CA2021244A1 - Noise reducing device - Google Patents

Noise reducing device

Info

Publication number
CA2021244A1
CA2021244A1 CA 2021244 CA2021244A CA2021244A1 CA 2021244 A1 CA2021244 A1 CA 2021244A1 CA 2021244 CA2021244 CA 2021244 CA 2021244 A CA2021244 A CA 2021244A CA 2021244 A1 CA2021244 A1 CA 2021244A1
Authority
CA
Canada
Prior art keywords
noise
unit
wave
delaying
frequency
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
CA 2021244
Other languages
French (fr)
Other versions
CA2021244C (en
Inventor
Masaaki Nagami
Akira Motojima
Yoshihiro Kageyama
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.)
Denso Ten Ltd
Original Assignee
Denso Ten 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 Denso Ten Ltd filed Critical Denso Ten Ltd
Publication of CA2021244A1 publication Critical patent/CA2021244A1/en
Application granted granted Critical
Publication of CA2021244C publication Critical patent/CA2021244C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Exhaust Silencers (AREA)

Abstract

A noise reducing device including a noise silencing device having a delay unit for delaying a phase of the noise wave, an amplifying unit for adjusting a gain of the delayed noise wave, a superposing unit for superposing the delayed noise wave as the noise silencing wave, a frequency selecting unit for selecting at least one frequency with respect to the noise wave, a factor selecting unit for selecting at least one of a delaying factor used for the delaying unit and a gain factor used for the amplifying unit with respect to the selected frequency, and a controlling unit for controlling at least one of the delaying unit and amplifying unit utilizing the selected delaying factor and a gain factor, respectively, whereby a noise silencing wave having the same frequency and amplitude as that of a noise to reduced but having a reverse phase can be easily obtained, and thus efficient noise reduction can be obtained despite variation of the frequency of the noise.
CA002021244A 1989-07-19 1990-07-16 Noise reducing device Expired - Lifetime CA2021244C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1184740A JPH0727391B2 (en) 1989-07-19 1989-07-19 Noise reduction device
JP1-184740 1989-07-19

Publications (2)

Publication Number Publication Date
CA2021244A1 true CA2021244A1 (en) 1991-01-20
CA2021244C CA2021244C (en) 1999-05-04

Family

ID=16158529

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002021244A Expired - Lifetime CA2021244C (en) 1989-07-19 1990-07-16 Noise reducing device

Country Status (2)

Country Link
JP (1) JPH0727391B2 (en)
CA (1) CA2021244C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114576661A (en) * 2020-11-30 2022-06-03 广东美的白色家电技术创新中心有限公司 Smoke machine

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69227252T2 (en) * 1991-05-30 1999-03-25 Fujitsu Ten Ltd NOISE MONITORING DEVICE
JP3517892B2 (en) * 1993-03-24 2004-04-12 マツダ株式会社 Vehicle vibration reduction device
JP2001056693A (en) 1999-08-20 2001-02-27 Matsushita Electric Ind Co Ltd Noise reduction device
CN101326855A (en) * 2005-12-05 2008-12-17 学校法人千叶工业大学 Acoustical signal processing equipment, acoustical signal processing method, acoustics reproducing system, method for designing acoustical signal processing equipment
JP4802808B2 (en) * 2006-03-28 2011-10-26 パナソニック電工株式会社 Telephone device
JP4921954B2 (en) * 2006-12-25 2012-04-25 株式会社竹中工務店 Noise reduction device
WO2009037733A1 (en) 2007-09-21 2009-03-26 Fujitsu Limited Active silencer and method of controlling active silencer
JP5728378B2 (en) * 2011-12-26 2015-06-03 株式会社竹中工務店 Noise reduction device
CN102928073A (en) * 2012-11-26 2013-02-13 昆山北极光电子科技有限公司 Phase-congruency-based vibration noise filtering method
JP6377412B2 (en) * 2014-05-26 2018-08-22 株式会社奥村組 Active noise control system and active noise control method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58156997A (en) * 1982-03-13 1983-09-19 永積　靖夫 Active type silencer
JPS6256995A (en) * 1985-09-05 1987-03-12 株式会社日本自動車部品総合研究所 Active silencer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114576661A (en) * 2020-11-30 2022-06-03 广东美的白色家电技术创新中心有限公司 Smoke machine

Also Published As

Publication number Publication date
JPH0350998A (en) 1991-03-05
CA2021244C (en) 1999-05-04
JPH0727391B2 (en) 1995-03-29

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKEC Expiry (correction)
MKEC Expiry (correction)

Effective date: 20121202