By Grahame Smillie
The swift growth of electronic communications, rather within the fields of television and cellular phones doesn't overide the necessity for a transparent realizing of analogue frequencies. additionally, analogue know-how will play a tremendous function in communications good into the twenty first century.
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Extra resources for Analogue and Digital Communication Techniques
The symbol for the modulator is shown in Fig. 2. Notice that the arrow points in the direction of the propagation of the information. , ! -" ! i - +2 +1 . -'" ! /, ,, ; '! I 1 I 2 I 3 , ' i ! I ' LS. i ! ! 4 kHz . . . 3 kHz " ,i 4 ' ! I 5 6 , ...... S, 7 i i ,8 ' ! 7 kHz . . . 6 kHz us. 4 kHz . . 3 kHz ! | Line graph Fig. 2 Line graphs for double sideband transmission The lower sideband is determined by the following: LSB = Ifc-fa[ The modulus is taken so as to produce a positive result.
It is also necessary to understand the demodulation process and demodulators. 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.
3 Sideband transmission The example shown in Fig. 2 is for double sideband (DSB) transmission. Double sideband transmission is wasteful of the frequency spectrum as the same information is carried in the USB and the LSB. In practice, on very good media only one of the sidebands is sent, and this is known as single sideband (SSB) transmission. 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.