EP2472510B1 - Dispositif de contrôle du bruit et procédé de contrôle du bruit - Google Patents

Dispositif de contrôle du bruit et procédé de contrôle du bruit Download PDF

Info

Publication number
EP2472510B1
EP2472510B1 EP09849773.8A EP09849773A EP2472510B1 EP 2472510 B1 EP2472510 B1 EP 2472510B1 EP 09849773 A EP09849773 A EP 09849773A EP 2472510 B1 EP2472510 B1 EP 2472510B1
Authority
EP
European Patent Office
Prior art keywords
signal
noise reduction
noise
identification
control
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.)
Active
Application number
EP09849773.8A
Other languages
German (de)
English (en)
Other versions
EP2472510A4 (fr
EP2472510A1 (fr
Inventor
Susumu Fujiwara
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2472510A1 publication Critical patent/EP2472510A1/fr
Publication of EP2472510A4 publication Critical patent/EP2472510A4/fr
Application granted granted Critical
Publication of EP2472510B1 publication Critical patent/EP2472510B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • G10K11/1787—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
    • 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
    • G10K11/1785—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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/112—Ducts
    • 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
    • G10K2210/3027—Feedforward
    • 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
    • G10K2210/3045—Multiple acoustic inputs, single acoustic output
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3048—Pretraining, e.g. to identify transfer functions
    • 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
    • G10K2210/3049—Random noise used, e.g. in model identification

