Circuit for digital phase difference measuring and synchronizing

Details Circuit for digital phase difference measuring and synchronizing Circuit for digital phase difference measuring and synchronizing

1983-06-30

1984-09-11

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 79D, 307269, 328133, G01R 2500

Patent

active

044712995

ABSTRACT:
A circuit for digitally evaluating the magnitude of the phase error between a reference and a locally generated train (sequence) of pulses. The reference train (sequence) may be, for example, the received horizontal sync pulse in a television receiver and the locally generated synchronizable horizontal trigger of the receiver. The reference pulse train (sequence) contains statistical noise and noise pulses and by multiple phase error sampling (digital) and averaging a much more accurate phase error measurement is obtained. Circuits for directly synchronizing the local trigger generator from the measured phase error are also included.

REFERENCES:
patent: 2980858 (1961-04-01), Grondin et al.
patent: 3297947 (1967-01-01), Riordan et al.
patent: 3820022 (1974-06-01), Watt
patent: 3930199 (1975-12-01), Valis
patent: 4001682 (1977-01-01), Watt

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