EP0580579B1 - Dispositif de suppression de bruit - Google Patents

Dispositif de suppression de bruit Download PDF

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Publication number
EP0580579B1
EP0580579B1 EP91920600A EP91920600A EP0580579B1 EP 0580579 B1 EP0580579 B1 EP 0580579B1 EP 91920600 A EP91920600 A EP 91920600A EP 91920600 A EP91920600 A EP 91920600A EP 0580579 B1 EP0580579 B1 EP 0580579B1
Authority
EP
European Patent Office
Prior art keywords
duct
enclosure
transmission line
chamber
noise
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 - Lifetime
Application number
EP91920600A
Other languages
German (de)
English (en)
Other versions
EP0580579A4 (en
EP0580579A1 (fr
Inventor
Khosrow Eghtesadi
William John Joseph Hoge
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.)
Noise Cancellation Technologies Inc
Original Assignee
Noise Cancellation Technologies Inc
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 Noise Cancellation Technologies Inc filed Critical Noise Cancellation Technologies Inc
Priority to AT91920600T priority Critical patent/ATE167775T1/de
Publication of EP0580579A1 publication Critical patent/EP0580579A1/fr
Publication of EP0580579A4 publication Critical patent/EP0580579A4/en
Application granted granted Critical
Publication of EP0580579B1 publication Critical patent/EP0580579B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2842—Enclosures comprising vibrating or resonating arrangements of the bandpass type for loudspeaker transducers
    • 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 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns

