EP1733381A1 - System for actively reducing sound - Google Patents

System for actively reducing sound

Info

Publication number
EP1733381A1
EP1733381A1 EP05729401A EP05729401A EP1733381A1 EP 1733381 A1 EP1733381 A1 EP 1733381A1 EP 05729401 A EP05729401 A EP 05729401A EP 05729401 A EP05729401 A EP 05729401A EP 1733381 A1 EP1733381 A1 EP 1733381A1
Authority
EP
European Patent Office
Prior art keywords
microphone
loudspeaker
error signal
panel
sound
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
EP05729401A
Other languages
German (de)
French (fr)
Other versions
EP1733381B1 (en
Inventor
Arthur Perry Berkhoff
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.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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 Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority to EP05729401A priority Critical patent/EP1733381B1/en
Publication of EP1733381A1 publication Critical patent/EP1733381A1/en
Application granted granted Critical
Publication of EP1733381B1 publication Critical patent/EP1733381B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G10K11/17857—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
    • G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17825—Error signals
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

A system for actively reducing sound from a primary noise source, such as traffic noise, comprising: a loudspeaker connector for connecting to at least one loudspeaker for generating anti-sound for reducing said noisy sound; a microphone connector for connecting to at least a first microphone placed adjacent to said loudspeaker; a control unit coupled to said first microphone connector, for providing an error signal, based on the output of said first microphone; and a control unit for outputting a signal to said loudspeaker connector, for controlling said loudspeaker based on said error signal of said control unit; control unit. According to the invention, said control unit is provided with a processor adapted to provide said error signal as a simulated error signal of a virtual microphone placed in the far-field of the loudspeaker. In this way a better noise suppression in the far-field can be achieved.

Description

modified primary spectrum that was obtained by applying a foixrth-order bandpass filter with Butterworth characteristic with lower and upper cutoff frequencies of 0.15 fs and 0.35 fs, respectively, to the primary source signals. With the modified primary source positions and spectrum, a slight improvement was found of the performance on the farfield evaluation microphones from 10.6 dB to 11.4 dB. Furthermore, the performance for a moving source was investigated. The radiation characteristics of the moving sources were simulated by taking into account the doppler shift as weU as the changing radiation characteristics depending on the direction of the movement. Also, simulations were performed in order to study the performance variations for a change in the height of the prima-ry sources. The invention is not limited to the hereabove described embodiments but may comprise variations and modifications thereto while falling under the scope of the annexed claims.

