Coded transmission system with initializing code

Details Coded transmission system with initializing code Coded transmission system with initializing code

1990-05-29

1992-02-04

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375108, 341 73, H04L 100, H04L 2532

Patent

active

050864360

ABSTRACT:
A coded transmission system wherein each bit of transmitted data having a logical value is coded depending on a coded result of a preceding bit. The coded transmission system contains a sender-side apparatus, a transmission line, and a receiver-side apparatus. In the sender-side apparatus, a resetting bit and a message are generated; a code of a bit last transmitted which is necessary to code a bit which is to be transmitted next is memorized in a first preceding code memorizing circuit; and the content of the first preceding code memorizing circuit is reset to an initial code responding to the resetting bit. A coding circuit receives the resetting bit and the message, codes each bit of the message in accordance with a predetermined coding rule and the content of the first preceding code memorizing circuit, and codes the resetting bit to a predetermined resetting code which is different from the codes used in the coding of the message. In the receiver-side apparatus, a code of a bit last received which is necessary to decode a code of a bit which is received next is memorized in a second preceding code memorizing circuit. A resetting circuit resets a content of a second preceding code memorizing circuit to a predetermined initial code when receiving the resetting code. A decoding circuit decodes the received codes corresponding to the message in accordance with the predetermined coding rule and the content of the second preceding code memorizing circuit.

REFERENCES:
patent: 4337457 (1982-06-01), Tache
patent: 4442528 (1984-04-01), Fukuda
patent: 4503546 (1985-03-01), Yoshine et al.
patent: 4562422 (1985-12-01), Pospischill
patent: 4644546 (1987-02-01), Doi et al.
patent: 4651328 (1987-03-01), Den Hollander et al.
patent: 4837782 (1987-06-01), Sasaki
patent: 4873524 (1989-10-01), Akkermans

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