Downsample_AMRWBE

Performs the signal decimating.

Syntax

IppStatus ippsDownsample_AMRWBE_16s(const Ipp16s* pSrcSignal, int lenSrc, Ipp16s* pDstSignal, Ipp16s* pMem, Ipp32s bandIdx);

Parameters

pSrcSignal	Pointer to the source signal.
lenSrc	Length of the source vector, [640] for 8 kHz source signal, [1280] for 16 kHz and [1920] for 24 kHz.
pDstSignal	Pointer to destination signal [1024].
pMem	Pointer to the memory for descimating [46].
bandIdx	Index of interpolating band; possible values: 0 for 0..6.4 kHz band, any other for 6.4..10.8 kHz band.

Description

The function ippsDownsample_AMRWBE is declared in ippsc.h file. This function performs downsampling of the source signal pSrcSignal with the following sample rate: 8, 16, 24 kHz. The function filters input signal to the band 0...6.4 kHz, or 6.4...10.8 kHz in accordance with the parameter bandIdx, and downsamples (upsamples for 8 kHz input signal) to 12.6 kHz.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when one of the specified pointer is NULL.
ippStsSizeErr	Indicates an error when lenDst has an illegal value.