1980-01-31
1982-04-20
Wolff, John H.
H04M 160
Patent
active
043261060
ABSTRACT:
A microphone amplifier in a telephone station furnished with current from the telephone network. When a capacitive degenerative feedback is used in the amplifier a certain time has to pass after applying the supply voltage before the operating point of the amplifier is reached because of the charging time of the capacitor. The switching of the supply voltage occurs at the dialing operation at each digit of a dial number since during the transmission period of a digit the handset including the microphone is switched off the subscriber line which carries the current usd for supplying the amplifier with energy. By the use of a special circuit the charging time of the capacitor is shortened drastically.
REFERENCES:
patent: 3899742 (1975-08-01), Yum et al.
Minner Willy
Reitz Erhard
Rodenheber Rainer
Licentia Patent-Verwaltungs GmbH
Popek J. A.
Telefonbau und Normalzeit GmbH
Wolff John H.
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