JPS58162157A - 拡声電話機 - Google Patents

拡声電話機

Info

Publication number
JPS58162157A
JPS58162157A JP4594982A JP4594982A JPS58162157A JP S58162157 A JPS58162157 A JP S58162157A JP 4594982 A JP4594982 A JP 4594982A JP 4594982 A JP4594982 A JP 4594982A JP S58162157 A JPS58162157 A JP S58162157A
Authority
JP
Japan
Prior art keywords
circuit
receiving
control
volume
control circuit
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
JP4594982A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6352830B2 (enrdf_load_stackoverflow
Inventor
Hisashi Fujisaki
久司 藤崎
Tsugio Maru
次夫 丸
Sadayuki Kurosaki
黒崎　貞之
Masakazu Nishino
正和 西野
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
NEC Corp
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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4594982A priority Critical patent/JPS58162157A/ja
Publication of JPS58162157A publication Critical patent/JPS58162157A/ja
Publication of JPS6352830B2 publication Critical patent/JPS6352830B2/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)
JP4594982A 1982-03-23 1982-03-23 拡声電話機 Granted JPS58162157A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4594982A JPS58162157A (ja) 1982-03-23 1982-03-23 拡声電話機

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4594982A JPS58162157A (ja) 1982-03-23 1982-03-23 拡声電話機

Publications (2)

Publication Number Publication Date
JPS58162157A true JPS58162157A (ja) 1983-09-26
JPS6352830B2 JPS6352830B2 (enrdf_load_stackoverflow) 1988-10-20

Family

ID=12733524

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4594982A Granted JPS58162157A (ja) 1982-03-23 1982-03-23 拡声電話機

Country Status (1)

Country Link
JP (1) JPS58162157A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60182249A (ja) * 1984-02-29 1985-09-17 Nippon Telegr & Teleph Corp <Ntt> 通話路利得制御方法
JPS61161856A (ja) * 1985-01-11 1986-07-22 Matsushita Electric Ind Co Ltd 拡声電話装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56117463A (en) * 1980-02-22 1981-09-14 Nippon Telegr & Teleph Corp <Ntt> Loudspeaking telephone device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56117463A (en) * 1980-02-22 1981-09-14 Nippon Telegr & Teleph Corp <Ntt> Loudspeaking telephone device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60182249A (ja) * 1984-02-29 1985-09-17 Nippon Telegr & Teleph Corp <Ntt> 通話路利得制御方法
JPS61161856A (ja) * 1985-01-11 1986-07-22 Matsushita Electric Ind Co Ltd 拡声電話装置

Also Published As

Publication number Publication date
JPS6352830B2 (enrdf_load_stackoverflow) 1988-10-20

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