JPS6221436B2 - - Google Patents

Info

Publication number
JPS6221436B2
JPS6221436B2 JP54131448A JP13144879A JPS6221436B2 JP S6221436 B2 JPS6221436 B2 JP S6221436B2 JP 54131448 A JP54131448 A JP 54131448A JP 13144879 A JP13144879 A JP 13144879A JP S6221436 B2 JPS6221436 B2 JP S6221436B2
Authority
JP
Japan
Prior art keywords
audio amplifier
call
trunk
audio
gain
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
JP54131448A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5656087A (en
Inventor
Yoshio Koda
Juji Matsuo
Masaharu Murata
Masao Domae
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.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Nippon 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 Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP13144879A priority Critical patent/JPS5656087A/ja
Publication of JPS5656087A publication Critical patent/JPS5656087A/ja
Publication of JPS6221436B2 publication Critical patent/JPS6221436B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
JP13144879A 1979-10-12 1979-10-12 Trunk circuit Granted JPS5656087A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13144879A JPS5656087A (en) 1979-10-12 1979-10-12 Trunk circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13144879A JPS5656087A (en) 1979-10-12 1979-10-12 Trunk circuit

Publications (2)

Publication Number Publication Date
JPS5656087A JPS5656087A (en) 1981-05-16
JPS6221436B2 true JPS6221436B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1987-05-12

Family

ID=15058188

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13144879A Granted JPS5656087A (en) 1979-10-12 1979-10-12 Trunk circuit

Country Status (1)

Country Link
JP (1) JPS5656087A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10749022B2 (en) 2018-09-14 2020-08-18 Kabushiki Kaisha Toshiba Semiconductor device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS587965A (ja) * 1981-07-07 1983-01-17 Masao Uchiumi 転送電話回路

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5283104A (en) * 1975-12-31 1977-07-11 Fujitsu Ltd Switching system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10749022B2 (en) 2018-09-14 2020-08-18 Kabushiki Kaisha Toshiba Semiconductor device

Also Published As

Publication number Publication date
JPS5656087A (en) 1981-05-16

Similar Documents

Publication Publication Date Title
US4320257A (en) Compensation of transmission losses in a telephone system
JPS6221436B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JPH11196178A (ja) レベル自動調整装置
JPS6038962A (ja) 会議用電話装置
US5898773A (en) Telephone apparatus with call transfer function and with improved arrangement for hand-free operation
JPS5936466A (ja) 電話転送装置
JP3162461B2 (ja) 可変遅延型エコーキャンセラ
JP4238473B2 (ja) デジタル交換機
JPS61225995A (ja) ２線式双方向自動利得制御方式
JPS59144295A (ja) 自動式構内交換機における通話減衰量補償方式
JPH05316552A (ja) 公専接続における構内交換機の音声品質保証方式
JPH07123449A (ja) 自動利得制御機能付局線トランク
JP3319552B2 (ja) 電話装置
JP3003383B2 (ja) Ｐｂｘの音声品質保証装置
JPS6121665A (ja) トランク回路
JPH0746791B2 (ja) ハウリング抑圧回路
JPH0630454A (ja) 局線トランク
JPS6155293B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JPH06315050A (ja) 会議用電話装置
JPS63153993A (ja) ボタン電話装置
GB1602473A (en) Telephone systems providing conference facilities
JPH0210613B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JPS60264150A (ja) 電話転送装置
JPS61172471A (ja) 会議通話用拡声電話機の廻り込み防止方式
JPS60257648A (ja) 分岐・結合回路