EP4133476B1 - Procédé, dispositif, casque d'écoute et programme informatique pour supprimer activement un bruit d'interférence - Google Patents

Procédé, dispositif, casque d'écoute et programme informatique pour supprimer activement un bruit d'interférence Download PDF

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Publication number
EP4133476B1
EP4133476B1 EP21717392.1A EP21717392A EP4133476B1 EP 4133476 B1 EP4133476 B1 EP 4133476B1 EP 21717392 A EP21717392 A EP 21717392A EP 4133476 B1 EP4133476 B1 EP 4133476B1
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Prior art keywords
transfer function
path
primary path
headphones
primary
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German (de)
English (en)
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EP4133476A1 (fr
EP4133476C0 (fr
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Johannes Fabry
Peter Jax
Stefan Liebich
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Rheinisch Westlische Technische Hochschuke RWTH
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Rheinisch Westlische Technische Hochschuke RWTH
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    • 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
    • G10K11/17815—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 reference signals and the error signals, i.e. primary 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
    • G10K11/1781—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
    • 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
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/01—Hearing devices using active noise cancellation

Definitions

  • the present invention relates to a method for active noise suppression.
  • the present invention further relates to a device for carrying out the method.
  • the invention further relates to headphones which are designed to carry out a method according to the invention or have a device according to the invention and to a computer program with instructions which cause a computer to carry out the steps of the method.
  • ANC active noise cancellation
  • An additional sound signal is artificially generated that corresponds as closely as possible to the disturbing sound, but with opposite polarity, in order to then cancel out the noise as much as possible by superimposing the two sound signals using destructive interference.
  • headphones with active noise cancellation are measured using one or more microphones integrated in the headphones and then the proportion that would still remain in the ear is calculated using the acoustic transfer function of the headphones.
  • the opposite polarity signal is then generated in the headphones and output via a loudspeaker, which is also used to reproduce the useful sound.
  • Modern ANC headphones usually use fixed feedforward and feedback filters for this purpose, enabling attenuation of up to 30 dB at low frequencies, but the filter performance depends sensitively on the fit of the headphones and the shape of the user's ear.
  • adaptive algorithms can also be considered to improve the degree of noise suppression.
  • such adaptive algorithms require high computing power and are therefore currently unsuitable for use in headphones, hearables or hearing aids.
  • ANC headphones are equipped with a built-in speaker and two microphones.
  • One of the microphones is directed towards the headphone environment to measure a reference signal in the form of ambient noise and is often referred to as the reference microphone.
  • the other microphone is directed towards the user's ear canal or eardrum to detect an internal error signal and is also referred to as the error microphone.
  • the acoustic transmission from the external reference microphone to the internal error microphone is called the primary path
  • the transmission from the speaker to the error microphone is called the secondary path.
  • the secondary path can be measured using the loudspeaker and the internal microphone, whereby the signal-to-noise ratio at the internal microphone is quite high due to the passive isolation of the headphones.
  • Measuring the primary path requires an additional external loudspeaker setup and a suitable measurement environment and is therefore complex and not easy for end users to carry out.
  • the invention makes use of the knowledge that, particularly in the case of in-ear headphones, but also in the case of headphones with other designs, there can be a considerable correlation between the frequency spectra of primary and secondary paths and that this can be exploited in order to achieve an optimization of the noise suppression even without measuring the primary path.
  • a transfer function for a secondary path between a loudspeaker and an error microphone is measured. Based on the measured transfer function for the secondary path, a transfer function for a primary path between a reference microphone and the error microphone is estimated. Then, based on the estimated transfer function for the primary path, filter coefficients for filtering to generate the cancellation signal are determined.
  • At least one reference microphone detects noise signals
  • a loudspeaker outputs a cancellation signal
  • an error microphone detects the remaining residual signal after the cancellation signal is superimposed on the noise signal.
  • the active noise suppression is carried out during the reproduction of a useful audio signal by means of a headphone, wherein one or more reference microphones are located on the outside of the headphone and the error microphone is located on the inside of the headphone.
