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WO1994029845A1 - Haut-parleur monte en hauteur pour la suppression active du bruit - Google Patents

Haut-parleur monte en hauteur pour la suppression active du bruit Download PDF

Info

Publication number
WO1994029845A1
WO1994029845A1 PCT/US1994/004194 US9404194W WO9429845A1 WO 1994029845 A1 WO1994029845 A1 WO 1994029845A1 US 9404194 W US9404194 W US 9404194W WO 9429845 A1 WO9429845 A1 WO 9429845A1
Authority
WO
WIPO (PCT)
Prior art keywords
enclosure
active noise
sound
noise cancellation
workplace
Prior art date
Application number
PCT/US1994/004194
Other languages
English (en)
Inventor
Sen M. Kuo
Mary K. Christensen
Robert A. Herold
Original Assignee
Caterpillar 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 Caterpillar Inc. filed Critical Caterpillar Inc.
Priority to AU66664/94A priority Critical patent/AU6666494A/en
Publication of WO1994029845A1 publication Critical patent/WO1994029845A1/fr

Links

Classifications

    • 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
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
    • 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
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/103—Three dimensional
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G10K2210/12821—Rolling noise; Wind and body noise
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3039—Nonlinear, e.g. clipping, numerical truncation, thresholding or variable input and output gain
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/50—Miscellaneous
    • G10K2210/509—Hybrid, i.e. combining different technologies, e.g. passive and active

