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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than coding short samples of voice signal. The code is calculated by
looking at the long-term changes in the voice and then predicting how
the voice pattern will change. Since the pattern takes some time to
establish, CELP codecs produce a delay.
A backward adaptive CELP codec was standardized in 1992 as
G728. This codec uses backward adaptation in its calculations. This
means that, rather than buffer 20 ms or so of the input speech for its
calculations, the pattern of previous speech is used. This means that
the G728 codec has to analyse fewer samples than traditional CELP
codecs. The G728 codec uses only 5 samples giving it a total delay
of less than 2 ms.
14.5 The GSM codec
The ‘Global System for Mobile communications’ (GSM) is a digital
mobile
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