Definitions

  • the present invention relates to a noise control apparatus and noise control method for actively controlling noise.
  • ANC active noise control
  • ANC cancels noise in a noise reduction region region that is a target for noise control; this definition applies to the following description) by emitting a noise reduction signal with the same strength but with a phase that is the inverse of that of a noise signal and causing the noise signal and the noise reduction signal to interfere with each other.
  • US5517571A discloses an active noise attenuating device includes a first microphone located in a propagation path of noise, a loud speaker located downstream from the first microphone, a second microphone located downstream from the loud speaker for receiving sound, and an operational unit for executing an operation on the basis of a detection signal from the first microphone to generate a control signal supplied to the loud speaker so that a sound interfering with the noise is produced.
  • An operational factor of the operational unit is controlled by an adaptive controller on the basis of the detection signal from the second microphone so that an amount of noise attenuated by the sound produced from the loud speaker is rendered maximum.
  • a transfer characteristic of a transfer path between the loud speaker and the second microphone is identified on the basis of the detection signals generated by the second microphone when a sound represented by a periodical identifying signal is produced in a plurality of periods.
  • An operational factor of the adaptive controller is adjusted by an adaptive control identifying unit on the basis of the identified transfer characteristic.
  • US5384853A discloses an apparatus for active reduction of noises transmitted from a noise source into a space.
  • the active noise reduction apparatus comprises residual noise sensors for detecting the residual noises in the space.
  • a reference signal is produced based upon the noise generating condition of the noise source.
  • the reference signal is used, along with the detected residual noises, to drive control sound sources so as to reduce the noises in the space.
  • a filter is adjusted to correspond to acoustic transfer characteristics between the control sound sources and the residual noise sensors.
  • An identification sound is generated to correspond to the background noise level detected in the space and to the spectral distribution of the noises transmitted into the space.
  • the coefficients of the filter are updated according to acoustic transfer characteristics between the control sound sources and the residual noise sensors. The acoustic transfer characteristics are obtained based upon the identification sound and the residual noises.
  • JPH0732947A discloses a solution to carry out a good noise reduction control without giving an unpleasant feeling to occupants, by filter-processing a residual noise signal by a transfer function reverse filter, so as to make into a constitution to produce an identification signal.
  • US4677676A discloses an active acoustic attenuation system is provided that actively models direct and feedback paths as well as characteristics of the secondary cancelling sound source and the error path on an on-line basis.
  • the primary model uses a recursive least mean squares RLMS algorithm that is excited by the input acoustic noise and uses the residual acoustic noise as an error signal.
  • the secondary sound source or cancelling speaker and the error path are modeled by a second algorithm, particularly an LMS algorithm, that uses an additional auxiliary low level, random, uncorrelated noise source as an input signal.
  • the resulting overall system provides excellent attenuation of narrow band and broad band noise over a relatively wide frequency range on a completely adaptive basis without directional transducers.
  • JPH10254459A discloses a solution to identify a secondary sound path (a transfer function) without being adversely affected by disturbance noise.
  • Noise control in real time on a noise signal that is propagating to a closed space or open space (opened space) and varying its frequency component in real time requires feedforward control for accurately detecting the signal component from a noise source and reducing noise in a bandwidth for noise reduction.
  • the feedforward control needs a sensor device for searching for a noise source, a sensor device for determining a noise reduction region, and a speaker device for generating a noise reduction signal. An algorithm for controlling these devices is also necessary.
  • identification operation determines the size of a noise reduction region and the effects of an object that reflects a signal on the basis of the time from emission of an audio signal with a certain sound pressure and a certain frequency for a certain period of time from a control speaker to input of the sound reflection from the control speaker directly or indirectly into the sensor device.
  • this identification operation is carried out before noise control starts. If some kind of change occurs in an unknown sound field environment during noise reduction operation or a sudden movement arises in a control speaker or a sensor device, the state of an acoustic environment in the noise reduction region changes. This change makes the noise control inefficient.
  • a signal that contains all frequency bands, including white noise and pink noise is emitted from a control speaker to grasp frequency characteristics in a noise reduction region to determine an acoustic environment in the noise reduction region. At this time, it is necessary to temporarily halt noise control in order to emit the signal with a sound pressure that is equal to or more than a sound level of noise to be reduced.
  • the signal emitted in this identification operation may cause a "noise" state in the noise reduction region.
  • the present invention is made to address the above-described issues and is directed to provide a noise control device and noise control method capable of controlling noise in response to a change of an acoustic property in a noise reduction region.
