Laser signal mixer circuit
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United States of America Patent
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Sep 25, 1990
Grant Date -
N/A
app pub date -
Mar 30, 1989
filing date -
Mar 30, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit for mixing audio, video and data signals for transmission by laser link. The data signal is first modulated by frequency shift keying and then, after passing through a bandpass filter, is mixed with the audio signal and then frequency modulated at about 12 MHz. The combined signal is then mixed with the 70 MHz frequency modulated video signal, but each signal is isolated from the mixed signal by an appropriate filter so that each signal is not fed to the other source.
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