DE69425421D1 - Verstärkervorrichtung - Google Patents

Verstärkervorrichtung

Info

Publication number
DE69425421D1
DE69425421D1 DE69425421T DE69425421T DE69425421D1 DE 69425421 D1 DE69425421 D1 DE 69425421D1 DE 69425421 T DE69425421 T DE 69425421T DE 69425421 T DE69425421 T DE 69425421T DE 69425421 D1 DE69425421 D1 DE 69425421D1
Authority
DE
Germany
Prior art keywords
amplifier device
amplifier
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
DE69425421T
Other languages
English (en)
Other versions
DE69425421T2 (de
Inventor
Masaharu Ikeda
Ryoji Abe
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of DE69425421D1 publication Critical patent/DE69425421D1/de
Application granted granted Critical
Publication of DE69425421T2 publication Critical patent/DE69425421T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H03F3/185—Low frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only with field-effect devices
    • H03F3/1855—Low frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only with field-effect devices with junction-FET devices
DE69425421T 1994-01-21 1994-09-16 Verstärkervorrichtung Expired - Fee Related DE69425421T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP00521894A JP3437237B2 (ja) 1994-01-21 1994-01-21 増幅装置

Publications (2)

Publication Number Publication Date
DE69425421D1 true DE69425421D1 (de) 2000-09-07
DE69425421T2 DE69425421T2 (de) 2001-03-15

Family

ID=11605063

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69425421T Expired - Fee Related DE69425421T2 (de) 1994-01-21 1994-09-16 Verstärkervorrichtung

Country Status (4)

Country Link
US (1) US5579397A (de)
EP (1) EP0664605B1 (de)
JP (1) JP3437237B2 (de)
DE (1) DE69425421T2 (de)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW437161B (en) * 1995-08-30 2001-05-28 Sony Corp Audio signal amplifying apparatus
US6067363A (en) * 1996-06-03 2000-05-23 Ericsson Inc. Audio A/D convertor using frequency modulation
US6201537B1 (en) * 1996-06-11 2001-03-13 Samsung Electronics Co., Ltd. Sound control circuit and method using microcomputer
US6266424B1 (en) * 1996-11-13 2001-07-24 Vxi Corporation Electret microphone circuit with low battery disable
AUPO862197A0 (en) * 1997-08-15 1997-09-11 Leisuretech Electronics Pty Ltd A distributed stereo system
US6389139B1 (en) 1997-11-18 2002-05-14 Dana Innovations Powered volume control for distributed audio system
US20030035556A1 (en) * 1997-11-18 2003-02-20 Jerry Curtis Audio distribution system
US6504937B1 (en) * 1998-01-06 2003-01-07 Vxi Corporation Amplifier circuit for electret microphone with enhanced performance
JP4227679B2 (ja) * 1998-05-07 2009-02-18 株式会社オーディオテクニカ インピーダンス変換器
US6580797B1 (en) 1998-07-15 2003-06-17 Vxi Corporation Amplifier circuit for electret microphone with enhanced performance
EP1067819B1 (de) * 1999-07-08 2004-06-09 Matsushita Electric Industrial Co., Ltd. Kondensator-mikrofongerät und Verbindungsvorrichtung
JP4129108B2 (ja) * 2000-02-25 2008-08-06 三菱電機株式会社 マイクロフォン用フィルタおよびマイクロフォン装置
US6975258B2 (en) * 2003-01-23 2005-12-13 Corporation For National Research Initiatives Circuit for direct digital delta-sigma conversion of variable electrical capacitance
EP1397022A1 (de) * 2003-03-11 2004-03-10 Phonak Ag Mikrofonvorrichtungen
US20050213787A1 (en) * 2004-03-26 2005-09-29 Knowles Electronics, Llc Microphone assembly with preamplifier and manufacturing method thereof
US7356151B2 (en) * 2004-03-30 2008-04-08 Akg Acoustic Gmbh Microphone system
JP4310234B2 (ja) * 2004-05-18 2009-08-05 株式会社オーディオテクニカ コンデンサマイクロホン
JP2006033091A (ja) * 2004-07-12 2006-02-02 Jepico Corp センサユニット及びセンサ信号処理回路
US7179985B2 (en) * 2005-04-13 2007-02-20 Kieffa Drums, Llc Hybrid electric/acoustic percussion instrument
JP4741356B2 (ja) * 2005-12-02 2011-08-03 新日本無線株式会社 マイク増幅器
JP5067838B2 (ja) * 2007-01-31 2012-11-07 株式会社オーディオテクニカ マイクロホンの電源装置
CN101796117A (zh) * 2007-04-12 2010-08-04 加利福尼亚大学董事会 用于无线通信和无线电传输的碳纳米管
DE102007036580A1 (de) * 2007-08-02 2009-02-05 Endress + Hauser Flowtec Ag Feldbuseinheit für einen Zwei-Leiter-Feldbus
JP5341813B2 (ja) * 2009-11-04 2013-11-13 明彦 金田 マイクロホンアンプ及びマイクロホンシステム
JP6257262B2 (ja) * 2013-10-21 2018-01-10 株式会社オーディオテクニカ コンデンサマイクロホン
US9357295B2 (en) 2013-10-22 2016-05-31 Infineon Technologies Ag System and method for a transducer interface
US9402131B2 (en) * 2013-10-30 2016-07-26 Knowles Electronics, Llc Push-pull microphone buffer
CN106658255A (zh) * 2016-10-21 2017-05-10 声源科技（深圳）有限公司 一种降噪耳机的滤波器电路

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512100A (en) * 1968-07-03 1970-05-12 Intern Research Products Inc Audio frequency amplification circuit
JPS5710598A (en) * 1980-06-20 1982-01-20 Sony Corp Transmitting circuit of microphone output
DE3134888A1 (de) * 1981-09-03 1983-03-10 Robert Bosch Gmbh, 7000 Stuttgart "hoergeraet"
GB2161044B (en) * 1984-06-28 1988-01-27 Stc Plc Telephone subscribers circuits
JPH0612856B2 (ja) * 1985-09-30 1994-02-16 株式会社東芝 増幅回路
JPH0728468B2 (ja) * 1986-12-04 1995-03-29 松下電器産業株式会社 静電型マイクロホン用インピ−ダンス変換器

Also Published As

Publication number Publication date
JPH07212148A (ja) 1995-08-11
JP3437237B2 (ja) 2003-08-18
DE69425421T2 (de) 2001-03-15
EP0664605A1 (de) 1995-07-26
EP0664605B1 (de) 2000-08-02
US5579397A (en) 1996-11-26

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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