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Still picture picturephone communications system

  • US 4,943,994 A
  • Filed: 10/28/1988
  • Issued: 07/24/1990
  • Est. Priority Date: 10/30/1987
  • Status: Expired due to Fees
First Claim
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1. A method of operating a still picture picturephone communication system for transmitting and receiving a still picture over a telephone circuit including a handshaking process wherein prior to still picture transmission, identification code data indicating a function of picturephone sets and including a divided number of pixels per one frame of a still picture is sent and received, matching of the function of equipment of a calling party with the function of equipment of a called party is achieved, and decision is made as to whether the still picture is being transmitted or not, comprisingforming desired response waiting time data within said identification code data;

  • andin said handshaking process, sending out response data including identification code data or still picture data delayed by a period of time corresponding to said response waiting time data within the identification code data received from the called party.

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