ShortTermAnalysisFilter

Performs short-term analysis filtering.

Syntax

IppStatus ippsShortTermAnalysisFilter_GSMFR_16s_I (const Ipp16s* pRC, Ipp16s* pSrcDstSpch, int len, Ipp16s* pMem);

Parameters

pRC	Pointer to the input reflection coefficients vector [8]: a₁, a₂,..., a₈.
pSrcDstSpch	Pointer to the input pre-processed speech and output short term residual vector [len].
len	Length of the input speech and output residual vectors.
pMem	Pointer to the filter memory vector [8]: m₀, m₁,..., m₇.

Description

The function ippsShortTermAnalysisFilter_GSMFR is declared in ippsc.h file. This function performs filtering of the input pre-processed speech vector s( n) and stores the result in the output short-term residual vector r( n) as given below: r₀ = s(n)

r_i = r_i-1 + a_i * m_i-1, i= 1,...,8

m₀ = s (n)

m_i = m_i-1 + a_i * r_i-1, i = 1,...,7

r (n) = r₈

where m_i, i = 0,...,7 is the filter memory and r_i, i = 0,...,8 is the reusable local memory.

The initial filter memory vector will be zeroed.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when one of the specified pointer is NULL.
ippStsRangeErr	Indicates an error when len is less than or equal to 0.