EP2684188B1 - Système de réglage pour une suppression active du bruit ainsi que procédé de suppression active du bruit - Google Patents

Système de réglage pour une suppression active du bruit ainsi que procédé de suppression active du bruit Download PDF

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Publication number
EP2684188B1
EP2684188B1 EP12701505.5A EP12701505A EP2684188B1 EP 2684188 B1 EP2684188 B1 EP 2684188B1 EP 12701505 A EP12701505 A EP 12701505A EP 2684188 B1 EP2684188 B1 EP 2684188B1
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EP
European Patent Office
Prior art keywords
control
loudspeaker
noise
closed loop
acoustic ratio
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Active
Application number
EP12701505.5A
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German (de)
English (en)
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EP2684188B8 (fr
EP2684188A2 (fr
Inventor
Martin Schoerkmaier
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Ams Osram AG
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Ams AG
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Publication of EP2684188B1 publication Critical patent/EP2684188B1/fr
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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
    • 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
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
    • 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
    • G10K11/1787—General system configurations
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • 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
    • 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
    • G10K2210/3026—Feedback
    • 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
    • G10K2210/3055—Transfer function of the acoustic system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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 control system for active noise suppression, in particular for a mobile telephone, and to a method for active noise suppression.
  • FIG. 10 This shows similar to the FIG. 10 a so-called forward control.
  • a feedforward control the noise is picked up in a path 2 via a microphone, and processed in a control network with filter 4 to output via a loudspeaker.
  • the processing takes place in such a way that the noise is inverted with regard to its phase in a frequency range.
  • the inverted signal thus output from the loudspeaker interferes with the sounds coming to the ear above the path 1 to cause the suppression of unwanted noise.
  • FIG. 11 shows such an example in which a microphone, which is part of a backward control, is mounted near a loudspeaker and receives the signal in the path 2.
  • the loudspeaker also ideally reproduces a microphone signal which has been phase-rotated by 180 °, which with respect to its amplitude is adapted to the interference noise incident on the path 1.
  • the document EP 1921602 A2 shows a digital system for active noise cancellation with an external microphone for a feedforward control and an internal microphone for a reverse control, which is placed in the vicinity of a speaker of the system. Compensation signals of both the feed forward control and the feed back control are provided to the loudspeaker.
  • the feedforward control is tuned to a high bandwidth, while the feedforward control is tuned to a narrower bandwidth.
  • a forward and a reverse control which are both tuned to different acoustic conditions.
  • the two regulations are coupled to one another in such a way that at least one regulation compensates the other regulation with a corresponding change in the acoustic conditions.
  • the two regulations are tuned to one extreme of the possible acoustic conditions.
  • the backward control is therefore tuned to provide good noise cancellation over the frequency range with a tight termination and a fixed predetermined volume of air.
  • the forward control is tuned to a different acoustic ratio, which corresponds, for example, a completely leaky closure of the speaker with the user's ear.
  • control system according to the invention can thus be used in particular for the mobile radio sector, in which the acoustic conditions depend in particular on user behavior.
  • a control system comprises a loudspeaker and an adder to which the loudspeaker is connected.
  • the adder has a first and a second input.
  • the control system further includes a feedforward control with a first microphone for receiving noise and a connected thereto control network with at least one filter to form a first controlled variable.
  • On the output side is the first one Control network coupled to the adder for supplying the first controlled variable.
  • the control system further comprises a reverse control with a second microphone for receiving a sound emitted by the loudspeaker.
  • a second control network with at least one filter implemented in the reverse control serves to form a second controlled variable and is coupled on the input side to the second microphone.
  • the second control network is also connected to the adder.
  • the backward control is tuned for noise suppression based on a first, in particular a predetermined, fixed, acoustic ratio.
  • the forward control is tuned for a noise suppression, which is based on a second, in particular a non-fixed, acoustic ratio, in particular on an open ratio.
  • the adder for adding the two control variables it is possible to compensate for the first control variable at least partially, if changing current acoustic conditions in the direction of the first acoustic ratio.
