Audible speed indicator

Details Audible speed indicator Audible speed indicator

1977-07-26

1979-03-06

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

340 62, 340670, 180106, B60Q 154

Patent

active

041433521

ABSTRACT:
An audio vehicle speedometer in which two pulse trains, one having a frequency which varies as a function of vehicle speed and the other having a frequency which varies as a function of desired vehicle speed indicated by the manually set portion of a potentiometer, are produced and compared to produce a further pulse train having a frequency which varies as a function of the difference frequency between the first two trains. The further train is applied to a speaker to produce an audio pulse train whenever the vehicle speed exceeds the desired manually set speed.

REFERENCES:
patent: 3859629 (1975-01-01), Komiyama et al.
patent: 3900796 (1975-08-01), Rose

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