DE69233473D1 - Rauschunterdrückungsschaltung - Google Patents

Rauschunterdrückungsschaltung

Info

Publication number
DE69233473D1
DE69233473D1 DE69233473T DE69233473T DE69233473D1 DE 69233473 D1 DE69233473 D1 DE 69233473D1 DE 69233473 T DE69233473 T DE 69233473T DE 69233473 T DE69233473 T DE 69233473T DE 69233473 D1 DE69233473 D1 DE 69233473D1
Authority
DE
Germany
Prior art keywords
noise reduction
reduction circuit
circuit
noise
reduction
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 - Fee Related
Application number
DE69233473T
Other languages
English (en)
Other versions
DE69233473T2 (de
Inventor
Yutaka Tomiyori
Tadashi Eguchi
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
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Publication of DE69233473D1 publication Critical patent/DE69233473D1/de
Application granted granted Critical
Publication of DE69233473T2 publication Critical patent/DE69233473T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
DE69233473T 1991-02-19 1992-02-19 Rauschunterdrückungsschaltung Expired - Fee Related DE69233473T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP03045463A JP3076072B2 (ja) 1991-02-19 1991-02-19 拡声電話装置および該装置に用いる騒音抑圧回路
JP4546391 1991-02-19

Publications (2)

Publication Number Publication Date
DE69233473D1 true DE69233473D1 (de) 2005-03-03
DE69233473T2 DE69233473T2 (de) 2006-02-16

Family

ID=12720065

Family Applications (2)

Application Number Title Priority Date Filing Date
DE69225258T Expired - Fee Related DE69225258T2 (de) 1991-02-19 1992-02-19 Lautsprech-Fernsprechgerät mit Rauschunterdrückungsschaltung
DE69233473T Expired - Fee Related DE69233473T2 (de) 1991-02-19 1992-02-19 Rauschunterdrückungsschaltung

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE69225258T Expired - Fee Related DE69225258T2 (de) 1991-02-19 1992-02-19 Lautsprech-Fernsprechgerät mit Rauschunterdrückungsschaltung

Country Status (7)

Country Link
US (1) US5459786A (de)
EP (2) EP0781029B1 (de)
JP (1) JP3076072B2 (de)
AU (1) AU655626B2 (de)
CA (1) CA2061388C (de)
DE (2) DE69225258T2 (de)
ES (1) ES2114912T3 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06216986A (ja) * 1993-01-19 1994-08-05 Mitsubishi Electric Corp ハンズフリー通話回路
JPH07297900A (ja) * 1994-04-26 1995-11-10 Mitsubishi Electric Corp 騒音対策通話機
JP2928130B2 (ja) * 1995-04-19 1999-08-03 埼玉日本電気株式会社 ハンズフリー通信装置
US5966438A (en) * 1996-03-05 1999-10-12 Ericsson Inc. Method and apparatus for adaptive volume control for a radiotelephone
US5787165A (en) * 1996-12-13 1998-07-28 Ericsson Inc. Handsfree radiotelephone having dynamic path attenuation control for echo suppression
JP3220979B2 (ja) * 1998-01-09 2001-10-22 日本電気株式会社 音声スイッチ
US7310420B2 (en) * 2004-04-28 2007-12-18 Gn Netcom A/S Telephone headset amplifier with noise blanking capability
CN101741965B (zh) * 2008-11-27 2012-10-03 博通集成电路（上海）有限公司 衰减输入信号的方法及静噪装置
JP5168162B2 (ja) * 2009-01-16 2013-03-21 沖電気工業株式会社 音信号調整装置、プログラム及び方法、並びに、電話装置
JP5228932B2 (ja) * 2009-01-16 2013-07-03 沖電気工業株式会社 音信号調整装置、プログラム及び方法、並びに、電話装置
AU2011210630A1 (en) 2010-02-01 2012-08-16 Virginia Tech Intellectual Properties, Inc. Cleaning and dewatering fine coal
US11331676B2 (en) 2010-02-01 2022-05-17 Virginia Tech Intellectual Properties, Inc. Cleaning and dewatering fine coal
US9518241B2 (en) 2010-02-01 2016-12-13 Virginia Tech Intellectual Properties, Inc. Method of separating and de-watering fine particles
US8478359B2 (en) * 2010-06-04 2013-07-02 Apple Inc. User interface tone echo cancellation
US9496841B2 (en) * 2010-10-21 2016-11-15 Nokia Technologies Oy Recording level adjustment using a distance to a sound source

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135590A (en) * 1976-07-26 1979-01-23 Gaulder Clifford F Noise suppressor system
DE2907361C2 (de) * 1979-02-24 1982-06-09 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur Störspannungsunterdrückung in Wechsel- oder Gegensprechanlagen
JPS5923668B2 (ja) * 1979-03-26 1984-06-04 沖電気工業株式会社 音声制御方式
US4600902A (en) * 1983-07-01 1986-07-15 Wegener Communications, Inc. Compandor noise reduction circuit
JPS61195055A (ja) * 1985-02-25 1986-08-29 Matsushita Electric Works Ltd 拡声電話機の音声スイツチ回路
US4715063A (en) * 1985-08-20 1987-12-22 Motorola, Inc. Speakerphone for radio and landline telephones
WO1987001546A1 (en) * 1985-09-03 1987-03-12 Motorola, Inc. Hands-free control system for a radiotelephone
EP0290952B1 (de) * 1987-05-15 1992-11-04 Alcatel SEL Aktiengesellschaft Schaltungsanordnung zur Sprachsteuerung für ein Endgerät der Nachrichtentechnik
CA1291837C (en) * 1987-07-15 1991-11-05 Juro Ohga Electronic telephone terminal having noise suppression function
US4847897A (en) * 1987-12-11 1989-07-11 American Telephone And Telegraph Company Adaptive expander for telephones
JPH01212950A (ja) * 1988-02-19 1989-08-25 Matsushita Electric Ind Co Ltd 電話装置
JPH01220509A (ja) * 1988-02-26 1989-09-04 Matsushita Electric Ind Co Ltd 信号抑圧回路

Also Published As

Publication number Publication date
US5459786A (en) 1995-10-17
EP0500356A3 (en) 1993-06-30
JPH04264860A (ja) 1992-09-21
EP0781029A3 (de) 2003-07-09
AU655626B2 (en) 1995-01-05
EP0500356B1 (de) 1998-04-29
JP3076072B2 (ja) 2000-08-14
EP0781029A2 (de) 1997-06-25
DE69225258D1 (de) 1998-06-04
CA2061388A1 (en) 1992-08-20
DE69225258T2 (de) 1998-12-03
AU1110992A (en) 1992-08-27
ES2114912T3 (es) 1998-06-16
CA2061388C (en) 1996-06-18
EP0500356A2 (de) 1992-08-26
DE69233473T2 (de) 2006-02-16
EP0781029B1 (de) 2005-01-26

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee