CA2073925A1 - Multipoint teleconference system employing h.221 frames - Google Patents

Multipoint teleconference system employing h.221 frames

Info

Publication number
CA2073925A1
CA2073925A1 CA2073925A CA2073925A CA2073925A1 CA 2073925 A1 CA2073925 A1 CA 2073925A1 CA 2073925 A CA2073925 A CA 2073925A CA 2073925 A CA2073925 A CA 2073925A CA 2073925 A1 CA2073925 A1 CA 2073925A1
Authority
CA
Canada
Prior art keywords
multipoint teleconference
frames
teleconference system
system employing
communication frame
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
CA2073925A
Other languages
French (fr)
Other versions
CA2073925C (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
Yoji Shibata
Masaaki Takizawa
Hitachi, Ltd.
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 Yoji Shibata, Masaaki Takizawa, Hitachi, Ltd. filed Critical Yoji Shibata
Publication of CA2073925A1 publication Critical patent/CA2073925A1/en
Application granted granted Critical
Publication of CA2073925C publication Critical patent/CA2073925C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H04M3/562—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities where the conference facilities are distributed
    • 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
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/147—Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals
    • 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
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/15—Conference systems
    • H04N7/152—Multipoint control units therefor
    • 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 enters control information for controlling a multipoint teleconference, into a predetermined area within the communication frame, and it relays the resulting communication frame to the next terminal.
CA002073925A 1991-07-15 1992-07-15 Multipoint teleconference system employing h.221 frames Expired - Fee Related CA2073925C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3-174031 1991-07-15
JP17403191A JP3308563B2 (en) 1991-07-15 1991-07-15 Multipoint video conference system

Publications (2)

Publication Number Publication Date
CA2073925A1 true CA2073925A1 (en) 1993-01-16
CA2073925C CA2073925C (en) 1998-02-03

Family

ID=15971424

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002073925A Expired - Fee Related CA2073925C (en) 1991-07-15 1992-07-15 Multipoint teleconference system employing h.221 frames

Country Status (6)

Country Link
US (3) US5402418A (en)
EP (1) EP0523629B1 (en)
JP (1) JP3308563B2 (en)
AU (1) AU644532B2 (en)
CA (1) CA2073925C (en)
DE (1) DE69214036T2 (en)

