JPS5392608A - Voice switch circuit - Google Patents

Voice switch circuit

Info

Publication number
JPS5392608A
JPS5392608A JP694877A JP694877A JPS5392608A JP S5392608 A JPS5392608 A JP S5392608A JP 694877 A JP694877 A JP 694877A JP 694877 A JP694877 A JP 694877A JP S5392608 A JPS5392608 A JP S5392608A
Authority
JP
Japan
Prior art keywords
switch circuit
voice switch
circuit
fet
transformer
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
JP694877A
Other languages
Japanese (ja)
Other versions
JPS5551382B2 (en
Inventor
Kunihiro Kato
Ryoichi Okayasu
Masakazu Nishino
Harumitsu Saito
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP694877A priority Critical patent/JPS5392608A/en
Publication of JPS5392608A publication Critical patent/JPS5392608A/en
Publication of JPS5551382B2 publication Critical patent/JPS5551382B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

PURPOSE:To make the circuit into an IC easily without using a transformer by constituting respective variable loss circuits of speech transmission and receiving sides by FET, etc.
JP694877A 1977-01-25 1977-01-25 Voice switch circuit Granted JPS5392608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP694877A JPS5392608A (en) 1977-01-25 1977-01-25 Voice switch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP694877A JPS5392608A (en) 1977-01-25 1977-01-25 Voice switch circuit

Publications (2)

Publication Number Publication Date
JPS5392608A true JPS5392608A (en) 1978-08-14
JPS5551382B2 JPS5551382B2 (en) 1980-12-24

Family

ID=11652446

Family Applications (1)

Application Number Title Priority Date Filing Date
JP694877A Granted JPS5392608A (en) 1977-01-25 1977-01-25 Voice switch circuit

Country Status (1)

Country Link
JP (1) JPS5392608A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298719A2 (en) * 1987-07-06 1989-01-11 Nec Corporation Loudspeaking telephone with a variable gain circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5052904A (en) * 1973-09-10 1975-05-10
JPS50159903A (en) * 1974-06-14 1975-12-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5052904A (en) * 1973-09-10 1975-05-10
JPS50159903A (en) * 1974-06-14 1975-12-24

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298719A2 (en) * 1987-07-06 1989-01-11 Nec Corporation Loudspeaking telephone with a variable gain circuit

Also Published As

Publication number Publication date
JPS5551382B2 (en) 1980-12-24

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