WO2008006404A2 - Procédé de fonctionnement d'un système actif de réduction du bruit - Google Patents

Procédé de fonctionnement d'un système actif de réduction du bruit Download PDF

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Publication number
WO2008006404A2
WO2008006404A2 PCT/EP2006/064173 EP2006064173W WO2008006404A2 WO 2008006404 A2 WO2008006404 A2 WO 2008006404A2 EP 2006064173 W EP2006064173 W EP 2006064173W WO 2008006404 A2 WO2008006404 A2 WO 2008006404A2
Authority
WO
WIPO (PCT)
Prior art keywords
determined
time delay
signal
transmission path
transmission
Prior art date
Application number
PCT/EP2006/064173
Other languages
German (de)
English (en)
Other versions
WO2008006404A3 (fr
Inventor
Harry Bachmann
Sigmund Eggenberger
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
Priority to PCT/EP2006/064173 priority Critical patent/WO2008006404A2/fr
Publication of WO2008006404A2 publication Critical patent/WO2008006404A2/fr
Publication of WO2008006404A3 publication Critical patent/WO2008006404A3/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
    • G10K11/1781—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
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • 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
    • G10K11/17813—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17817—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
    • 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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • 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
    • G10K11/17855—Methods, e.g. algorithms; Devices for improving speed or power requirements
    • 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