Families Citing this family (92)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6847611B1 (en) * 1990-12-10 2005-01-25 At&T Corp. Traffic management for frame relay switched data service
EP0500091B1 (en) * 1991-02-20 1998-07-15 Hitachi, Ltd. Television telephone
US5587735A (en) * 1991-07-24 1996-12-24 Hitachi, Ltd. Video telephone
JP3308563B2 (en) * 1991-07-15 2002-07-29 株式会社日立製作所 Multipoint video conference system
AU645914B2 (en) 1991-07-15 1994-01-27 Hitachi Limited Picture codec and teleconference terminal equipment
EP0523617B1 (en) 1991-07-15 1997-10-01 Hitachi, Ltd. Teleconference terminal equipment
JPH05327935A (en) * 1992-05-25 1993-12-10 Canon Inc Multi-media communication device
EP1569451A3 (en) 1992-09-21 2006-11-29 Canon Kabushiki Kaisha Communications apparatus and method of communication using the same
US5434850A (en) 1993-06-17 1995-07-18 Skydata Corporation Frame relay protocol-based multiplex switching scheme for satellite
US6771617B1 (en) 1993-06-17 2004-08-03 Gilat Satellite Networks, Ltd. Frame relay protocol-based multiplex switching scheme for satellite mesh network
US5574934A (en) * 1993-11-24 1996-11-12 Intel Corporation Preemptive priority-based transmission of signals using virtual channels
US5579389A (en) * 1993-11-24 1996-11-26 Intel Corporation Histogram-based processing of audio signals
US5949891A (en) * 1993-11-24 1999-09-07 Intel Corporation Filtering audio signals from a combined microphone/speaker earpiece
US5862388A (en) * 1993-11-24 1999-01-19 Intel Corporation Interrupt-time processing of received signals
US5631967A (en) * 1993-11-24 1997-05-20 Intel Corporation Processing audio signals using a state variable
US5600797A (en) * 1993-11-24 1997-02-04 Intel Corporation System for identifying new client and allocating bandwidth thereto by monitoring transmission of message received periodically from client computers informing of their current status
US5592547A (en) * 1993-11-24 1997-01-07 Intel Corporation Processing audio signals using a discrete state machine
US5566238A (en) * 1993-11-24 1996-10-15 Intel Corporation Distributed processing of audio signals
US5524110A (en) * 1993-11-24 1996-06-04 Intel Corporation Conferencing over multiple transports
US5809237A (en) * 1993-11-24 1998-09-15 Intel Corporation Registration of computer-based conferencing system
WO1995015047A2 (en) * 1993-11-24 1995-06-01 Intel Corporation Audio and video subsystems for computer-based conferencing system
US6125398A (en) * 1993-11-24 2000-09-26 Intel Corporation Communications subsystem for computer-based conferencing system using both ISDN B channels for transmission
US5673393A (en) * 1993-11-24 1997-09-30 Intel Corporation Managing bandwidth over a computer network having a management computer that allocates bandwidth to client computers upon request
US5754765A (en) * 1993-11-24 1998-05-19 Intel Corporation Automatic transport detection by attempting to establish communication session using list of possible transports and corresponding media dependent modules
US5490247A (en) * 1993-11-24 1996-02-06 Intel Corporation Video subsystem for computer-based conferencing system
US5506954A (en) * 1993-11-24 1996-04-09 Intel Corporation PC-based conferencing system
GB2284968A (en) * 1993-12-18 1995-06-21 Ibm Audio conferencing system
DE4344345A1 (en) * 1993-12-23 1994-05-19 Siemens Ag Subscriber appts. connection system for existing call - transfers call request to network mode at which call exists with automatic patching through of call to new subscriber
US6345390B1 (en) 1993-12-28 2002-02-05 Hitachi Denshi Kabushiki Kaisha Bidirectional digital signal transmission system and repeater for the same
US6009305A (en) * 1993-12-28 1999-12-28 Hitachi Denshi Kabushiki Kaisha Digital video signal multiplex transmission system
