Speakerphone with wireless infrared microphone

Details Speakerphone with wireless infrared microphone Speakerphone with wireless infrared microphone

1982-07-13

1985-09-24

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

179 2EA, 455603, 455613, 455618, 455619, H04B 900

Patent

active

045436657

ABSTRACT:
A speakerphone instrument is disclosed having a remote microphone unit providing infrared radiation carrier transmission of voice to a base station coupled to a telephone line. Voice controlled switching of the infrared carrier may be utilized to reduce power consumption. A local microphone in the base station is operable during periods when the remote microphone unit is not transmitting or if the signal-to-noise ratio of the infrared carrier becomes unsatisfactory for voice communication, to pick-up ambient sound and make available a microphone signal for transmission over the telephone line.

REFERENCES:
patent: 4221932 (1980-09-01), Anglikowski et al.
patent: 4224482 (1980-09-01), Lese et al.
patent: 4241236 (1980-12-01), Nash
patent: 4400584 (1983-08-01), Vilmur
"Litephone", offered by Controlonics Corporation, sales brochure.

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