Electrically-operated backup alarm

Details Electrically-operated backup alarm Electrically-operated backup alarm

1982-11-08

1986-07-29

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340384E, 331108D, 331111, 381108, B60Q 126

Patent

active

046033173

ABSTRACT:
An improved electrically-operated backup alarm for use on mobile construction and industrial machinery, including selectable lower and higher loudness levels, automatically adjustable loudness level with respect to varying ambient noise level in which the alarm is operating, high and low frequency compensation to substantially eliminate high and low frequency signal components of the sensed ambient noise, and compensation for responding to transient signal components of the sensed ambient noise.

REFERENCES:
patent: 3173136 (1965-03-01), Atkinson
patent: 4061874 (1977-12-01), Fricke et al.
patent: 4247955 (1981-01-01), Weidemann
patent: 4254303 (1981-03-01), Takizawa

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