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

• Current Assignee: Luma Telecom, Inc. (Mitsubishi Electric Corporation), Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Luma Telecom, Inc. (Mitsubishi Electric Corporation), Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Ohtsuka, Hiroshi, Mackley, James S., Ueno, Yutaka, Emmons, Lawrence D.
• Primary Examiner(s): George, Keith E.
• Application Number:
  US07/263,892
• Time in Patent Office: 634 Days
• Field of Search: 379/53, 379/54, 379/96, 379/100, 358/85, 358/134, 358/257, 358/435, 358/436, 358/438
• US Class Current: 348/14.12
• CPC Class Codes: H04N 1/32702 using digital control signals H04N1/32704, H04N1/32614, H04N1/32771 take precedence
• CPC Class Codes: H04N 1/32791 Arrangements for reducing the handshaking procedure or protocol time
• CPC Class Codes: H04N 7/147 Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals selecting H04Q

Abstract

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 the picturephone set is transmitted and received, and a decision is made as to whether the still picture is being transmitted or not. A designation code of a desired response waiting time within an identification code data used at the time of handshaking is formed, and the response is delayed by a period of time corresponding to the response waiting time. A still picture data is directly transmitted and received without handshaking. In addition character data including character information and the like can be transmitted and received, and by manipulating the picturephone set of one party the picturephone set of the other party can be made to transmit picture data therefrom. Furthermore, the picture sent from the called party can be transferred to a third party.

Claims

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, comprising

forming desired response waiting time data within said identification code data;

and

in 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.

2. A still picture picturephone and data communication system wherein during a call, picture data obtained by a TV camera is modulated to a picture data signal to transmit the picture data signal to the other party through a telephone circuit, and a picture data signal transmitted from the other party through the telephone circuit is received to demodulate it to picture data and the picture data is displayed on a monitor TV, said system comprising:

means for inputting bit data which is in the form of digital binary data;

means for modulating the inputted bit data to a bit signal by establishing and utilizing an identity between each of the logical binary digits "1" and "0" of said bit data and one or more signals selected from said picture data signal; and

means for transmitting the modulated bit signal to the other party through the telephone circuit.

3. A system according to claim 2, wherein said picture data signal and said bit data signal each include both a modulated component of an amplitude and a modulated component of a phase of a single carrier frequency.

4. A system according to claim 3, wherein said bit signals each respectively corresponds to a different one of two signals of maximum amplitude which are out of phase with each other.

5. A system according to claim 3 or 4, wherein said bit signals each respectively corresponds to a different one of two sets of plurality of successive signals of one type of said picture signal.

6. A still picture picturephone communication system for transmitting and receiving still pictures comprising:

a first image memory for storing picture data of a picture of one party obtained by a TV camera;

a second image memory for storing picture data of a picture received from a second party upon being sent therefrom and received by said system;

a display for displaying the picture of the one party in a mirrored condition reversed with respect to right and left of the picture from the picture data stored in said first image memory, and for displaying the picture of the second party as it is in a non-mirrored condition from the picture data stored in said second image memory;

a selection button for selecting the picture to be transmitted from either of said first or second image memories; and

a CPU for reading out the picture data of the picture selected by said selection button from either of said first or second image memories, and for controlling transmission of the selected picture so that the selected picture is transmitted to the second party in the non-mirrored condition independent of whether the selected picture is the picture of the one party or of the second party.

7. A system according to claim 6, wherein said first image memory stores the picture data in a reversed condition with respect to right and left of the picture, and said CPU reads out the stored picture data from said first image memory in the order in which stored when the picture of the one party is to be displayed, and reads out the stored picture data from said first image memory in the reverse order from that in which stored when the picture of the one party is to be transmitted to the second party.

8. A system according to claim 6 or 7, wherein when the picture data of the second party stored in said second image memory is to be transmitted, an indication indicating that the picture is a transferred picture is inserted in the picture.