Claims

16Claims
1. A system for actively reducing sound from a primary noise source, such as traffic noise, comprising:
- a loudspeaker connector for connecting to at least one loudspeaker for generating anti-sound for reducing said noisy sound; - a microphone connector for connecting to at least a first microphone placed adjacent to said loudspeaker;
- a control unit coupled to said first microphone connector, for providing an error signal, based on the output of said first microphone; and
- a control unit for outputting a signal to said loudspeaker connector, for controlHng said loudspeaker based on said error signal of said control unit; wherein said control unit is provided with a processor adapted to provide said error signal as a simulated error signal of a virtual microphone placed in the far-field of the loudspeaker. characterized in that said simulated error signal of said virtual microphone is a result of a combination of a first transfer function expressing the far field character of the primary source near said first microphone and a second transfer function expressing the near field character of the secondary source near said first microphone.
2. A system according to claim 1, wherein said loudspeaker is arranged to produce anti-sound in a direction away from said primary noise source.
3. A system according to claim 1, wherein said microphone is placed adjacent in front of said loudspeaker.
4. A system according to any of the preceding claims, wherein a second microphone is placed between said loudspeaker and said primary source. 17
5. A system according to claim 4, wherein said second microphone is arranged to provide a reference signal that is used as a feed forward signal in order to achieve an expected sound pressure level of the primary source near first microphone.
6. A system according to claim 1, wherein said at least one loudspeaker and said at least first microphone are part of an array of loudspeakers and an array of microphones respectively, wherein loudspeakers and said microphones are placed at a distance less than 5 times an interspacing between two adjacent loudspeakers.
7. A system according to claim 1, wherein said at least one loudspeaker and said at least one microphone are part of an array of loudspeakers and an array of microphones respectively, wherein said loudspeakers and said microphones are placed relative to each other in a range between 10% and 100% of an interspacing between two adjacent loudspeakers.
8. A system according to claim 1, wherein said microphone is formed integral with said loudspeaker in a panel to be placed on the side of a road.
9. A system according to any of the preceding claims, further comprising an input for inputting data representing environmental conditions such as wind speed and/or temperature, said processor arranged to provide a transfer function that is dynamically adapted to said environmental conditions.
10. A panel for a noise screen to be placed on the side of the road, for actively reducing noise from a primary source, comprising:
- a loudspeaker to be directed away from the primary source
- a microphone attached to said panel and placed on a distance away from said panel; and
- a system according to any of the claims 1-9. 18
11. A panel according to claim 9 further comprising a second microphone placed opposite to said first microphone, viewed in a direction away from said panel.
12. A panel according to claims 9-11 wherein said loudspeaker is placed on top of said panel.
13. A method of calibrating a system according to any of the claims 1-8 comprising:
- placing a panel according to claim 9 near the side of the road;
- placing a far field microphone at a distance away from said panel and said road;
- measuring an error signal derived from a first microphone placed adjacent to said loudspeaker;
- . measuring a reference signal derived from the far field microphone;
- calibrating said system by a comparison between said error signal and said reference signal.
14. A method for actively reducing sound from a primary noise source, such as traffic noise, comprising:
- deriving an error signal, based on the output of a first microphone placed adjacent to a loudspeaker; and - outputting a driving signal to said loudspeaker based on said error signal for generating anti-sound for reducing said noisy sound;
- wherein said error signal is a simulated error signal of a virtual microphone placed in the far-field of the loudspeaker and wherein said simulated error signal of said virtual microphone is obtained by combining a first transfer function expressing the far field character of the primary source near said first microphone and a second transfer function expressing the near field character of the secondary source near said first microphone. 19
15. A method according to claim 14, further comprising receiving data representing environmental conditions such as wind speed and or temperature, and providing a transfer function that is dynamically adapted to said environmental conditions.
EP05729401A 2004-03-31 2005-03-31 System for actively reducing sound Expired - Lifetime EP1733381B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05729401A EP1733381B1 (en) 2004-03-31 2005-03-31 System for actively reducing sound

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04076031A EP1583075A1 (en) 2004-03-31 2004-03-31 System for actively reducing sound
EP05729401A EP1733381B1 (en) 2004-03-31 2005-03-31 System for actively reducing sound
PCT/NL2005/000234 WO2005096269A1 (en) 2004-03-31 2005-03-31 System for actively reducing sound

Publications (2)

Publication Number Publication Date
EP1733381A1 true EP1733381A1 (en) 2006-12-20
EP1733381B1 EP1733381B1 (en) 2012-12-19

Family

ID=34878274

Family Applications (2)

Application Number Title Priority Date Filing Date
EP04076031A Withdrawn EP1583075A1 (en) 2004-03-31 2004-03-31 System for actively reducing sound
EP05729401A Expired - Lifetime EP1733381B1 (en) 2004-03-31 2005-03-31 System for actively reducing sound

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP04076031A Withdrawn EP1583075A1 (en) 2004-03-31 2004-03-31 System for actively reducing sound

Country Status (2)

Country Link
EP (2) EP1583075A1 (en)
WO (1) WO2005096269A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9704509B2 (en) * 2015-07-29 2017-07-11 Harman International Industries, Inc. Active noise cancellation apparatus and method for improving voice recognition performance
EP3185240A1 (en) * 2015-12-22 2017-06-28 Helmut-Schmidt-Universität System and method for actively reducing noise passing through an opening in a sound barrier

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5315661A (en) * 1992-08-12 1994-05-24 Noise Cancellation Technologies, Inc. Active high transmission loss panel
US5519637A (en) * 1993-08-20 1996-05-21 Mcdonnell Douglas Corporation Wavenumber-adaptive control of sound radiation from structures using a `virtual` microphone array method
US5715320A (en) * 1995-08-21 1998-02-03 Digisonix, Inc. Active adaptive selective control system
US5917919A (en) * 1995-12-04 1999-06-29 Rosenthal; Felix Method and apparatus for multi-channel active control of noise or vibration or of multi-channel separation of a signal from a noisy environment
GB9927131D0 (en) * 1999-11-16 2000-01-12 Royal College Of Art Apparatus for acoustically improving an environment and related method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005096269A1 *

Also Published As

Publication number Publication date
WO2005096269A1 (en) 2005-10-13
EP1733381B1 (en) 2012-12-19
EP1583075A1 (en) 2005-10-05

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