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F2812 IIR Problem

Hello

sorry about my english

I am a beginner programmer working with the DSP F2812.

I used the eziir16.m to design a band pass filter,the frequency of my input signal is 7 Hz and noise,and the specifications of the filter are

Fp=[2 20],Fs=[0.4 40].But the output signal is zero, this is the problem,i test the low pass filter only,it is well.

I guess the problem is the high pass filter.

The frequency of the low pass and stop frequency is small,so the IIR16_COEFF designed by eziir16.m is so small and become to 0,

maybe the IIR16_COEFF is useless.

please can anybody help me?

Thanks

sky