Definitions

  • This invention relates to noise control apparatus.
  • the simplest form of a loudspeaker system is the direct radiator.
  • a loudspeaker radiates sound directly from the enclosure aperture(s)--the driver diaphragm and, in the case of vented-box systems, a vent or port. There are no additional devices through which the sound passes.
  • a transmission line loudspeaker adds an additional device, such as a horn for impedance matching, through which some or all of the sound passes.
  • Prior forms of transmission line systems may be divided into three classes.
  • a type A transmission line system consists of a closed-box direct radiator loudspeaker with a transmission line added to the driver aperture. All radiated sound passes through the transmission line.
  • a Type B or C system consists of a direct radiator system with the transmission line coupled to the back chamber of the enclosure. Both the Type B or Type C form exhibit the fault that the transmission line presents an acoustical short circuit to the back of the driver at least at some frequencies. This can cause serious dips in the system response.
  • US-A-4665549 discloses acoustic attenuation apparatus for a duct which guides an acoustic wave.
  • a silencer is provided for passively attenuating the acoustic wave in the duct, and a cancelling speaker is provided within the silencer.
  • the combination provides hybrid active/passive combined attenuation.
  • Various rectangular and circular structures are disclosed, together with multi-path and multi-speaker arrangements.
  • US-A-4875546 discloses a loudspeaker for a hi-fi audio system having means for acoustically impeding excursion of the transducer diaphragm and means for acoustically attenuating the output of acoustic vibrations of frequencies above a preselected frequency.
  • the loudspeaker includes first and second subchambers separated by a dividing wall in which the transducer is mounted.
  • a first port acoustically couples the first subchamber with the second subchamber and a second port acoustically couples the second subchamber with the outside environment surrounding the loudspeaker.
  • the improved performance is roughly analogous to that seen in a vented-box direct radiator system as compared to a closed-box system. Either the efficiency or the bandwidth may be increased; or the system size may be decreased; or a tradeoff may be made among these possible benefits.
  • the present invention provides noise control apparatus according to Claim 1.
  • Noise control apparatus according to the pre-characterising portion of Claim 1 is known from the abstract of JP-A-2072395.
  • the transmission characteristics of the system using a horn will be determined in great measure by the horn and the acoustic load it presents to the front chamber, but will, in general, be high-pass in nature.
  • the transmission characteristics of the short tube system will be band-pass in nature.
  • the driver and the vented-box portion of the enclosure will provide a 4-pole high-pass response, and the front chamber and the outlet tube will provide a 2-pole low-pass response.
  • a preferred arrangement of the apparatus is particularly useful for active noise cancellation applications such as exhaust mufflers or duct silencers.
  • the pipe or duct through which the noisy signal is flowing passes through the enclosure and exits through the outlet tube.
  • the end of the noisy pipe or duct is aligned with the end of the loudspeaker and the two are coaxial.
  • the antinoise signal radiated by the loudspeaker during the active cancellation is coaxial with the noise.
  • Very good cancellation may be obtained at frequencies with wavelengths which are long compared to the size of the outlet.
  • FIG. 2 shows an electrodynamic loudspeaker driver 1 mounted in an enclosure 2 so that one side of the driver diaphragm radiates sound into the front chamber of the enclosure 3.
  • the sound from the other side of the driver passes through the acoustic phase inverter comprising the back chamber 4 and the inner vent 5 which connects the front and back chambers.
  • the total system output consists of the sum of the front wave and the phase corrected back wave flowing through the front chamber and out via the transmission line 6.
  • FIG. 1 shows the basic signal flow graph of the system using an electrodynamic driver 1.
  • Electric potential E g is applied accross the driver voice coil which has a resistance R E and a resulting current I VC flows.
  • the electrodynamic coupling B1 of the motor causes a driving force.
  • the sum of this force and the various reaction forces in the system gives the total force driving the diaphragm F D .
  • This force accelerates the diaphragm at a rate inversely proportional to the moving mass M MS of the driver.
  • the resulting acceleration of the diaphragm a D is integrated once with respect to time (the 1/s operation in the LaPlace domain) to find the velocity of the diaphragm u D and a second time to find the displacement of the diaphragm x D .
  • moving the diaphragm results in some reaction forces.
  • an opposing force inversely proportional to the mechanical compliance C MS of the driver is added to the total force F D .
  • Another opposing force results from the motion through the mechanical losses R MS of the system and is equal to the product of R MS and u D .
  • This volume velocity U D is equal to the product of the diaphragam velocity u D and its effective area S D .
  • This volume velocity is one of the components of the total flow into the front chamber U F .
  • the conservation of matter requires that the flow into the back chamber U B across the boundary between it and the front chamber be equal to U F but opposite in polarity.
  • the volume velocity U B pressurizes the back chamber 4 .
  • the acoustic pressure of the back chamber p B is equal to the integral of U B with respect to time divided by the acoustic compliance to the back chamber C AB . This pressure exerts another reaction force against the back of the diaphragm which is equal to the pressure p B times the diaphragm area S D . This is another component of F D .
  • the analysis of the system is similar, except that the line impedance is simplified because the short tube presents a lumped parameter element.
  • the output flow U O is equal to the front chamber pressure p F integrated with respect to time and divided by the acoustic mass of the outlet vent M AF .
  • the opposing pressure component of p F results from the flow losses in the outlet R AF .
  • FIGS. 5 to 8 show views of a practical loudspeaker system using the present invention which has particular application in active noise control systems.
  • a flow tube 7 containing for the noisy flow such as the exhaust of an engine
  • a drain tube 8 has been added between the front and back chamber so that water or other liquids trapped in the back chamber may escape. If the loudspeaker were used in an active noise cancellation system on a vehicle and if the vehicle were driven through deep water, the muffler could be flooded. The drain tube would allow the trapped water to flow out of the back chamber.
  • the drain tube must be sized so that it acts as an acoustic mass rather than an acoustic leak between the chambers. Its mass must either be considered when adjusting the enclosure tuning or be trivial compared to the inner vent 5 so that the effect of the drain may be ignored.
  • FIG. 9 shows an apparatus using the present invention which also has particular application for active noise control.
  • the- short tube 6 is formed by the area between the heat shield plate 17 and the connection to the noisy duct 7 .
  • a long, narrow tube 9 allows outside air to enter the enclosure.
  • This tube like the drain tube discussed above, should be sized so that it has no adverse effect on the system acoustic performance. It may enter the enclosure through either the front or back chamber. Air is forced through the system because of the venturi-like detail 10 in the noisy duct. The flow through the duct over the "venturi” causes a low pressure region which "draws" the outside air. This air may be useful for cooling or removal of corrosive gases.
  • FIG. 10 there is shown the general form of the Vented Box Bandpass Loudspeaker (VBBP) configuration.
  • Fig. 11 shows the simplified acoustical analogous circuit of the Vented Box Bandpass Loudspeaker (VBBP) configuration.
  • P g (S 3 C AS M AB C AB ) ⁇ S 6 M AS C AS M AP C
  • P o (S) sM AP U o

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Exhaust Silencers (AREA)

Claims (8)

