By Grahame Smillie
The swift growth of electronic communications, really 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 position in communications good into the twenty first century.
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Extra resources for Analogue and Digital Communication Techniques
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 :! 7 kHz . . 3 kHz Frequency band at point C and D USB selected and suppressed carrier I 2 I 3 I 4 I 5 I 6 I 7 I Fig. 4 kHz is applied to an amplitude modulator. The USB and the LSB are both transmitted to the distant receiver, with a suppressed carrier. Receiver: the resultant USB and LSB from the transmitter are input to an amplitude demodulator.
But it must be remembered that space must be left on each side of the band to ensure that the filter can select the appropriate band from the complete frequency range. All the carrier frequencies and frequency bands are CCITT recommended. Since the time when the recommendations for F D M systems were laid down, CCITT has changed and become part of the ITU. 3 the LSB is selected at the output of each channel. The carder frequency is also suppressed, so the resultant band is 60 kHz to 108 kHz. Supergroup translation stage Channel translation stage r- 9 CH 1 ~,~,~z I ~,1o4~z I Group translation stage ~ 9 rGR 1 fc 1100 kHz I ~9~z SG 7 N ~ !
This table shows the advantages of using single sideband transmission. 2 Comparison of SSB and DSB Advantages of SSB Bandwidth Requires at most half the bandwidth of DSB for the same information. Allows better use of the available frequency spectrum. Power Requires less power than DSB, which leads to: Increased transmitter efficiency. Reduced amplifier distortion. 24 Analogue modulation principles the LSB at the input to the demodulator. The selection is based on the amount of noise in the two bands as well as the signal strength in the two bands.
Analogue and Digital Communication Techniques by Grahame Smillie