Cordfree communication instrument

Details Cordfree communication instrument Cordfree communication instrument

G - Physics

02

B

325/1, 379/11, 8

G02B 27/00 (2006.01) H04B 10/10 (2006.01) H04M 1/05 (2006.01) H04M 1/737 (2006.01)

Patent

CA 1200843

ABSTRACT A cordfree instrument for full-duplex voice and/or data communication via a diffuse infrared radiation communication link with a base station. Private multi- channel operation is afforded by diffuse infrared radi- ation carrier transmission in which a sub-carrier, fre- quency-modulated by voice or data signals, amplitude- modulates the intensity of infrared radiation from light- emitting diodes. The instrument may be a headset or hand-held voice communication instrument, and/or a port- able data terminal. When the instrument is functioning as a voice communication instrument, the infrared transmis- sion carrier may be voice actuated for reduced power consumption. the apparatus may be used as a telephone subscriber instrument, with the base station interface to a telephone line. When in use as a telephone subscriber instrument, the cordfree instrument and base station provide remote hookswitch control.

379737

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