数字信号处理源代码，包括冲激响应、传递函数、零相位函数、全通函数、离散时间傅里叶变化、离散傅里叶变化、滤波器设计及级联-Digital signal processing source code, including impulse response, transfer function, zero-phase function, all-pass function, discrete-time Fourier changes, discrete Fourier changes, filter

1. To design IIR filters in MATLAB to achieve various types of frequency selectivity, e.g.,lowpass, highpass, bandpass, etc 2. To implement the designed IIR filters in different architectural forms (e.g., direct form vssecond-order cascade form) u