Sound activated transmitter

Details Sound activated transmitter Sound activated transmitter

1995-05-10

1997-06-10

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

With particular coupling link

340328, 340330, 340331, 340500, 340531, G08B 108

Patent

active

056380470

ABSTRACT:
A remote annunciator system in which the emission of an acoustic signal by a first annunciator is detected by an acoustic signal detector which causes a radio frequency transmitter to transmit a radio frequency signal. A radio frequency receiver which receives the signal operates a second annunciator which is remote from the first annunciator, to cause the second annunciator to emit an audible or visual signal. Preferably, the radio frequency signal is encoded and is decoded at the receiver, and if the first annunciator can emit two different accoustic signals, the transmitted signal is encoded dependent upon which acoustic signal is emitted and the receiver decoder causes the second annunciator to emit an audible signal or a visual signal which depends on the transmitted signal encoding.

REFERENCES:
patent: 4025918 (1977-05-01), Beuchamp
patent: 4297677 (1981-10-01), Lewis
patent: 4305070 (1981-12-01), Samuel
patent: 4365238 (1982-12-01), Kollin
patent: 5365214 (1994-11-01), Angott
patent: 5400011 (1995-03-01), Sutton

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