Optical transmitting and receiving apparatus

Details Optical transmitting and receiving apparatus Optical transmitting and receiving apparatus

H - Electricity

04

N

325/1, 379/11

H04N 7/16 (2006.01) H04B 9/00 (1985.01)

Patent

CA 1194127

OPTICAL TRANSMITTING AND RECEIVING APPARATUS Abstract of the Disclosure Speech signals are optically coupled from a transmitter to a receiver using low duty-cycle infrared pulses. A conditioning circuit converts an a.c. input signal to be transmitted into a unipolar signal, whose magnitude controls the frequency of an oscillator which determines the frequency of the infrared pulses. In the receiver the detected pulses are low-pass filtered in a voice-band filter the output of which is coupled to a telephone line and/or a loudspeaker. A plurality of similar transmitters can be provided to enable signals from an arbitrary number of people to be coupled to a common receiver. - i -

420447

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