WO2008107403A2 - Dispositif de contrôle visuel de l'efficacité d'un système actif de réduction du bruit - Google Patents

Dispositif de contrôle visuel de l'efficacité d'un système actif de réduction du bruit Download PDF

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Publication number
WO2008107403A2
WO2008107403A2 PCT/EP2008/052520 EP2008052520W WO2008107403A2 WO 2008107403 A2 WO2008107403 A2 WO 2008107403A2 EP 2008052520 W EP2008052520 W EP 2008052520W WO 2008107403 A2 WO2008107403 A2 WO 2008107403A2
Authority
WO
WIPO (PCT)
Prior art keywords
unit
noise reduction
reduction system
active noise
display unit
Prior art date
Application number
PCT/EP2008/052520
Other languages
German (de)
English (en)
Other versions
WO2008107403A3 (fr
Inventor
Harry Bachmann
Original Assignee
Anocsys Ag
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 Anocsys Ag filed Critical Anocsys Ag
Publication of WO2008107403A2 publication Critical patent/WO2008107403A2/fr
Publication of WO2008107403A3 publication Critical patent/WO2008107403A3/fr

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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
    • 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
    • G10K2210/12—Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin

Definitions

  • the present invention relates to an arrangement according to the preamble of claim 1.
  • Noise sources are increasingly perceived as an environmental impact and are considered to reduce the quality of life. In particular, noise is also disturbing in
  • Canceling is based on the cancellation of sound waves through interference, which is generated by one or more electroacoustic transducers, such as loudspeakers, and the signal emitted by the electroacoustic transducers is calculated and continuously corrected using a suitable algorithm.
  • the basis for the calculation of the signals to be radiated by the electroacoustic transducers are those supplied by one or more sensors
  • microphones are suitable as sensors with which the noise to be minimized is detected.
  • information about the remaining residual signal is needed.
  • microphones can be used.
  • the basic principle applied with active noise reduction was Paul Lueg in a patent document from the year 1935 and the disclosure number AT-141 998 3 described. By this document is disclosed how noise in a tube can be extinguished by generating a signal with opposite phase.
  • a system for active noise reduction requires information from at least one sensor (for example a microphone), which determines the residual error.
  • additional sensors are provided that provide information about the nature of the signal to be minimized.
  • an active noise reduction system requires one or more actuators (for example in the form of loudspeakers) for outputting the
  • correction signal The information from the sensors must be converted by an analog-to-digital converter into a digital format, provided that the data processing is performed with a digital computer. After processing by the algorithm, a signal generated by the digital computer is then to be converted back from a digital / analog converter and transmitted to the actuators.
  • the effectiveness and efficiency of a noise reduction system in a room now depends, among other factors, such as computing power and processing speed, also substantially on the acoustic properties of the actuators (such as speakers) and sensors (such as microphones) and their placement.
  • the noise level is caused by the Noise reduction system in the interior of a room (compared to the noise level in the outdoor area) reduced, and the noise-reducing effect is perceived by people acoustically (ie via the ear). This perception is different from person to person and subjective, since each person reacts differently to noise.
  • Whether a noise reduction system is turned on can be determined by connecting a power source supplying power to the noise reduction system to a lamp that lights up when it is turned on. However, whether the noise reduction system provides a noise-reducing effect and how high the noise reduction actually is can not be estimated for the persons in the room.
  • An object of the present invention is therefore to provide an arrangement with an active
  • the invention relates to an arrangement for visually checking the effectiveness of an active noise reduction system for the purpose of calming a room, or parts of a room, wherein the active noise reduction system of at least one - A -
  • Sensor unit at least one actuator unit and at least one processing unit, which is operatively connected to the at least one sensor unit and the at least one actuator unit.
  • the present invention is characterized in that the
  • Processing unit with a display unit for indicating an operation of the active noise reduction system is operatively connected.
  • the arrangement according to the invention has the advantage that a person in the room can visually convince himself of the noise-reducing effect or the mode of action of the active noise reduction system.
  • An embodiment variant of the present invention consists in that an estimated transfer function of the room can be determined in the processing unit, that an input signal of the estimated transfer function determined by a sensor unit is applied for generating an estimated output signal and the estimated output signal of the display unit is applied.
  • Further embodiments of the present invention are that the signal supplied to the display unit is proportional to the efficiency of the active noise reduction system. Further embodiments of the present invention consist in that the signal supplied to the display unit is simultaneously applied to the actuator unit.
