FIR_v2

Filter Design with T Filter

Coefficients

Source code

#ifndef SAMPLEFILTER_H_ #define SAMPLEFILTER_H_

/*

FIR filter designed with http://t-filter.appspot.com

sampling frequency: 100000000 Hz

• 0 Hz - 25000000 Hz gain = 1 desired ripple = 5 dB actual ripple = 4.05286559576885 dB

• 30000000 Hz - 50000000 Hz gain = 0 desired attenuation = -40 dB actual attenuation = -40.25040789635525 dB

*/

#define SAMPLEFILTER_TAP_NUM 21

typedef struct { double history[SAMPLEFILTER_TAP_NUM]; unsigned int last_index; } SampleFilter;

void SampleFilter_init(SampleFilter* f); void SampleFilter_put(SampleFilter* f, double input); double SampleFilter_get(SampleFilter* f);

#endif