Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2005-12-06
2005-12-06
Ferguson, Keith T. (Department: 2683)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S522000, C455S069000, C455S550100, C455S126000, C455S127100, C455S115200, C370S311000, C375S345000
Reexamination Certificate
active
06973334
ABSTRACT:
A cellular telephone includes a receiver connected to an antenna through a duplexer. The receiver converts a first communication signal into a voice signal code, and outputs a signal indicating an intensity of the first communication signal. The cellular telephone also includes a transmitter connected to an encoder/decoder apparatus and to the antenna through the duplexer. The receiver converts the input voice code signal from the encoder/decoder apparatus into a second communication signal. A controller controls the amplitude of the transmitter corresponding to the intensity of the first communication signal. The transmitter includes a variable amplitude amplifier and a power amplifier, and the controller includes a central processing unit and a memory. The controller controls a gain of the variable amplitude amplifier and a bias condition of the power amplifier according to a function stored in the memory.
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patent: 9-46152 (1997-02-01), None
Katagishi Makoto
Machida Shirou
Ferguson Keith T.
Hitachi , Ltd.
Mattingly, Stanger Malur & Brundidge PC
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