  1. Dispositif de suppression de bruit comprenant :
    une enceinte (2) ;
    au moins un moyen d'excitation de haut-parleur (1) monté dans l'enceinte (2) ; et
    un conduit (7), l'enceinte étant agencée de manière à engendrer un anti-bruit pour le bruit dans le conduit (7) ;
    caractérisé en ce que :
    l'enceinte comprend une chambre avant (3) et une chambre arrière (4) connectées par un conduit (5) ;
    le moyen d'excitation de haut-parleur est prévu pour produire une onde avant et une onde arrière de sorte que, à une fréquence désirée, l'onde arrière est. ajoutée par construction à l'onde avant dans la chambre avant (3) ; et
    il est prévu une ligne de transmission (6) fixée à ladite chambre avant (3) et acoustiquement couplée au conduit (7), ladite ligne de transmission (6 ) comportant la seule sortie d'anti-bruit de l'enceinte vers le conduit (7).
  2. Dispositif selon la revendication 1, dans lequel la ligne de transmission est un pavillon.
  3. Dispositif selon la revendication 1, dans lequel la ligne de transmission est un tube court.
  4. Dispositif selon la revendication 1, 2 ou.3, dans lequel le conduit (7) traverse l'enceinte (2) et sort à travers la ligne de transmission (6) pour la fonction de suppression du bruit.
  5. Dispositif selon une quelconque des revendications précédentes, dans lequel une purge (8) est prévue entre la chambre avant et la chambre arrière pour permettre aux liquides emprisonnés de s'évacuer de la chambre arrière, la purge étant de préférence sous la forme d'un trou ou d'un tube.
  6. Dispositif selon la revendication 3, ou la revendication 4 ou 5 lorsqu'elle dépend de la revendication 3, dans lequel le tube court (6) est formé par la région entre une plaque placée dans la chambre avant et la connexion au conduit.
  7. Dispositif selon une quelconque des revendications précédentes, dans lequel un tube de ventilation (9) est connecté entre la chambre avant ou arrière et l'air-extérieur, et une structure de type venturi est prévue dans le conduit afin de créer une région.de basse pression pour aspirer l'air extérieur à travers le système.
  8. Dispositif selon une quelconque des revendications précédentes, dans lequel ledit conduit (5) comprend un trou faisant communiquer lesdites chambres avant et arrière.
EP91920600A 1991-04-19 1991-04-19 Dispositif de suppression de bruit Expired - Lifetime EP0580579B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91920600T ATE167775T1 (de) 1991-04-19 1991-04-19 Vorrichtung zur geräuschunterdrückung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002108696A CA2108696A1 (fr) 1991-04-19 1991-04-19 Ameliorations pour enceintes acoustiques a labyrinthe
PCT/US1991/002731 WO1992019080A1 (fr) 1991-04-19 1991-04-19 Perfectionnements apportes aux haut-parleurs a ligne de transmission

Publications (3)

Publication Number Publication Date
EP0580579A1 EP0580579A1 (fr) 1994-02-02
EP0580579A4 EP0580579A4 (en) 1994-06-15
EP0580579B1 true EP0580579B1 (fr) 1998-06-24

Family

ID=25676762

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91920600A Expired - Lifetime EP0580579B1 (fr) 1991-04-19 1991-04-19 Dispositif de suppression de bruit

Country Status (8)

Country Link
EP (1) EP0580579B1 (fr)
JP (1) JPH06508445A (fr)
CA (1) CA2108696A1 (fr)
DE (1) DE69129664T2 (fr)
DK (1) DK0580579T3 (fr)
ES (1) ES2118093T3 (fr)
HK (1) HK1011163A1 (fr)
WO (1) WO1992019080A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9564146B2 (en) 2014-08-01 2017-02-07 Bongiovi Acoustics Llc System and method for digital signal processing in deep diving environment
US9998832B2 (en) 2015-11-16 2018-06-12 Bongiovi Acoustics Llc Surface acoustic transducer
US10069471B2 (en) 2006-02-07 2018-09-04 Bongiovi Acoustics Llc System and method for digital signal processing
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
US10313791B2 (en) 2013-10-22 2019-06-04 Bongiovi Acoustics Llc System and method for digital signal processing

Families Citing this family (21)

