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Dual adaptive delta modulation for mobile voice channel and its DSP implementation

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2 Author(s)
Nakatsui, M. ; Radio Research Laboratories, Ministry of Posts and Telecommunications, Tokyo, Japan ; Nakata, K.

The objective of our work reported in this paper is to design a dual adaptive delta modulation (DADM) that can 1) transmit fairly good quality speech (as high as communications quality) at 16 kbps, 2) produce a graceful degradation in speech quality in the presence of channel bit errors of up to 1 percent, and 3) be implemented with a small-sized and economical digital hardware. Presented are: 1) basic characteristics of the algorithm proposed, including subjective assessment of voice quality, 2) optimization of system parameters using speech samples spoken by 4 males and 4 females, and 3) hardware realization of the DADM using a DSP and a PCM-Codec LSI chips for full-duplex operation.

Published in:

Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '85.  (Volume:10 )

Date of Conference:

Apr 1985