Data transmitter for selectively transmitting data to receivers via transmission lines switched on or over in synchronization with an external synchronizing signal

  • US 5,579,060 A
  • Filed: 03/15/1995
  • Issued: 11/26/1996
  • Est. Priority Date: 03/15/1995
  • Status: Expired due to Term
First Claim
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1. An apparatus for selecting information signals, comprising:

  • a plurality of transmitting means each adapted to process an electrical information signal;

    a plurality of receiving means for selectively receiving said information signal;

    a plurality of information transmission lines for connecting each receiving means to said plurality of transmitting means;

    an external synchronizing signal generating means for generating and feeding an external synchronizing signal to said plurality of transmitting means and said plurality of receiving means;

    wherein;

    each transmitting means includes a distribution circuit for feeding said information signal to said plurality of receiving means through said information transmission lines,each receiving means includes a selection circuit for selectively switching on one or more of said plurality of information transmission lines or switching over from one of said plurality of information transmission lines to another,the switching on or the switching over timing of said information transmission lines in said selection circuits of said plurality of receiving means is synchronized with said external synchronizing signal, andsaid information signal contains a video signal; and

    a plurality of video signal generating means for feeding said video signal to said transmitting means;

    each video signal generating means including an internal synchronizing signal generation circuit synchronized by said external synchronizing signal, and at least one receiving means further including a video signal processing means for reproducing and/or recording an image corresponding to the video signal contained in said information signal fed from said selection circuit, andwherein;

    said external synchronizing signal is a pulse signal having a voltage level higher than the maximum voltage level or lower than the minimum voltage level of said video signal,each transmitting means further includes a circuit for injecting said external synchronizing signal into a transmission line extended from said transmitting means to said video signal generating means, andeach video signal generating means further includes a level comparing circuit for extracting said external synchronizing signal by comparing the signal level of said pulse signal with a reference signal having a predetermined voltage level for applying said extracted external synchronizing signal to said internal synchronizing signal generation circuit.

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