Counter circuit operable in synchronism with frame or digital da

Details Counter circuit operable in synchronism with frame or digital da Counter circuit operable in synchronism with frame or digital da

1984-10-10

1987-02-03

Olms, Douglas W.

Pulse or digital communications

Spread spectrum

Direct sequence

360 51, H04L 700

Patent

active

046413260

ABSTRACT:
There is provided a counter circuit operable in synchronism with a frame of a digital data signal of a digital audio system even if a frame synchronization signal is not detected. The counter circuit comprises a detection circuit for detecting the frame synchronization signal of the digital data signal to produce a frame synchronization detection signal. A series of counters repeatedly count clock pulses reproduced from the digital data signal to produce a count signal when the count of the series of counters reaches a value corresponding to the number of channel bits includes in one (1) frame of the digital data signal. A reproduction frame sychronization signal is generated in response to the frame synchronization signal when the count of the series of counters is within a predetermined range, the reproduction frame synchronization signal resetting the counters. The reproduction frame synchronization signal is also generated in response to the count signal when the count of the series of counters is within the predetermined range and when the frame synchronization detection signal is not outputted from the frame synchronization signal detection circuit, the reproduction frame synchronization signal resetting the counters.

REFERENCES:
patent: 3865981 (1975-02-01), Welch et al.
patent: 4275466 (1981-06-01), Yamamoto
patent: 4477842 (1984-10-01), Kaneko
patent: 4479230 (1984-10-01), Auzet et al.

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