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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A sophistication which renders the speech more secure divides
the speech band into sections and transmits them separately using
a different key frequency for each band (audio frequency hopping).
The divisions of the speech band may also be treated as blocks and
transposed in time according to a user-programmable pattern to create
further confusion in the mind of the eavesdropper.
The most up-to-date methods of speech scrambling convert the
speech into digital form by either pulse code modulation (PCM) or
some other method. The digits corresponding to the speech may then
be either transmitted as frequency modulation, e.g. FFSK, on an ana-
logue radio system or, possibly after further encryption, transmitted
directly on a digital system. Digitized speech ...
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