Optical transmission of signals

Details Optical transmission of signals Optical transmission of signals

1996-12-13

1999-03-02

Harvey, David E.

Television

Television transmitter circuitry

348724, H04N 7220

Patent

active

058778209

ABSTRACT:
In optically transmitting a video signal comprised of luminance and chrominance signals which are frequency modulated to provide an FM luminance signal and an FM chrominance signal in respective adjacent frequency bands, such as, 6 to 20 MHz and 20 to 30 MHz, respectively, whereupon, infrared signals corresponding to the FM luminance and chrominance signals are output by respective emitting diodes, a carrier frequency for the FM chrominance signal is set, for example, between 25.93 and 26.08 MHz, so that the lower sideband wave of the FM chrominance signal is spaced by a substantial frequency from a frequency band in which a secondary distortion of the FM luminance signal is substantially generated. Further, the upper sideband wave of the FM chrominance signal is removed, as in a trap circuit, for ensuring that the transmitted FM chrominance signal will be accommodated in the respective frequency band therefor when its carrier frequency is set, as above. When the infrared signals corresponding to the FM luminance and chrominance signals are received by a photodiode and thereby transduced to respective FM modulated components output by the photodiode and then preamplified in common prior to separation, the component corresponding to the FM chrominance signal has the removed upper sideband wave restored by amplitude limiting thereof.

REFERENCES:
Patent Abstracts of Japan, vol. 011, No. 240 (E-529), Aug. 6, 1987 of JP 62 051885 Mar. 6, 1987.
Patent Abstracts of Japan, vol. 018, No. 069 (E-1502), Feb. 4, 1994 of JP 05 284144 Oct. 29, 1993.
Patent Abstracts of Japan, vol. 014, No. 022 (E-874), Jan. 17, 1990 of JP 01 264086 Oct. 20, 1989.
Patent Abstracts of Japan, vol. 009, No. 240 (E-345), Sep. 26, 1985 of JP 60 090483 May 21, 1985.

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