Optical transmitting and receiving apparatus

Details Optical transmitting and receiving apparatus Optical transmitting and receiving apparatus

1983-01-31

1984-11-06

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

375 17, 455606, H04B 900

Patent

active

044816774

ABSTRACT:
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.

REFERENCES:
patent: 3899429 (1975-08-01), Ueno et al.
patent: 3927316 (1975-12-01), Citta
patent: 4027152 (1977-05-01), Brown et al.
patent: 4151407 (1979-04-01), McBride et al.
patent: 4306449 (1981-12-01), Hoffman
patent: 4399564 (1983-08-01), Cowen

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