Multiplexed audio-video signal transmission system through pair-wire
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United States of America Patent
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Jul 7, 1998
Grant Date -
N/A
app pub date -
Apr 14, 1994
filing date -
Apr 16, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multiplexed audio-video signal transmission system has a camera-equipped intercom which produces a balanced audio-video signal. A twisted pair-wire connected to the intercom transmits a multiplexed signal of audio signal, video signal modulated to a frequency band not overlapping the audio signal frequency, and DC power. The audio signal and video signal are carried in the pair-wire in opposite phase in a balanced condition, and the DC power is carried between the pair-wire. A relay device is inserted in the pair-wire to refine the video signal. Main line branching device and door branching device are provided to branch out the multiplexed signal to a television equipped control unit 17.
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