H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/67
H04L 1/18 (2006.01) G06T 9/00 (2006.01) G11B 20/18 (2006.01) H03M 7/42 (2006.01) H03M 13/00 (2006.01) H04L 1/00 (2006.01)
Patent
CA 1265250
- 22 - ABSTRACT DATA COMPRESSION An adaptive system for binary data compression incorporating a coding scheme which is simple to implement, which limits codeword length and which can be implemented by software. Data compression is achieved by assigning four bit codes to the eight most frequently occurring characters in the data and eight or nine bit codes to the remaining characters wherein the code assignment is made according to a continuously updated evaluation of character frequency distribution. Run length encoding may be used in conjunction with this technique, to achieve further data compression. For transmission, error control protocols are applied to the compressed data where such protocols may include the use of forward error correcting (FEC) coding and an automatic repeat request (ARQ) system. The data may be transmitted using a burst error control system based on interleaving so that a single error correcting FEC coding can correct bursts of errors characteristic of a telephone system.
503120
Clark Alan Douglas
Hashim Abdullah Abdulmutlib
British Telecommunications Public Limited Company
G. Ronald Bell & Associates
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