QMFEncode

Performs QMF analysis of the uniform PCM input.

Syntax

IppStatus ippsQMFEncode_G722_16s(const Ipp16s* pSrc, Ipp16s* pDst, int len, Ipp16s* delay);

Parameters

pSrc	Pointer to the uniform PCM input speech vector.
pDst	Pointer to the synthesis QMF samples output vector.
len	The length of input/output vectors, must be a multiple of two.
delay	Pointer to the buffer of a delay line.

Description

The function ippsQMFEncode_G722_16s is declared in the ippsc.h file.

This function uses Quadrature Mirror Filtering (QMF) of the 14-bit uniform PCM speech input to compute the lower and higher sub-band signal components for the Sub-Band ADPCM encoder. Computations are done in accordance with ITU-T Recommendation G.722.

Return Values

ippStsNoErr	Indicates no error.
ippStsBadArgErr	Indicates an error when len is less than or equal to 0.
ippStsSizeErr	Indicates an error when len is not a multiple of two.
ippStsNullPtrErr	Indicates an error when one of the specified pointers is NULL.