  • the first acoustic ratio in one embodiment corresponds to a substantially tight closure of the loudspeaker with an ear of a user.
  • the first acoustic ratio includes a substantially fixed volume of air, thereby facilitating tunability.
  • the second acoustic ratio corresponds to a leaking termination of the loudspeaker with an ear of a user. The thus existing between the speaker and the user's ear air column is at second, non-fixed acoustic ratio in contrast to the first, fixed acoustic ratio variable at least but significantly greater than the volume of air at the first, fixed acoustic ratio.
  • the first, fixed acoustic ratio also corresponds to a first distance between the loudspeaker and the eardrum of a user while the second, non-fixed acoustic ratio corresponds to a second distance and a second direction between the user's loudspeaker and ear.
  • the second distance is greater than the first distance.
  • the first acoustic ratio corresponds to a first extreme value of possible acoustic conditions and the second acoustic ratio corresponds to a second extreme value of the possible acoustic conditions.
  • the tuning of the feedforward control and the reverse control is invariable, at least during operation of the control system.
  • the first and second control networks are based on a completely analog control.
  • the first and / or the second control network has a control behavior coordinated with the respective acoustic ratio, in particular a coordinated control gain.
  • control system comprises a loudspeaker housing for receiving the loudspeaker, which essentially encloses a first volume of air.
  • An additional housing with a substantially second volume of air is arranged in a preferred direction for sound radiation of the loudspeaker housing.
  • the fixed acoustic ratio is given by the first and second air volumes.
  • the second microphone may be arranged in the additional housing, which forms part of the backward regulation.
  • the second control network may thus be tuned to a noise suppression based on the first and second air volumes.
  • the first control network is tuned to a noise suppression based on an air volume which is significantly larger than the first and second air volumes.
  • backward control and forward control for noise suppression are provided.
  • the backward control is adjusted to a first acoustic ratio, the forward control to a second acoustic ratio.
  • a control variable of the feedforward control is compensated by a controlled variable of the reverse control, if actual acoustic conditions change in the direction of the first acoustic ratio.
  • the second and the first acoustic ratio may be predetermined by corresponding distances between the loudspeaker or a reference point and the ear of a user. In a change in the distance, for example, a reduction thus takes place a compensation of a Control gain of the feedforward control by the control gain of the feedback control.
  • FIG. 1 shows a first embodiment of the inventive principle.
  • the control system shown is part of a mobile device or a headset and comprises a loudspeaker housing 700 shown schematically here.
  • the loudspeaker housing 700 may be designed in the form of a headphone housing with a padding 701.
  • other housing for the speaker 300 are conceivable that can be held on the ear of a user.
  • Ear clips with corresponding ear mounts that are inserted into the ear of a user also form possible speaker housing 700.
  • These housings have in common that they ensure depending on their design a more or less tight closure to the ear of a user.
  • the term "tight conclusion" and its meaning will be explained in more detail below.
  • control system also includes a microphone 200 in the vicinity of the speaker.
  • the microphone 200 is part of a feedback control from the control network 400 and the adder 600.
  • the control network 400 is connected to an input of the adder 600.
  • a second input of the adder 600 is connected to a second control network 500.
  • the second control network 500 forms part of a feedforward control and is connected on the input side to the microphone 100.
  • the forward control microphone 100 is mounted on the outside of the speaker cabinet 700 while the backward control microphone 200 is mounted near the speaker 300.
  • the microphone 200 thus detects the signal output from the speaker and supplies it to the feedback control and the control network 400.
  • the feedforward function works such that the microphone 100 picks up external noise that also passes through the speaker housing to a user's ear.
  • the recorded interference signal is fed to the control network 500, which performs phase and amplitude compensation. This is done so that the recorded signal is rotated over a relatively wide frequency range to the original noise with respect to its phase position by 180 °.
