Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-07-28
1983-05-31
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
250551, 340539, 34082572, 358198, 455231, 455352, 455602, H04N 544, H04N 560
Patent
active
043863710
ABSTRACT:
In a wired remote control for use with a television receiver, audio signals are coupled to a loudspeaker by a transformer providing electrical isolation. The remote control device comprises an oscillator applying a signal at a frequency above the audio range to the transformer and a rectifier at the transformer secondary converting the oscillator signal to a DC signal. That DC signal is selectively applied by a switch to an optocoupler which couples to a control device for controlling the audio source. A filter blocks the oscillator signal from the speaker. Additionally, the control device controls TV channel selection.
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Berard, Jr. C. A.
Rasmussen P. J.
RCA Corporation
Richardson Robert L.
Whitacre E. M.
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