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
Low temperature pressure chamber unit, magnetic resonance device with a low temperature pressure chamber unit, and an attachment method to attach at least one add-on unit to an external housin
Simulation tool for air traffic communications security
Instance management of code in a database
Solid-state image pickup element, method of manufacturing the same, and image pickup apparatus including the same
Virtual physician acute myocardial infarction detection system and method
Navigation device, navigation method, and navigation program
Power storage device and method for manufacturing the same
  Randomly Featured Patents
Location-based mobile gaming application and method for implementing the same using a scalable tiered geocast protocol
Floating devices connection and/or storage system and table
Storage system and data migration method
Combined container and closure
IC socket
Descenting systems and methods
Security devices
Low voltage door switch
Multi-level cell access buffer with dual function
System for precisely controlling the operational characteristics of a relay