Decoding binary-coded transmissions

Details Decoding binary-coded transmissions Decoding binary-coded transmissions

1991-01-10

1992-07-28

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 76, 329313, 34082563, H03K 908

Patent

active

051346320

ABSTRACT:
A biphase-mark coded digital audio signal comprising short and long pulses (IEC 958) is decoded despite substantial variation of sample rate but without a separate synchronization or timing signal and without a phase locked loop. The pulse lengths are measured and then compared with two thresholds. One is a variable threshold which is 1.5 times the average length of the short pulses, this average being stored in a register. This will normally be adequate to discriminate the short and long pulses. The second comparison is with a fixed value which is lower than 1.5 times the pulse length at the highest input frequency. When the comparators disagree irreconcilably in their determination, the resultant of the second comparison is used instead of the first. This allows the system to respond quickly to start-up or sudden change in input data rate.

REFERENCES:
patent: 4034340 (1977-07-01), Sant'Agostino
patent: 4479266 (1984-10-01), Eumurian et al.
patent: 4571547 (1986-02-01), Day
CCIR Recommendation 647, 1986. pp. 311-320.

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