Definitions

  • the present invention relates to a method for
  • Noise sources are increasingly perceived as environmental pollution and are regarded as a reduction of
  • ANC Active Noise Canceling
  • the principle of Active Noise Canceling is based on the cancellation of sound waves due to interference. These interferences are generated by one or more electro-acoustic transducers, such as loudspeakers.
  • the signal radiated by the electro-acoustic transducers is calculated by means of a suitable algorithm and continuously corrected.
  • the basis for the calculation of the signal to be radiated by the electro-acoustic transducers is the information supplied by one or more sensors. These are on the one hand information about the nature of the signal to be minimized. For this purpose, for example, a microphone can be used which detects the noise to be minimized. On the other hand, but also information about the remaining residual signal needed. Again, microphones can be used.
  • An active noise reduction algorithm requires information from at least one sensor (for example, a microphone) that determines the residual error.
  • another sensor is provided that provides information about the nature of the signal to be minimized.
  • an adaptive noise reduction system requires one or more actuators (for example in the form of loudspeakers) to output the correction signal.
  • the information from the sensors must be converted by an analog / digital converter into a suitable format. After processing by the algorithm, the signal is reconverted from a digital to analog converter and transmitted to the actuators.
  • One problem associated with active noise reduction through adaptive processes is the fact that the adaptive process takes some time to process the signals; All signals to be processed are thus subject to one through the adaptive process caused time delay. This time delay is a limitation. Thus, it is decisive whether a signal can even be processed by the adaptive process at all.
  • ANC Active noise reduction
  • LMS Least Mean Square
  • Fx-LMS Frtered-x-Algorithm
  • the Fx algorithms have good stability and can therefore be used well in ANC systems.
  • the prefix “Fx” indicates the reproduction of the so-called “secondary path”, which includes the characteristics of the actuators, sensors, amplifiers, analog / digital converters, digital / analog converters and the transmission path as well as all other influences includes the signal to be transmitted.
  • the “secondary path” is also referred to below as "component influence”.
  • offline modeling of the secondary path (component influence).
  • the known method for determining the secondary path is therefore referred to as "offline modeling", since the properties of the secondary path are determined beforehand, ie while the system is not in operation.
  • the present invention is therefore based on the object to provide a method which does not have the disadvantages mentioned above.
  • the invention relates to a method for operating an active noise reduction system comprising a transmission path consisting of at least one Actuator, a space and at least one sensor unit, wherein a replica of the transmission path is made such that in the room reaching noise is eliminated or at least reduced.
  • the invention is characterized in that a time delay resulting from transmission characteristics of the space and / or actuator unit and / or sensor unit is determined and that the determined time delay is taken into account in the simulation of the transmission path. This ensures that with changing characteristics of the transmission line, the active noise reduction system does not become unstable.
  • the time delay is of paramount importance, as it is strongly dependent on temperature changes and at the same time exerts a great influence on the stability.
  • a further embodiment of the method according to the invention is characterized in that the time delay is determined from a residual signal which is generated from an output signal of the transmission path and an output signal of the simulated transmission path and either an input signal of the transmission path or a signal derived therefrom.
  • a more specific embodiment is that the determination of the time delay in the time domain. Another embodiment is that the time delay is determined from a convolution of the residual signal with an input signal of the transmission path or a signal derived therefrom.
  • a still further embodiment variant is that spectral transmission properties of space, actuator unit and sensor unit are determined in the frequency domain and that the spectral transmission characteristics are taken into account in the simulation of the transmission path.
  • a still further embodiment variant is that an amplitude spectrum is determined from the spectral transmission characteristics and that the amplitude spectrum is taken into account in the simulation of the transmission path.
  • a further embodiment variant is that at least one of the following properties is determined when a change in these properties must be expected: Time delay, •
  • a further embodiment variant is that the temperature in the room is determined and that a redetermination of the transmission properties, namely time delay, amplitude spectrum and / or spectral transmission properties, is triggered when the temperature changes above a predetermined value.
  • Transmission properties lie within a predetermined range around existing or prior to the start of the active noise reduction system determined transmission characteristics.
  • Fig. 1 is a simplified block diagram of an active
  • FIG. 3 is a simplified block diagram of an active noise reduction system employing a secondary path determination method of the invention during operation.
  • FIG. 4 shows a further simplified block diagram of an active noise reduction system according to the invention, in which a method according to the invention for determining the secondary path during operation is used,
  • Fig. 5 is a perspective view of a room in which an active noise reduction system is used.
  • 6 and 7 show two courses of an impulse response, with reference to which a further embodiment for determining the time delay is explained.
  • Fig. 1 shows, in a simplified representation, a block diagram of a noise reduction system, with which the so-called Secondary-Path (component influence) is determined.
  • the noise reduction system consists of a signal source 1, which generates a reference signal x (n) 2.
  • the reference signal x (n) is emitted by an actuator unit 3 into a room 11 and received there by a sensor unit 4.
  • the received signal is influenced in the example shown by the properties of the actuator unit 3, the sensor unit 4 and the space 11, which is referred to as secondary-path or component influence.
  • the signal emitted by the actuator unit 3 moves in the space 11 at a predetermined speed, which depends in particular on the air humidity and the temperature of the air.
  • the transit time (or the time delay) which the reference signal x (n) sent by the actuator unit 3 to the sensor 4 requires is designated T.
  • the reference signal x (n) is further supplied to a filter unit 9 with an adjustable transfer function, which is adjusted by means of an adaptive unit 10 such that a residual signal e (n), which is determined from the output signals of the sensor unit 4 and the filter unit 9, is minimal. This comes in the
  • Filter unit 9 is an adaptive algorithm used. To form the residual signal e (n), an addition unit 7 is provided after the sensor unit 4, in which the difference between the output signals of the sensor unit 4 and the filter unit 9 is formed
  • Output of the filter unit 9 is inverted before the addition unit 7 is applied.
  • the filter unit 9 thus describes in an optimum case the properties of the actuator unit 3, the sensor unit 4 and the space 11.
  • the influence of room 11 should be as small as possible in the calculations. It is therefore advisable to place the actuator unit 3 as close as possible to the sensor unit 4.
  • the influences of the space 11 and the time delay T required by the reference signal x (n) can not be completely ruled out.
  • the secondary path determined with such a method is therefore subject to an error. Accordingly, the quality of the active noise reduction system based on such secondary-path adjustment is reduced.
  • the method used is also referred to as "offline modeling".
  • the parameters of the secondary path are thereby preferably determined in a time period during which the system does not make an active noise reduction, i. the noise reduction system, only the known reference signal x (n) of the signal source 1 is supplied.
  • a reference signal x (n) for example, a white noise is used.
  • the transfer function of the filter unit 9 completely describes the secondary path, ie the influence of the components, for example in the form of a frequency-dependent function.
  • it is not the entire frequency-dependent function that is of primary interest, but primarily the time delay T, which experiences a signal from the actuator unit 3 to the sensor unit 4. by virtue of the "off-line" determination of the time delay T is an indication of the range in which the time delay T is most likely to be during the operation of the noise reduction system.
  • the conditions are created to continuously determine the changing component influence during normal operation of the noise reduction system and make appropriate corrections. The method used in this regard will be explained with reference to FIG. 2.
