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Variable length image coding system

  • US 5,319,457 A
  • Filed: 09/09/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 09/09/1991
  • Status: Expired due to Term
First Claim
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1. A coding system for multiplexing multi-channel parallel data into single-channel data after variable-length coding and transmitting said single-channel data through a single coder buffer memory at a speed synchronized with that on a transmission path, comprising:

  • n coder sets each including a plurality of coders and for coding n-channel parallel data, said coders having different coding characteristics of which the codes are added to said data upon coding;

    a bit calculator for computing the amount of code generated from each of said coder sets and controlling so that the total amount of code generated over all channels falls within a predetermined range;

    n selectors for selecting the outputs of suitable ones of said coders in accordance with a control signal from said bit calculator;

    n sub-buffer memories for temporarily storing the outputs from said selectors;

    a multiplexer for multiplexing the outputs from said sub-buffer memories;

    a coder buffer memory for temporarily storing the output from said multiplexer in time series; and

    a rate controller for monitoring said coder buffer memory and controlling said coder sets,said bit calculator controlling said sub-buffer memories to supply their outputs to said multiplexer in time series.

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