US5701581A (en) * 1993-12-28 1997-12-23 Hitachi Denshi Kabushiki Kaisha Method for bidirectionally transmitting digital video signal and digital video signal bidirectional transmission system
DE4408738A1 (en) * 1994-03-15 1995-09-21 Sel Alcatel Ag Communication system
IT1273137B (en) * 1994-04-13 1997-07-04 Sip PERIPHERAL UNIT FOR MULTIVIDEOCONFERENCE VIA SATELLITE
US5586257A (en) * 1994-05-05 1996-12-17 Perlman; Stephen G. Network architecture to support multiple site real-time video games
NL9400750A (en) * 1994-05-06 1995-12-01 Nederland Ptt Coupling device for coupling a terminal to a generating device, system and methods.
US5555017A (en) * 1994-07-08 1996-09-10 Lucent Technologies Inc. Seamless multimedia conferencing system using an enhanced multipoint control unit
US5625407A (en) * 1994-07-08 1997-04-29 Lucent Technologies Inc. Seamless multimedia conferencing system using an enhanced multipoint control unit and enhanced endpoint devices
US5473363A (en) * 1994-07-26 1995-12-05 Motorola, Inc. System, method and multipoint control unit for multipoint multimedia conferencing
US5802281A (en) 1994-09-07 1998-09-01 Rsi Systems, Inc. Peripheral audio/video communication system that interfaces with a host computer and determines format of coded audio/video signals
JPH0888632A (en) * 1994-09-20 1996-04-02 Canon Inc Inter-multi-point communication system and inter-multi-point communication method
US7349976B1 (en) 1994-11-30 2008-03-25 Realnetworks, Inc. Audio-on-demand communication system
US5793980A (en) 1994-11-30 1998-08-11 Realnetworks, Inc. Audio-on-demand communication system
US5821995A (en) * 1994-12-23 1998-10-13 Hitachi Denshi Kabushiki Kaisha Method and apparatus for controlling transmission of multiplexed video signals
DE59608561D1 (en) * 1995-04-13 2002-02-14 Siemens Ag METHOD AND DEVICE FOR STORING, SEARCHING AND PLAYING INFORMATION FROM A MULTIMEDIA ELECTRONIC POSTSYSTEM
US5796424A (en) * 1995-05-01 1998-08-18 Bell Communications Research, Inc. System and method for providing videoconferencing services
GB2303517A (en) * 1995-07-20 1997-02-19 Plessey Telecomm Teleconferencing
GB2303516A (en) * 1995-07-20 1997-02-19 Plessey Telecomm Teleconferencing
JPH0946437A (en) * 1995-07-31 1997-02-14 Kokusai Electric Co Ltd Simultaneous command transmission method
JPH09102831A (en) * 1995-07-31 1997-04-15 Canon Inc System, equipment and method for communicating
GB9519657D0 (en) * 1995-09-27 1995-11-29 Plessey Telecomm Video telephony call connection
US5764277A (en) * 1995-11-08 1998-06-09 Bell Communications Research, Inc. Group-of-block based video signal combining for multipoint continuous presence video conferencing
JP2720857B2 (en) * 1995-11-21 1998-03-04 日本電気株式会社 Multipoint video conference controller
JPH09191350A (en) * 1996-01-10 1997-07-22 Canon Inc Multimedia communication equipment
US6122259A (en) * 1996-02-27 2000-09-19 Hitachi, Ltd. Video conference equipment and multipoint video conference system using the same
DE19610010A1 (en) * 1996-03-14 1997-09-18 Sel Alcatel Ag Device and service for the transmission of video image data and device for the transmission of request signals
AU2102297A (en) * 1996-03-28 1997-10-17 British Telecommunications Public Limited Company Video processing
US5983299A (en) * 1996-10-18 1999-11-09 Samsung Electronics Co., Ltd. Priority request and bypass bus
US6091714A (en) * 1997-04-30 2000-07-18 Sensel; Steven D. Programmable distributed digital switch system
US5930237A (en) * 1997-06-30 1999-07-27 Ag Communication Systems Corporation Video conference system with ATM cell reuse
US6081524A (en) 1997-07-03 2000-06-27 At&T Corp. Frame relay switched data service
US6356294B1 (en) * 1998-08-11 2002-03-12 8×8, Inc. Multi-point communication arrangement and method
US6414707B1 (en) 1998-10-16 2002-07-02 At&T Corp. Apparatus and method for incorporating virtual video conferencing environments
