Wireless intercom having a transceiver in which a bias current f

Details Wireless intercom having a transceiver in which a bias current f Wireless intercom having a transceiver in which a bias current f

1991-05-06

1993-08-24

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455343, 455127, 320 2, H04B 146

Patent

active

052396878

ABSTRACT:
In a voice-controllable transceiver of a wireless intercom, the bias voltage for the condenser microphone is divided during transmission to give a current of 0.6 mA to 1mA. During reception, the driving voltage for the speaker is multiplied and rectified to a current of 1mA to 30mA. Both currents are used to charge a battery, resulting in a voice-controllable circuit having low power consumption circuit. The voice-controllable transceiver therefore does not require an external power source or frequent battery replacement.

REFERENCES:
patent: 3980996 (1976-09-01), Greenspan
patent: 4426733 (1984-01-01), Brenig
patent: 4673861 (1987-06-01), Dubovsky et al.
patent: 4684870 (1987-08-01), George et al.
L. R. Grump; Powering Transistorized Electronic Devices with Radiated Energy; Dec. 1957; pp. 1-17; Office of Technical Services, DOC.

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