IIR Filter Design Using Bilinear Transformation Method

This computer program implements IIR filter design using the bilinear transformation method, covering the design of lowpass, bandpass, and highpass IIR digital filters. The bilinear transformation method is a widely-used technique that converts analog filter designs into their digital counterparts through a precise frequency mapping algorithm. The program incorporates key functions including analog prototype filter selection (Butterworth, Chebyshev, etc.), frequency warping compensation, and coefficient calculation routines. Through this program, users can efficiently perform filter design computations with configurable parameters such as cutoff frequencies, passband ripple, and stopband attenuation. Filter design represents a crucial step in digital signal processing, applicable to frequency analysis, signal filtering, and signal enhancement applications. The implementation allows users to design and realize various IIR filter types according to specific requirements, addressing diverse signal processing needs through proper filter specification and coefficient generation.