Radio telephone apparatus with microphone mounted in battery cas

Details Radio telephone apparatus with microphone mounted in battery cas Radio telephone apparatus with microphone mounted in battery cas

1991-03-07

1993-10-05

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 90, 455128, 455348, 455349, 379440, H04B 138

Patent

active

052513297

ABSTRACT:
A radio telephone apparatus for transmitting and receiving information signals as electrical waves includes a main body section towards one end of which a speaker unit is enclosed. A battery casing accommodating a battery which is adapted for supplying power to the main body section is detachably mounted on the other end of the main body section to reduce the size and the thickness of the apparatus. A ringer device is enclosed within the battery casing so that the acoustic sound emitted by the ringer is prevented from reaching the user's ear which is in the vicinity of the speaker unit. The microphone for the radiotelephone apparatus in also enclosed within the battery casing.

REFERENCES:
patent: 4578628 (1986-03-01), Siwiak
patent: 4641370 (1987-02-01), Oyamada
patent: 4845772 (1989-07-01), Metroka
patent: 5109539 (1992-04-01), Inubushi
Mitsubishi International Corporation brochure: "Model 3000 Portable Cellular Telephone" Jan. 1, 1991.

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