Siren detector

Details Siren detector Siren detector

1975-09-11

1976-11-16

Envall, Jr., R. N.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340 38S, G08G 104

Patent

active

039926567

ABSTRACT:
An audio range siren detector utilizes an audio pickup including an A.G.C. amplifier, a plurality of electronic active filters having closely spaced resonant frequencies such as 800, 825, 850 timing means responsive to an actuating signal from one of the filters for generating a time slot signal of short duration, gating means responsive to each of the filter means for producing an actuating signal, control logic responsive to the occurrence of all actuating signals within the time slot to produce output denoting a valid siren signal, and relay means for setting traffic lights to emergency condition.
The detector includes counters and additional timers to further restrict the conditions under which a valid siren signal will be responded to in order to better discriminate against extraneous ambient noises of all types.

REFERENCES:
patent: 2355607 (1944-08-01), Shepherd
patent: 3715579 (1973-02-01), Eblovi

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