Registers – Platform operated – Platform actuated traffic counters
Patent
1974-09-30
1976-08-31
Boudreau, Leo H.
Registers
Platform operated
Platform actuated traffic counters
58 50R, 73 6, 235 92FQ, 250578, 315241S, 324 78D, 324181, G04C 1902, G01R 2306, G06F 756
Patent
active
039783227
ABSTRACT:
A system for measuring the accuracy of an internal timing source of a device having a light emitting display which is energized at a rate derived from the timing cycle of that timing source includes an optical pickup disposed for receiving light emission from one element of the display and generating a signal having the same frequency as the frequency of such light emission. In one embodiment, the pulses of that signal which occur within a given time period are counted and the number of such counted pulses is supplied to a display for human recognition. In a second embodiment, the time elapsed during one or more complete light emitting cycles is measured and displayed for human recognition. The pulses of a timing signal having a period of one microsecond which occur during one or more complete light emitting cycles are counted and the resultant count is displayed. A method includes the steps of comparing a time reference signal with a signal corresponding to the light emitting cycle of the light emitting display, determining the ratio of one parameter of the time reference signal to one parameter of the light emitting cycle, and displaying the value of either the ratio, a multiple of that ratio, or a submultiple of that ratio.
REFERENCES:
patent: 3144802 (1964-08-01), Faber, Jr. et al.
patent: 3289039 (1966-11-01), Stamm et al.
patent: 3393321 (1968-07-01), Frungel
patent: 3553728 (1971-01-01), Frank et al.
patent: 3747323 (1973-07-01), Eckenrode
patent: 3811314 (1974-05-01), Anouchi
patent: 3846972 (1974-11-01), Doss
Boudreau Leo H.
National Semiconductor Corporation
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