Long term response enhancement for digital phase-locked loop

Details Long term response enhancement for digital phase-locked loop Long term response enhancement for digital phase-locked loop

1981-04-07

1983-08-02

Smith, Jerry

Boots, shoes, and leggings

328 55, 328155, 364484, G06F 1520, H03B 304

Patent

active

043969917

ABSTRACT:
A long term response enhancement for a digital phase-locked loop is implemented to provide a relatively minor change in the phase of the output signal over a relatively long period of time. The basic digital phase-locked loop determines the average number of pulses from a clock source which occur or are expected to occur between successive occurrences of the input signal to the digital phase-locked loop, and compares the number of pulses counted from the occurrence of the last output signal with the average number of pulses expected to occur between successive input signals, producing an output signal when the two numbers agree. The present invention modifies the average count prior to comparison with the number of pulses counted from the occurrence of the last output signal, by adding a one or a zero to the average count, based upon comparison of the previous two averages present during the previous two cycles of the input signal with the current average, with either a one or a zero added to the comparison number, thereby providing for slight modification of the time at which the output signal would be produced.

REFERENCES:
patent: 3878473 (1975-04-01), Furtney, Jr.
patent: 3889186 (1975-06-01), Larson
patent: 3983498 (1976-09-01), Malek
patent: 4131856 (1978-12-01), Chapman

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