Definitions

  • the invention relates to the control of the sound level in a vehicle operator station and in particular to the positioning of the cancelling speaker in an active noise cancellation zone.
  • Active noise cancellation involves superimposing on a noise acoustic wave an opposite acoustic wave that destructively interferes with and cancels the noise wave.
  • the cancelling acoustic wave is of equal amplitude but of opposite phase to the noise acoustic wave.
  • the generation of the proper interference signal to produce cancellation in the proper position at the right time requires taking into consideration a number of variables resulting in elaborate signal processing.
  • the active noise cancellation principle is most useful at frequencies below 500 cycles per second (Hz) . Above that frequency range noise attenuating materials applied to surfaces are more effective.
  • the implementation of the principle of active noise cancellation generally involves sensing of the characteristics of the noise acoustic wave, generating the cancelling acoustic wave and through monitoring the combined waves, developing a feedback signal that keeps the cancelling wave in adjustment.
  • the monitoring signal is frequently called an "error" signal.
  • Active noise cancellation systems exhibit instability under conditions where the cancelling signal gets into the noise prior to the sensing of the characteristics of that noise. Care in constructing a system is employed to prevent the situation or a modification of the algorithm can be used to accommodate it.
  • noise associated with a vehicle such as engine, fan, hydraulic, gear drive as well as noise produced from motion of the vehicle, the sources of all of which are close to the operator station.
  • the material out of which the vehicle is made is usually a good transmitter of vibration.
  • the invention provides a large and focusable, localized reduced sound zone, in the workplace of an operator in a vehicle.
  • the zone can be focused about the head and shoulders of an operator as well as on a working surface.
  • the invention involves the placing of one or several active noise cancellation speakers in the top portion of an operator enclosure in a vehicle.
  • the invention provides a cancelling speaker mounting position that improves the focus and intensity of the cancelling signal, provides a larger reduced sound zone and simplifies the processing of the signals.
  • Fig. 1 is a perspective view of the mounting of active noise cancellation speakers at the top of an operator enclosure of a vehicle.
  • the invention involves the placing of the speaker or speakers used in active noise cancellation in the workplace of an operator in an enclosure of a vehicle, in the top of the enclosure.
  • the positioning of the speaker or speakers in the top of the enclosure improves the focus and extent of a zone with a reduced sound level formed in the workplace of an operator by active noise cancellation.
  • the positioning of the sound cancellation signal transducer or speaker in the top of the operator enclosure further increases the intensity and extent of the zone of reduced sound level. Where the cancelling speaker or speakers is directly above the workplace, there is permitted an extension of the reduced sound zone throughout more of the volume of the enclosure giving the operator more space to move and places to work.
  • FIG. 1 a perspective view is shown of the mounting of the sound cancellation speaker or speakers in the top of the enclosure.
  • FIG. 1 an example utility vehicle enclosure 1 is shown in which the sound cancellation speaker 2 is mounted in the top 3.
  • the mounting in the top surface provides greater headroom clearance for the operator and the ability to position speakers in several other locations to be used individually, in pairs or in other multiples.
  • Example locations for other speakers are shown dotted in the top surface of the enclosure 1.
  • the enclosure 1 has a layer of passive sound attenuating material 4 on essentially all inside surfaces.
  • the enclosure 1 surrounds a volume of space. In that space an operator can sit such as in the seat 5, stand and or work at the surface 6.
  • a portion of one wall of the enclosure may have visual properties such as a glass windshield 7 that has high sound reflecting properties but on which the passive attenuating material 4, being opaque, cannot be used.
  • the passive sound attenuating material has low efficiency at the low 80 to 500 Hz frequencies and the material of which vehicles are made is a good transmitter of vibration from the many noise sources.
  • the background sound conditions inside the enclosure are very high and often detrimental to workplace comfort and attention but there is little flexibility in construction to alleviate the situation.
  • the positioning of the speakers in the top permits getting the most benefit from the use of active noise cancellation.
  • Monitoring microphones 8 and 9 are positioned in the sound field projected from the overhead speakers. Selected sources of sound such as sounds from the engine or fan, not shown, are sensed at the sources for use as input to the active noise cancellation system. Such sound sources have a low probability of containing needed information such as emergency indications essential to the role of the operator.
  • An input microphone 10 on the rear of the enclosure shown dotted may also serve as a remote source of input sound.
  • the sound level in the zone in the enclosure is lowered by a cancellation signal that is developed from the input signals that have been acoustically sensed at remote locations and from signals from the monitor microphones that are mathematically compared in an algorithm using incremental steps until the monitor signal is inimized.
  • the combination of remote sensing and the passive attenuation material reduce the possibility of the undesirable occurrence of feedback of cancellation signal into the input.
  • the top positioning of the cancellation speaker or speakers also contributes to increased simplification of the algorithm. The top positioning permits larger speakers and in many instances a single speaker.
  • a single speaker reduces the number of branches in the model of an adaptive algorithm to a single one. In an adaptive algorithm model a branch is necessary for each source of input to the monitoring microphone.
  • the space for the multiple speakers shown dotted in the top 3 permits a construction where a cancelling signal can be projected throughout the enclosure 1.
  • the speakers can be mounted to extend above the top 3 surface. Where it is undesirable to have the speakers extend above the surface of the top 3 they can be placed inside the enclosure on the under surface of the top 3 by giving up some headroom or selecting minimal height speakers. A satisfactory cancelling speaker is the
  • a satisfactory microphone for use as a monitor microphone is the SM98A by the SHURE Co.
  • a satisfactory microphone for use as an input microphone is a model PZM distributed by the Radio Shack Co.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

Le montage de haut-parleurs (2) pour la suppression active du bruit, sur le toit (3) d'une enceinte d'un opérateur de véhicule (1), permet d'avoir un espace de travail (5) plus vaste et mieux protégé contre le bruit.
PCT/US1994/004194 1993-06-11 1994-04-18 Haut-parleur monte en hauteur pour la suppression active du bruit WO1994029845A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU66664/94A AU6666494A (en) 1993-06-11 1994-04-18 Top speaker mounting for active noise cancellation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7450493A 1993-06-11 1993-06-11
US08/074,504 1993-06-11

Publications (1)

Publication Number Publication Date
WO1994029845A1 true WO1994029845A1 (fr) 1994-12-22

Family

ID=22119910

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/004194 WO1994029845A1 (fr) 1993-06-11 1994-04-18 Haut-parleur monte en hauteur pour la suppression active du bruit

