July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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8 Bandwidth requirements
and modulation
8.1 Bandwidth of signals at base band
8.1.1 Analogue signals
The amount of information and the speed at which it is transmitted
determines the base bandwidth occupied by a signal. For analogue
signals, the base bandwidth is the range of frequencies contained in
the signal; it is not the same as that occupied by a radio frequency
carrier modulated by the signal. Examples of base bandwidths are
given in Table 8.1.
Table 8.1 Base bandwidths
Application Frequency range
(Hz)
Speech
High fidelity reproduction 15–15 000
Good fidelity 150–7000
Public address 200–5000
Restricted bass and treble 500–4000
Toll quality (good quality ...
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