Two-part synchronization scheme for digital video decoders
DCFirst Claim
1. A signal decoding system comprising:
- a first synchronizing means, having an input coupled to a transmission channel, for synchronizing to a variable bit-rate coded signal received from said input, and for parsing a portion of said variable bit-rate coded signal;
a buffer having an input coupled to an output of said first synchronizing means;
a decoder, coupled to an output of said buffer, for decoding said portion of said variable bit-rate coded signal; and
a second synchronizing means, disposed between said buffer and said decoder, for parsing said portion of said variable bit-rate coded signal.
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Abstract
A novel synchronization scheme for use in connection with digital signal video decoder comprises a pre-parser, a channel buffer, and a post-parser. The pre-parser synchronizes to a multiplexed system bitstream received from a fixed rate channel. The video bitstream component of a multiplexed system bitstream is then extracted and synchronized prior to being transferred bit-serially from the pre-parser to a channel buffer. The post-parser is coupled to the channel buffer and to a video decoder in a series configuration. The post-parser separates the various layers of video data from the video bitstream component. The post-parser performs a translation operation on the video bitstream component and converts the bitstream data into symbol data. The symbol data is subsequently processed by the video decoder so as to reconstruct an originally encoded picture or frame. Preferably, the multiplexed system bitstream data structure conforms to some format agreed upon among video digital businesses involved in transmission and reception. In accordance with one aspect of the present invention, the pre-parser and the post-parser operate independent of each other, and operate at different processing rates.
174 Citations
30 Claims
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1. A signal decoding system comprising:
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a first synchronizing means, having an input coupled to a transmission channel, for synchronizing to a variable bit-rate coded signal received from said input, and for parsing a portion of said variable bit-rate coded signal; a buffer having an input coupled to an output of said first synchronizing means; a decoder, coupled to an output of said buffer, for decoding said portion of said variable bit-rate coded signal; and a second synchronizing means, disposed between said buffer and said decoder, for parsing said portion of said variable bit-rate coded signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A signal decoding system comprising:
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a first synchronizing means for receiving a multiplexed bitstream from a transmission channel, said multiplexed bitstream comprising at least an audio bitstream and a video bitstream; means, coupled to said first synchronizing means, for parsing a video bitstream from said multiplexed bitstream; a channel buffer, coupled to said parsing means, receiving said video bitstream; a second synchronizing means, coupled to said channel buffer, for further parsing said video bitstream; and a decoder, coupled to said second synchronizing means, for decoding said parsed video bitstream. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A process of decoding a bitstream comprising the steps of:
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receiving a multiplexed bitstream from a transmission channel, the multiplexed bitstream including at least a video bitstream; synchronizing to the received multiplexed bitstream; parsing the video bitstream from the synchronized multiplexed bitstream; transferring the video bitstream to a channel buffer; further parsing the video bitstream; and - View Dependent Claims (26, 27, 28, 29, 30)
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Specification