电子通讯 第二章 数字信号处理基础.pdf

现代数字信号处理 现代数字信号处理 孙洪 Modern Digital Signal Modern Digital Signal Processing Processing 2 Fundamentals of Discrete-Time 2 Fundamentals of Discrete-Time (deterministic) Signal Processing (deterministic) Signal Processing 1 武汉大学 电子信息学院 研究生课程 2002 孙洪 2 Fundamentals of Discrete-Time 2 Fundamentals of Discrete-Time (deterministic) Signal Processing (deterministic) Signal Processing lRepresentation and classification of signal – In time domain and in transform domain lRepresentation and classification of system – In time domain and in transform domain lDiscrete Fourier Transform; z-Transform lA/D conversion lFrequency selective filter lImplementation based on decomposition 2 武汉大学 电子信息学院 研究生课程 2002 孙洪 2 Fundamentals of DSP 2.1 Representation and 2.1 Representation and Classification of Discrete-Time Classification of Discrete-Time Signal in Time Domain Signal in Time Domain l Continuous-time, discrete-time and digital signals lMathematical description of signals – Deterministic signals – equations, e.g.: x (n) an – Basic signals – Signal classification 3 武汉大学 电子信息学院 研究生课程 2002 孙洪 2 Fundamentals of DSP Basic Signal Basic Signal l The unit sample 1, n 0 d (n) (impulse) sequence 0, n 0 l The unit step 1, n 0 u(n) sequence