Bi-phase code decoding system

Details Bi-phase code decoding system Bi-phase code decoding system

1997-05-20

1999-09-14

Tung, Bryan

Television

Bandwidth reduction system

386 33, 386112, 341 70, 375333, H04N 724

Patent

active

059530634

ABSTRACT:
A horizontal period counter 3 determines one bit period of bi-phase codes by measuring the period of a horizontal scan line immediately preceding one containing bi-phase codes to be decoded. An edge pulse generator 6 generates edge pulses at rising and falling edges of inputted bi-phase codes. A compensating pulse generator 7 is triggered by the edge pulse and generates a compensating pulse in a predetermined period, which is shorter than one bit period of the bi-phase codes and longer than one half bit period, according to one bit period that has been determined. A rise judging circuit 11 generates sampling pulses by superimposing compensating pulses on the edge pulses. The bi-phase codes are decoded according to the sampling pulses.

REFERENCES:
patent: 5185766 (1993-02-01), Cho
patent: 5617392 (1997-04-01), Shim

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