Country Status (2)

Country Link
AU (1) AU6666494A (fr)
WO (1) WO1994029845A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5559893A (en) * 1992-07-22 1996-09-24 Sinvent A/S Method and device for active noise reduction in a local area
WO1996031872A1 (fr) * 1995-04-04 1996-10-10 Technofirst Procede et dispositif personnels d'attenuation acoustique active a reponse impulsionelle invariante
FR2740600A1 (fr) * 1995-10-27 1997-04-30 Metravib Sa Procede et dispositif de reduction active du bruit rayonne par au moins une structure vibrante
FR2805956A1 (fr) * 2000-03-06 2001-09-07 Marc Charbonneaux Transducteur electro-acoustique additionnel pour supprimer les sons parasites
DE102017126883A1 (de) 2017-11-15 2019-05-16 Linde Material Handling Gmbh Arbeitsfahrzeug mit Lärmreduzierung in einer Fahrerkabine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126837A (en) * 1982-08-19 1984-03-28 British Aerospace Noise suppression
DE4026070A1 (de) * 1989-08-22 1991-02-28 Volkswagen Ag Einrichtung zur aktiven verringerung eines geraeuschpegels am ort von personen
EP0434468A2 (fr) * 1989-12-22 1991-06-26 Bridgestone Corporation Dispositif de commande de vibrations
JPH0497699A (ja) * 1990-08-14 1992-03-30 Murata Mfg Co Ltd 乗物用天井スピーカ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126837A (en) * 1982-08-19 1984-03-28 British Aerospace Noise suppression
DE4026070A1 (de) * 1989-08-22 1991-02-28 Volkswagen Ag Einrichtung zur aktiven verringerung eines geraeuschpegels am ort von personen
EP0434468A2 (fr) * 1989-12-22 1991-06-26 Bridgestone Corporation Dispositif de commande de vibrations
JPH0497699A (ja) * 1990-08-14 1992-03-30 Murata Mfg Co Ltd 乗物用天井スピーカ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 16, no. 332 (E - 1236) 20 July 1992 (1992-07-20) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5559893A (en) * 1992-07-22 1996-09-24 Sinvent A/S Method and device for active noise reduction in a local area
WO1996031872A1 (fr) * 1995-04-04 1996-10-10 Technofirst Procede et dispositif personnels d'attenuation acoustique active a reponse impulsionelle invariante
FR2732807A1 (fr) * 1995-04-04 1996-10-11 Technofirst Procede et dispositif personnels d'attenuation acoustique active, siege equipe du dispositif correspondant, et espace a attenuation acoustique active obtenu
US5987144A (en) * 1995-04-04 1999-11-16 Technofirst Personal active noise cancellation method and device having invariant impulse response
FR2740600A1 (fr) * 1995-10-27 1997-04-30 Metravib Sa Procede et dispositif de reduction active du bruit rayonne par au moins une structure vibrante
FR2805956A1 (fr) * 2000-03-06 2001-09-07 Marc Charbonneaux Transducteur electro-acoustique additionnel pour supprimer les sons parasites
WO2001067807A3 (fr) * 2000-03-06 2002-03-28 Perrichon Claude Annie Transducteur electro acoustique pour supprimer les sons parasites
DE102017126883A1 (de) 2017-11-15 2019-05-16 Linde Material Handling Gmbh Arbeitsfahrzeug mit Lärmreduzierung in einer Fahrerkabine
EP3486897A1 (fr) 2017-11-15 2019-05-22 Linde Material Handling GmbH Véhicule de travail à réduction de bruit dans une cabine de conducteur
DE102017126883B4 (de) 2017-11-15 2022-07-28 Linde Material Handling Gmbh Arbeitsfahrzeug mit Lärmreduzierung in einer Fahrerkabine

Also Published As

Publication number Publication date
AU6666494A (en) 1995-01-03

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