Security apparatus with audible alarm of enhanced urgency

Details Security apparatus with audible alarm of enhanced urgency Security apparatus with audible alarm of enhanced urgency

1981-06-04

1983-05-31

Swann, III, Glen A.

Communications: electrical

Audible indication

Ultrasonic pest control

340692, 367139, G08B 300

Patent

active

043863418

ABSTRACT:
A security device incorporates apparatus for producing a special alarm sound in response to a change in acceleration sensed with a special omnidirectional sensor and under the control of special SCR circuitry. The circuitry and sensor are especially adapted for the security application but have independent utility. The alarm generates two tones in the middle audio range, separated by 50 to 200 Hz. One of those tones is interrupted at a sub-audible rate of 3 to 8 Hz. The resulting alarm, at high volume levels, is of enhanced urgency, compelling a hearer to escape, the compulsion being of a degree not easily overcome by reason.

REFERENCES:
patent: 3557899 (1971-01-01), Longinette et al.
patent: 3566347 (1971-02-01), Flanders
patent: 4075625 (1978-02-01), Cieslak et al.
patent: 4284845 (1981-08-01), Belcher

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