Noise-immune master timing generator

Details Noise-immune master timing generator Noise-immune master timing generator

1978-06-02

1979-08-07

Griffin, Robert L.

Telegraphy

Systems

Printing

178 691, 307269, 328110, H03K 118

Patent

active

041639464

ABSTRACT:
A noise-immune master timing generator operable to produce timing signals synchronized with external reference signals and to maintain phase synchronization even in a noise environment. First and second gate signals of different time duration are derived from a counter chain of the master timing generator and examined with respect to the time of occurrence of an external reference signal.
If the reference signal is within the first gate signal, as occurs during normal, noise-free conditions, there is no adjustment of the counting chain to resynchronize the counting chain to the reference signal. If the reference signal is outside of the first gate signal but within the second gate signal, representing a minor phase error condition, or if the reference signal is outside of both of the gate signals, representing a more serious error condition, the counter chain is resynchronized only if the next reference signal is also outside of the first gate signal, either outside of the first gate signal but within the second gate signal or outside of both gate signals. Various phase error signals are also produced indicative of the type and extent of phase error conditions.

REFERENCES:
patent: 3047841 (1962-07-01), Kondi
patent: 3069504 (1962-12-01), Kaneko
patent: 3472961 (1969-10-01), Wheeler et al.
patent: 3894246 (1975-07-01), Torgrim
patent: 3947634 (1976-03-01), Betts

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