  • the noise control apparatus includes one or more reference sensors for detecting a noise signal produced by a noise source, one or more sound emitting sources for emitting a noise reduction signal and an identification signal, an error sensor for detecting the noise signal, noise reduction signal, and identification signal, identification means for carrying out an identification operation of identifying an acoustic property in a noise reduction region based on the identification signal detected by the error sensor, and noise reduction signal generating means for generating the noise reduction signal by adaptive signal processing based on the detection by at least one of the reference sensors and the detection by the error sensor.
  • the identification means carries out the identification operation while at least one of the sound emitting sources emits the noise reduction signal.
  • an identification operation for a noise reduction region is carried out during noise control. Accordingly, even if a change of an acoustic property in the noise reduction region is caused by an environmental variation, appropriate noise control in response to the change can be achieved.
  • the noise control apparatus suppresses propagation of noise produced by, for example, a fan of air-conditioning equipment through a fan duct and emission of the noise to a room to be air-conditioned.
  • noise control requires a sensor device for searching for a noise source, a sensor device for determining a noise reduction region, and a speaker device for generating a noise signal.
  • the noise control can be classified into two types: single-channel control for a case where the number of each of these devices is one and multi-channel control for a case where the number of at least one of these devices is more than one.
  • the noise control apparatus according to the present invention is applicable to both the single-channel control and the multi-channel control. An arrangement for the single-channel control and an arrangement for the multi-channel control are described below in sequence.
  • Fig. 1 is a functional block diagram for describing a noise control apparatus 100 according to the present embodiment.
  • Fig. 1 illustrates an example of the noise control apparatus 100 for single-channel control.
  • a duct 10 is a passage for air issuing from air-conditioning equipment (not illustrated), with a noise source 11 at the upstream side, and has an opening portion 10a opened toward an air-conditioning target region at the downstream side.
  • This noise control system suppresses propagation of noise produced by the noise source 11 at the upstream side through the duct 10 and emission of the noise to the air-conditioning target region. That is, the air-conditioning target region positioned downstream of the duct 10 is a noise reduction region.
  • the noise source 11 is a rotational mechanism, such as a fan or motor.
  • the noise control apparatus 100 includes a reference sensor 2, a secondary sound source 3, an error sensor 4, and a computation processor 5.
  • the reference sensor 2 is a sensor for detecting an acoustic signal component from the noise source 11 that propagates through the duct 10 and transmitting the detected value to the computation processor 5.
  • the reference sensor 2 is disposed in the vicinity of the noise source 11 so as to detect an acoustic property of the noise source 11.
  • a path of a plurality of input signals from the reference sensor 2 is represented as an input-signal path R(N).
  • the vibration sensor 2 can be directly placed on the noise source 11, for example, a fan or motor, to directly detect vibration, or alternatively, it can be fixed to a structure in which the noise source 11 is placed, such as the duct 10, in accordance with the fixation of the noise source 11 to indirectly detect vibration.
  • the secondary sound source 3 emits a noise reduction signal under the control of the computation processor 5.
  • a case in which a speaker is used as the secondary sound source 3 is described as an example.
  • the secondary sound source 3 is referred to as the control speaker 3.
  • the control speaker 3 is placed at a given location downstream of the reference sensor 2 in the duct 10.
  • the error sensor 4 is placed at a given location downstream of the control speaker 3 and is a sensor for detecting an acoustic signal component and transmitting the detected value to the computation processor 5.
  • a case in which a microphone is used as the error sensor 4 is described as an example.
  • a transfer path of a plurality of input signals from the error sensor 4 (hereinafter referred to as error signals e(N)) is represented as an error-signal path E(N).
  • the acoustic signal component detected by the error sensor 4 indicates noise at the location where the error sensor 4 is placed. Accordingly, the noise control apparatus 100 aims at minimizing the error signals e(N) (rendering them zero as close as possible).
  • the computation processor 5 includes an inverse filter stage 8, a computation stage 6, and an adaptive filter stage 7 and performs signal processing and filter processing to control noise. Specifically, the computation processor 5 performs adaptive-signal processing of generating a noise reduction signal for reducing the acoustic property of noise on the basis of signals detected by the reference sensor 2 and the error sensor 4.
  • the computation processor 5 corresponds to noise reduction signal generating means and identification means in the present invention.
  • the vicinity of the opening portion 10a is a noise reduction region.
  • the acoustic property of this noise reduction region is unknown.
  • a transfer path 20 is one through which an acoustic component connecting the control speaker 3 and the error sensor 4 is transferred.
  • the transfer path 20 has a signal transfer characteristic C, and the signal transfer characteristic C is represented by a transfer function A.
  • a transfer path 30 is one through which an acoustic component connecting the reference sensor 2 and the control speaker 3 is transferred.
  • the transfer path 30 has a signal transfer characteristic F, and the signal transfer characteristic F is represented by a transfer function B.
  • temporal characteristics of the transfer function A and the transfer function B are obtainable by emitting a given signal from the control speaker 3 for a given period of time and detecting the given signal by the use of the reference sensor 2 and the error sensor 4.
  • the locations where the reference sensor 2 and the error sensor 4 are placed and the number thereof can also be determined.
