QMFEncode

Performs QMF analysis filtering.

Syntax

IppStatus ippsQMFEncode_G7291_16s(const Ipp16s* pSrc, int len, Ipp16s* pDstLowBand, Ipp16s* pDstHighBand, IppsQMFState_G7291_16s* pState);

Parameters

pSrc	Pointer to the input vector [len].
len	Number of samples.
pDstLowBand	Pointer to the output lower-band vector [len/2].
pDstHighBand	Pointer to the output higher-band vector [len/2].
pState	Pointer to the memory supplied for QMF encode.

Description

The function ippsQMFEncode_G7291 is declared in the ippsc.h file. This function is used to split the input signal sampled at 16000 Hz into two signals sampled at 8000 Hz: a lower band signal and a higher band signal using Quadrature Mirror Filter (QMF) analysis filterbank. The description of the QMF analysis algorithm can be found in [ITU7291] section 6.1.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when one of the specified pointers is NULL.
ippStsSizeErr	Indicates an error when len is less than or equal to 0, or greater than 320.