EP1126710A1 (en) * 2000-02-15 2001-08-22 Telefonaktiebolaget L M Ericsson (Publ) A method and an apparatus for video mixing of bit streams
US7158534B2 (en) * 2000-11-30 2007-01-02 Imajet Communications, Inc. Unified distributed architecture for a multi-point video conference and interactive broadcast systems
DE10062342A1 (en) * 2000-12-14 2002-07-11 Eads Defence & Security Ntwk Method and device for implementing voice conferences
TW561451B (en) * 2001-07-27 2003-11-11 At Chip Corp Audio mixing method and its device
US6966035B1 (en) 2001-09-19 2005-11-15 Hewlett-Packard Development Company, L.P. Frame for communicating expressive information for meetings
US6922718B2 (en) 2002-02-01 2005-07-26 Dell Products L.P. Method and system for participating locations in a multi-point video conference
JP2003259325A (en) * 2002-02-26 2003-09-12 Yazaki Corp Ring conference system and terminal
DE10240437A1 (en) * 2002-09-02 2004-03-18 Gap Ag Gsm Applikationen Und Produkte Mobile terminal for a telecommunication network offering a telephone conference service
KR100581060B1 (en) * 2003-11-12 2006-05-22 한국전자통신연구원 Apparatus and method for transmission synchronized the five senses with A/V data
NO20040978A (en) * 2004-03-05 2005-06-13 Tandberg Telecom As Procedure for uninterrupted conference call
US7702405B2 (en) * 2004-06-02 2010-04-20 Standard Microsystems Corporation System and method for transferring non-compliant packetized and streaming data into and from a multimedia device coupled to a network across which compliant data is sent
US7870192B2 (en) * 2004-12-16 2011-01-11 International Business Machines Corporation Integrated voice and video conferencing management
US7899170B2 (en) 2005-04-28 2011-03-01 Apple Inc. Multi-participant conference setup
US7817180B2 (en) * 2005-04-28 2010-10-19 Apple Inc. Video processing in a multi-participant video conference
US8861701B2 (en) * 2005-04-28 2014-10-14 Apple Inc. Multi-participant conference adjustments
US7864209B2 (en) * 2005-04-28 2011-01-04 Apple Inc. Audio processing in a multi-participant conference
US7692682B2 (en) 2005-04-28 2010-04-06 Apple Inc. Video encoding in a video conference
US7653250B2 (en) * 2005-04-28 2010-01-26 Apple Inc. Adjusting sampling rate for encoding
US7949117B2 (en) * 2005-04-28 2011-05-24 Apple Inc. Heterogeneous video conferencing
JP2007318556A (en) * 2006-05-26 2007-12-06 Hitachi Communication Technologies Ltd Multipoint video conference system in communication network
US20080165708A1 (en) * 2007-01-08 2008-07-10 Avaya Technology Llc Multimedia conferencing method and signal
US8094667B2 (en) * 2008-07-18 2012-01-10 Cisco Technology, Inc. RTP video tunneling through H.221
JP5297225B2 (en) * 2009-02-20 2013-09-25 岡野電線株式会社 Communication device and communication system using the communication device
US8570907B2 (en) 2010-04-07 2013-10-29 Apple Inc. Multi-network architecture for media data exchange
CN102404131B (en) * 2010-07-29 2015-03-25 株式会社理光 Communication terminal, communication management system, communication system, and sound input part registering method
US8711736B2 (en) 2010-09-16 2014-04-29 Apple Inc. Audio processing in a multi-participant conference
JP5353989B2 (en) 2011-02-28 2013-11-27 株式会社リコー Transmission management device, transmission terminal, transmission system, transmission management method, transmission terminal control method, transmission management program, and transmission terminal control program
EP2602708B1 (en) * 2011-12-06 2015-09-16 Vestel Elektronik Sanayi ve Ticaret A.S. A display system
US10908769B2 (en) 2018-04-09 2021-02-02 Spatial Systems Inc. Augmented reality computing environments—immersive media browser
CN111209475B (en) * 2019-12-27 2022-03-15 武汉大学 Interest point recommendation method and device based on space-time sequence and social embedded ranking