  • This now inverted noise signal is additionally amplified in the control network 500 and then supplied to the speaker. In an inverse phase position and a corresponding same amplitude to the original noise signal occurs at the ear of a user to a destructive interference and thus to a suppression of the noise signal.
  • the backward control corresponds to a so-called open loop in which the amplitude and phase of the output loudspeaker signal are measured.
  • the inverse of the filter transfer function calculated from this corresponds to the ideal filter of the control network. Because of the dead time between the output speaker signal and the microphone is often not complete phase inversion, so that the one control gain to high frequencies must be weakened to ensure the stability of the system.
  • the backward control in this way also detects the first control signal of the feedforward control as a disturbance variable and can compensate for this under certain circumstances.
  • the adder 600 compensates by the backward control not only of noise that couple through the housing 700 in the microphone 200, but also a compensation of the controlled variable of the feedforward control and thus the control network 500, which is discharged through the speaker 300.
  • the backward control and the feedforward control are tuned to different acoustic conditions.
  • the backward control operates optimally at a predetermined acoustic ratio at which the feedforward control substantially no longer works, or at least significantly less.
  • the feedforward control is optimally tuned to a second acoustic ratio and results in this to a good noise suppression.
  • the backward control no longer functions sufficiently, so that the noise suppression in the second acoustic ratio only determines the first controlled variable of the feedforward control.
  • An acoustic ratio is essentially the influence of external parameters on the noise suppression.
  • the acoustic ratio and in particular the quality of a noise suppression especially of the tightness or the stability of an air volume between the speaker and the eardrum of a user dependent.
  • a "tight seal” stable acoustic conditions are present, for example, the speaker housing is arranged around the ear or on the ear of a user, so that no exchange of air between an outer volume and the volume of air in the housing and the ear of a user takes place.
  • a "close seal” is given, for example, in headphones whose earpieces have a predetermined shape and snuggle tightly around the ear of a user.
  • the first path 1 couples via the loudspeaker housing and the ear into the air volume located between the loudspeaker housing and the ear and thus reaches the eardrum of a user.
  • the second path 2 of the noise is passed directly to the microphone 100 of the feed forward control. It is processed there in the control network 500 of the forward control and fed to the adder 600.
  • the adder 600 outputs this signal as a first controlled variable to the loudspeaker 300.
  • the loudspeaker 300 radiates the noise signal into a predetermined and fixed but at the same time stable air volume, which is ensured by the tight closure to the ear.
  • the microphone 100 of the feedback control now takes the output from the speaker signal noise including the first controlled variable together with the einkoppelnden over the path 1 Interference signal on and leads it to the second control network of the backward control.
  • the tuning of the backward control is designed so that it is optimal in the case of tight closure.
  • the feedback control and the control gain in the control network 400 completely compensates for a control gain of the feedforward control.
  • FIG. 6 The other extreme case is in FIG. 6 represented by a leaky conclusion.
  • a more or less variable distance is provided between the ear of a user and the housing of the speaker.
  • the air volume is therefore undefined.
  • due to the lack of closure between the ear and the loudspeaker housing there is only slight attenuation for interfering noise which reaches the user's ear via path 1. Since the termination to the ear is very leaking, much of the sound energy of the speaker is lost here, without being detected by the microphone 200 of the backward control. Accordingly, a controlled variable of the backward control is very small and has hardly any effect.
  • the feedforward control is tuned. This detects the noise over the path 2 with its microphone 100 and supplies it to a control network 500.
  • the control network 500 generates therefrom the first control variable, which is supplied to the adder 600 together with a very small second controlled variable of the feedback control.
  • the tuning of the filter function of the feedforward control is done in this case, so that when a leaking conclusion of the speaker housing, the forward control for noise reduction works optimally. Due to the sound losses due to the leaky finish, the effect of the reverse control is very low.
  • Terminals shown represent the extreme cases of the application for the control system according to the invention.
  • the backward control shows the maximum effect, while the feedforward is mismatched for this application.
  • the backward control has no effect and the noise compensation is achieved by the tuned for this case, forward control.
