Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1979-11-01
1981-03-17
Pitts, Harold I.
Communications: electrical
Audible indication
Ultrasonic pest control
340384R, 340 52F, G08B 300
Patent
active
042570352
ABSTRACT:
An alarm circuit for generating syllable-pause alarm code signals comprising an alarm. Controlling the operation of the alarm are first and second switching circuits. A primary code generator controls the operation of the first switching circuit for operating the alarm to produce a primary syllable-pause alarm code. The operation of the primary code generator is controlled by the application of a voltage resulting from an alarm condition. A secondary syllable circuit is also connected to the first switching circuit to control the operation thereof, which, in turn, controls the operation of the alarm to turn on the alarm for a short time duration during the pause portion of the syllable-pause alarm code. The operation of the secondary syllable circuit is controlled by the application of voltage resulting from an alarm condition. The second switching circuit is normally operated to render the alarm operative. The operation of a secondary pause circuit controls the operation of the second switching circuit to turn off the alarm for a short time duration during the syllable portion of the syllable-pause alarm code. The operation of the secondary pause circuit is controlled by the application of voltage resulting from an alarm condition. Different alarm conditions will result in a diode steering network applying the voltage resulting from an alarm condition to generate different discrete syllable-pause alarm codes.
REFERENCES:
patent: 4000489 (1976-12-01), Bench
patent: 4193060 (1980-03-01), Slavin
Pitts Harold I.
Wiseman Jack M.
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