Figure 15: The results of IIR filter testbench. (a) Magnitude spectrum of input signal. (b) IIR filter frequency response (filter response parameters: sampling frequency = 10 kHz, lower cutoff frequency = 2.190 kHz, higher cutoff frequency = 22.10 kHz, passband ripple = 0.1 dB, stopband attenuation = 200 dB, number of coefficients = 6, and number of sections = 6). (c) Magnitude spectrum of Matlab IIR filter output. (d) Magnitude spectrum of FPGA IIR filter output.