CA2073893A1 - Multipoint teleconference system employing communication channels set in ring configuration - Google Patents

Multipoint teleconference system employing communication channels set in ring configuration

Info

Publication number
CA2073893A1
CA2073893A1 CA2073893A CA2073893A CA2073893A1 CA 2073893 A1 CA2073893 A1 CA 2073893A1 CA 2073893 A CA2073893 A CA 2073893A CA 2073893 A CA2073893 A CA 2073893A CA 2073893 A1 CA2073893 A1 CA 2073893A1
Authority
CA
Canada
Prior art keywords
teleconference system
terminal
communication channels
system employing
ring configuration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2073893A
Other languages
French (fr)
Other versions
CA2073893C (en
Inventor
Yoji Shibata
Masaaki Takizawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2073893A1 publication Critical patent/CA2073893A1/en
Application granted granted Critical
Publication of CA2073893C publication Critical patent/CA2073893C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B5/00—Electrically-operated educational appliances
    • G09B5/08—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations
    • G09B5/14—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations with provision for individual teacher-student communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H04M3/567—Multimedia conference systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/15—Conference systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13337—Picturephone, videotelephony

Abstract

A multipoint teleconference system dispensing with an MCU, in which terminals are connected into a loop configuration through an ISDN in such a way that each terminal is coupled with each of the adjacent terminals by a single B channel. Thus, a communication frame is revolved through a looped communication channel. Each terminal renews video data which is contained in an allotted area within the received communication frame and which was transmitted by the terminal itself, and it relays the resulting communication frame to the next terminal.
CA002073893A 1991-07-15 1992-07-15 Multipoint teleconference system employing communication channels set in ring configuration Expired - Fee Related CA2073893C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP17402591A JP3308562B2 (en) 1991-07-15 1991-07-15 Video conference terminal
JP3-174025 1991-07-15

Publications (2)

Publication Number Publication Date
CA2073893A1 true CA2073893A1 (en) 1993-01-16
CA2073893C CA2073893C (en) 1996-10-08

Family

ID=15971322

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002073893A Expired - Fee Related CA2073893C (en) 1991-07-15 1992-07-15 Multipoint teleconference system employing communication channels set in ring configuration

Country Status (6)

Country Link
US (1) US5365265A (en)
EP (1) EP0523626B1 (en)
JP (1) JP3308562B2 (en)
AU (1) AU645210B2 (en)
CA (1) CA2073893C (en)
DE (1) DE69214217T2 (en)

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Also Published As

Publication number Publication date
DE69214217T2 (en) 1997-05-15
JPH0522321A (en) 1993-01-29
DE69214217D1 (en) 1996-11-07
EP0523626B1 (en) 1996-10-02
CA2073893C (en) 1996-10-08
EP0523626A1 (en) 1993-01-20
JP3308562B2 (en) 2002-07-29
US5365265A (en) 1994-11-15
AU645210B2 (en) 1994-01-06
AU1964192A (en) 1993-01-21

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20090715