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Analogue and Digital Communication Techniques - download pdf or read online

By Grahame Smillie

ISBN-10: 0340731257

ISBN-13: 9780340731253

The fast growth of electronic communications, rather within the fields of television and cellular phones doesn't overide the necessity for a transparent knowing of analogue frequencies. additionally, analogue expertise will play a huge function in communications good into the twenty first century.

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Extra resources for Analogue and Digital Communication Techniques

Sample text

Firstly, the products of modulation for amplitude modulators are shown very clearly by means of line graphs in this chapter. The line graph is also used to describe the concepts behind frequency division multiplexing. Practical modulators produce products of modulation that are different to the theoretical model. The necessity for things such as single sideband transmission with suppressed carrier on high-quality media is explained and the resultant advantages that this gives. Secondly, the principle of frequency modulation is necessary as this modulation technique is used extensively in microwave and satellite systems.

9 Signal suppression: an FM receiver can suppress the weaker of two signals simultaneously received at or near the same frequency. 9 Dynamic range: the FM system has a larger dynamic range than the AM system. 9 Angle modulation 43 ~c -4) c +~c I I I Large-amplitude low-frequency signal --~c ~c +~c Small-amplitude low-frequency signal "(1)c i ~c , +(l)c ! i Large-amplitude high-frequency signal Fig. 14 Phase modulation However, frequency modulation also has some significant disadvantages: a frequency modulator is more complex than an amplitude modulator.

This system has a channel capacity of 2700 channels. 5 shows the line graph for the 12 MHz FDM system described above. Notice the sideband inversion due to the LSB being selected at the output of each stage, and being passed to the next stage. 6 MODULATION DEPTH The modulation depth, sometimes referred to as the modulation index, is normally measured as a percentage. The modulation depth is a measure of the efficiency of the modulator. All modulators must be protected from overmodulation, which Modulation depth 29 occurs when the input signal becomes too large.

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Analogue and Digital Communication Techniques by Grahame Smillie


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