Transmission system implementing different coding principles

Details Transmission system implementing different coding principles Transmission system implementing different coding principles

1994-10-11

1998-09-15

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

395 2, H03M 700

Patent

active

058085696

ABSTRACT:
A transmission system for encoded transmission of audio signals with frequency band compression. An input signal to be transmitted is divided into two spectral portions in a coder. One spectral portion is digitally encoded by a time-domain coder, and the other spectral portion is coded by a transform domain coder. The two digitally coded signals are then multiplexed for transmission as a composite digitally coded signal to a receiver. At the receiver the composite signal is demultiplexed and the two spectral portions thereof are respectively decoded by a time-domain decoder and a transformer-domain decoder. The decoded signals, covering the respective spectral portions, are then combined to reconstitute the originally transmitted audio signal.

REFERENCES:
patent: 4811398 (1989-03-01), Copperi et al.
patent: 4933957 (1990-06-01), Bottau et al.
patent: 4949383 (1990-08-01), Koh et al.
patent: 5001758 (1991-03-01), Galand et al.
CCITT Recommendation G.728 "Coding of speech at 16 kbit/s using low delay code excited linear prediction".
Draft International Standard ISO/IEC DIS 11172 "Information technology--Coding of moving pictures associated audio for digital storage media up to about 1.5 Mbit's", section 3, pp. 174-337.

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