Digital speedometer with index control of display

Details Digital speedometer with index control of display Digital speedometer with index control of display

G - Physics

01

P

73/62, 340/148.7

G01P 3/48 (2006.01) G01P 3/489 (2006.01) G01P 3/54 (2006.01)

Patent

CA 1099949

DIGITAL SPEEDOMETER WITH INDEX COUNTER CONTROL OF DISPLAY 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 counter 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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