Arrangement for decoding digital video signals
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United States of America Patent
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May 25, 2004
Grant Date -
Apr 25, 2002
app pub date -
Dec 13, 1999
filing date -
Apr 14, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an arrangement for deriving an ancillary signal from a compressed digital video signal (e.g. MPEG). The ancillary signal comprises selected parts of the main signal, for example, the DC coefficients of I-pictures, or the unscrambled parts. The ancillary signal thus obtained can be used for display in a (multi-) picture-in-picture television receiver, or as an 'appetizer' in order to encourage the user to pay a subscription fee. The ancillary signal can separately be recorded in digital video recorders so as to assist the user in finding the beginning of a scrambled program on tape. The ancillary signal can also be generated at the transmitter end and transmitted at a low bit rate. A decoder for decoding such an ancillary signal is considerably simpler and less expensive than a full-spec MPEG decoder.
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