JPS5592066A - Antisinging system in conference service - Google Patents

Antisinging system in conference service

Info

Publication number
JPS5592066A
JPS5592066A JP16512578A JP16512578A JPS5592066A JP S5592066 A JPS5592066 A JP S5592066A JP 16512578 A JP16512578 A JP 16512578A JP 16512578 A JP16512578 A JP 16512578A JP S5592066 A JPS5592066 A JP S5592066A
Authority
JP
Japan
Prior art keywords
circuit
subscriber
telephone set
inputted
signals
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
JP16512578A
Other languages
Japanese (ja)
Other versions
JPS5829032B2 (en
Inventor
Kiyoshi Shibuya
Mitsutoshi Ayano
Takuto Kojima
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 JP53165125A priority Critical patent/JPS5829032B2/en
Publication of JPS5592066A publication Critical patent/JPS5592066A/en
Publication of JPS5829032B2 publication Critical patent/JPS5829032B2/en
Expired 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To make antisinging possible with a simple circuit by dividing signals, which come around the hybrid transformer of a subscriber's circuit, into two groups and by mixing them so that they may be cancelled by each other. CONSTITUTION:A part of the service signal sent from telephone set A to the transmission side of hybrid transformer HA of subscriber's circuit LA is leaked to the transmission side of hybrid transformers HB-HN of another telephone set subscriber's circuit, and all of the signal is inputted to mixer circuit M1 assigned to telephone set A through the transmission path of each transmission side and is mixed and is inputted to the receiving side of hybrid transformer HA of telephone set A, and a part of the signal is leaked to the transmission side to constitute a singing loop. When the number of participating subscribers is increased, the quantity of echo is incerased to cause danger of singing. Therefore, input ends for output signals from transformers HA-HN of participating subscriber's circuits are divided into two groups in respective input parts of mixer circuits M1-Mn, and signals inputted to one group are inverted for signals inputted to the other group, and they are mixed. Thus, singing is prevented by cancelling signals coming around by each other.
JP53165125A 1978-12-29 1978-12-29 Ringing prevention method for conference calls Expired JPS5829032B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53165125A JPS5829032B2 (en) 1978-12-29 1978-12-29 Ringing prevention method for conference calls

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53165125A JPS5829032B2 (en) 1978-12-29 1978-12-29 Ringing prevention method for conference calls

Publications (2)

Publication Number Publication Date
JPS5592066A true JPS5592066A (en) 1980-07-12
JPS5829032B2 JPS5829032B2 (en) 1983-06-20

Family

ID=15806379

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53165125A Expired JPS5829032B2 (en) 1978-12-29 1978-12-29 Ringing prevention method for conference calls

Country Status (1)

Country Link
JP (1) JPS5829032B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57119548A (en) * 1980-12-01 1982-07-26 Philips Nv Conference telephone system
FR2601836A1 (en) * 1986-07-15 1988-01-22 Provence Mediterranee Telecomm Multiconversation device
JPH03289251A (en) * 1990-04-03 1991-12-19 Iwatsu Electric Co Ltd Telephone conference equipment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60140541U (en) * 1984-02-29 1985-09-18 ブラザー工業株式会社 hot plate

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128905A (en) * 1974-03-22 1975-10-11

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128905A (en) * 1974-03-22 1975-10-11

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57119548A (en) * 1980-12-01 1982-07-26 Philips Nv Conference telephone system
JPH0241946B2 (en) * 1980-12-01 1990-09-20
FR2601836A1 (en) * 1986-07-15 1988-01-22 Provence Mediterranee Telecomm Multiconversation device
JPH03289251A (en) * 1990-04-03 1991-12-19 Iwatsu Electric Co Ltd Telephone conference equipment

Also Published As

Publication number Publication date
JPS5829032B2 (en) 1983-06-20

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