  • the inverse filter stage 8 convolves an input signal input from the reference sensor 2 through the input-signal path R(N) and generates a signal having a phase that is the inverse of that of the input signal.
  • the signal with the inverted phase is transmitted to the adaptive filter stage 7 and is used in updating the filter characteristics of the adaptive filter stage 7.
  • the signal with the inverted phase is also transmitted to the computation stage 6.
  • the computation stage 6 performs computation based on the least squares method for minimizing the error signal e(N) input from the error sensor 4.
  • the result of the computation by the computation stage 6 is transmitted to the adaptive filter stage 7 and is used in updating the filter characteristics of the adaptive filter stage 7.
  • the computation stage 6 performs computation for rendering the signal component with the inverted phase generated by and transmitted from the inverse filter stage 8 to zero as close as possible.
  • the computation stage 6 compares the phase characteristics of the acoustic signal transmitted from the inverse filter stage 8 against the phase characteristics of the error signal e(N) transmitted from the error sensor 4. In this way, among signals propagating to the noise reduction region and input to the error sensor 4, signals other than ones from the noise source 11 can be identified as extraneous signals.
  • the extraneous signals can be considered to be an environmental change factor that varies the acoustic property in the noise reduction region.
  • the extraneous signals are transmitted to the adaptive filter stage 7 and are used in updating the filter characteristics of the adaptive filter stage 7.
  • the adaptive filter stage 7 is a filter having the filter characteristics set to generate a noise reduction signal.
  • the adaptive filter stage 7 performs adaptive-signal processing for updating the filter characteristics at the appropriate times to cancel an ever-changing noise signal from the noise source 11.
  • the adaptive filter stage 7 updates the filter coefficient on the basis of the signal with the inverted phase to the input signal generated by the inverse filter stage 8, the result of the computation at the computation stage 6, and the extraneous signals, which are described above.
  • the use of the extraneous signals enables stable noise reduction operation that takes effects of the extraneous signals (environmental change factor for the noise reduction region) into consideration.
  • the acoustic signal component of the noise reduction signal generated by the adaptive filter stage 7 is transmitted to the control speaker 3 and emitted from the control speaker 3. In this way, an audio signal component of the noise reduction signal emitted from the control speaker 3 cancels the audio signal component from the noise source 11.
  • Fig. 2 is an example functional block diagram for describing control operation of the noise control apparatus 100 and illustrates a configuration for the multi-channel control.
  • some elements illustrated in Fig. 1 such as the duct 10 and the noise source 11, are not illustrated, and only the functional blocks are shown.
  • the noise control operation for the multi-channel control is described with reference to Fig. 2 , and the description focuses on differences from the configuration illustrated in Fig. 1 .
  • the same reference numerals are used for the same or corresponding elements in Fig. 1 .
  • the multi-channel control illustrated in Fig. 2 generates an M-channel noise reduction signal on the basis of a K-channel input from the reference sensor 2 and exercises control for minimizing an L-channel error signal e(N) detected by the error sensor 4.
  • K, L, and M is one or more.
  • a transfer path of a noise reduction signal from the control speaker 3 (not illustrated in Fig. 2 ) to the error sensor 4 is represented by an error path C(N).
  • a computation processor 9 performs computation for updating the filter characteristics of an adaptive filter stage 7a on the basis of a signal input from the reference sensor 2 through the input-signal path R(N) and an error signal e(N) from the error sensor 4.
  • the adaptive filter stage 7a includes an adaptive filter W supporting a plurality of channels and generates a noise reduction signal.
  • the adaptive filter stage 7a includes one or more input channels and one or more output channels and is connected to the control speaker 3.
  • the noise reduction signal generating means and the identification means in the present invention correspond to the computation processor 9 and the adaptive filter stage 7a in Fig. 2 .
  • the acoustic signal component of the noise reduction signal generated by the adaptive filter stage 7a is transmitted to the control speaker 3 (not illustrated in Fig. 2 ) and emitted from the control speaker 3. In this way, the audio signal component of the noise reduction signal emitted from the control speaker 3 cancels the audio signal component from the noise source 11.
  • an identification operation according to the present embodiment is described. As previously described, conventionally, an identification operation has been carried out before noise control. In contrast, for the present embodiment, an identification operation is carried out during noise control, in addition to before the noise control.
  • the noise control apparatus 100 emits a noise reduction signal and an acoustic signal component for use in an identification operation (hereinafter referred to as identification signal) from the control speaker 3 in such a way that they are superimposed.
  • the identification signal is an impulse signal and has a sound pressure level lower than that of the noise reduction signal by 3 dB or more.
  • the identification signal is emitted for a certain period of time at certain intervals.
  • Fig. 3 is an illustration for describing an identification signal used in an identification operation carried out during noise control.
  • an identification signal whose emission period is 0.5 seconds or less is emitted at intervals of approximately 3 seconds. This period of the identification signal is in the minimum time relation for minimizing effects on human perception to sound reflection.
  • the period of emission of the identification signal (i.e., period of the identification operation) for each operation can be between one minute and five minutes inclusive, for example.
