Wireless intercom having a transceiver in which a bias current for the condenser microphone and the driving current for the speaker are used to charge a battery during transmission and reception, respectively
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United States of America Patent
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-
Aug 24, 1993
Grant Date -
N/A
app pub date -
May 6, 1991
filing date -
May 6, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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