Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1997-04-09
1999-09-28
Chin, Stephen
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
375243, 375254, 375296, 381 13, 381 731, 381 941, 704500, 704227, 704229, H04B 166, H04B 1404, H04H 500
Patent
active
059600373
ABSTRACT:
The apparatus for encoding a plurality of digital information signals, having at least a first input unit for receiving a first digital information signal and a second input unit for receiving a second digital information signal. A signal combination unit combines the first and second digital information signal to generate a first combination signal. First and second data compression units compress the first and second digital information signal so as to obtain first and second data reduced digital information signals. First, second, and third masked threshold determining units determine first, second and third masked thresholds respectively from the first, second digital information signals and the combination signal respectively. A selection unit selects one masked threshold from the first and third masked threshold so as to obtain a first selected masked threshold. Preferably, the first selected masked threshold is the smallest of the first and third masked thresholds. The first data compression unit compresses the first digital information signal in response to the first selected masked threshold. A formatting unit combines the first and second data reduced digital information signals into a transmission signal for transmission via a transmission medium. The choice is made between at least two masked thresholds, including the masked threshold derived from the information signal itself and the masked threshold derived from another signal. The other signal may be a combination signal that includes the information signal.
REFERENCES:
patent: 4620311 (1986-10-01), Immink
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"A New Surround-Stereo-Surround Coding Technique" W. Ten Kate et al, J. Audio Eng. Soc. vol. 40, No. 5, May 1992, pp. 376-382.
"Matrixing of Bit Rate Reduced Audio Signals" W.R. Th. Ten Kate, P.M. Boers, A. Makivirta, J. Kuusama, K.E. Christensen, E. Sorensen, Proc. of the ICASSP, 1992, Mar. 23-26, San Francisco, pp. II-205--11-208.
ISO/IEC International Standard is 13818-3, Information Technology-Coding of Moving Pictures and Associated Audio, Part 3: Audio, May 10, 1994.
ISO/IEC International Standard is 11172-3, Information Technology-Coding of Moving Pictures and Associated Audio for Digital Storage Media at Up to About 1.5 MBITS/Pare 3: Audio, 1993.
Belk Michael E.
Chin Stephen
Deppe Betsy L.
U.S. Phillips Corporation
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