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Video transmission and control system utilizing internal telephone lines

  • US 5,949,473 A
  • Filed: 03/17/1997
  • Issued: 09/07/1999
  • Est. Priority Date: 07/14/1989
  • Status: Expired due to Fees
First Claim
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1. A system for communicating control and audio-video information over a two-conductor telephone network in a higher frequency band of frequencies above the highest frequency of a telephone voice band concurrently used to carry voice signals to and from at least one telephone station coupled to the telephone network, comprising:

  • a first transceiver coupled between a source of control signals containing control information and a first location on the telephone network, includingcircuitry for receiving control signals generated by the source of the control signals, and encoding the control signals in a first frequency range within the higher frequency band, andcircuitry for transmitting the encoded control signals over the telephone network;

    a second transceiver coupled between a second location on the telephone network and a source of audio-video information, includingcircuitry for receiving the encoded control signals from the telephone network,circuitry for reproducing the control information from the encoded control signals and transmitting the reproduced control information to the source of the audio-video information,circuitry for receiving audio-video information from the source of the audio-video information, andcircuitry for converting the audio-video information to audio-video signals in a second frequency range within the higher frequency band and separate from the first frequency range, and transmitting the audio-video signals over the telephone network; and

    circuitry for preventing transmission of signals in the higher frequency band to at least one telephone station;

    wherein the first transceiver is coupled to a destination of the audio-video information, and further includescircuitry for receiving the audio-video signals from the telephone network,circuitry for converting the received audio-video signals to a third frequency range so that the converted audio-video signals can be used by the destination of the audio-video information, andcircuitry for transmitting said converted audio-video signals to the destination of the audio-video information.

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