  • the transfer function for the secondary path is individually measured for a user and an individual transfer function for the primary path is estimated for the user based on the individually measured transfer function for the secondary path.
  • the filtering is carried out using a forward-facing FIR filter or IIR filter.
  • an estimation function for the primary path is determined by measuring and analyzing both the transfer function for the secondary path and the transfer function for the primary path in advance in a training process for different persons and/or fits of the headphones.
  • the digital filter is designed as an FIR filter or IIR filter.
  • the invention also relates to a headset which is configured to carry out the method according to the invention or has a device according to the invention, as well as to a computer program with instructions which cause a computer to carry out the steps of the method according to the invention.
  • the method according to the invention can be used in particular for active noise suppression in in-ear headphones, as in Figure 1 shown schematically.
  • the in-ear headphones 10 are placed on the ear of a user, with an ear insert 14 of the in-ear headphones being inserted into the external auditory canal 15 to hold it in place.
  • the ear insert can partially shield external noise, depending on the individual fit in the auditory canal, so that these Noise then only reaches the user’s eardrum 16 at a reduced level.
  • An interference signal x(t) arriving at the headphones from the environment is recorded by a reference microphone 11 that is directed away from the ear canal.
  • the in-ear headphones 10 also have an error microphone 12 that is directed towards the ear canal 15 and a loudspeaker 13 that is located near the error microphone 12.
  • a cancellation signal ⁇ (t) can be output by means of the loudspeaker 13.
  • the error microphone 12 records the remaining residual signal e(t) after the cancellation signal ⁇ (t) has been superimposed on the interference signal x(t).
  • the acoustic primary path P a (s) describes the transfer function from the reference microphone 11 to the error microphone 12, while the acoustic secondary path S a (s) describes the transfer function from the loudspeaker 13 to the error microphone 12.
  • the in-ear headphones shown have only one reference microphone, but several reference microphones can also be used, each of which has a separate primary path
  • Figure 2 shows a schematic of the basic concept for a method for active noise suppression, as can be carried out, for example, with such in-ear headphones.
  • a transfer function for a secondary path between the loudspeaker and the error microphone is measured.
  • a transfer function for a primary path between the reference microphone and the error microphone is then estimated based on the measured transfer function for the secondary path. For this purpose, the relationships between the primary path and secondary path for the headphones in question, determined in a training phase described below, are used.
  • the estimated transfer function then allows filter coefficients for a filter for generating the cancellation signal to be determined in a further step 22. In this way, the filter can be adjusted so that the output cancellation signal enables the best possible compensation of the interference signal.
  • the filter After determining the filter coefficients by measuring the secondary path and then estimating the primary path, the filter can then be used unchanged until further notice in order to prevent or at least reduce the impairment of the user's perception by interference when playing back an audio signal using the in-ear headphones.
  • the interference suppression can also be used by the user without playing back a signal.
  • the audio signal can be perceived as more pleasant, for example when travelling by train or plane, which reduces the volume level.
  • Figure 3 shows a block diagram of a device according to the invention.
  • the analog unit 30 is connected to the hardware components of Figure 1 is extended by an electronic backend which is connected to the microphones 11, 12 via analog-digital converters 31, 32 and to the loudspeaker 13 via the digital-analog converter 33.
  • the electronic backend comprises a digital filter unit 34 and a processor unit 35.
  • the device according to the invention can be fully integrated into an ANC headset or can also be a partial component of an external device, such as a smartphone.
  • the processor unit 35 can be part of such an external device.
  • the processor unit 35 has one or more digital signal processors, but can also contain other types of processors or combinations thereof.
  • the digital filter 34 is designed as a time-invariant FIR forward filter ⁇ (z), which receives the digitally converted interference signal x(n) and generates the cancellation signal ⁇ (n).
  • the digital filter 34 can also be designed as an IIR filter, usually as a biquad filter.
  • the digital signal processor 35 generates a measurement signal m(n) and evaluates the digitized error signal e(n) in order to measure the secondary path.
  • the filter coefficients of the digital filter ⁇ (z) are also adapted by the digital signal processor.
  • instructions are stored in a memory (not shown), which is preferably integrated in the processor unit, which cause the device to carry out the steps according to the method according to the invention when executed by the processor unit.
