JPS5772458A - Conference call device - Google Patents

Conference call device

Info

Publication number
JPS5772458A
JPS5772458A JP14682580A JP14682580A JPS5772458A JP S5772458 A JPS5772458 A JP S5772458A JP 14682580 A JP14682580 A JP 14682580A JP 14682580 A JP14682580 A JP 14682580A JP S5772458 A JPS5772458 A JP S5772458A
Authority
JP
Japan
Prior art keywords
terminal
signal
transmission right
circuit
conference call
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.)
Pending
Application number
JP14682580A
Other languages
Japanese (ja)
Inventor
Hiroyuki Sugano
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP14682580A priority Critical patent/JPS5772458A/en
Publication of JPS5772458A publication Critical patent/JPS5772458A/en
Pending 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/50—Aspects of automatic or semi-automatic exchanges related to audio conference
    • H04M2203/5018—Initiating a conference during a two-party conversation, i.e. three-party-service or three-way-call

Abstract

PURPOSE:To form a conference call device where the conversation of 1:n is possible from any of terminals which are so connected that an optional terminal can request the transmission right with all connection lines set to the neutral state by the abandonment of the transmission right of an originating terminal. CONSTITUTION:When a selecting signal indicating conference communication service request is sent from a terminal 10, an exchange 2 hunts a conference call device 3, and when a call signal is transmitted to a line 40, the device 3 detects this call signal to return a confirmation signal to the exchange 2, thus connecting the terminal 10 and the path 40. Next, when the selecting number from the terminal is received by a receiving circuit 32, plural lines 41-4n and terminals 11-1n are connected by a control circuit 33, and the conference call device 3 defines the originating terminal 10 as the owner of the transmission right, and the message from the terminal 10 is stored in a storage circuit 35 and is sent to terminating terminals 11-1n form the circuit 33. When an abandonment signal is detected by a monitor circuit 36 for transmission right abandonment signal, all connection lines are set to the neutral state, and a character monitor circuit 37 gives the transmission right to the terminal of a line on which the transmission right request signal is detected first.
JP14682580A 1980-10-22 1980-10-22 Conference call device Pending JPS5772458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14682580A JPS5772458A (en) 1980-10-22 1980-10-22 Conference call device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14682580A JPS5772458A (en) 1980-10-22 1980-10-22 Conference call device

Publications (1)

Publication Number Publication Date
JPS5772458A true JPS5772458A (en) 1982-05-06

Family

ID=15416373

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14682580A Pending JPS5772458A (en) 1980-10-22 1980-10-22 Conference call device

Country Status (1)

Country Link
JP (1) JPS5772458A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59138158A (en) * 1983-01-24 1984-08-08 ウエスタ−ン　エレクトリツク　カムパニ−，インコ−ポレ−テツド Conference telephone device and its controlling method
JPH0267840A (en) * 1988-09-02 1990-03-07 Mirai Biru Kenkyu Kaihatsu Kk Lan system
JPH02181538A (en) * 1989-01-05 1990-07-16 Nippon Telegr & Teleph Corp <Ntt> Inter-multipoint communication control system
JPH03101434A (en) * 1989-09-14 1991-04-26 Nec Corp Transmission right transfer control system in multi-point conference system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51127607A (en) * 1975-04-30 1976-11-06 Toshiba Corp Data transmission system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51127607A (en) * 1975-04-30 1976-11-06 Toshiba Corp Data transmission system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59138158A (en) * 1983-01-24 1984-08-08 ウエスタ−ン　エレクトリツク　カムパニ−，インコ−ポレ−テツド Conference telephone device and its controlling method
US4544804A (en) * 1983-01-24 1985-10-01 At&T Bell Laboratories Conference control transfer arrangement
JPH0267840A (en) * 1988-09-02 1990-03-07 Mirai Biru Kenkyu Kaihatsu Kk Lan system
JPH02181538A (en) * 1989-01-05 1990-07-16 Nippon Telegr & Teleph Corp <Ntt> Inter-multipoint communication control system
JPH03101434A (en) * 1989-09-14 1991-04-26 Nec Corp Transmission right transfer control system in multi-point conference system

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