中文说明：
信号与系统基础知识包括连续信号与模型、离散信号与模型；常用信号变换包括Z变换、Chirp Z变换、FFT变换、DCT变换和Hilbert变换等；离散系统结构包括IIR、fir和Lattice结构；IIR滤波器设计包括模拟和数字低通、高。
English Description：
The basic knowledge of signal and system includes continuous signal and model, discrete signal and model; Common signal transforms include Z transform, chirp Z transform, FFT transform, DCT transform and Hilbert transform; Discrete system structures include IIR, fir and lattice structures; IIR filter design includes analog and digital low-pass and high-pass filters