Television – Bandwidth reduction system – Data rate reduction
Patent
1994-11-29
1997-02-25
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
H04N 730
Patent
active
056063717
ABSTRACT:
A device for encoding a video signal comprises a picture transformer (22), a quantizer (23) and a variable-length encoder (24), as well as distribution device (6) for distributing a global target value (T) for the number of bits per picture or group of pictures in local target values (T.sub.n) for separate macroblocks of each picture. The device for encoding is provided with proportionally integrating control device for for controlling the quantization step size (Q.sub.1) in such a way that the buffer contents (b) of an output buffer (4) are in conformity with the target value. Since the PI control circuit does not introduce any residual errors, the desired number of bits per picture or group of pictures is achieved within narrow limits. The output signal is eminently suitable for recording and subsequent editing.
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MPEG 2 Test Model 5, ISO/IEC JTC1/SC29/WG11/N0400, Apr. 1993.
Herbert Holzlwimmer, Walter Tangler, Achim V. Brandt; "A New Hybrid Coding Technique for Videoconference Applications at 2 MBIT/S" SPIE vol. 594 Image Coding (1985) pp. 250-259.
"Hardware Implementation of the Framestore and Datarate Control for a Digital HDTV-VCR", a discourse held at the HDTV Symposium, in Japan, Nov. 1992.
"Coding of moving pictures and associated audio for digital storage media up to about 1.5 Mbit/s", ISO/IEC IS 11172.
"A New Hybrid Coding Technique for Videoconference Applications at 2 Mbit/s" SPIE vol. 594 Image Coding (1985).
Keesman Gerrit J.
Klein Gunnewiek Reinier B. M.
Shah Imran A.
Chin Tommy P.
Gathman Laurie E.
Tung Bryan S.
U.S. Philips Corporation
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