JPS6233787B2 - - Google Patents

Info

Publication number
JPS6233787B2
JPS6233787B2 JP56073225A JP7322581A JPS6233787B2 JP S6233787 B2 JPS6233787 B2 JP S6233787B2 JP 56073225 A JP56073225 A JP 56073225A JP 7322581 A JP7322581 A JP 7322581A JP S6233787 B2 JPS6233787 B2 JP S6233787B2
Authority
JP
Japan
Prior art keywords
circuit
output
microphone
audio
speaker
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.)
Expired
Application number
JP56073225A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57188169A (en
Inventor
Shoichi Sato
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.)
Toa Corp
Original Assignee
Toa 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 Toa Electric Co Ltd filed Critical Toa Electric Co Ltd
Priority to JP56073225A priority Critical patent/JPS57188169A/ja
Publication of JPS57188169A publication Critical patent/JPS57188169A/ja
Publication of JPS6233787B2 publication Critical patent/JPS6233787B2/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)
JP56073225A 1981-05-14 1981-05-14 Audio switch device Granted JPS57188169A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56073225A JPS57188169A (en) 1981-05-14 1981-05-14 Audio switch device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56073225A JPS57188169A (en) 1981-05-14 1981-05-14 Audio switch device

Publications (2)

Publication Number Publication Date
JPS57188169A JPS57188169A (en) 1982-11-19
JPS6233787B2 true JPS6233787B2 (en, 2012) 1987-07-22

Family

ID=13512018

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56073225A Granted JPS57188169A (en) 1981-05-14 1981-05-14 Audio switch device

Country Status (1)

Country Link
JP (1) JPS57188169A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3579210A1 (en) 2018-06-05 2019-12-11 Kazuto Nakamura Security system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3579210A1 (en) 2018-06-05 2019-12-11 Kazuto Nakamura Security system

Also Published As

Publication number Publication date
JPS57188169A (en) 1982-11-19

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