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
Method and apparatus for detecting a table of contents and reference determination
Apparatus and method for resolving an ambiguity from a direction of arrival estimate
Imaging device and focusing control method
Maize hybrid X00C165
Device for displaying the energy variation of an aircraft, corresponding method and system for displaying the energy variation
Tiki torch holder
Two-to-three channel upmix for center channel derivation
  Randomly Featured Patents
Globoid worm gear generating method
Biogas, fertilizer and recyclable water producing system
Quantitative aerosol dilution system
Method for increasing the protein contents of milk in ruminants
Open and close apparatus for a shelter of a boarding bridge
Compartment for maintaining a clean production environment
Telepresence communication system
Thermoplastic polymer for electrically conductive thermoforming applications
Integrated circuit chip support substrate for placing in a mold, and associated method