Data communication having transmitter-controlled mode switching

Details Data communication having transmitter-controlled mode switching Data communication having transmitter-controlled mode switching

1992-06-12

1993-01-05

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

Adaptive coding

H03M 748

Patent

active

051774801

ABSTRACT:
A method of processing data for transmission from a transmitter (T) to a receiver (R) both of which are switchable between a compression mode in which the data stream is encoded or decoded with a data compression algorithm and a transparent mode in which the data stream is transmitted or received unencoded, comprising reading an input data stream at the transmitter (T), encoding at least part of the input data stream with the data compression algorithm to form a compressed data stream, monitoring the efficiency of compression of the compressed data stream and controlling the switching of the mode of the transmitter (T) and receiver (R) so that the input data stream is transmitted efficiently. In the transparent mode both the receiver and the transmitter check independently the efficiency of compression and switch to the compression mode if the transparent mode is determined to be inefficient. In the compression mode the transmitter (T) determines the efficiency of compression and transmits a control code to the receiver (R), switching both the receiver and transmitter to the transparent mode if the compression mode is determined to be inefficient.

REFERENCES:
patent: 3185824 (1965-05-01), Blasbalg et al.
patent: 3394352 (1968-07-01), Wernikoff
patent: 4509038 (1985-04-01), Hirano
Patent Abstracts of Japan, vol. 13, No. 186 (E-752) (3534), May 2, 1989; & JP, A, 112621 (NEC Corp.).

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