  • the display unit is designed as a digital unit or as an analog unit.
  • FIG. 1 Further embodiments of the present invention are that the display unit is located within the room to be calmed.
  • the display unit is located in a room outside the room to be calmed.
  • connection between the display unit and the processing unit is designed to be wired.
  • FIG. 2 is a simplified block diagram of a known noise reduction system with an adaptive algorithm in a schematic representation
  • Fig. 3 is a highly simplified block diagram of a first embodiment of the invention, in more schematic
  • FIG. 4 is a highly simplified block diagram of a second embodiment of the invention, again in schematic representation,
  • FIG. 5 is a highly simplified block diagram of a still further embodiment of the invention, again in schematic representation, and
  • FIG. 6 shows a plan view with a further embodiment of an inventive, active noise reduction system, also in a schematic representation.
  • Fig. 1 shows a plan view of a room 1 in which an active noise reduction system is installed.
  • the active noise reduction system comprises a processing unit 20, a sensor unit 23 (for example a microphone) placed in the space 1 also placed in the space 1 actuator unit 24 (for example, a speaker) and a placed outside the room 1 further sensor unit 22.
  • the area outside the room 1 is designated in Fig. 1 with outer area 26.
  • the sensor unit 23, the actuator unit 24 and the further sensor unit 22 are operatively connected to the processing unit 20 by means of connections 21. With the sensor unit 23 residual noise is detected within the room, on the basis of which and an output signal of the further sensor unit 22, which receives the disturbing external noise, a correction signal is generated in the processing unit 20, which is the actuator unit 24 is supplied.
  • Fig. 2 shows, again in a simplified schematic representation, a block diagram of a known active noise reduction system (called ANC), with the aid of which a noise - for example in a room - eliminated or at least using the principle of signal cancellation is reduced.
  • An output signal x of a sensor unit which is for example a microphone, detects the signal to be minimized, which is fed to a transmission path 2 with a transfer function H.
  • the transfer function H describes the acoustic behavior of the room 1 (FIG. 1). In addition to the acoustic behavior are in the transfer function H also
  • the block diagram according to FIG. 2 also has a filter unit 3 in which a model (the estimated transfer function H) of the actual transfer function H is included.
  • the estimated transfer function H is determined by means of an adaptive algorithm, which is applied to the input signal x and to an error signal e in an adaptive unit 4, the error signal e being determined by the addition unit 5.
  • the addition unit 5 is an actual output d of the transfer function H and the inverted estimated
  • the estimated transfer function fi is applied to the input signal x.
  • the error signal e is then formed again, the adaptive algorithm operating in a known manner, for example a so-called Fx algorithm, such that the error signal e is minimal.
  • FIG. 3 shows in a highly simplified block diagram a first embodiment according to the invention with an amplification unit 14 which is operatively connected to an actuator unit 15 (for example a loudspeaker) and a display unit 16 (for example an incandescent lamp, an LED or a VU meter).
  • an actuator unit 15 for example a loudspeaker
  • a display unit 16 for example an incandescent lamp, an LED or a VU meter.
  • the electrical output signal S of the amplification unit 14 is now sent to the actuator unit 15 and additionally also to an optical display unit 16.
  • a bigger achievement at the exit of the Amplification unit 14 thus causes an increase in the brightness of the optical display.
  • the input signal for the amplification unit 14 serves, for example, the estimated output signal y (FIG. 2) of the filter unit 3.
  • FIG. 4 again shows a simplified schematic representation of a second embodiment according to the invention with an active noise reduction system with the aid of which a noise in a room is eliminated or at least reduced by using the principle of signal cancellation.
  • This is a system that is excellently suited for both noise reduction and visualization of noise reduction.
  • this second embodiment is characterized in particular by the fact that the persons in the room are not disturbed or at least less disturbed when there is external noise and also can visually read the degree of noise reduction which is accomplished by the system at any time.
  • a block diagram is again shown, in turn, as a simple system for active noise reduction, which is applied in a room 1 having a transfer function H and in which an estimated transfer function H is continuously determined.
  • Sensor unit for example, again a microphone, detects the input signal x to be minimized, which is supplied to a transmission path 2 with a transfer function H.
  • the transfer function H describes the acoustic behavior of the room 1.
  • the acoustic Behavior in the transfer function H also transfer characteristics of the components used, such as the microphone unit and the speaker unit included.