  • the frequency component of the identification signal a component in the range from a given low-frequency component required for noise reduction (e.g., 5 Hz) to a frequency component of low sensitivity in human hearing characteristics (e.g., 1 kHz or less) can be used.
  • a component in the range from a given low-frequency component required for noise reduction (e.g., 5 Hz) to a frequency component of low sensitivity in human hearing characteristics (e.g., 1 kHz or less) can be used.
  • the identification signal is not perceptible to humans, and thus the discomfort sensed by humans caused by the identification operation can be suppressed.
  • Figs. 1 and 2 transfer paths of identification signals are represented by identification-signal paths D(N); for the sake of the description, the identification-signal paths D(N) are distinguished into transfer paths 40 to 44.
  • an identification signal generated by the adaptive filter stage 7 is transmitted to the control speaker 3 through the transfer path 40 and emitted from the control speaker 3.
  • the identification signal emitted from the control speaker 3 is input to the error sensor 4 through the transfer path 41.
  • the identification signal input to the error sensor 4 is transmitted to the adaptive filter stage 7 through the transfer path 42.
  • the adaptive filter stage 7 convolves the acoustic property of the transmitted identification signal and acquires a change in the frequency characteristics as a change in the noise reduction region.
  • the change in the noise reduction region is monitored by comparing the acoustic property obtained in the identification operation during noise control and the acoustic property obtained before the noise control.
  • the adaptive filter stage 7 reflects the change in the noise reduction region acquired at the previous stage in the above-described processing of generating the noise reduction signal. In this way, the noise reduction signal generated by the use of the filter characteristics in response to the change in the noise reduction region can be emitted from the control speaker 3. Accordingly, even if a change in the sound field characteristics is caused by an environmental variation in a noise reduction region, stable noise control can be achieved.
  • an identification signal generated by the adaptive filter stage 7a is emitted from the control speaker 3 and input to the error sensor 4 through the transfer path 43.
  • the identification signal input to the error sensor 4 is input to the computation processor 9 through the transfer path 44.
  • the computation processor 9 performs computation on the transmitted identification signal on the basis of a predetermined algorithm and acquires a change in the frequency characteristics as a change in the noise reduction region. The change in the noise reduction region is monitored by comparing the acoustic property obtained in the identification operation during noise control and the acoustic property obtained before the noise control.
  • the adaptive filter stage 7a reflects the change in the noise reduction region acquired at the previous stage in the above-described processing of generating the noise reduction signal. In this way, the noise reduction signal generated by the use of the filter characteristics in response to the change in the noise reduction region can be emitted from the control speaker 3. Accordingly, even if a change in the sound field characteristics is caused by an environmental variation in a noise reduction region, stable noise control can be achieved.
  • Such an identification operation during noise control can be repeated at given times in a control process in a day, for example.
  • the identification operation can be carried out three times at specified times in the morning, noon, and evening, or alternatively, it can be carried out twice at specified times in the morning and evening. In this way, an environmental variation in the noise reduction region can be determined.
  • the identification operation is carried out during noise control, the noise reduction signal in response to the noise reduction region that has varied can be emitted without having to halt the noise control operation for the noise reduction region.
  • the identification operation for the noise reduction region is also carried out during noise control. Accordingly, the noise control in response to the sound field characteristics in the noise reduction region can be achieved. In addition, because the identification operation and the noise control are carried out simultaneously, it is not necessary to halt the noise control for the noise reduction region.
  • the identification signal used in the identification operation during noise control is lower than the sound pressure level of the noise reduction signal by 3 dB or more. Accordingly, the identification signal substantially does not affect the noise reduction signal.
  • the identification signal used in the identification operation during noise control can have an energy component that is half the sound pressure level of the noise reduction signal. Even with this, substantially the same advantageous effects are obtainable.
  • the identification signal used in the identification operation during noise control has a frequency of low sensitivity in human hearing characteristics (e.g., 5 Hz or more, 1 kHz). Accordingly, the discomfort to humans existing in a noise reduction region caused by the identification signal can be suppressed.
  • the identification signal whose emission period is 0.5 or less seconds is emitted at intervals of approximately 3 seconds. Accordingly, the effects on the human perception by the identification signal can be suppressed.
  • the noise control apparatus according to the present invention is applied to a closed space that is an air-conditioning apparatus including a duct.
  • the noise control apparatus according to the present invention is also applicable to an open space, and also in this case, substantially the same advantageous effects are obtainable.
  • noise emitted from a rotational mechanism such as a fan or motor
  • the present invention is also applicable to noise control for noise emitted from a moving mechanism, such as a car or machine tool, and also in this case, substantially the same advantageous effects are obtainable.

