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#ifndef __FIRfilter
#define __FIRfilter
#include <math.h>
#define PI 3.1415926535897932384626433832795f
#define SHELF_START_FIR 0.333f
//-----------------------------------------------------------------------------
void calculateFIRidealLowpassCoefficients(float cutoff, float samplerate,
int numTaps, float *coefficients);
void applyKaiserWindow(int numTaps, float *coefficients, float attenuation);
float besselIzero(float in);
float besselIzero2(float in);
//-----------------------------------------------------------------------------
inline float processFIRfilter(float *in, int numTaps, float *coefficients,
long inPos, long arraySize)
{
float out = 0.0f;
if ( (inPos+numTaps) > arraySize )
{
for (long i=0; i < numTaps; i++)
out += in[(inPos+i)%arraySize] * coefficients[i];
}
else
{
for (long i=0; i < numTaps; i++)
out += in[inPos+i] * coefficients[i];
}
return out;
}
#endif
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