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Still picture transmission apparatus

  • US 4,757,371 A
  • Filed: 02/19/1986
  • Issued: 07/12/1988
  • Est. Priority Date: 02/22/1985
  • Status: Expired due to Term
First Claim
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1. A system for transmitting picture data in packet form, each packet containing a data section including said picture data and a head section including channel address data, comprising:

  • a central terminal for transmitting said picture data and for transmitting commands in packet form over a transmission line;

    a plurality of local terminals connected to said transmission line and receiving preselected transmitted picture data and commands, each of said plurality of local terminals having a specific address; and

    a plurality of logic channels, each identified by a channel address through which said picture data and commands are transmitted from said central terminal to said local terminals over said transmission line, each logic channel formed by packets each of which includes the channel address for that logic channel in the head section channel address data,all of said plurality of local terminals being receptive to a common channel;

    said central terminal including transmitter means for transmitting commands through said common channel enabling predetermined ones of said local terminals to be additionally receptive to another channel,such that predetermined groups of said plurality of local terminals are dynamically selected to receive particular picture data and commands through said logic channels.

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