Data compression unit control for alignment of output signal
First Claim
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1. A method of controlling a compression unit which outputs a compressed bitstream in packets, the method comprising. supplying to a reference input of the compression unit, a transport stream input with a sequence of transport packets;
- supplying to a second input of the compression unit an input to be compression coded; and
nominating a set of the transport packets as reference packets and arranging for the compression unit to compression code the input and output the compression coded bit-stream in packets that are in alignment with the reference packets.
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Abstract
To enable a single programme in a multiple programme MPEG transport stream (MPTS) to be replaced seamlessly by a locally generated programme, the local coder receives the MPTS as a reference signal and outputs transport packets in alignment with the packets of the programme to be replaced. Timing and other packet parameters are also copied.
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Citations
32 Claims
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1. A method of controlling a compression unit which outputs a compressed bitstream in packets, the method comprising.
supplying to a reference input of the compression unit, a transport stream input with a sequence of transport packets; -
supplying to a second input of the compression unit an input to be compression coded; and
nominating a set of the transport packets as reference packets and arranging for the compression unit to compression code the input and output the compression coded bit-stream in packets that are in alignment with the reference packets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of replacing a programme within a multi-programme transport stream by the output of a programme compression unit, the method comprising:
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supplying to the compression unit the multi-programme transport stream and a programme input;
nominating as reference packets those packets which are associated with the programme to be replaced;
arranging for the compression unit to compression code the programme input and output the encoded programme stream in packets in alignment with the reference packets; and
re-multiplexing the output of a the programme compression unit with the remaining packets of the multi-programme transport stream. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. Apparatus for replacing a programme within a multi-programme transport stream by the output of a programme compression unit, the apparatus comprising:
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a compression unit having a reference input and a programme input;
means for supplying the multi-programme transport stream to said reference input and a programme input to said programme input, and nominating as reference packets those packets which are associated with the programme to be replaced;
the compression unit being arranged to compression code the programme input and output the encoded programme stream in packets in alignment with the reference packets; and
a re-multiplexer for re-multiplexing the output of the programme compression unit with the multi-programme transport stream. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A method of controlling a plurality of compression units which each output a compressed bit-stream, the method comprising:
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supplying to a reference input of each of the compression units, a transport stream input with a sequence of transport packets;
supplying to a second input of each compression unit an input to be compression coded; and
nominating a different set of the transport packets as reference packets for each of the respective compression units and arranging for each compression unit to compression code the input for that compression unit and output the encoded programme stream in packets in alignment with the reference packets nominated for that compression unit. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32-34. -34. (canceled)
Specification