tailieunhanh - Lecture Digital signal processing: Chapter 1 - Nguyen Thanh Tuan

This chapter introduce sampling and reconstruction. After studying this chapter you will be able to: Sampling theorem, spectrum of sampling signals, anti-aliasing pre-filter, analog reconstruction. Inviting you refer. | 1 Sampling and Reconstruction Nguyen Thanh Tuan . B 1 Department of Telecommunications 113B3 1 Ho Chi Minh City University of Technology Email nttbk97@ 1 Content Sampling Q Sampling theorem Q Spectrum of sampling signals Anti-aliasing pre-filter Q Ideal pre-filter Q Practical pre-filter Analog reconstruction Q Ideal reconstructor Q Practical reconstructor Digital Signal Processing 2 Sampling and Reconstruction 1. Introduction A typical signal processing system includes 3 stages AA sampler and quantizer 10011101 I OHO . . . digital signal processor 110010100 1101 . . . analog Z AA analog input digital digital constructor analog input output output The analog signal is digitalized by an A D converter The digitalized samples are processed by a digital signal processor. o The digital processor can be programmed to perform signal processing operations such as filtering spectrum estimation. Digital signal processor can be a general purpose computer DSP chip or other digital hardware. The resulting output samples are converted back into analog by a D A converter. Digital Signal Processing 3 Sampling and .