  • the overall transfer function H(s) describes the transfer function from the reference microphone 11 to the error microphone 12 and, in contrast to the primary path, includes the influence of the ANC system.
  • the primary path P(z) and the secondary path S(z) contain the influence of the analog-digital converter and the digital-analog converter, the loudspeaker and the microphones.
  • H z P z ⁇ W ⁇ z S z .
  • s and z denote the complex frequency parameters of the Laplace and z-transforms, respectively, and n denotes a discrete time index.
  • the first K p , K s principal components U p , k , U s , k ⁇ C L , as well as the means of a set of windowed complex frequency domain vectors of the primary path and secondary path are extracted from the set T.
  • PCA principal component analysis
  • the complex gain vectors g p,j and g s , j minimize the Euclidean distance between the reconstructed frequency domain vectors based on the principal components and the frequency domain vectors of the primary path and secondary path.
  • a linear mapping is then a ⁇ ⁇ C K p ⁇ K s which projects the gain vectors g p,j of the primary path onto the gain vectors of the secondary path g s , j .
  • the window function Q s (z) is applied to the measured secondary path in the z-domain and then the gain vector g s , j for the secondary path is calculated using the principal components and the mean of the secondary path. Then, the gain vector g p,j for the primary path is estimated using the linear map â , followed by an estimate of the primary path based on the principal components and the mean of the primary path and the estimated gain vector g p,j for the primary path. Finally, by replacing p with the estimate of the individual primary path the individual forward filter.
  • the effectiveness of the proposed estimator was verified with simulations, the results of which are presented below.
  • measurements were carried out for 25 subjects and different fits on an in-ear headphone, using a sampling rate of 48 kHz.
  • Figure 4 shows the spectra of the measured primary paths (a) and secondary paths (b).
  • the shaded frequency range 40 indicates the range of the selected frequency range windows.
  • the set of measured primary and secondary paths was randomly divided into two subsets, with a training set containing 80% and a validation set containing the other 20% of the set of measured paths. The training set was used to train the estimator as described above.
  • the performance of the estimator was then checked by testing the overall transfer path.
  • h j p j 0 ⁇ s j w ⁇ validated by repeating the measurement 100 times for randomly divided subsets.
  • Figure 5 shows the measured magnitude spectra
  • the median 51 of the primary path
  • Figure 6 shows the median of the primary path
  • H avg ( z ) is based on the mean of the primary paths of the training set
  • H est ( z ) is based on a primary path estimate, as is H ppg ( z ) but using a perfect PCA gain vector (PPG) g p instead of its estimate
  • H opt ( z ) is based on the actual primary path.
  • > 0 marks the frequency range where H ( z ) is influenced by the primary path estimator. From the figure, it can be seen that the median of the spectrum
  • the box plot in Figure 7 shows the energy ratio in dB for the different primary path estimates from Figure 6 (a) mean, b) estimate, c) estimate with PPG, d) optimum with knowledge of the actual primary path).
  • the median as well as the minimum, the so-called lower whisker, and the maximum, the so-called upper whisker, are shown as horizontal lines and the lower quartile and upper quartile are shown as rectangles surrounding the median.
  • the energy ratio ⁇ is reduced by 3.1 dB when using the median estimator (b) compared to using the mean value (a), while the difference between the maximum values, the so-called upper whiskers, is 5.0 dB.
  • Figure 8 shows schematically the use of a headphone 10, such as a so-called hearable, in connection with an external computer device 80.
  • the external computer device 80 can in particular be a mobile terminal that is suitable for audio playback.
  • a smartphone a so-called wearable, such as a smartwatch, a fitness bracelet or data glasses, or a computer tablet can be connected to the headphone.
  • the devices communicate wirelessly via a radio connection such as Bluetooth. After the connection has been established, audio signals can be transmitted from the external computer device 80 to the headphones 10 and then reproduced in the conventional manner using one or more loudspeakers integrated into the headphones.
  • a radio connection such as Bluetooth.
  • the active noise suppression according to the invention can also be carried out by means of the external computer device 80.
  • the external computer device 80 can transmit a measurement signal to the headphones, in particular when a user uses the headphones 10 for the first time, which is then output by a loudspeaker integrated in the headphones.
  • a The error microphone then records the error signal, which is transmitted to the external computer device 80.
  • the external computer device 80 calculates the secondary path, estimates the primary path and then determines the filter coefficients for the filter to generate the cancellation signal.
  • the filter coefficients are then sent via the wireless connection from the external computer device 80 to the headphones 10, in which the filter is adjusted accordingly so that interference noise is suppressed as far as possible when the audio signals are played back.

