System for selectively operable dual simultaneous siren broadcas

Details System for selectively operable dual simultaneous siren broadcas System for selectively operable dual simultaneous siren broadcas

1977-02-25

1978-05-09

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 300

Patent

active

040889955

ABSTRACT:
A system for broadcasting two siren sounds simultaneously over a single speaker. This function is performed by adding or subtracting the signals.

REFERENCES:
patent: 3378624 (1968-04-01), Markowitz
patent: 3493966 (1970-02-01), Human
patent: 3774148 (1973-11-01), McIntosh
patent: 3893107 (1975-07-01), Schedler

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