Multichannel common clock

Details Multichannel common clock Multichannel common clock

1981-05-11

1984-02-21

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

371 61, 360 51, H04L 702

Patent

active

044334249

ABSTRACT:
A clocking system is disclosed for a multichannel data transmission system which includes a temporary storage medium, such as magnetic tape. The system is an improvement over prior art systems which utilize a separate phase locked loop clock correction circuit for each channel. The described system utilizes a single clock for the multiple channels which operates at a frequency F that is an integral multiple of the channel baud rate. Means are provided to continually monitor the phase error of each channel and a composite correction signal is derived and applied to the clock signal which is proportional to the average of the phase errors of the individual channels.

REFERENCES:
patent: 3036157 (1962-05-01), Franco
patent: 3204035 (1965-08-01), Ballard
patent: 3238462 (1966-03-01), Ballard et al.
patent: 3787665 (1974-01-01), Watson et al.
patent: 3859466 (1975-01-01), Hartmann
patent: 4002839 (1977-01-01), Karl et al.
patent: 4074080 (1978-02-01), Dragotinov et al.
patent: 4144448 (1979-03-01), Pisciotta et al.

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