Device for detecting metallic ticking sounds

Details Device for detecting metallic ticking sounds Device for detecting metallic ticking sounds

1985-12-02

1987-05-19

Tokar, Michael J.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G04B 1700

Patent

active

046657355

ABSTRACT:
An improved device for detecting ticking sounds produced from inside some mechanism, is described. The purpose of the device is to sense the ticks and produce a well defined electrical pulse for each tick while rejecting other noises and electrical interference. Previous devices for this purpose have typically employ-commercially available microphones as the sensor. The invention employs a combination of sensor and circuitry which gives improved rejection of noise, and a signal to noise ratio in excess of 10:1 under most conditions.

REFERENCES:
patent: 2544482 (1951-03-01), Barnes
patent: 2561084 (1951-07-01), Wickham et al.
patent: 3287506 (1966-11-01), Hahnlein
patent: 3690144 (1972-09-01), Bonny
patent: 3811315 (1974-05-01), Kunitomi
patent: 4112317 (1978-09-01), Everswick
patent: 4188549 (1980-02-01), Dorais
patent: 4417476 (1983-11-01), Knowlton
Berlin, The Design of Operational Amplifier Circuits, with Experiments, Oct. 1977, E & L Instruments, Inc., Derby, CT., pp. 9-8 to 9-9.

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