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
Combined high and low frequency stimulation therapy
Method for accessing wireless network
Process for producing a carbon-comprising support
Semiconductor light-receiving device
Optical navigation device with image sensor and inner housing
Dynamic data caches, decoders and decoding methods
Lead frame array package with flip chip die attach
  Randomly Featured Patents
Data line driver capable of generating fixed gradation voltage without switches
Polymer-modified resins
Wireless battery snap
Flexible laser safety curtain
Polishing head for a polishing machine
Data processing system having dual processors
Laser welded inkjet printhead assembly utilizing a combination laser and fiber optic push connect system
Semiconductor devices and manufacturing methods thereof
Method and apparatus for removing skin and fat from meat parts
Site-directed modification of FVIII