Method and apparatus for multiplexing and transmitting autonomously/intra coded pictures along with the main or I, P, B pictures/video
First Claim
1. A transmitter comprising:
- means for generating a main elementary video stream that includes autonomously encoded pictures and predictively encoded pictures;
means for selecting from the main elementary video stream only the autonomously encoded pictures;
means for arranging the autonomously encoded pictures to generate an ancillary elementary video stream;
means for multiplexing the main elementary video stream and the ancillary elementary video stream to generate a transport stream; and
,means for transmitting the transport stream wherein the transport stream is transmitted over a transmission channel to a receiver that is located remotely from the transmitter.
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Abstract
A device for deriving an ancillary signal from a compressed digital video signal (e.g. MPEG), wherein the ancillary signal includes selected parts of the main signal, for example, the DC coefficients of I-pictures, or the unscrambled parts, which parts 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, is described. 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. A decoding method is also described.
57 Citations
22 Claims
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1. A transmitter comprising:
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means for generating a main elementary video stream that includes autonomously encoded pictures and predictively encoded pictures; means for selecting from the main elementary video stream only the autonomously encoded pictures; means for arranging the autonomously encoded pictures to generate an ancillary elementary video stream; means for multiplexing the main elementary video stream and the ancillary elementary video stream to generate a transport stream; and
,means for transmitting the transport stream wherein the transport stream is transmitted over a transmission channel to a receiver that is located remotely from the transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 20)
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8. A receiver, comprising:
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means for receiving a transport stream that includes multiplexed main and ancillary elementary video streams; means for de-multiplexing the main and ancillary elementary video streams to generate separate main and ancillary elementary video streams; and
,wherein the main elementary video stream includes autonomously encoded pictures and predictively encoded pictures, and the ancillary elementary video stream includes only autonomously encoded pictures from the main elementary video stream. - View Dependent Claims (9, 10, 11, 12, 13, 14, 21)
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15. A system, comprising:
a transmitter that includes; means for generating a main elementary video stream that includes autonomously encoded pictures and predictively encoded pictures; means for selecting from the main elementary video stream only the autonomously encoded pictures; means for arranging the autonomously encoded pictures to generate an ancillary elementary video stream; means for multiplexing the main elementary video stream and the ancillary elementary video stream to generate a transport stream; and
,means for transmitting the transport stream; and
,a receiver that includes; means for receiving the transport stream; and
,means for de-multiplexing the main and ancillary elementary video streams to generate separate main and ancillary elementary video streams. - View Dependent Claims (16, 17, 18, 22)
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19. A method, comprising:
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generating a main elementary video stream that includes autonomously encoded pictures and predictively encoded pictures; selecting from the main elementary video stream only the autonomously encoded pictures; arranging the autonomously encoded pictures to generate an ancillary elementary video stream; multiplexing the main elementary video stream and the ancillary elementary video stream to generate a transport stream; and
,transmitting the transport stream over a transmission channel to a receiver that is located remotely from the transmitter.
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Specification