Portable communication device

Details Portable communication device Portable communication device

1996-02-20

1999-03-16

Pham, Chi H.

Telecommunications

Receiver or analog modulated signal frequency converter

Cabinet, housing, or chassis structure

455552, 455575, H04B 138

Patent

active

058841563

ABSTRACT:
A portable communication device capable of operating in a telephony mode and in a dispatch mode is disclosed. The device includes a proximity sensor and a first speaker mounted on a front panel and a second speaker mounted on a rear panel. The operation of the speakers is controlled in accordance with the operational state of the device as well as the output of the proximity sensor.

REFERENCES:
patent: 3659050 (1972-04-01), Carlsson et al.
patent: 5175872 (1992-12-01), Borras
patent: 5179721 (1993-01-01), Comroe et al.
patent: 5212722 (1993-05-01), Murata
patent: 5224151 (1993-06-01), Bowen et al.
patent: 5337353 (1994-08-01), Boie et al.
patent: 5448620 (1995-09-01), Gershkovich
patent: 5450618 (1995-09-01), Naddell et al.

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