JPS50141904A - - Google Patents

Info

Publication number
JPS50141904A
JPS50141904A JP49048683A JP4868374A JPS50141904A JP S50141904 A JPS50141904 A JP S50141904A JP 49048683 A JP49048683 A JP 49048683A JP 4868374 A JP4868374 A JP 4868374A JP S50141904 A JPS50141904 A JP S50141904A
Authority
JP
Japan
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
JP49048683A
Other versions
JPS5411203B2 (ja
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 filed Critical
Priority to JP4868374A priority Critical patent/JPS5411203B2/ja
Priority to US549192A priority patent/US3925618A/en
Priority to SE7502095A priority patent/SE400442B/xx
Priority to DE19752508797 priority patent/DE2508797C3/de
Priority to GB8717/75A priority patent/GB1485321A/en
Priority to CA222,242A priority patent/CA1003588A/en
Publication of JPS50141904A publication Critical patent/JPS50141904A/ja
Publication of JPS5411203B2 publication Critical patent/JPS5411203B2/ja
Expired 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)
  • Prepayment Telephone Systems (AREA)
  • Circuit For Audible Band Transducer (AREA)
JP4868374A 1974-05-02 1974-05-02 Expired JPS5411203B2 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP4868374A JPS5411203B2 (ja) 1974-05-02 1974-05-02
US549192A US3925618A (en) 1974-05-02 1975-02-12 Voice switch circuits for use in loudspeaking telephone circuits
SE7502095A SE400442B (sv) 1974-05-02 1975-02-25 Talomkopplingskrets for anvendning i en hogtalartelefonkrets
DE19752508797 DE2508797C3 (de) 1974-05-02 1975-02-28 Schaltungsanordnung für eine sprachgesteuerte Freisprecheinrichtung
GB8717/75A GB1485321A (en) 1974-05-02 1975-03-03 Voice switch circuits for use in loudspeaking telephone circuits
CA222,242A CA1003588A (en) 1974-05-02 1975-03-17 Voice switch circuits for use in loudspeaking telephone circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4868374A JPS5411203B2 (ja) 1974-05-02 1974-05-02

Publications (2)

Publication Number Publication Date
JPS50141904A true JPS50141904A (ja) 1975-11-15
JPS5411203B2 JPS5411203B2 (ja) 1979-05-12

Family

ID=12810108

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4868374A Expired JPS5411203B2 (ja) 1974-05-02 1974-05-02

Country Status (5)

Country Link
US (1) US3925618A (ja)
JP (1) JPS5411203B2 (ja)
CA (1) CA1003588A (ja)
GB (1) GB1485321A (ja)
SE (1) SE400442B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5392605A (en) * 1977-01-25 1978-08-14 Nippon Telegr & Teleph Corp <Ntt> Voice switch circuit

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2638286C3 (de) * 1976-08-25 1979-03-01 Dasy Inter S.A., Genf (Schweiz) Schaltungsanordnung für ein Freisprechertelefon
US4506381A (en) * 1981-12-29 1985-03-19 Mitsubishi Denki Kabushiki Kaisha Aural transmitter device
US4465902A (en) * 1982-10-08 1984-08-14 Zenith Electronics Corporation Digital space phone system
JPS5976160U (ja) * 1982-11-12 1984-05-23 富士通株式会社 拡声会議電話装置
US4712231A (en) * 1984-04-06 1987-12-08 Shure Brothers, Inc. Teleconference system
CA1226981A (en) * 1984-10-30 1987-09-15 Novatel Communications Ltd. Two way telephone communication system
US4715063A (en) * 1985-08-20 1987-12-22 Motorola, Inc. Speakerphone for radio and landline telephones
WO1987001255A1 (en) * 1985-08-20 1987-02-26 Motorola, Inc. Speakerphone for radio and landline telephones
US4724540A (en) * 1986-09-02 1988-02-09 Motorola, Inc. Speakerphone with fast idle mode
USRE36934E (en) * 1988-07-19 2000-10-31 Sgs-Thomson Microelectronics S.A. Control device for a hands-free telephone set
FR2641150B1 (ja) * 1988-12-28 1991-04-19 Sgs Thomson Microelectronics
US5058153A (en) * 1989-12-27 1991-10-15 Carew Edward C Noise mitigation and mode switching in communications terminals such as telephones
US5170430A (en) * 1991-01-04 1992-12-08 Schuh Peter O Voice-switched handset receive amplifier
JPH06338934A (ja) * 1993-05-25 1994-12-06 Exar Corp 事象駆動型制御回路を有するスピーカーホーン
JP2606167B2 (ja) * 1994-12-07 1997-04-30 日本電気株式会社 電話機
US6662027B2 (en) * 2001-03-16 2003-12-09 Motorola, Inc. Method of arbitrating speakerphone operation in a portable communication device for eliminating false arbitration due to echo
US6754337B2 (en) * 2002-01-25 2004-06-22 Acoustic Technologies, Inc. Telephone having four VAD circuits
JP2010062663A (ja) * 2008-09-01 2010-03-18 Sony Ericsson Mobilecommunications Japan Inc 音声信号処理装置、音声信号処理方法、及び、通信端末

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4826304A (ja) * 1971-08-07 1973-04-06

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6912967A (ja) * 1968-08-29 1970-03-03
SE339704B (ja) * 1970-12-22 1971-10-18 Ericsson Telefon Ab L M
US3751602A (en) * 1971-08-13 1973-08-07 Bell Telephone Labor Inc Loudspeaking telephone
US3725585A (en) * 1972-03-21 1973-04-03 Itt Loudspeaking telephone station circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4826304A (ja) * 1971-08-07 1973-04-06

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5392605A (en) * 1977-01-25 1978-08-14 Nippon Telegr & Teleph Corp <Ntt> Voice switch circuit
JPS5551380B2 (ja) * 1977-01-25 1980-12-24

Also Published As

Publication number Publication date
DE2508797A1 (de) 1975-11-06
CA1003588A (en) 1977-01-11
SE7502095L (sv) 1975-11-03
JPS5411203B2 (ja) 1979-05-12
GB1485321A (en) 1977-09-08
SE400442B (sv) 1978-03-20
US3925618A (en) 1975-12-09
DE2508797B2 (de) 1977-02-10

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