* Cited by examiner, † Cited by third party
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JP3290991B2 (ja) * 1994-05-10 2002-06-10 ノイズ キャンセレーション テクノロジーズ インコーポレーテッド 能動騒音消去マフラ
US6504938B1 (en) * 2000-10-06 2003-01-07 Logitech Europe S.A. Dual-chamber loudspeaker
US8284955B2 (en) 2006-02-07 2012-10-09 Bongiovi Acoustics Llc System and method for digital signal processing
US10848118B2 (en) 2004-08-10 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
US11431312B2 (en) 2004-08-10 2022-08-30 Bongiovi Acoustics Llc System and method for digital signal processing
US11202161B2 (en) 2006-02-07 2021-12-14 Bongiovi Acoustics Llc System, method, and apparatus for generating and digitally processing a head related audio transfer function
US10701505B2 (en) 2006-02-07 2020-06-30 Bongiovi Acoustics Llc. System, method, and apparatus for generating and digitally processing a head related audio transfer function
US10848867B2 (en) 2006-02-07 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
PL1994793T3 (pl) * 2006-03-15 2015-04-30 Thomas J Danley Odtwarzanie dźwięku z poprawionymi charakterystykami niskiej częstotliwości
DE102011084567C5 (de) * 2011-10-14 2019-08-14 Eberspächer Exhaust Technology GmbH & Co. KG Aktiver Schalldämpfer
US9264004B2 (en) 2013-06-12 2016-02-16 Bongiovi Acoustics Llc System and method for narrow bandwidth digital signal processing
US9883318B2 (en) 2013-06-12 2018-01-30 Bongiovi Acoustics Llc System and method for stereo field enhancement in two-channel audio systems
US10639000B2 (en) 2014-04-16 2020-05-05 Bongiovi Acoustics Llc Device for wide-band auscultation
US9615813B2 (en) 2014-04-16 2017-04-11 Bongiovi Acoustics Llc. Device for wide-band auscultation
US10820883B2 (en) 2014-04-16 2020-11-03 Bongiovi Acoustics Llc Noise reduction assembly for auscultation of a body
US9479861B2 (en) * 2014-06-26 2016-10-25 Anthony Allen BISSET Compact wideband bass and midrange horn-loaded speaker system
US9638672B2 (en) 2015-03-06 2017-05-02 Bongiovi Acoustics Llc System and method for acquiring acoustic information from a resonating body
US9906867B2 (en) 2015-11-16 2018-02-27 Bongiovi Acoustics Llc Surface acoustic transducer
KR20200143707A (ko) 2018-04-11 2020-12-24 본지오비 어커스틱스 엘엘씨 오디오 향상 청력 보호 시스템
US10959035B2 (en) 2018-08-02 2021-03-23 Bongiovi Acoustics Llc System, method, and apparatus for generating and digitally processing a head related audio transfer function
CN113504663B (zh) * 2021-07-23 2023-04-25 歌尔科技有限公司 发声模组、发声模组的消声方法和智能眼镜

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JPS5789393A (en) * 1980-11-17 1982-06-03 Bose Corp Controller for low end response for loudspeaker system
US4473906A (en) * 1980-12-05 1984-09-25 Lord Corporation Active acoustic attenuator
US4549631A (en) * 1983-10-24 1985-10-29 Bose Corporation Multiple porting loudspeaker systems
US4616731A (en) * 1984-03-02 1986-10-14 Robinson James R Speaker system
US4665549A (en) * 1985-12-18 1987-05-12 Nelson Industries Inc. Hybrid active silencer
US4875546A (en) * 1988-06-02 1989-10-24 Teledyne Industries, Inc. Loudspeaker with acoustic band-pass filter
JPH0787628B2 (ja) * 1989-02-22 1995-09-20 株式会社ケンウッド 低音再生用スピーカシステム
US5025885A (en) * 1989-07-14 1991-06-25 Bose Corporation Multiple chamber loudspeaker system
JP4862491B2 (ja) * 2005-05-25 2012-01-25 東レ株式会社 植毛用パイルおよび植毛製品

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
US10069471B2 (en) 2006-02-07 2018-09-04 Bongiovi Acoustics Llc System and method for digital signal processing
US10313791B2 (en) 2013-10-22 2019-06-04 Bongiovi Acoustics Llc System and method for digital signal processing
US9564146B2 (en) 2014-08-01 2017-02-07 Bongiovi Acoustics Llc System and method for digital signal processing in deep diving environment
US9998832B2 (en) 2015-11-16 2018-06-12 Bongiovi Acoustics Llc Surface acoustic transducer

Also Published As

Publication number Publication date
JPH06508445A (ja) 1994-09-22
HK1011163A1 (en) 1999-07-02
DK0580579T3 (da) 1999-04-06
CA2108696A1 (fr) 1992-10-20
EP0580579A4 (en) 1994-06-15
WO1992019080A1 (fr) 1992-10-29
EP0580579A1 (fr) 1994-02-02
DE69129664T2 (de) 1998-12-03
ES2118093T3 (es) 1998-09-16
DE69129664D1 (de) 1998-07-30

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