Interval-expanding timer

Details Interval-expanding timer Interval-expanding timer

Filed on

1982-03-10

Date issued

1985-06-11

Examiner

Wise, Edward J.

Patent Class

Boots, shoes, and leggings

Other Related Categories

377 20, G04F 1004

Type

Patent

Status

active

Patent number

045232881

Description

ABSTRACT:
An interval-expanding timer compensated for drift and nonlinearity in which a time interval .DELTA.T+nT.sub.0 of the sum of a time interval .DELTA.T to be measured and a constant time interval nT.sub.0 and time intervals (n+1)T.sub.0 and nT.sub.0 are respectively measured after being expanded and the expression ##EQU1## is calculated based on the measured results, thereby to measure the time interval .DELTA.T. The expansion of the time intervals is carried out in the following manner: A fixed voltage is integrated by a first integrator for a given period of time, and the fixed voltage is integrated by a second integrator at an integration rate smaller than that of the first integrator. Coincidence is detected between the integrated outputs from the first and second integrators, and the time interval from the start of integration by the second integrator to the detection of coincidence is provided as the interval-expanded output. The time intervals .DELTA.T+nT.sub.0, (n+1)T.sub.0 and nT.sub.0 are each expanded by such a method.

REFERENCES:
patent: 3784919 (1974-01-01), Azegami
patent: 4267436 (1981-04-01), Hayashi

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