Radio telephone having analog key signal output for power conser

Details Radio telephone having analog key signal output for power conser Radio telephone having analog key signal output for power conser

1995-07-21

1999-11-09

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455574, 341 26, 379368, H04B 138, H03K 1794, H04M 100

Patent

active

059831162

ABSTRACT:
A radio telephone has an array of manually operable switches mounted on a respective support. A processing circuit processes signals received via said switches and said support supplies signals to said processing device over a single transmission line. The processing device is arranged to determine an analogue characteristic of a signal received from the support via said transmission line in order to determine which of said manually operable keys has been manually operated. An analogue-to-digital converter can be used to measure voltage values identifying key selection or a timer can be used to measure capacitor charging or discharging.

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patent: 5235636 (1993-08-01), Takagi et al.
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patent: 5534860 (1996-07-01), Phillips et al.
patent: 5619196 (1997-04-01), Escobosa
patent: 5621402 (1997-04-01), Spak et al.
patent: 5719597 (1998-02-01), Fong

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