  • the embodiment variant according to FIG. 4 like the embodiment variant according to FIG. 3, furthermore consists of a filter unit 3, which contains a model of the actual transfer function H (namely the estimated transfer function H), from an adaptive unit 4 and an addition unit 5 , wherein the input signal x, as described above, both the filter unit 3 and the adaptive unit 4 is applied.
  • the actual output d and an output y estimated by the filter unit 3 are counted together in the adding unit 5, the estimated output y being inverted in advance to obtain the deviation of the two output signals d and y.
  • the output signal y is additionally supplied as a level of one or more display units 8 to 13, wherein the display units 8 to 13 can be embodied in various analog or digital variants, for example as a digital display 8, as an analogue pointer instrument 9, as a digital LED chain 10 or as LED 11.
  • the error signal e is fed to the adaptive unit 4 in which, for example, a known Fx
  • Algorithm is processed.
  • the adaptive algorithm controls the estimated transfer function H in the filter unit 3 such that the error signal e is minimal. It should be noted that other display units 12, 13 are conceivable without leaving the inventive principle.
  • FIG. 5 again shows, in a simplified schematic illustration, a further embodiment according to the invention with an active noise reduction system.
  • Inversion unit 28 obtained signal 1 / e multiplied in a multiplier unit 29 with the estimated output signal y and a display unit 8, 9, 10, 11, 12 or 13, respectively.
  • the inventive arrangement is particularly suitable to visually display the effectiveness of the ANC system, since a small error signal e is synonymous with a high efficiency of the ANC system and thus also with a high brightness, or a high value is displayed on the optical display.
  • Fig. 4 and 5 corresponds to a system for active noise reduction. Furthermore, it is expressly pointed out that any number of microphone units and speaker units are conceivable without leaving the inventive principle. Also, instead of the microphone units and / or the loudspeaker units, other converter units are conceivable.
  • FIGS. 4 and 5 each show a plurality of display units 8 to 13. However, it is not mandatory that all Display units 8 to 13 must be present. Rather, a single or a combination of two or more display units 8 to 13 or
  • Display unit types may be provided, wherein in a plurality of display units 8 to 13 different locations are conceivable.
  • Fig. 6 shows in plan a first space 18 with an active noise reduction system, which consists of a processing unit 20, which over the
  • Connections 21 is operatively connected to a placed in the first space 18 sensor unit 23 (for example, a microphone) for detecting the residual noise within the first space 18 and with an also placed in the first space 18 actuator unit 24 (for example
  • Loudspeaker for outputting the correction signal, as well as with a microphone 22 separated from the first room 18 by a wall 25 from the noise-moderating first room 18 and located in the outside area 26 for detecting the disturbing outside noise.
  • the display unit 16 is located in the first space 18 and is operatively connected to the processing unit 20 via a first connection 17.
  • a display unit 16 ' which is operatively connected to the processing unit 20 via a second connection 17', is located in a second space 19, which is separated from the noise-moderating first space 18.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un dispositif doté d'un système actif de réduction du bruit et destiné à réduire l'effet, dans une pièce, d'une source de bruit se trouvant dans une zone extérieure. Le système actif de réduction du bruit est constitué d'au moins une unité de détection, d'au moins une unité d'actionnement et d'au moins une unité de traitement qui est fonctionnellement reliée à la ou les unités de détection et à la ou les unités d'actionnement. L'invention se caractérise notamment par le fait qu'au moins une unité d'affichage (8,..., 13), reliée à l'unité de traitement, est disposée de telle sorte qu'une personne peut se convaincre, en plus de l'effet acoustique perçu par l'ouïe, également visuellement de l'effet du système actif de réduction du bruit.
PCT/EP2008/052520 2007-03-05 2008-02-29 Dispositif de contrôle visuel de l'efficacité d'un système actif de réduction du bruit WO2008107403A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CHCH00351/07 2007-03-05
CH3512007 2007-03-05

Publications (2)

Publication Number Publication Date
WO2008107403A2 true WO2008107403A2 (fr) 2008-09-12
WO2008107403A3 WO2008107403A3 (fr) 2009-12-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/052520 WO2008107403A2 (fr) 2007-03-05 2008-02-29 Dispositif de contrôle visuel de l'efficacité d'un système actif de réduction du bruit

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Country Link
WO (1) WO2008107403A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4862506A (en) * 1988-02-24 1989-08-29 Noise Cancellation Technologies, Inc. Monitoring, testing and operator controlling of active noise and vibration cancellation systems
EP1293647A2 (fr) * 1996-11-04 2003-03-19 Tenneco Automotive Inc. Dispositif actif de conditionnement du bruit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4862506A (en) * 1988-02-24 1989-08-29 Noise Cancellation Technologies, Inc. Monitoring, testing and operator controlling of active noise and vibration cancellation systems
EP1293647A2 (fr) * 1996-11-04 2003-03-19 Tenneco Automotive Inc. Dispositif actif de conditionnement du bruit

Also Published As

Publication number Publication date
WO2008107403A3 (fr) 2009-12-23

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