Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1997-01-24
1998-05-26
Ghebretinsae, Temesghen
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
348384, 382232, H04B 166
Patent
active
057578524
ABSTRACT:
A method of compressing digital signals for transmission and/or storage. The method includes lossy compressing the digital signal to generate a lossy compressed signal. The compressed signal is decompressed locally to generate a local lossy decompressed signal. An error signal is calculated as the difference between the original digital signal and the local lossy decompressed signal. The power in the original digital signal and in the error signal is determined. A minimum resolution for quantizing the error signal is determined from a ratio of the power of the original signal with respect to power of the error signal. The error signals is lossy compressed by quantizing to at least the minimum resolution. Both the compressed digital signal and the compressed error signal are transmitted and/or stored. The lossy compressed error signal and the lossy compressed signal are recovered from storage or transmission. The lossy compressed signal and the lossy compressed error signal are decompressed, and the decompressed lossy compressed original signal and the decompressed lossy compressed error signal are summed to generate the recovered original digital signal.
REFERENCES:
patent: 4903317 (1990-02-01), Nishihara et al.
patent: 5432871 (1995-07-01), Novik
"Image Compression Methods With Distortion Controlled Capabilities" Markas et al. IEEE, pp. 93-101, 1991.
Jericevic Zeljko
Sitton Gary A.
Fagin Richard A.
Ghebretinsae Temesghen
Western Atlas International Inc.
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