System for transmitting signals between a television camera and

Details System for transmitting signals between a television camera and System for transmitting signals between a television camera and

1979-12-12

1981-11-10

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

455603, H04N 524

Patent

active

043001661

ABSTRACT:
Signals to be transmitted through optical fibers either from a television camera to its control unit or vice versa are processed as follows. At first audio signal to be transmitted is amplitude modulated on a carrier. A second audio signal, which has a frequency range which does not include the frequency of the above-mentioned carried, and the amplitude modulated signal are frequency modulated onto a second carrier. The locally generated video signal, after passing through a digital data transmitter, as well as the frequency modulated signal are pulse modulated and the pulse modulated signal is used to modulate the light of a laser, the light in turn being transmitted by the optical fibers. At the receiving end a photo diode is provided to transduce the signal back into electrical signals and, after the demodulation in reverse order as the modulation, the desired signals are available at the receiving location.

REFERENCES:
patent: 3534160 (1970-10-01), Lowenstein
patent: 3827074 (1974-07-01), De Thieullay
patent: 4054794 (1977-10-01), Laughlin

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