Apparatus for variable-length coding and variable-length-decodin

Details Apparatus for variable-length coding and variable-length-decodin Apparatus for variable-length coding and variable-length-decodin

1995-01-31

1996-06-18

Chin, Stephen

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

375253, 348390, H04B 166, H04B 1404, H04N 1102

Patent

active

055286283

ABSTRACT:
An apparatus for variable-length-coding input symbols using a plurality of variable-length-code tables includes N variable-length-code tables each having a symbol-codeword association different from the others according to statistics regarding the symbols and a variable-length-coding device for coding the input symbols according to each of the variable-length-code tables for every block in a predetermined block data unit, for generating codewords, and for providing both table information representing each of the variable-length-code tables utilized in generating the respective codewords and a control signal indicating that variable-length-coding to a predetermined block data unit has been completed. The apparatus also includes buffers which store the codewords generated by the variable-length-coding device, an optimum table determining device receiving the output codewords for controlling the buffer so as to output codewords with a minimum amount of data for the block data unit, for supplying the table information from the variable-length-coding device and for providing table selection information representing a variable-length-code table producing the minimum amount of data for an input block data unit. The apparatus further includes a first switching circuit which receives table selection information and codewords and respectively outputs data in response to the output control signal. The apparatus advantageously can improve data compression efficiency. A complementary decoder, which can be used in building a communication system, is also described.

REFERENCES:
patent: 4546342 (1985-10-01), Weaver et al.
patent: 4730348 (1988-03-01), MacCrisken
patent: 5226640 (1993-07-01), Puzey
patent: 5319457 (1994-06-01), Nakahashi et al.
patent: 5402244 (1995-03-01), Kim
patent: 5408501 (1995-04-01), Cornaby
patent: 5416604 (1995-05-01), Park

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