  • Fig. 2 shows, again in a simplified representation, a block diagram of a known active noise reduction system in which the parameters of the secondary path, in particular the time delay T, in advance, i. "off-line" or before the normal operation of the active noise reduction system, have been determined.
  • the determination of the parameters of the secondary path, i. the transfer function of the secondary path, in particular the time delay T, is carried out, for example, according to the explanations in connection with FIG.
  • a sensor unit detects the unknown signal x (n) to be minimized, which is applied to the transmission path 6 with the transfer function H (n).
  • Secondary path namely in particular the properties of the actuator units and sensor units which are known in advance or known by the manufacturer, and the acoustic path between the actuator unit and the sensor unit is denoted by 13 and has a transfer function S (n) on.
  • S (n) is an estimate of the characteristics of the secondary path determined according to the "off-line” method, wherein the parameters of the actuator unit and the sensor unit, in addition to the room characteristics and the temperature at the time of determining the secondary path also included in the esteemed secondary path S (n).
  • the adaptive algorithm processed in the adaptive unit 10 provides the transfer function of
  • Sensor unit also influences the stability of the overall system during the processing of the input signal x (n).
  • the instantaneous time delay T is not continually adjusted to the current conditions, the whole system is less stable when, for example, the temperature in the room changes. Accordingly, the performance deteriorates or the active noise reduction system becomes unstable.
  • FIG. 3 shows, in a simplified representation, a block diagram of an inventive active noise reduction system, in which a method for determining the properties of the secondary path under Inclusion of the occurring and time-varying time delay T is used.
  • a delay time difference ⁇ T is determined which corresponds to the deviation from the delay time T determined by the "off-line" method. Variants in which each of the actual delay time is determined directly, are also conceivable.
  • Block 14 includes an estimate of the secondary-path characteristics in the frequency domain, where signal delays - such as the delay time - are not included in this estimate because only the amplitude spectrum is considered.
  • the delay time T of the estimated secondary path S (n) is set in the variable time delay element 18, wherein the adjustment of the time delay T is ongoing, i. during operation of the active noise reduction system.
  • the interaction of the blocks 14 and 18 thus gives a complete estimate of the transfer function of the secondary path, including the occurring delay time of the signal.
  • the block 14 representing the estimated secondary path is not provided, which means that the amplitude spectrum of the secondary path is not taken into account, but only the current time delay. It has been shown that the current time delay by far the has the greatest influence on a possible instability of the active noise reduction system. With the consideration of the constantly changing delay time during the operation of the active noise reduction system, ie with the determination and
  • Block 13 is the secondary path S (n) including the delay time T.
  • the transmission path with the transfer function H (n) is again denoted by 6.
  • the input signal x (n) is supplied to the transmission link 6, the estimated secondary path (block 14), a switching unit 17 and the filter unit 9.
  • the filter unit 9 is set by the adaptive unit 10, in which an adaptive algorithm is executed, wherein the filter unit 9, which may be in particular of the type transverse FIR filter, recursive IIR filter or lattice filter, set such that the residual signal e (n + a) designated output signal of the addition unit 7 is minimal.
  • Either the output signal y of the filter unit 9 or the input signal x (n) is selected by means of the switching unit 17 and used as the signal f (n), which is supplied to the correlation unit 16.
  • the switching unit 17 can be set automatically by a user, for example, manually or by means of a control unit (not shown in FIG. 3). This is a choice to choose the way of determining the current delay time. So there are two variants that can be selected on the switch position in the switching unit 17. However, it is also conceivable that one or the other embodiment variant is implemented, so that no switching unit is necessary and the determination of the
  • Delay time is limited to the realized embodiment. Of course, such a realization does not allow switching to another variant.
  • the cross-correlation between the signal f (n) and the residual signal e (n + a) is calculated, giving a measure of the time delay difference ⁇ T between these signals - or possibly the instantaneous time delay directly - is determined.
  • the adjustment of the current time delay in the time delay element 18 can be adjusted.
  • the signal f (n) may be either the input signal x (n) or the output signal y of the filter unit 9 in accordance with the switching state of the switching unit 17. Both signals are suitable, since in both signals information about the waveform is included before an injection into the to calm the room. Thus, a cross-correlation of the signal f (n) with the residual signal e (n + a) as calculated in the correlation unit 16 gives results with respect to the time delay ⁇ T that a signal experiences through the room to be quieted. The time delay ⁇ T calculated in the correlation unit 16 is given to
  • Time delay element 18 is supplied for adaptation, whereby the controlled with this adaptive algorithm, which is processed in the adaptive unit 10, much more stable.
  • Correlation unit 16 is constantly in operation. It is conceivable in a further embodiment of the invention that a temperature measuring unit (not shown in Fig. 3) is provided, which is arranged in the room to be calm and sends a start signal to the correlation unit 16 as soon as the temperature changes by a predetermined value. Only by an active start signal to the correlation unit 16 do a recalculation of a correlation and a forwarding of the new value for the delay time to the delay element 18 begin.
  • an area in which the greatest correlation is to be expected is predefined, this range being derived either from a previous value for the time delay or from the time delay determined with the "off-line" method, for example the time delay value, a tolerance range is superimposed.
  • the determination of the new time delay is then limited to the determination of the largest correlation in this tolerance range. This largest correlation then gives the new time delay.
  • FIG. 4 shows, again in a simplified representation, a block diagram of a further active noise reduction system according to the invention, in which a further method for determining the properties of the secondary path, taking into account the occurring time delays, is used.
  • Block 23 is an additional time delay. Likewise - in the same signal path - another block with the estimated secondary path 25 included. Blocks 14 and 25 are the same estimate S (n) of the secondary path, even though they are not physically the same filter, ie, blocks 14 and 25 have the same transfer function, but become independent of each other operated.
  • the transfer functions may be the
  • Amplitude spectrum of the estimated secondary path act, in which case the delay time is not taken into account.
  • the delay time is then contained in the delay element 18 and in the further delay element 23.
  • both time delay elements 23 and 18 are set at the same value ⁇ T. Different values selected in the
  • Time delays 23 and 18 can lead to instabilities of the system.
  • Filter 22 which in turn can be of the type transverse FIR filter, recursive IIR filter or lattice filter.
  • the output signal from the filter 22 is subtracted in a second addition unit 21 from the output signal of the filter unit 9, which may also be of the type transverse FIR filter, recursive IIR filter or lattice filter.
  • a signal is inputted Feedback path formed.
  • a minimization of the residual signal e (n + a) is attempted.
  • a variant of the embodiment according to FIG. 4 is that the blocks 14 and 25, which contain the estimated transfer function of the secondary path without delay time, are omitted since the delay time is the most important one Information for the stabilization of the entire system applies.
  • switching unit 17 again points to the two alternative embodiments, as they have already been explained with reference to FIG. 3.
  • Fig. 5 shows a space 26 in which an actuator unit 27 (for example a loudspeaker) emits a reference signal which is received by a sensor unit 28 (for example a microphone).
  • the time t amb 29 is the time that the signal output by the actuator unit 27 is for
  • the time t amb is thus dependent on the distance between the actuator unit 27 and the sensor unit 28.
  • time t amb is a part of the total
  • Time is, which has been referred to in Fig. 1 as a time delay T.
  • a further embodiment of the inventive method will be explained, with which the Time delay T can be determined.
  • the time delay T required for the suppression is determined.
  • the component contained in the impulse response H (t) which occurs before a first maximum 31 of the impulse response H (t) is erased, for example by means of a known peak search method, by a certain number in the information contained in the impulse response Samples are looked back.
  • a curve as shown in FIG. 7 is obtained.
  • the advantage of this method is that the delay time T can be determined very accurately.

