Intercom embodying tap transducers

Details Intercom embodying tap transducers Intercom embodying tap transducers

1976-01-12

1977-11-08

Stellar, George G.

179 1R, 179 81R, 179 84T, 179158R, H04M 902

Patent

active

040576884

ABSTRACT:
An intercom system having a pair of interconnected devices, each of which has a speaker, a tap transducer, a power source and switch means, so that when they are connected together electrically, each device may be used as a transmitter or as a received, with the tap transducer in each case forming part of an electrical circuit serving both to receive and transmit signalling and sound signals, such as voice or other speech sounds. A detection device is provided for insuring that the intercom operates in that orientation thereof which provides optimum operating characteristics.

REFERENCES:
patent: 291312 (1884-01-01), Drawbaugh
patent: 452636 (1891-05-01), Fitzsimmons
patent: 452758 (1891-05-01), Muller
patent: 978695 (1910-12-01), Caughrean
patent: 995849 (1911-06-01), Dunton

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