Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1992-02-19
1994-05-17
Kuntz, Curtis
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379420, 379406, H04M 1100
Patent
active
053135148
ABSTRACT:
In a land mobile radio telephone apparatus, a microphone unit for inputting speeches to be transmitted in incorporated in a plug that can be connected to a cigar lighter socket provided near a driver's seat in a vehicle, and the plug with the microphone unit built therein is connected to a radio telephone apparatus body via cables for supplying power from a power source and a cable for inputting the speech voices. A speaker unit is built in the radio telephone apparatus body. An end portion of a casing of the plug is formed into a tubular shape, and the microphone having a directivity is incorporated in the tubular end portion in such a manner that it can be semi-fixed. Directivity of the microphone is thus directed toward the driver. The microphone unit has a directivity adjusting mechanism, and is supported by supporting member having a vibration-proof effect. Furthermore, a noise removing circuit is provided between the microphone unit and a circuit unit for suppressing sound coupling between the microphone unit and the speaker unit.
REFERENCES:
patent: 5031872 (1991-07-01), Vance et al.
patent: 5054115 (1991-10-01), Sawa et al.
Mitsubishi International Corporation Brochure, "Portable Cellular Telephone" (Model 3000), copyright 1991 (assumed Jan. 1. 1991).
Bost Dwayne D.
Kuntz Curtis
Matsushita Electric - Industrial Co., Ltd.
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