Approximate Transfer Function using the following forms:
- Low-Pass: Inverse Chebysev
- Band-Pass: Inverse Chebysev
- Band-Elimination: Chebysev
- High-Pass: Butterworth
- Low-Pass: fp = 4.4KHz, fs = 8.36KHz, amax = 0.6125 dB, amin = 22.75 dB
- Band-Pass: f1 = 1.55KHz, f2 = 1.756KHz, f3 = 1.412KHz, f4 = 1.928KHz, amax = 0.5667 dB, amin = 35.11 dB
- Band-Elimination: f1 = 1.80KHz, f2 = 3.472KHz, f3 = 2.133KHz, f4 = 2.93KHz αmax = 0.567 dB, amin = 28.11 dB
- High-Pass: fs = 1538.46 Hz, fp = 4000 Hz, amax = 0.707 dB, amin = 25.33 dB