By Robert G. Winch
ISBN-10: 007070970X
ISBN-13: 9780070709706
ISBN-10: 0071369503
ISBN-13: 9780071369503
The hot variation of this bestselling consultant comprises all of the info had to grasp the evergrowing complexities of up to date electronic transmission gear. Encompassing the entire scope of the sector, this booklet has the solutions for engineers looking to layout and enforce high-performance telecommunications. It covers multiplexing, microwave radio, fiber optics, satellite tv for pc, state-of-the-art electronic mobile, and computers platforms, web and intranet transmission structures, and extra, all with a certified instead of theoretical concentration. A quantity within the McGraw-Hill sequence on Telecommunications.
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Extra info for Telecommunication Transmission Systems, 2nd Edition
Example text
The objective of all these compression techniques is to maintain toll-quality speech as experienced in a regular PSTN connection. It is highly probable that bit rates less than 1 kb/s will be used in future cellular systems. 32 Chapter Two The main problem with all of these coding techniques that remove redundancies and/or predict the future amplitude of various frequency components of the speech spectrum is delay time caused by the algorithm. Excessive delay is often perceived as an echo by the listener.
The method used for encoding is as follows: At the beginning of each encoding period, the first bit is assumed to be a 1 if the sample is positive, and 0 if it is negative. The sample is then compared with an analog reference voltage corresponding to half of the maximum level. , B2 = 1). , B2 = 0). 6 DECODER & CODER (b) EXPANDER Compression ϩ expansion ϭ linear result. IN (c) RESULT VOICE Digital Multiplexing 29 have been determined. At the end of the comparison, the code word corresponding to the sample amplitude is directly available at the output of the circuit controlling the reference voltages.
If the signal consists of a 10101010 sequence, the dc component will be V/2. Depending on the signal, the dc component can assume any value from 0 (all 0) to V volts (all 1). The spectrum of the NRZ code is as shown in Fig. 13. The fundamental frequency occurs at half the clock frequency f, and only the odd harmonics are present. Furthermore, there is no signal amplitude at the clock frequency, so it is difficult to extract the clock frequency at the receiving end. Also, during transmission via wirecable, if the noise peaks are summed up so that a 0 is simulated as 1, it is impossible to detect the error.