Digital speedometer for indicating velocity in at least two...

Details Digital speedometer for indicating velocity in at least two... Digital speedometer for indicating velocity in at least two...

G - Physics

01

P

73/62, 340/148.7

G01P 3/54 (2006.01) G01P 3/489 (2006.01) G01R 23/10 (2006.01)

Patent

CA 1100330

DIGITAL SPEEDOMETER FOR INDICATING VELOCITY IN AT LEAST TWO SELECTABLE UNITS OF MEASUREMENT ABSTRACT OF THE DISCLOSURE A digital speedometer for indicating angular or linear velocity has an index counter to control update of the displayed velocity. The purpose of the index coun- ter is to prevent undesirable fluctuation of the displayed velocity where minor variations in velocity being measured have occurred. The digital speedometer uses a pulsating input signal having a frequency proportional to the velocity to be indicated. An oscillator circuit provides a clock frequency that is utilized in generating a counting period electrical signal. During the counting period, the input pulses proportional to velocity are gated into a counter. After each counting period, a comparison is made between the count currently being displayed and the count stored in the counter. If a difference occurs, the index counter is incremented. Only after the index counter has been incremented a plurality of consecutive times is the display permitted to be updated.

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