Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1953-10-07
1981-12-08
Birmiel, Howard A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
179 81E, 340538, H04K 100
Patent
active
043049630
ABSTRACT:
1. In a communication system for the transmission of electrical signals from a plurality of stations having a common power line located therein, the combination comprising a plurality of band-pass filters each having a different supersonic frequency band-pass range, a plurality of microphones each individually positioned within a different one of said stations and connected across the power line located therein through a different one of said filters, an alternating current generator for selectively generating supersonic frequencies corresponding to the band-pass frequencies for said filters connected across said power line said generator presenting to the line the conjugate of the impedance presented to the generator with the microphone loads connected across the line, two inductors having a relatively high impedance to the supersonic frequency of said generator each individually connected in series with a different conductor for said power line and positioned in the line between the power source for said line and the connection points of said generator to said line, an impedance bridge connected across said power line at a point more remote from the power source than said two inductors, said bridge having a relatively high impedance at said supersonic generator frequency and a detector connected to said impedance bridge for demodulating the modulation components superimposed upon said supersonic currents and generated by said microphone in response to sound energy impinging thereupon.
REFERENCES:
patent: 1539902 (1925-06-01), Honaman
patent: 2612558 (1952-09-01), Klipsch
Birmiel Howard A.
United States of America
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