Landscapes

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

Claims (4)

  1. Appareil de contrôle de bruit (100) comprenant :
    un ou plusieurs capteurs de référence (2) configurés pour détecter un signal de bruit produit par une source de bruit ;
    une ou plusieurs sources d'émission de son (3) configurées pour émettre un signal de réduction de bruit et un signal d'identification ;
    un capteur d'erreur (4) configuré pour détecter une composante de signal acoustique ;
    un moyen d'identification configuré pour effectuer une opération d'identification pour identifier une propriété acoustique dans une région de réduction de bruit sur la base du signal d'identification détecté par le capteur d'erreur (4) ; et
    un moyens de génération de signal de réduction de bruit configuré pour générer le signal de réduction de bruit par un traitement de signal adaptatif sur la base de la détection par au moins l'un des capteurs de référence (2) et de la détection par le capteur d'erreur (4),
    dans lequel le moyen d'identification est configuré pour effectuer l'opération d'identification pour acquérir un changement de la propriété acoustique dans la région de réduction de bruit sur la base d'une comparaison entre une caractéristique fréquentielle d'un signal détecté par le capteur d'erreur (4) alors qu'au moins l'une des sources d'émission de son (3) émet le signal d'identification et n'émet pas le signal de réduction de bruit et une caractéristique fréquentielle d'un signal détecté par le capteur d'erreur (4) alors qu'au moins l'une des sources d'émission de son (3) émet un signal superposé du signal de réduction de bruit et du signal d'identification ;
    dans lequel le moyen de génération de signal de réduction de bruit est configuré pour générer le signal de réduction de bruit en outre sur la base du changement de la propriété acoustique dans la région de réduction de bruit,
    dans lequel le signal d'identification est un signal impulsionnel, et
    caractérisé en ce que :
    le moyen d'identification est configuré de sorte qu'une période d'opération de l'opération d'identification soit entre une minute et cinq minutes incluses, et
    dans l'opération d'identification,
    la source d'émission de son est configurée pour émettre le signal impulsionnel pendant une période d'émission de 0,5 secondes ou moins et répéter l'émission à des intervalles de 3 secondes.
  2. Appareil de contrôle de bruit (100) selon la revendication 1, dans lequel les sources d'émission de son (3) sont configurées pour émettre le signal impulsionnel de sorte que
    un niveau de pression sonore du signal impulsionnel soit inférieur à un niveau de pression sonore du signal de réduction de bruit émis à partir d'au moins l'une des sources d'émission de son (3) de 3 dB ou plus, ou
    une composante d'énergie du signal impulsionnel ait un niveau qui est égal à la moitié de celui d'une composante d'énergie du signal de réduction de bruit émis à partir de ladite au moins une des sources d'émission de son (3).
  3. Appareil de contrôle de bruit (100) selon l'une quelconque de la revendication 1 et de la revendication 2, dans lequel une composante de signal du signal impulsionnel comprend une composante de fréquence entre 5 Hz et 1 kHz inclus.
  4. Procédé de contrôle de bruit comprenant les étapes :
    de sortie d'un signal de réduction de bruit annulant le bruit dans une région de réduction de bruit qui est une cible pour la réduction de bruit ;
    de sortie d'un signal impulsionnel en tant que signal d'identification pour une utilisation lors de l'identification d'une propriété acoustique dans la région de réduction de bruit ;
    de sortie du signal de réduction de bruit et du signal d'identification d'une telle manière telle qu'ils soient superposés ;
    d'acquisition d'un changement de la propriété acoustique dans la région de réduction de bruit sur la base d'une comparaison entre une caractéristique fréquentielle d'un signal acoustique détecté de la région de réduction de bruit alors que le signal d'identification est sorti et que le signal de réduction de bruit n'est pas sorti et une caractéristique fréquentielle d'un signal acoustique détecté de la région de réduction de bruit alors qu'un signal superposé du signal d'identification et du signal de réduction de bruit est sorti ; et
    de génération du signal de réduction de bruit sur la base du changement de la propriété acoustique dans la région de réduction de bruit ;
    caractérisé en ce que :
    ladite sortie d'un signal impulsionnel en tant que signal d'identification est effectuée pendant une période d'opération, dans lequel la période d'opération est entre une minute et cinq minutes incluses, et dans la période d'opération, le signal d'identification est sorti pendant une période d'émission de 0,5 secondes ou moins et l'émission est répétée à des intervalles de 3 secondes.
EP09849773.8A 2009-09-24 2009-09-24 Dispositif de contrôle du bruit et procédé de contrôle du bruit Active EP2472510B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/066506 WO2011036742A1 (fr) 2009-09-24 2009-09-24 Dispositif de lutte contre le bruit et procédé de lutte contre le bruit

