Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1988-02-17
1990-05-01
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
358133, H04N 1413
Patent
active
049225103
ABSTRACT:
A method and a device are disclosed for variable length coding and decoding of an information block of input signals, with the information being concentrated at the beginning of the block and the block being terminated by a continuous succession of zero words. Two code trees are utilized for coding and decoding the block. The first of the code trees is utilized for coding and decoding the first part of the block up to and including the word before the last non-zero and an end of the block character EOB, and the second code tree is specially designed for coding and decoding the last non-zero word. A switching device provides for switching between the two code trees and associated devices after the character EOB and before the last non-zero word.
REFERENCES:
patent: 4125861 (1978-11-01), Mounts et al.
patent: 4541012 (1985-09-01), Tescher
patent: 4677671 (1987-06-01), Galand et al.
patent: 4706265 (1987-11-01), Furukawa
"Scene Adaptive Coder" by Wen-Hsiung Chen and William K. Pratt, IEEE Transactions on Communications, vol. Com32, No. 3, Mar. 1984.
"VLC Set Proposal for n.times.384kbits/s" by CCITT Study Group XV, Working Part XV/1, Specialists Group on Coding for Visual Telepony, Draft Document #122, Jun. 1986.
Safourek Benedict V.
Televerket
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