Portable telephone communications system

Details Portable telephone communications system Portable telephone communications system

1999-04-20

2000-11-28

To, Doris H.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455575, 455574, 455212, 455222, 379420, 379421, 379431, 381110, H04B 138

Patent

active

061546631

ABSTRACT:
A portable telephone communications system has a portable telephone terminal (300) and a repeater unit (100), and a remote receiver unit (200), wherein the repeater unit (100) includes a main power supply control device which includes detection means triggered by a signal from the telephone terminal arising on receipt of an incoming call, and including infra-red transmission means for transmitting the signal as a frequency-modulated signal to the remote receiver unit; the remote receiver unit (200) includes an infra-red receptor, demodulation means (205) and means for outputting the demodulated signals as audible voice signals, and further comprises a noise level comparator (209d) which compares the voltage of noise generated when no infra-red signals are received with a predetermined level and delivers an output signal when said voltage exceeds the predetermined level, and a time counter (210) which outputs a reset signal when the output from the noise comparator has been generated for a predetermined time interval, and a second power supply control device (212) which controls the power supply to the remote receiver unit.

REFERENCES:
patent: 4905270 (1990-02-01), Ono
patent: 4975964 (1990-12-01), Hochstein
patent: 5832390 (1998-11-01), Irvin

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