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Hi, We do not have a sample that demonstrates the usage of FIR_Direct. Do you try to use this function for Intel Pentium Processor and Intel Itanium Processor families?
Actually, the ippsFIR functions is 1.5xfaster than ippsFIR_Direct functions. Because the FFT is used inside of ippsFIR , itusesfrequency-domain filtering. To compare the performance between ippsFIR and ippsFIR_Direct, you can refer the ps_ippsw7.csv (for example on a standard Intel Pentium 4 processor) under directory..ipp40 oolsperfsysdatafor detailed comparisions.