Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Wireless subscriber managing storage of HARQ packets
Signal processor and signal processing method
Packaging sleeve
Systems and methods for providing a collaboration place interface including data that is persistent after a client is longer in the collaboration place among a plurality of clients
Method and system for quantifying viewer awareness of advertising images in a video source
Photoelectric conversion device
Keypad assembly for electronic devices
  Randomly Featured Patents
Ceiling fan
Evaluation of heart mechanical performance
Film image reproduction apparatus utilizing apparatus illumination characteristics for film image reproduction
Inspection of an electrically conductive object using eddy currents
Spot-implant method for MOS transistor applications
Passenger screening system and method
Electric multi-point positioner
Optical device with optical modulator fixation-enhancing structure and projector
Articulating pilots on model trains
Apparatus for slitting casing surfaces and peeling the casings from a chain of sausages and the like