Publications (3)

Publication Number Publication Date
EP2472510A1 EP2472510A1 (fr) 2012-07-04
EP2472510A4 EP2472510A4 (fr) 2016-12-21
EP2472510B1 true EP2472510B1 (fr) 2019-10-23

Family

ID=43795513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09849773.8A Active EP2472510B1 (fr) 2009-09-24 2009-09-24 Dispositif de contrôle du bruit et procédé de contrôle du bruit

Country Status (3)

Country Link
EP (1) EP2472510B1 (fr)
JP (1) JP5474079B2 (fr)
WO (1) WO2011036742A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6317863B2 (ja) * 2014-01-17 2018-04-25 株式会社熊谷組 騒音マスキング装置
JP2016061868A (ja) * 2014-09-17 2016-04-25 ソニー株式会社 騒音抑制装置および騒音抑制方法、並びにプログラム
CN104864562B (zh) * 2015-05-06 2018-09-25 海信（广东）空调有限公司 噪音控制方法和装置、家用电器及中央控制器
CN107564509B (zh) * 2017-10-23 2022-08-19 上海联影医疗科技股份有限公司 降噪系统
CN111536681B (zh) * 2020-04-24 2021-11-05 青岛海信日立空调系统有限公司 空调器及主动降噪调试方法
CN111536587A (zh) * 2020-04-24 2020-08-14 青岛海信日立空调系统有限公司 空调器