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

Claims (11)

  1. Procédé de réduction active des bruits parasites dans un casque (10), dans lequel
    - une fonction de transfert pour un chemin secondaire entre un haut-parleur et un microphone d'erreur est mesurée (20) ;
    - sur la base de la fonction de transfert mesurée pour le chemin secondaire, une fonction de transfert pour un chemin primaire entre un microphone de référence et le microphone d'erreur est estimée (21) avec un estimateur pour le chemin primaire, l'estimateur pour le chemin primaire ayant été déterminé en mesurant et en analysant à l'avance aussi bien la fonction de transfert pour le chemin secondaire que la fonction de transfert pour le chemin primaire dans un processus de formation ; et
    - sur la base de la fonction de transfert estimée pour le chemin primaire, des coefficients de filtrage sont déterminés (22) pour un filtrage destiné à générer un signal d'effacement.
  2. Procédé selon la revendication 1, dans lequel au moins un microphone de référence (11) détecte des signaux sonores parasites, un haut-parleur (13) émet un signal d'effacement et un microphone d'erreur (12) détecte le signal résiduel après une superposition du signal d'effacement avec le signal sonore parasite.
  3. Procédé selon la revendication 2, dans lequel la réduction active des bruits parasites est effectuée lors de la reproduction d'un signal audio utile au moyen d'un casque (10), un ou plusieurs microphones de référence (11) étant situés à l'extérieur du casque et le microphone d'erreur (12) étant situé à l'intérieur du casque.
  4. Procédé selon l'une des revendications précédentes, dans lequel
    - -la fonction de transfert pour le chemin secondaire est mesurée individuellement pour un utilisateur ;
    - une fonction de transfert individuelle pour le chemin primaire est estimée sur la base de la fonction de transfert mesurée individuellement pour le chemin secondaire pour l'utilisateur.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel le filtrage est effectué au moyen d'un filtre FIR ou d'un filtre IIR (35) dirigé vers l'avant.
  6. Procédé selon l'une des revendications 3 à 5, dans lequel l'estimateur pour le chemin primaire est déterminé en mesurant et en analysant à l'avance aussi bien la fonction de transfert pour le chemin secondaire que la fonction de transfert pour le chemin primaire, dans un processus de formation pour différentes personnes et/ou différents ajustements du casque.
  7. Procédé selon la revendication 6, dans lequel
    - une analyse en composantes principales suivie d'une réduction dimensionnelle des valeurs mesurées obtenues dans le processus d'apprentissage est effectuée pour les valeurs mesurées dans les plages de fréquence des fonctions de transfert, pour lesquelles il existe des variations déterministes pour le chemin primaire et le chemin secondaire ;
    - des vecteurs de gain complexes sont déterminés pour les chemins primaires et les chemins secondaires sur la base des composantes principales et des valeurs moyennes obtenues par l'analyse des composantes principales ; et
    - une carte linéaire qui minimise l'erreur entre les vecteurs de gain déterminés et les vecteurs de gain estimés des voies primaires est déterminée.
  8. Dispositif de réduction active des bruits parasites dans un casque (10), comprenant
    - au moins un microphone de référence (11) ;
    - un haut-parleur (13) ;
    - un microphone d'erreur (12) ;
    - un filtre numérique (34) destiné à générer un signal d'effacement;
    - un processeur de signaux numériques (35) qui est conçu pour
    - générer un signal de mesure pouvant être émis par le haut-parleur et évaluer un signal détecté par le microphone d'erreur, de manière à mesurer une fonction de transfert pour un chemin secondaire entre le haut-parleur et le microphone d'erreur ;
    - estimer, sur la base de la fonction de transfert mesurée pour le chemin secondaire, une fonction de transfert pour un chemin primaire entre le microphone de référence et le microphone d'erreur (21) avec un estimateur pour le chemin primaire, l'estimateur pour le chemin primaire ayant été déterminé en mesurant et en analysant à l'avance aussi bien la fonction de transfert pour le chemin secondaire que la fonction de transfert pour le chemin primaire dans un processus de formation ; et
    - adapter des coefficients de filtrage pour le filtre numérique sur la base de la fonction de transfert estimée pour le chemin primaire.
  9. Dispositif selon la revendication 8, dans lequel le filtre numérique (34) est configuré comme un filtre FIR ou IIR dirigé vers l'avant.
  10. Casque (10) conçu pour mettre en œuvre un procédé selon l'une des revendications 1 à 7 ou comprenant un dispositif selon la revendication 8 ou 9.
  11. Programme d'ordinateur comprenant des instructions permettant à un ordinateur d'exécuter les étapes d'un procédé selon l'une des revendications 1 à 7.
EP21717392.1A 2020-04-07 2021-04-06 Procédé, dispositif, casque d'écoute et programme informatique pour supprimer activement un bruit d'interférence Active EP4133476B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020109658.5A DE102020109658A1 (de) 2020-04-07 2020-04-07 Verfahren, Vorrichtung, Kopfhörer und Computerprogramm zur aktiven Störgeräuschunterdrückung
PCT/EP2021/058855 WO2021204754A1 (fr) 2020-04-07 2021-04-06 Procédé, dispositif, casque d'écoute et programme informatique pour supprimer activement un bruit d'interférence

