Multi-location television conference system

• US 5,323,445 A
• Filed: 03/05/1992
• Issued: 06/21/1994
• Est. Priority Date: 03/07/1991
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Nakatsuka, Kunio
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): Woo, Stella L.
• Application Number:
  US07/846,146
• Time in Patent Office: 838 Days
• Field of Search: 379/53, 379/54, 379/96, 379/94, 379/202, 379/204, 379/205, 379/206, 358/85, 358/86, 370/62, 370/84, 370/110.1, 370/85.12, 370/85.15, 370/79
• US Class Current: 348/14.09
• CPC Class Codes: H04M 3/56 Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities video conference systems H04N7/15
• CPC Class Codes: H04N 7/15 Conference systems
• CPC Class Codes: H04N 7/152 Multipoint control units therefor
• CPC Class Codes: H04Q 11/04 for time-division multiplexing H04Q11/0001 takes precedence
• CPC Class Codes: H04Q 11/0428 Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13199 Modem, modulation
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/1324 Conference call
• CPC Class Codes: H04Q 2213/13337 Picturephone, videotelephony
• CPC Class Codes: H04Q 2213/13349 Network management

Abstract

A multi-location conference system has conference terminals connected to a conference device, which stores information for the conferences. A reservation center registers and deletes conference information in and from the conference device at times designated in accordance with reserved conference information collected in advance for the respective conferences, thereby controlling automatically the starting and ending of each of the conferences. Where there are first conference terminals that can be connected with a selected one of line speeds, and second television terminals that can be connected with a fixed one of the line speeds, and a plurality of conference devices each capable of simultaneously holding multi-location conferences at a selected one of said plurality of line speeds are provided, an operational management device is provided to assign, at the time of convening or reserving a conference, the conference device by a sequential search in an order different dependent on the selected line speed.

Claims

1. A multi-location conference system comprising:

a plurality of conference terminals performing input and output of conference data consisting of video and audio signals;

a conference device which is connected to said plurality of conference terminals and which includes means for holding conferences between said plurality of conference terminals by processing conference data sent to said conference device from said plurality of conference terminals to produce synthetic conference data and sending said synthetic conference data to said plurality of conference terminals, wherein said conference device is further provided with a conference table storing conference information for the conference terminals participating in conferences being held; and

a reservation center operably connected to said conference device for registering conference terminal information in said conference table and deleting conference terminal information from said conference table at times designated in accordance with reserved conference information collected in advance for the respective conferences, thereby controlling automatically starting and ending of each of the conferences.

2. The system of claim 1, wherein said conference device is capable of holding a plurality of conferences simultaneously.

3. The system of claim 1, further comprising a reservation terminal connected with said reservation center via a communication line;

wherein

said reserved conference information comprises a reservation decision information requisite for making the decision as to whether to accept or reject the reservation, and reservation detail information required for control over performing the conference;

said reservation terminal sends the reservation decision information via a communication line to said reservation center;

said reservation center makes, responsive to the reservation decision information, a decision as to whether to accept or reject the reservation at said reservation center, and sends the result of decision from said reservation center to said reservation terminal; and

said reservation terminal sends, if the result of the decision is to accept the reservation, the reservation detail information to said reservation center, thereby to achieve the registration of said reserved conference information to the reservation center.

4. A multi-location television conference system comprising:

a plurality of first television conference terminals that can be connected to a communication network at a first line speed;

a plurality of second television conference terminals that can be connected to said communication network at a second line speed;

a plurality of conference devices which are connected by a plurality of lines to said communication network, and which are capable of simultaneously holding multi-location conferences at a selected one of said first and second line speeds; and

an operational management device for controlling starting and ending of a multi-location conference, to which said conference devices are connected, which determines, at the time of convening said multi-location conference, the conference device which is to hold the conference by searching for the conference device which can hold the conference at the line speed with which the television conference terminals participating in the conference can be connected, and determines the line speed and the number of vacant lines of each of the conference devices in a different predetermined order depending on the specific line speed.

5. The system of claim 4, wherein the order predetermined for said first line speed is sequential in descending order and the order for said second line speed is sequential in ascending order.

6. The system of claim 4, wherein said first conference terminals can also be connected to a communication network with said second line speed.

7. A multi-location television conference system comprising:

a plurality of first television conference terminals that can be connected to a communication network at a first line speed;

a plurality of second television conference terminals that can be connected to said communication network at a second line speed;

a plurality of conference devices which are connected by a plurality of communication lines to said communication network, and which are capable of simultaneously holding multi-location conferences at a selected one of said first and second line speeds; and

an operational management device to which said conference devices are connected, including

a reservation file for storing reserved conference information including a starting time and an ending time of each multi-location conference,

a clock by which it is possible to indicate the current time, and

means for reserving a conference device for holding a multi-location conference, and which controls starting and ending of the conference;

wherein, at the time of reserving a multi-location conference, said operational management device determines, in accordance with the number of conference terminals which are to participate in the conference, the line speed at which the reservation has been made for each conference device, and the number of vacant lines of each conference device, the conference device which is to be reserved for the conference by searching for the conference device which can hold the conference with the line speed at which the television conference terminals which are to participate in the conference can be connected, wherein said search is made in a different predetermined order dependent on the specific line speed.

8. The system of claim 7, wherein the order predetermined for said first line speed is sequential in descending order and the order for said second line speed is sequential in ascending order.

9. The system of claim 7, wherein said first conference terminals can also be connected to a communication network with said second line speed.