mlib_SignalLPCPerceptWeight_S16(3MLIB)

Name

mlib_SignalLPCPerceptWeight_S16 - perform perceptual weighting on input signal

Synopsis

cc [ flag... ] file... –lmlib [ library... ]
#include <mlib.h>

mlib_status mlib_SignalLPCPerceptWeight_S16(mlib_s16 *sigwgt,
     const mlib_s16 *signal,  const mlib_s16 *lpc, mlib_s32 lscale,
     mlib_s16 r1, mlib_s16 r2, void *state);

Description

The mlib_SignalLPCPerceptWeight_S16() function performs perceptual weighting on input signal.

The perceptual weighting filter is defined as following.

	        A(z*r1)
	W(z) = ---------
	        A(z*r2)

where A(z) is the inverse filter

	            M          -i
	A(z) = 1 - SUM a(i) * z
	           i=1

See G.723.1, G.728, G.729, G.729A, GSM EFR standards.

Parameters

The function takes the following arguments:

sigwgt

The weighted signal vector, the signal samples are in Q15 format.

signal

The input signal vector, the signal samples are in Q15 format.

lpc

The linear prediction coefficients.

lscale

The scaling factor of the linear prediction coefficients, where actual_data = input_data * 2**(-scaling_factor).

r1

The perceptual weighting filter coefficient, the coefficient is in Q15 format, it is treated as 1 if 0 is supplied.

r2

The perceptual weighting filter coefficient, the coefficient is in Q15 format, it is treated as 1 if 0 is supplied.

state

Pointer to the internal state structure.

Return Values

The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE Interface Stability Committed MT-Level MT-Safe

See also

mlib_SignalLPCPerceptWeightInit_S16(3MLIB), mlib_SignalLPCPerceptWeightFree_S16(3MLIB), attributes(5)