New PDF release: Analogue and Digital Communication Techniques

By Grahame Smillie

ISBN-10: 0340731257

ISBN-13: 9780340731253

The swift enlargement of electronic communications, relatively within the fields of television and cellular phones doesn't overide the necessity for a transparent realizing of analogue frequencies. in addition, analogue know-how will play a massive function in communications good into the twenty first century.

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Extra resources for Analogue and Digital Communication Techniques

Sample text

A carrier frequency of 108 kHz is reintroduced to the demodulator. Determine the following: 1. The LSB and USB at the output of the modulator. 2. The LSB and USB at the output of the demodulator. Solution 1. 7 kHz This is shown in Fig. 3. 2. 4 kHz. 7 kHz. 4 kHz is yielded. 4 kHz results. The USB that results when the USB from the transmitter is demodulated is a frequency range beyond human heating and of such a high frequency that it will not be able to propagate down the telephone cable pair effectively.

On large-capacity point-to-point systems the carrier frequency is suppressed at the transmitter and reintroduced at the receiver. This means that only the one sideband is transmitted over the media. This method of transmission is illustrated in Fig. 3. Notice that this filter at the output of the modulator either selects the USB or the LSB. 4 kHz . . 3 kHz ! ! [ 3 : I 4 I 5 I 6 I 7 I 8 I 9 I 10 I I 11 12 I1 12 I 11 12 Frequency band at point A fc ! I 0 I 1 2 3 4 I 0 I 1 I 2 I 3 I 4 ! 3 kHz Frequency band at point B ,,, I ~- - I I I ' 5 6 7 :!

Each method has advantages and disadvantages, and some methods are easier to implement than others. Some modulation techniques favour one type of medium rather than another type. All the different modulation techniques can be classified under the following main headings: 1. Amplitude modulation schemes. 2. Angle modulation schemes composed of: (a) Frequency modulation. (b) Phase modulation. 3. Composite modulation schemes composed of: (a) Pulse position modulation. (b) Pulse width modulation. (c) Pulse amplitude modulation.

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Analogue and Digital Communication Techniques by Grahame Smillie


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