  • FIG. 2 again shows the system representation of the forward and reverse control in another view.
  • the feedforward control comprises a control network 500 with three components shown schematically here.
  • the control network 500 of the feedforward control 10 receives the noise picked up by the microphone 100.
  • the control network 500 includes one or more filters that substantially cause an inversion of the phase of the received signal by 180 °.
  • the second element 502 schematically shows the frequency response of the feedforward control.
  • the control network 500 also comprises one or more control amplifiers, which are designed in such a way that the control gain increases as a function of increasing leakage. This is an inherent property of the feedforward control since it does not include information regarding tightness and acoustics.
  • the feedforward control 10 thus has to be tuned to a predetermined acoustic ratio, for example an open or leaky end.
  • the output of the feedforward control 10 is connected to an adder 600 which is coupled on the output side to the loudspeaker 300.
  • a second microphone 200 is disposed in the vicinity of the speaker 300 and thus detects passively attenuated noises as well as the signals emitted by the loudspeaker 300.
  • the microphone 200 is connected to the second control network 400, which forms part of the feedback control.
  • the second rule network also includes several Elements that are shown schematically. These include filter elements for an inversion of the phase position, which have a certain frequency response.
  • the control network 400 also includes a control gain 401 that depicts a dependence on the tightness of the termination of the speaker at an ear of a user.
  • the output signal of the feedback control is fed to a second input of the adder 600.
  • the efficiency of an active noise suppression in the diagram of FIG. 3 demonstrate.
  • the noise suppression itself is effective only over a predetermined frequency range.
  • the forward and reverse control in the frequency domain there are differences in the forward and reverse control in the frequency domain.
  • the backward control shows a slightly lower frequency range, in which a good noise compensation is feasible.
  • the control gain of the feedback control must be mitigated to ensure the stability of the system because of the deadtime of the path between the compensating loudspeaker and the microphone of the feedback control.
  • the curve KFF shows the frequency dependence of a feed forward control
  • the curve KFB a feedforward control individually considered.
  • the invention is therefore particularly suitable for the mobile radio sector, in which there are substantially variable acoustic conditions.
  • a useful signal can be, for example, a voice signal, music signal or the like.
  • This coupling which takes place, for example, in the control network of the feedback control in a control amplifier allows it to deliver useful signal through the speaker while minimizing from the outside einkoppelnde noise.
  • this can also be filtered or specially processed in order to minimize disturbance of the useful signal due to the backward or forward control. At the same time a good noise suppression is ensured even with a variable distance of the speaker housing to the ear through the two schemes.
  • An exemplary control network for the forward or reverse control shows FIG. 9 , On the input side, the control network is connected to the corresponding microphone. It includes a preamplifier that over the illustrated two RC network groups is coupled to a power amplifier arranged on the output side.
  • the network groups each comprise RC networks with parallel-connected operational amplifiers and serve for an amplitude adjustment and a phase inversion of the applied and preamplified input signal.
  • the RC network groups are adjustable in terms of their transfer characteristic, the gain of the operational amplifier as well. This allows a predetermined characteristic, which results from the speaker housing and / or the microphone mimic well and thus achieve the desired phase inversion.
  • FIG. 8 shows a corresponding realization.
  • a first microphone 100 is arranged in a mobile radio part housing on a side facing away from the loudspeaker. This forms the part of the feedforward control.
  • the speaker 300 itself is mounted in a speaker housing having a predefined first fixed volume of air.
  • a second air volume 210 is arranged, which likewise forms part of the mobile radio housing.
  • This additional housing 210 comprises, in addition to an optional compensation opening 220 and the central opening for outputting the loudspeaker signal 230, the microphone 200.
  • the central opening 230 can now be covered so that a predefined and fixed air volume results from the loudspeaker housing 301 and the additional housing 210.
  • the backward control can now be tuned by the filters within the control network and the amplification factors of the amplifiers are chosen so that the maximum extinction results in the desired frequency range. Accordingly, the feedforward control is adjusted by removing the cover from the central opening 230.

