Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1990-01-31
1994-05-17
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
4552001, 4552481, 455355, H04B 116
Patent
active
053136616
ABSTRACT:
Method and circuit arrangement for adjusting the volume in a mobile telephone. The telephone comprises a transceiver unit and on the other hand a physically separate operating device. A dc voltage level (DC) corresponding to the desired volume is adjusted with a potentiometer (1) in the operating device and the level is converted with an A/D-converter (2) into a corresponding digital control signal. The control signal is read with a microprocessor (3) in the transceiver unit, which further through the hold circuit (4) controls the gain of the audio amplifier (7). A multiplexer (5) may be provided for controlling and selecting a suitable feedback resistor (6) for the amplifier. The A/D-converter can be located in the operating device or in the transceiver unit. When it is located in the transceiver unit the dc voltage level (DC) is transmitted to the transceiver unit, preferably superimposed on the AC-signal received from the microphone, which then is filtered off before the A/D-converter. The connection between the operating device and the transceiver unit may be realized with a cable or a wireless infrared or radio connection.
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Lajunen Ari-Pekka
Malmi Kalevi
Charouel Lisa
Eisenzopf Reinhard J.
Nokia Mobile Phones Ltd.
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