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WO2003026344A3 - Acoustic device - Google Patents

Acoustic device Download PDF

Info

Publication number
WO2003026344A3
WO2003026344A3 PCT/GB2002/003778 GB0203778W WO03026344A3 WO 2003026344 A3 WO2003026344 A3 WO 2003026344A3 GB 0203778 W GB0203778 W GB 0203778W WO 03026344 A3 WO03026344 A3 WO 03026344A3
Authority
WO
WIPO (PCT)
Prior art keywords
modal resonance
panel
distribution
resonance frequency
identifying
Prior art date
Application number
PCT/GB2002/003778
Other languages
French (fr)
Other versions
WO2003026344A2 (en
Inventor
Neil Harris
Henry Azima
Original Assignee
New Transducers Ltd
Neil Harris
Henry Azima
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 New Transducers Ltd, Neil Harris, Henry Azima filed Critical New Transducers Ltd
Priority to US10/450,030 priority Critical patent/US7062051B2/en
Priority to AU2002321477A priority patent/AU2002321477A1/en
Priority to JP2003529805A priority patent/JP4061267B2/en
Priority to EP02755181A priority patent/EP1425937B1/en
Publication of WO2003026344A2 publication Critical patent/WO2003026344A2/en
Publication of WO2003026344A3 publication Critical patent/WO2003026344A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

A method of improving the modal resonance frequency distribution of a panel (2) for a distribution resonant mode bending wave acoustic device involves analysing the distribution of the modal resonance frequencies of the panel, identifying a modal resonance frequency that is non-uniformly spaced relative to adjacent modal resonance frequencies, identifying a location on said panel that exhibits anti-nodal behaviour at said modal resonance frequency and changing the local impedance to bending wave vibration at said location (6). The method has particular application to distributed mode loudspeakers (1).
PCT/GB2002/003778 2001-08-17 2002-08-15 Acoustic device WO2003026344A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US10/450,030 US7062051B2 (en) 2001-08-17 2002-08-15 Acoustic device
AU2002321477A AU2002321477A1 (en) 2001-08-17 2002-08-15 Acoustic device
JP2003529805A JP4061267B2 (en) 2001-08-17 2002-08-15 Sound equipment
EP02755181A EP1425937B1 (en) 2001-08-17 2002-08-15 Method of improving the modal resonance frequency distribution of a panel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0120130.0 2001-08-17
GB0120130A GB0120130D0 (en) 2001-08-17 2001-08-17 Loudspeaker

Publications (2)

Publication Number Publication Date
WO2003026344A2 WO2003026344A2 (en) 2003-03-27
WO2003026344A3 true WO2003026344A3 (en) 2003-10-30

Family

ID=9920605

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/003778 WO2003026344A2 (en) 2001-08-17 2002-08-15 Acoustic device

Country Status (7)

Country Link
EP (1) EP1425937B1 (en)
JP (1) JP4061267B2 (en)
CN (1) CN100397952C (en)
AU (1) AU2002321477A1 (en)
GB (1) GB0120130D0 (en)
TW (1) TW577238B (en)
WO (1) WO2003026344A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20051106A1 (en) * 2005-06-13 2006-12-14 Enrico Ciresa S R L SOUND PANEL FOR THE DIFFUSION OF SOUNDS AND MUSIC AND ITS PROCESS OF MANUFACTURING.
GB0601076D0 (en) * 2006-01-19 2006-03-01 New Transducers Ltd Acoustic device and method of making acoustic device
JP7508451B2 (en) * 2018-10-13 2024-07-01 ユニヴァーシティ オヴ ロチェスター Method, system and device for selective modal control for vibrating a structure - Patents.com

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997009842A2 (en) * 1995-09-02 1997-03-13 New Transducers Limited Acoustic device
WO1999002012A1 (en) * 1997-07-03 1999-01-14 New Transducers Limited Panel-form loudspeakers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997009842A2 (en) * 1995-09-02 1997-03-13 New Transducers Limited Acoustic device
WO1999002012A1 (en) * 1997-07-03 1999-01-14 New Transducers Limited Panel-form loudspeakers

Also Published As

Publication number Publication date
EP1425937A2 (en) 2004-06-09
WO2003026344A2 (en) 2003-03-27
TW577238B (en) 2004-02-21
CN100397952C (en) 2008-06-25
CN1526259A (en) 2004-09-01
JP2005503741A (en) 2005-02-03
GB0120130D0 (en) 2001-10-10
JP4061267B2 (en) 2008-03-12
EP1425937B1 (en) 2012-02-22
AU2002321477A1 (en) 2003-04-01

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