数字电子技术iiii.ppt

文档介绍：Figure 13–1 An original analog signal (sine wave) and its “stairstep” approximation. Thomas L. FloydDigital Fundamentals, 9eCopyright ?2006 by Pearson Education, Saddle River, New Jersey 07458All rights 13–2 Basic block diagram of a typical digital signal processing system. Thomas L. FloydDigital Fundamentals, 9eCopyright ?2006 by Pearson Education, Saddle River, New Jersey 07458All rights 13–3 Illustration of the sampling process. Thomas L. FloydDigital Fundamentals, 9eCopyright ?2006 by Pearson Education, Saddle River, New Jersey 07458All rights 13–4 Bouncing ball analogy of sampling theory. Thomas L. FloydDigital Fundamentals, 9eCopyright ?2006 by Pearson Education, Saddle River, New Jersey 07458All rights 13–5 A basic illustration of the condition fsample< 2fa(max). Thomas L. FloydDigital Fundamentals, 9eCopyright ?2006 by Pearson Education, Saddle River, New Jersey 07458All rights 13–6 After low-pass filtering, the frequency spectra of the analog and the sampling signals do not overlap, thus eliminating aliasing L. FloydDigital Fundamentals, 9eCopyright ?2006 by Pearson Education, Saddle River, New Jersey 07458All rights 13–7 Illustration of a sample-and-hold operation. Thomas L. FloydDigital Fundamentals, 9eCopyright ?2006 by Pearson Education, Saddle River, New Jersey 07458All rights 13–8 Basic function of an analog-to-digital (ADC) converter (The binary codes and number of bits are arbitrarily chosen for illustration only).The ADC output waveform that represents the binary codes is also shown. Thomas L. FloydDigital Fundamentals, 9eCopyright ?2006 by Pearson Education, Saddle River, New Jersey 07458All rights 13–9 Sample-and-hold output waveform with four quantization levels. The original analog w