Selection of a PCM coder for digital switching

Selection of a coder for digitizing speech and subsequent processing inside a digital switch is virtually dictated by existing analog and digital trunks with which the switch is to interface, by system requirements on signal-to-noise ratio (SNR), idle channel noise (ICN), dynamic range (DR), and by...

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Bibliographic Details
Published in:IEEE transactions on acoustics, speech, and signal processing speech, and signal processing, 1980-10, Vol.28 (5), p.545-550
Main Authors: Shenoi, K., Agrawal, B.
Format: Article
Language:English
Subjects:
Degradation
Digital signal processing
Noise measurement
Phase change materials
Pulse modulation
Quantization
Signal to noise ratio
Speech
Switches
Telephony
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Summary:Selection of a coder for digitizing speech and subsequent processing inside a digital switch is virtually dictated by existing analog and digital trunks with which the switch is to interface, by system requirements on signal-to-noise ratio (SNR), idle channel noise (ICN), dynamic range (DR), and by CCITT specifications. To facilitate the selection, this paper compares four coders, namely, 13-bit and 14-bit uniform (linear), A-law 1 , and μ-law 2 coders on the basis of SNR, ICN, DR, and the distortion introduced by code conversions-from linear to companded and vice versa. It is shown that a 13-bit midtread coder outperforms both A-law and μ-law coders and that it is a good choice for digital switching systems.
ISSN:0096-3518
DOI:10.1109/TASSP.1980.1163443