Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey.

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Presentation transcript:

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-1 Digital/data communications.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-2 American Standard Code for Information Interchange (ASCII).

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-3 The Extended Binary-Coded Decimal Interchange Code.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-4 The Baudot code.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-5 Baudot code examples.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-6 The Gray code.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-7 Block diagram of the PCM process.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-8 A sample-and-hold circuit.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-9 Generation of PAM.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-10 (a) Natural sampling; (b) flat-top sampling.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-10 (continued) (a) Natural sampling; (b) flat-top sampling.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-11 The sample frequency and input frequency relationship.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-12 PCM encoding. (From the November 1972 issue of the Electronic Engineer, with the permission of the publisher.)

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-13 PCM TV transmission: (a) 5-bit resolution; (b) 8-bit resolution.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-14 Voltage levels for a quantized signal.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-15 An example of 3-bit quantization.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-16 An example of 3-bit quantization with increased sample rate.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-17 Uniform (left) and nonuniform (right) quantization.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-18 Companding process.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-19  -law encoder transfer characteristic.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-20 PCM communication system.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-21 DAC input/output.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-22 Binary-weighted resistor DAC.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-23 R-2R ladder DAC.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure bit ramp analog-to-digital converter.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-25 Codec block diagram.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-26 Digital signal encoding formats.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-27 Coding for a zero (00) and a one (11) for a minimum distance, D min, of 2.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-28 A code message for a zero (000) and a one (111) with a minimum distance, D min, of 3.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-29 ASCII code for A with odd parity. Note that lsb b 1 is the first bit of the digital word transmitted.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-30 Serial parity generator and/or checker.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-31 LRC error detection.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-32 CRC code generator for an (n, k) cyclic code.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-33 CRC code generator for a (7, 4) cyclic code using a generator polynomial G(x) = x 3 + x + 1.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-34 A CRC divide circuit for the general form of G(x) = g 0 + g 1 x + g 2 x 2 + ··· + g r x r.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-35 A CRC divide circuit for G(x) = 1 + x + x 3.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-36 (a), (b) Passive implementations for a second-order low-pass Butterworth filter and (c) a plot of the frequency response.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-37 A second-order low-pass Butterworth active filter.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-38 The block diagram for a digital signal processing circuit.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-39 Input and output sequences for a second-order Iow-pass Butterworth filter at 3 frequencies: (a) 1000, (b) 2000 Hz, and (c) 500.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-39 (continued) Input and output sequences for a second-order Iow-pass Butterworth filter at 3 frequencies: (a) 1000, (b) 2000 Hz, and (c) 500.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-39 (continued) Input and output sequences for a second-order Iow-pass Butterworth filter at 3 frequencies: (a) 1000, (b) 2000 Hz, and (c) 500.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-40 Ideal square wave with 50 percent duty cycle.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-41 Illustration of noise on a pulse.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-42 Nonideal square wave.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-43 Effects of impedance mismatches: (a) impedance is too low; (b) impedance is too high (ringing); (c) impedance is matched.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-44 Effects of frequency on data pulses: (a) good pulses; (b) low- frequency attenuation; (c) high-frequency attenuation.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-45 A sample-and-hold circuit as implemented in Electronics Workbench TM Multisim.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-46 The oscilloscope traces for the sample-and-hold circuit.

Modern Electronic Communication 9th edition Jeffrey S. Beasley and Gary M. Miller Copyright ©2008 by Pearson Education, Inc. Upper Saddle River, New Jersey All rights reserved. Figure 8-47 The spectrum of a signal that contains aliased frequencies due to improper selection of the sampling frequency.