Television – Bandwidth reduction system – Data rate reduction
Patent
1995-04-21
2000-06-27
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348414, 348422, 375245, H04N 712, H04N 1102, H04N 1104
Patent
active
060812958
ABSTRACT:
The coding or decoding of video data with the associated audio and/or other data can be performed, for example, on the basis of the standards ISO/IEC 11172 (MPEG1) or ISO/IEC 13818 (MPEG2). Such coding and decoding can include the conversion of a primary bit stream coded on the basis of such standards into a secondary bit stream with a different data rate. Since the information content of the motion vectors from the primary bit stream retain their validity in the secondary bit stream, it is not necessary to recalculate motion vectors for transcoding. Instead, encoding of the secondary bit stream is performed with the aid of the motion vectors from the primary bit stream which are reused. In such a case, the encoding of the secondary bit stream is carried out in a restricted prediction mode, i.e. only those prediction modes which are described by respective block type or the motion information of the primary bit stream are allowed in the secondary bit stream.
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copy of German search report from Germany & Austria.
Draft Revision of Recommendation H.261:Video Codec for Audiovisual Services At 1/2 .times.64 kbit/s-- Dec. 1, 1989.
The Digital Hierarchy--A Blueprint for Television in the 21st Century--Reitmeier et al.--SMPTE Journal, Jul. 1992.
Adolph Dirk
Herpel Carsten
Hutter Ingo
Westerkamp Dietrich
Chin Tommy P.
Deutsche Thomson-Brandt GmbH
Diep Nhon T.
Emanuel Peter M.
Tripoli Joseph S.
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