Resources Contact Us Home
Multiplexed audio-video signal transmission system through pair-wire

Image Number 14 for United States Patent #5778303.

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.

  Recently Added Patents
Dimmable LED light fixture having adjustable color temperature
Delta-sigma AD converter circuit and battery pack
Control unit including a computing device and a peripheral module which are interconnected via a serial multiwire bus
Solar energy converter with improved photovoltaic efficiency, frequency conversion and thermal management permitting super highly concentrated collection
Bulk vending apparatus, system and method
Liquid crystal display and manufacturing method thereof
Containers having radio frequency identification tags and method of applying radio frequency identification tags to containers
  Randomly Featured Patents
Switched multi-channel network interfaces and real-time streaming backup
Dehumidifier for cryogenic refrigeration system
Scroll pump and method of assembling same
Touch switch with integral control circuit
Elevator control based on group size
Static var compensators
Ammonium nitrate granule and method for the preparation of the same
Method of directing water by electro-osmosis to an electrically conductive pile
Combined container and carrier wristband
Device for control of a robot manipulator for a metal sheet bending installation