Estimates the maximum autocorrelation of a vector.
Syntax
IppStatus ippsAutoCorrLagMax_Inv_16s (const Ipp16s* pSrc, int len, int lowerLag, int upperLag, Ipp32s* pMax, int* pMaxLag);
IppStatus ippsAutoCorrLagMax_Fwd_16s (const Ipp16s* pSrc, int len, int lowerLag, int upperLag, Ipp32s* pMax, int* pMaxLag);
IppStatus ippsAutoCorrLagMax_32f (const Ipp32f* pSrc, int len, int lowerLag, int upperLag, Ipp32f* pMax, int* pMaxLag);
Parameters
pSrc |
Pointer to the input vector [-upperLag, len]. |
len |
Length of autocorrelation. |
lowerLag |
Lower input lag value. |
upperLag |
Upper input lag value. |
pMax |
Pointer to the output maximum of the correlation. |
pMaxLag |
Pointer to the output lag which holds the maximum of the correlation. |
Description
These functions are declared in the ippsc.h file. The functions ippsAutoCorrLagMax_Inv and ippsAutoCorrLagMax_32f find the maximum autocorrelation within the given lag range as:
Here lowerLag ≤ n ≤ upperLag.
The function ippsAutoCorrLagMax_Fwd finds the maximum autocorrelation within the given lag range as given by:
Here lowerLag ≤ n ≤ upperLag.
If several maximums exist, functions return the first of them.
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error when the pSrc, pMax, or pMaxLag pointer is NULL. |
ippStsSizeErr |
Indicates an error when len is less than or equal to zero. |