLIB), \fBattributes\fR(5)