JPS5793768A - Conference telephone system - Google Patents

Conference telephone system

Info

Publication number
JPS5793768A
JPS5793768A JP17035280A JP17035280A JPS5793768A JP S5793768 A JPS5793768 A JP S5793768A JP 17035280 A JP17035280 A JP 17035280A JP 17035280 A JP17035280 A JP 17035280A JP S5793768 A JPS5793768 A JP S5793768A
Authority
JP
Japan
Prior art keywords
terminal
terminals
loop
delay
telephone system
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
JP17035280A
Other languages
Japanese (ja)
Inventor
Kazuo Murano
Yoshihiro Tomita
Fumio Amano
Masami Koshikawa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17035280A priority Critical patent/JPS5793768A/en
Publication of JPS5793768A publication Critical patent/JPS5793768A/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
    • H04M3/561—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities by multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To realize a conference telephone system which is used even if the great number of conference members is present, by connecting a plurality of terminals with an unidirectional line in loop and making transmission through addition of voices of all subscribers with a common time slot at each terminal. CONSTITUTION:A plurality of terminals are connected with a line in loop as A B C D A. Each terminal device, e.g., a terminal A receives a synthesized voice of terminals A,B,C and D transmitted from the preceding terminal D and the audio signal of the terminal A before one period is removed and the audio signal of the terminal A developed newly is added and the resultant is transmitted to the next terminal B. A delay circuit DLY is a variable length delay and has a delay time equal to a time circulating the loop, and the audio mixing is made without any trouble by adjusting the delay time, even if the number of conference members changes.
JP17035280A 1980-12-03 1980-12-03 Conference telephone system Pending JPS5793768A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17035280A JPS5793768A (en) 1980-12-03 1980-12-03 Conference telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17035280A JPS5793768A (en) 1980-12-03 1980-12-03 Conference telephone system

Publications (1)

Publication Number Publication Date
JPS5793768A true JPS5793768A (en) 1982-06-10

Family

ID=15903333

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17035280A Pending JPS5793768A (en) 1980-12-03 1980-12-03 Conference telephone system

Country Status (1)

Country Link
JP (1) JPS5793768A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0238468A2 (en) * 1986-03-19 1987-09-23 Paul Gösta Wilhelm Rosen A communication system
JPH01241959A (en) * 1988-03-23 1989-09-26 Fujitsu Ltd Communication system between multi-point

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5665561A (en) * 1979-10-15 1981-06-03 Reed Roger R Conference telephone system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5665561A (en) * 1979-10-15 1981-06-03 Reed Roger R Conference telephone system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0238468A2 (en) * 1986-03-19 1987-09-23 Paul Gösta Wilhelm Rosen A communication system
JPH01241959A (en) * 1988-03-23 1989-09-26 Fujitsu Ltd Communication system between multi-point

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