Still picture transmission apparatus
First Claim
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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Accused Products
Abstract
A still picture transmission apparatus in which still picture data is transmitted in packet form from a central terminal having a picture data bank selectively to a plurality of local terminals through a common transmission line at which a plurality of distinct logic channels are established, wherein a packet transmission is conducted in such a manner that a command designating a channel number is transmitted to a desired local terminal to which channel the local terminal is to be connected, and still picture data is transmitted with the use of the packet having said channel number.
21 Citations
2 Claims
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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:
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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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2. A method for transmitting picture data in packet from, each packet containing a data section including said picture data and a header section including channel address data, comprising the steps of:
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providing a plurality of logic channels each identified by a channel address through which picture data and commands are transmitted over a transmission line between a central terminal and a plurality of local terminals, each logic channel formed by data packets each of which includes the channel address for that logic channel in the header section channel address data; designating a common channel to which all local terminals are receptive; transmitting commands through said common channel enabling predetermined ones of said plurality of local terminals to be additionally receptive to another channel; transmitting picture data through said channels to predetermined groups of said plurality of local terminals selected by said commands; and transmitting commands through said channels to alter the constituency of said predetermined groups.
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Specification