Self correcting time base for inaccurate oscillators

Details Self correcting time base for inaccurate oscillators Self correcting time base for inaccurate oscillators

1990-09-25

1993-12-21

Cosimano, Edward R.

Boots, shoes, and leggings

331 1A, 364569, 377 50, G06F 1520

Patent

active

052726509

ABSTRACT:
An apparatus and method for providing a microprocessor having an inaccurate oscillator with a desired time base. The cycles of the output signal of the oscillator are counted by a first counter until the counted number equals a predetermined correction count. The first counter then produces a timing signal. A second counter is set up to create an actual count indicative of the number of output signals occurring during a predetermined number of periods of an AC signal generator connected to the microprocessor. A predetermined desired count is then subtracted from the actual count to produce a difference count. The difference count is then added to the old correction count to create a new correction count. By iterating this process until the difference count is equal to zero, the timing signal is modified until it is equal to the desired time base.

REFERENCES:
patent: 3364439 (1968-01-01), Cohen et al.
patent: 3555446 (1971-01-01), Braymer
patent: 3568083 (1971-03-01), Harzer
patent: 3689849 (1972-09-01), Swanson et al.
patent: 3883863 (1975-05-01), Willard
patent: 3936739 (1976-02-01), Hogg
patent: 4044314 (1977-08-01), Sosin
patent: 4470025 (1984-09-01), Baker

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