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-Basic knowledge of signals and systems, including continuous signal with the model, discrete signals and model　common signal, including Z Transform Transform, Chirp Z Transform, FFT transform, DCT transform and Hilbert transform, etc.　discrete system architecture including IIR, fir and Lattice structure　IIR filter design, including analog and digital low-pass, high-