Digital speech/data discriminator for transcoding unit

Details Digital speech/data discriminator for transcoding unit Digital speech/data discriminator for transcoding unit

1982-02-23

1984-06-26

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

370 83, 381 31, G10L 100

Patent

active

044570139

ABSTRACT:
A digital transcoding unit receiving incoming PCM-coded speech and data samples to be distributed after selective quantization to different outgoing channels, with fewer quantizing bits assigned to speech samples than to data samples, includes a discriminator distinguishing among speech samples, high-rate data samples and low-rate data samples on the basis of bandwidth and number of zero crossings. Low-rate data samples are directed by the discriminator to outgoing speech channels, rather than data channels, for more efficient transmission-line utilization.

REFERENCES:
patent: 4237552 (1980-12-01), Aikoh et al.
patent: 4303803 (1981-12-01), Yatsuzuka
Article by Jean-Pierre Adoul & Daniel Pradelles entitled "On Line Speech/Data-Modem Identifier for Telephone Network", published in 1977 (Hartford, CT) Reports of IC ASSP, pp. 332-335.
Article by Yohtaro Yatsuzuka entitled "A High-Gain DSI-ADPCM System", published in 1979 (Washington, D.C.) Reports of IC ASSP, pp. 436-441.

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