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4677676A (en) * 1986-02-11 1987-06-30 Nelson Industries, Inc. Active attenuation system with on-line modeling of speaker, error path and feedback pack
JP2882170B2 (ja) * 1992-03-19 1999-04-12 日産自動車株式会社 能動型騒音制御装置
JP2856625B2 (ja) * 1993-03-17 1999-02-10 株式会社東芝 適応形能動消音装置
JP3489137B2 (ja) * 1993-07-20 2004-01-19 日産自動車株式会社 能動型騒音制御装置
JP3419911B2 (ja) * 1994-10-28 2003-06-23 アルパイン株式会社 騒音キャンセルシステム
JP3725959B2 (ja) * 1997-03-14 2005-12-14 ティーオーエー株式会社 伝達関数同定装置及び能動型雑音除去装置
JP4078368B2 (ja) 2005-09-14 2008-04-23 キヤノン株式会社 消音装置及び画像形成装置
JP4857897B2 (ja) 2006-05-12 2012-01-18 日産自動車株式会社 騒音制御方法および騒音制御装置
JP4252074B2 (ja) * 2006-07-03 2009-04-08 政明 大熊 アクティブ消音装置におけるオンライン同定時の信号処理方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2472510A4 (fr) 2016-12-21
JP5474079B2 (ja) 2014-04-16
WO2011036742A1 (fr) 2011-03-31
JPWO2011036742A1 (ja) 2013-02-14
EP2472510A1 (fr) 2012-07-04

Similar Documents

Publication Publication Date Title
US6418227B1 (en) Active noise control system and method for on-line feedback path modeling
US9706296B2 (en) Apparatus and method for improving the perceived quality of sound reproduction by combining active noise cancellation and a perceptual noise compensation
US5940519A (en) Active noise control system and method for on-line feedback path modeling and on-line secondary path modeling
EP2472510B1 (fr) Dispositif de contrôle du bruit et procédé de contrôle du bruit
JP7421489B2 (ja) 能動雑音制御方法およびシステム
Das et al. Nonlinear active noise control for headrest using virtual microphone control
US6198828B1 (en) Off-line feedback path modeling circuitry and method for off-line feedback path modeling
JPH06272684A (ja) 適応形能動消音装置
Munir et al. Psychoacoustically motivated active noise control at remote locations
JP2923476B2 (ja) 適応型能動的消音装置
KR100748425B1 (ko) 능동소음 제어장치 및 방법
KR101283105B1 (ko) 능동잡음 제어장치 및 그 방법
JPH0336897A (ja) 電子消音システム
JP5646806B2 (ja) 能動騒音制御装置及び能動騒音制御方法
JP2791510B2 (ja) アクティブ消音装置
JPH06318083A (ja) アクティブ消音装置
JPH10254459A (ja) 伝達関数同定装置及び能動型雑音除去装置
Zhou Study of the nonlocal active sound control with preservation of desired field
Zhaohan A Low-cost and Portable Active Noise Control Unit
JPH06138883A (ja) 消音装置
González et al. DEVELOPMENT AND IMPLEMENTATION OF AN ADAPTIVE NARROWBAND ACTIVE NOISE CONTROLLER
JP2001282253A (ja) 能動型消音装置
JPH06332468A (ja) アクティブ消音装置
JPH07334168A (ja) 能動騒音制御システム
JP2003186478A (ja) 騒音制御装置及び騒音制御方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20120309

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
RA4 Supplementary search report drawn up and despatched (corrected)

Effective date: 20161118

RIC1 Information provided on ipc code assigned before grant

Ipc: G10K 11/178 20060101AFI20161114BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20180329

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20190430

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602009060255

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1194555

Country of ref document: AT

Kind code of ref document: T

Effective date: 20191115

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20191023

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200124

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200123

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200123

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200224

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200224

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602009060255

Country of ref document: DE

PG2D Information on lapse in contracting state deleted

Ref country code: IS

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200223

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1194555

Country of ref document: AT

Kind code of ref document: T

Effective date: 20191023

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

26N No opposition filed

Effective date: 20200724

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20200930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200924

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200924

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200930

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200930

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20191023

REG Reference to a national code

Ref country code: DE

Ref legal event code: R084

Ref document number: 602009060255

Country of ref document: DE

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230512

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20230803

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20230808

Year of fee payment: 15

Ref country code: DE

Payment date: 20230802

Year of fee payment: 15