WO2004066668A3 - Room mode bass absorption through combined diaphragmatic & helmholtz resonance techniques - Google Patents

Room mode bass absorption through combined diaphragmatic & helmholtz resonance techniques Download PDF

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Publication number
WO2004066668A3
WO2004066668A3 PCT/US2004/001142 US2004001142W WO2004066668A3 WO 2004066668 A3 WO2004066668 A3 WO 2004066668A3 US 2004001142 W US2004001142 W US 2004001142W WO 2004066668 A3 WO2004066668 A3 WO 2004066668A3
Authority
WO
WIPO (PCT)
Prior art keywords
resonance
diaphragmatic
combined
helmholtz resonance
room mode
Prior art date
Application number
PCT/US2004/001142
Other languages
French (fr)
Other versions
WO2004066668A2 (en
Original Assignee
Performance Media Ind Ltd
Grimani Anthony
Reiley Evan
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 Performance Media Ind Ltd, Grimani Anthony, Reiley Evan filed Critical Performance Media Ind Ltd
Priority to US10/542,465 priority Critical patent/US7440580B2/en
Publication of WO2004066668A2 publication Critical patent/WO2004066668A2/en
Publication of WO2004066668A3 publication Critical patent/WO2004066668A3/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2873—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself for loudspeaker transducers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Abstract

An acoustical bass absorber which reduces peak and dip frequency response errors caused by interference from naturally occuring axial standing waves in rectangular rooms. The apparatus uses two forms of simple harmonic resonance: pistonic diaphragm resonance and Helmholtz cavity resonance. The pistonic diaphragm resonance is achieved by attaching a rigid planar membrane (16) to metal springs (18). The Helmholtz cavity resonance is achieved by constructing an enclosed chamber attached to an open cylindrical tube (24).
PCT/US2004/001142 2003-01-16 2004-01-16 Room mode bass absorption through combined diaphragmatic & helmholtz resonance techniques WO2004066668A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/542,465 US7440580B2 (en) 2003-01-16 2004-01-16 Room mode bass absorption through combined diaphragmatic and helmholtz resonance techniques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US44080303P 2003-01-16 2003-01-16
US60/440,803 2003-01-16

Publications (2)

Publication Number Publication Date
WO2004066668A2 WO2004066668A2 (en) 2004-08-05
WO2004066668A3 true WO2004066668A3 (en) 2004-12-16

Family

ID=32771865

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/001142 WO2004066668A2 (en) 2003-01-16 2004-01-16 Room mode bass absorption through combined diaphragmatic & helmholtz resonance techniques

Country Status (2)

Country Link
US (1) US7440580B2 (en)
WO (1) WO2004066668A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009007891A1 (en) * 2009-02-07 2010-08-12 Willsingh Wilson Resonance sound absorber in multilayer design
FR3047600B1 (en) * 2016-02-08 2018-02-02 Universite Paris-Sud ACOUSTIC ABSORBER, ACOUSTIC WALL AND METHOD OF DESIGN AND MANUFACTURE
EP3750326A1 (en) * 2018-02-06 2020-12-16 Artnovion, Lda Acoustical absorber for absorbing bass or sub-bass sound
CN114550685B (en) * 2022-01-25 2022-09-02 哈尔滨理工大学 Ventilating duct silencer based on folding type rough neck pipe Helmholtz resonant cavity

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1919632A (en) * 1930-04-04 1933-07-25 Rca Corp Sound radiator
US3509282A (en) * 1968-12-13 1970-04-28 William J Ashworth Sound system
US6058196A (en) * 1990-08-04 2000-05-02 The Secretary Of State For Defense In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Panel-form loudspeaker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6778673B1 (en) * 1998-10-28 2004-08-17 Maximilian Hans Hobelsberger Tunable active sound absorbers
US6782109B2 (en) * 2000-04-04 2004-08-24 University Of Florida Electromechanical acoustic liner
GR1004186B (en) * 2002-05-21 2003-03-12 Wide spectrum sound scattering device with controlled absorption of low frequencies and methods of installation thereof
US7206425B2 (en) * 2003-01-23 2007-04-17 Adaptive Technologies, Inc. Actuator for an active noise control system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1919632A (en) * 1930-04-04 1933-07-25 Rca Corp Sound radiator
US3509282A (en) * 1968-12-13 1970-04-28 William J Ashworth Sound system
US6058196A (en) * 1990-08-04 2000-05-02 The Secretary Of State For Defense In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Panel-form loudspeaker

Also Published As

Publication number Publication date
WO2004066668A2 (en) 2004-08-05
US7440580B2 (en) 2008-10-21
US20060147077A1 (en) 2006-07-06

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