Time measurement system

Details Time measurement system Time measurement system

1993-09-02

1995-05-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Frequency or repetition rate conversion or control

327 40, 327 45, 327151, 379 58, 324601, H03D 1300, H04Q 704

Patent

active

054164354

ABSTRACT:
A time measurement system for measuring time accurately with an inaccurate clock, in which two clock oscillators are compared and the momentary error of the slower clock oscillator is measured. When the error change rate of the slower clock oscillator is slow enough the fast clock oscillator can be switched off for longer time intervals. With the help of this apparatus and method of operation power can be saved in portable equipment which requires accurate time measurement.

REFERENCES:
patent: 3870900 (1975-03-01), Malaviya
patent: 4332981 (1982-06-01), Palombi et al.
patent: 4955075 (1990-09-01), Anderson
patent: 5008629 (1991-04-01), Ohba et al.
patent: 5073973 (1991-12-01), Ylivakeri
patent: 5097490 (1992-03-01), Hulsing, II et al.
patent: 5142699 (1992-08-01), Sato et al.
patent: 5187471 (1993-02-01), Wagai et al.

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