【正文】 2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 226 Comparing signals in the A/D/D/A chain. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 219 Analogtodigital conversion. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. Nyquist Sampling theorem ? A signal with maximum frequency of W Hz must be sampled at least 2W times per seconds to make it possible to reconstruct the original signal being sampled. ? This minimum sampling frequency is called the Nyquist sampling rate. FIGURE 26 Aliasing in the time domain with 40 kHz sampling (adapted from Pohlmann, 1994). Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 123 Spectrum for CEG chord (2502500 Hz). Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 118 Continued. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 113 Signals and spectra. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。直到 20世紀 70年代末 80年代初世界上第一片單片可編程 DSP芯片的誕生，才將理論研究結(jié)果廣泛應用到低成本的實際系統(tǒng)中，并且推動了新的理論和應用領(lǐng)域的發(fā)展。 數(shù)字信號處理在 理論上的發(fā)展推動 了數(shù)字信號處理 應用的發(fā)展 。 ? 數(shù)字信號處理器 （ Digital Signal Processor, DSPs） 是指一類具有專門為完成數(shù)字信號處理任務而優(yōu)化設(shè)計的系統(tǒng)體系結(jié)構(gòu)、硬件和軟件資源的 單片可編程處理器件 。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 14 Four frames from highspeed video sequence. “ Vision Research, Inc., Wayne, NJ., USA. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 12 Examples of signals. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 12 Examples of signals. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 14 Four frames from highspeed video sequence. “ Vision Research, Inc., Wayne, NJ., USA. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。數(shù)字信號處理器是實現(xiàn)數(shù)字信號處理任務的一個重要而有效的手段。 反過來 ， 數(shù)字信號處理的 應用又促進了 數(shù)字信號處理 理論的提高 ?？梢院敛豢鋸埖卣f， DSP芯片的誕生及發(fā)展對近幾十年來通信、計算機、控制等領(lǐng)域的技術(shù)發(fā)展起到十分重要的作用。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 113 Signals and spectra. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 118 Continued. Joyce Van de Vegte Fundamentals of Digital Signal Processing Copyright 169。2022 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. FIGURE 124 Low pass filtering a piano chord Joyce Van de Vegte