Family Cites Families (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE349709C (en) * 1920-01-20 1922-03-07 Ernst Dirschoweit Insert for centrifugal drums
US4289932A (en) * 1979-10-15 1981-09-15 Reed Roger R Conferencing communications system
DE2952660C2 (en) * 1979-12-28 1983-07-14 Antonin 8000 München Danek Device for balancing torques
GB2075114B (en) * 1980-05-01 1983-09-07 Quick Set Inc Bulletproof pan and tilt camera housing
JPS5845494U (en) * 1981-09-21 1983-03-26 川添　道雄 Pan head
US4516156A (en) * 1982-03-15 1985-05-07 Satellite Business Systems Teleconferencing method and system
DE3334428A1 (en) * 1983-09-23 1985-04-11 Hans H. 5000 Köln Heller Carriage with a camera
US4531024A (en) * 1983-10-25 1985-07-23 At&T Bell Laboratories Multilocation video conference terminal including video switching contention control
US4574374A (en) * 1983-10-25 1986-03-04 At&T Bell Laboratories Multilocation video conference terminal including rapid video switching
US4847829A (en) * 1985-04-08 1989-07-11 Datapoint Corporation Video conferencing network
US4710917A (en) * 1985-04-08 1987-12-01 Datapoint Corporation Video conferencing network
JPS6432243A (en) * 1987-07-29 1989-02-02 Kyocera Corp Camera
IT1215490B (en) * 1987-05-14 1990-02-14 Sgs Microelettronica Spa METHOD OF ATTENUATION OF THE ECHO SIGNAL IN CONVERSION CIRCUITS, SO CALLED BY TELEPHONE FORKS, INTENDED FOR TELEPHONE CONFERENCES, AND EQUIPMENT OPERATING ACCORDING TO SUCH METHOD.
JPH01241959A (en) * 1988-03-23 1989-09-26 Fujitsu Ltd Communication system between multi-point
DE3823219C1 (en) * 1988-07-08 1989-05-18 Telenorma Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt, De
JPH0227857A (en) * 1988-07-18 1990-01-30 Hitachi Ltd Video conference method, video conference terminal equipment, notifying method and data terminal equipment
JPH0538338Y2 (en) * 1988-07-29 1993-09-28
US4882743A (en) * 1988-08-01 1989-11-21 American Telephone And Telegraph Multi-location video conference system
JP2821601B2 (en) * 1988-10-19 1998-11-05 積水ハウス株式会社 Exterior wall fixing device
JPH02275825A (en) * 1989-01-09 1990-11-09 Taisho Pharmaceut Co Ltd Medicine for acquired immune deficiency syndrome
JP2863180B2 (en) * 1989-01-20 1999-03-03 東京電力株式会社 Video phone
US5014267A (en) * 1989-04-06 1991-05-07 Datapoint Corporation Video conferencing network
US4935953A (en) * 1989-04-27 1990-06-19 International Business Machines Corporation Cyclic video region transmission for videoconferencing systems
US5003532A (en) * 1989-06-02 1991-03-26 Fujitsu Limited Multi-point conference system
JPH0385837A (en) * 1989-08-29 1991-04-11 Nec Corp Multi-point video conference equipment
US5020098A (en) * 1989-11-03 1991-05-28 At&T Bell Laboratories Telephone conferencing arrangement
US5305097A (en) * 1989-12-20 1994-04-19 Canon Kabushiki Kaisha Communicating apparatus having a calling party number display device
JP2793308B2 (en) * 1989-12-21 1998-09-03 株式会社日立製作所 Dialogue system
NO169209C (en) * 1989-12-22 1992-05-20 Alcatel Stk As PROCEDURE AND SYSTEM FOR ESTABLISHING CONFERENCE CONNECTION.
US5175727A (en) * 1990-04-16 1992-12-29 Maher John W Communication system network interconnecting a plurality of communication systems
JPH0433490A (en) * 1990-05-30 1992-02-04 Sony Corp Television conference system
US5062136A (en) * 1990-09-12 1991-10-29 The United States Of America As Represented By The Secretary Of The Navy Telecommunications system and method
JPH04150686A (en) * 1990-10-15 1992-05-25 Sharp Corp Video telephone system
US5341374A (en) * 1991-03-01 1994-08-23 Trilan Systems Corporation Communication network integrating voice data and video with distributed call processing
US5268904A (en) * 1991-04-24 1993-12-07 Ricoh Company, Ltd. ISDN terminal equipment control method
JP3308563B2 (en) * 1991-07-15 2002-07-29 株式会社日立製作所 Multipoint video conference system
JP3308562B2 (en) * 1991-07-15 2002-07-29 株式会社日立製作所 Video conference terminal

Also Published As

Publication number Publication date
JPH0522322A (en) 1993-01-29
DE69214036D1 (en) 1996-10-31
EP0523629A1 (en) 1993-01-20
AU644532B2 (en) 1993-12-09
US5604738A (en) 1997-02-18
EP0523629B1 (en) 1996-09-25
DE69214036T2 (en) 1997-05-15
US5402418A (en) 1995-03-28
AU1967592A (en) 1993-03-11
JP3308563B2 (en) 2002-07-29
CA2073925C (en) 1998-02-03
US5970054A (en) 1999-10-19

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