Problems with the FIRMR Ffnction

gregorio_chindamo — Tue, 29 Nov 2011 10:04:46 GMT

Hi all,

I am trying to perform a Mutirate Filtering using the IPP funtions in order to speed up clculation time.

Unfortunately I am not obtaining the expected output result.

Following I have attached the piece of code of interest. I would be gratefull if somebody could give me a hint.

-----------------------------------------------------
IppStatus status;
status = ippInit();
IppsFIRState_32f *pStateI;
Ipp32f *pDlyLine = new Ipp32f[(tapsLen+upFactor-1)/upFactor]; //Ipp32f *pDlyLine = NULL not
working; tapsLen=63;upFactor=625;
memset(pDlyLine, 0, sizeof(Ipp32f)*((tapsLen+upFactor-1)/upFactor));
int numIters = uSampleLength/downFactor; //uSampleLenght is the lenght of input array = 4608; downFactor=192;
status = ippsFIRMRInitAlloc_32f(&pStateI, pTaps, tapsLen, upFactor, upPhase, downFactor, downPhase, pDlyLine); //down and up phases are equal to 0;
status = ippsFIRMR_Direct_32f(pInISample, fIBufferRes, numIters, pTaps, tapsLen, upFactor, upPhase, downFactor, downPhase, pDlyLine);//fIBufferRes is the output buffer of lenght 15000;
status = ippsFIRFree_32f(pStateI);

Thanks you in advance.

Gregorio

Problems with the FIRMR Ffnction

igorastakhov — Tue, 29 Nov 2011 12:20:32 GMT

Hi Gregorio,

you mixed up 2 functionalities:
FIR and FIR_Direct
Use the first one as the second is just a wrapper for the first.
So first of all call
ippsFIRMRInitAlloc and initialize MultiRate FIR state structure
then call
ippsFIR (it has 2 path - for single rate and for multi-rate - depends on context (state structure))
then call
ippsFIRFree

and delay line pointer may be NULL if you use right function flow

Regards,
Igor

topic Problems with the FIRMR Ffnction in Intel® Integrated Performance Primitives

Problems with the FIRMR Ffnction

Problems with the FIRMR Ffnction