Abstract

Procédé de fonctionnement d'un système actif de réduction du bruit présentant une voie de transmission qui est constituée d'au moins une unité actionneur (3), d'un espace (11) et d'au moins une unité détecteur (4). La voie de transmission est reproduite de telle façon que les parasites arrivant dans l'espace (11) sont supprimés ou au moins réduits. L'invention est caractérisée par la détermination du temps de propagation (T) dû aux caractéristiques de transmission de l'espace (11), de l'unit actionneur (3) et de l'unité détecteur (4) et par la prise en considération lors de la reproduction de la voie de transmission du temps de propagation (T) déterminé. Le temps de propagation (T) pendant le fonctionnement peut être déterminé avec une complexité technique nettement moindre que la détermination de toutes les caractéristiques de transmission, ce qui permet de réduire la complexité de calcul et donc les coûts du matériel nécessaire.
PCT/EP2006/064173 2006-07-13 2006-07-13 Procédé de fonctionnement d'un système actif de réduction du bruit WO2008006404A2 (fr)

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Application Number Priority Date Filing Date Title
PCT/EP2006/064173 WO2008006404A2 (fr) 2006-07-13 2006-07-13 Procédé de fonctionnement d'un système actif de réduction du bruit

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Application Number Priority Date Filing Date Title
PCT/EP2006/064173 WO2008006404A2 (fr) 2006-07-13 2006-07-13 Procédé de fonctionnement d'un système actif de réduction du bruit

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WO2008006404A3 WO2008006404A3 (fr) 2008-03-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8385559B2 (en) 2009-12-30 2013-02-26 Robert Bosch Gmbh Adaptive digital noise canceller

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0471290A2 (fr) * 1990-08-16 1992-02-19 Hughes Aircraft Company Atténuateur adaptif actif du bruit sans mode d'entraînement
DE19526098C1 (de) * 1995-07-18 1996-09-12 Stn Atlas Elektronik Gmbh Verfahren zur Maximierung der Dämpfungswirkung einer Vorrichtung zur aktiven Geräuschdämpfung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0471290A2 (fr) * 1990-08-16 1992-02-19 Hughes Aircraft Company Atténuateur adaptif actif du bruit sans mode d'entraînement
DE19526098C1 (de) * 1995-07-18 1996-09-12 Stn Atlas Elektronik Gmbh Verfahren zur Maximierung der Dämpfungswirkung einer Vorrichtung zur aktiven Geräuschdämpfung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8385559B2 (en) 2009-12-30 2013-02-26 Robert Bosch Gmbh Adaptive digital noise canceller

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