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1. (WO1999009665) HANDSET FOR HALF-DUPLEX COMMUNICATIONS THROUGH A CELLULAR TERMINAL

Pub. No.:    WO/1999/009665    International Application No.:    PCT/US1998/016838
Publication Date: Fri Feb 26 00:59:59 CET 1999 International Filing Date: Thu Aug 13 01:59:59 CEST 1998
IPC: H04B 1/38
H04W 4/10
H04W 84/08
Applicants: ERICSSON INC.
Inventors: PRZELOMIEC, Thomas, Anthony
BLASER, Robert, J.
TABAIAN, Seyed
Title: HANDSET FOR HALF-DUPLEX COMMUNICATIONS THROUGH A CELLULAR TERMINAL
Abstract:
An accessory apparatus and an associated method are disclosed for providing half-duplex communications through a full-duplex cellular terminal. The cellular terminal outputs a speaker signal and receives a microphone input signal. The accessory apparatus includes a speaker, a microphone, and a switch. The speaker broadcasts the speaker signal from the cellular terminal to a user. The microphone generates the microphone input signal which is provided to the cellular terminal. The switch has a first operation state and a different second operation state. In the first operation state, the switch electrically connects the speaker signal from the cellular terminal to the speaker while substantially electrically isolating the microphone input signal output, which is output by the microphone, from the cellular terminal. In the second operation state, the switch electrically connects the microphone input signal from the microphone to the cellular terminal while substantially electrically isolating the speaker from the speaker signal which is output by the cellular terminal. The switch transitions between the first state and the second state in response to a user's input to provide half-duplex communications through the full-duplex cellular terminal.