Publications (3)

Publication Number Publication Date
EP4133476A1 EP4133476A1 (fr) 2023-02-15
EP4133476C0 EP4133476C0 (fr) 2025-02-26
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JP2023046090A (ja) * 2021-09-22 2023-04-03 富士フイルムビジネスイノベーション株式会社 情報処理装置、情報処理システム、およびプログラム
CN114339513B (zh) * 2021-10-21 2024-12-17 深圳市中科蓝讯科技股份有限公司 主动降噪滤波器的生成方法、存储介质及耳机
CN114582311A (zh) * 2022-01-14 2022-06-03 西安理工大学 主动降噪睡枕及其降噪方法
CN115831140B (zh) * 2022-11-08 2025-10-03 爱听智能科技(深圳)有限公司 啸叫抑制方法、装置、设备及介质
CN115942177A (zh) * 2022-11-25 2023-04-07 杭州国芯科技股份有限公司 一种实现耳机通透模式的方法

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US20230154449A1 (en) 2023-05-18
WO2021204754A1 (fr) 2021-10-14
EP4133476A1 (fr) 2023-02-15
DE102020109658A1 (de) 2021-10-07
EP4133476C0 (fr) 2025-02-26
CN115298735B (zh) 2026-01-23
US12125466B2 (en) 2024-10-22
CN115298735A (zh) 2022-11-04

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