LagWindow

Applies 60Hz bandwidth expansion.

Syntax

IppStatus ippsLagWindow_G729_32s_I (Ipp32s* pSrcDst, int len);

Parameters

pSrcDst	Pointer to the autocorrelation vector.
len	Number of elements in the vector.

Description

The function ippsLagWindow_G729 is declared in the ippsc.h file. This function applies a 60Hz bandwidth expansion to the autocorrelation vector as follows:

r[0] = 1.0001*r[0]

r[i] = w_lag[i]*r[i] ,i = 0,.. len-1

where

w_lag[i] = exp(-1/2*(2πf₀ *i/f_S)²),

and f₀ = 60Hz, f_s= 8000Hz.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when the pSrcDst pointer is NULL.
ippStsSizeErr	Indicates an error when len is less than or equal to 0.
ippStsRangeErr I	ndicates an error when len > 12.