JPS55161455A - Voice mixing unit for service - Google Patents

Voice mixing unit for service

Info

Publication number
JPS55161455A
JPS55161455A JP7089479A JP7089479A JPS55161455A JP S55161455 A JPS55161455 A JP S55161455A JP 7089479 A JP7089479 A JP 7089479A JP 7089479 A JP7089479 A JP 7089479A JP S55161455 A JPS55161455 A JP S55161455A
Authority
JP
Japan
Prior art keywords
wire
voice mixing
terminals
mixing circuit
voice
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
JP7089479A
Other languages
Japanese (ja)
Inventor
Shigeru Aoyama
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7089479A priority Critical patent/JPS55161455A/en
Publication of JPS55161455A publication Critical patent/JPS55161455A/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

Landscapes

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

Abstract

PURPOSE:To reduce the number of trunk lines, by using a selector switch to mix voice signals from service entry telephone sets partially or overall. CONSTITUTION:Two wire-four wire converting circuits 8a-8i which convert two wire-system lines to the four wire system are connected to connection terminals 7a- 7i from the switch network of the exchange, and these circuits 8a-8i and input terminals 9a-9i of four wire-system lines connected to this network are connected to the input side of voice mixing circuit 11. Selector switch 23 is connected to output terminal 21 of voice mixing circuit 11, and the output of voice mixing circuit 11 or the input signal from the next-level exchange to mixed input terminal 22 is switched and is transmitted to two wire-system line terminals 7a-7i and four wire-system output terminals 10a-10i.
JP7089479A 1979-06-04 1979-06-04 Voice mixing unit for service Pending JPS55161455A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7089479A JPS55161455A (en) 1979-06-04 1979-06-04 Voice mixing unit for service

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7089479A JPS55161455A (en) 1979-06-04 1979-06-04 Voice mixing unit for service

Publications (1)

Publication Number Publication Date
JPS55161455A true JPS55161455A (en) 1980-12-16

Family

ID=13444685

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7089479A Pending JPS55161455A (en) 1979-06-04 1979-06-04 Voice mixing unit for service

Country Status (1)

Country Link
JP (1) JPS55161455A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156058A (en) * 1983-02-25 1984-09-05 Nippon Telegr & Teleph Corp <Ntt> Connecting system between multi-pair points

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156058A (en) * 1983-02-25 1984-09-05 Nippon Telegr & Teleph Corp <Ntt> Connecting system between multi-pair points
JPH0224426B2 (en) * 1983-02-25 1990-05-29 Nippon Telegraph & Telephone

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