Claims (14)

  1. Système de régulation pour une inhibition active de bruit, comprenant:
    - un haut-parleur (300) pour l'émission de son;
    - un dispositif additionneur (600) auquel le haut-parleur (300) est raccordé, comportant une première et une deuxième entrée;
    - une régulation avant (10) présentant
    - un premier microphone (100) pour la réception de bruits perturbateurs;
    - un premier réseau de régulation (500) avec au moins un filtre pour la formation d'une première grandeur de régulation, sachant que le premier réseau de régulation (500) est couplé au premier microphone (100) côté entrée et au dispositif additionneur (600) côté sortie pour l'amenée de la première grandeur de régulation;
    - une régulation arrière (20) présentant
    - un deuxième microphone (200) pour la réception d'un son émis par le haut-parleur (300);
    - un deuxième réseau de régulation (400) avec au moins un filtre pour la formation d'une deuxième grandeur de régulation, sachant que le deuxième réseau de régulation (400) est couplé au deuxième microphone (200) côté entrée et au dispositif additionneur (600) côté sortie;
    caractérisé en ce que
    - la régulation arrière (20) est ajustée pour une inhibition de bruit sur la base d'un premier rapport acoustique, la régulation avant (10) est ajustée pour une inhibition de bruit sur la base d'un deuxième rapport acoustique;
    - le premier rapport acoustique correspond à une première distance entre le haut-parleur (300) et un tympan d'un utilisateur et le deuxième rapport acoustique correspond à une deuxième distance entre le haut-parleur (300) et le tympan, sachant que la deuxième distance est plus grande que la première distance; et
    - l'ajustement de la régulation avant (10) et de la régulation arrière (20) est invariable, du moins pendant le fonctionnement du système de régulation.
  2. Système de régulation selon la revendication 1, dans lequel le premier rapport acoustique correspond à une jonction sensiblement serrée du haut-parleur (300) avec une oreille d'un utilisateur et le deuxième rapport acoustique correspond à une jonction non serrée du haut-parleur (300) avec l'oreille.
  3. Système de régulation selon l'une des revendications 1 ou 2, dans lequel le premier et/ou le deuxième réseau de régulation (400) présente une amplification de régulation ajustée pour le rapport acoustique respectif.
  4. Système de régulation selon l'une des revendications 1 à 3, dans lequel le premier et/ou le deuxième réseau de régulation (400, 500) présentent au moins un montage en série constitué d'un amplificateur de régulation et d'un filtre RC.
  5. Système de régulation selon l'une des revendications 1 à 4, dans lequel le premier et le deuxième réseau de régulation (400, 500) se basent sur une régulation entièrement analogique.
  6. Système de régulation selon l'une des revendications 1 à 5, comprenant en outre:
    - un boîtier de haut-parleur (700, 300) pour le logement du haut-parleur (301), qui entoure essentiellement un premier volume d'air, et
    - un boîtier supplémentaire (210) qui entoure essentiellement un deuxième volume d'air et est disposé dans une direction préférentielle pour la diffusion sonore du boîtier de haut-parleur (301).
  7. Système de régulation selon la revendication 6, dans lequel le boîtier supplémentaire (210) est configuré pour le logement du deuxième microphone (200).
  8. Système de régulation selon la revendication 6 ou 7, dans lequel le deuxième réseau de régulation (500) est ajusté pour une inhibition de bruit qui est basée sur le premier et le deuxième volume d'air.
  9. Système de régulation selon l'une des revendications 1 à 8, dans lequel la régulation avant présente une plage de régulation plus élevée que la régulation arrière.
  10. Procédé pour l'inhibition active de bruit pour un haut-parleur (300) pour l'émission de son, le procédé comprenant:
    - la mise à disposition d'une régulation arrière pour l'inhibition de bruit en ajustement avec un premier rapport acoustique;
    - la mise à disposition d'une régulation avant pour l'inhibition de bruit en ajustement avec un deuxième rapport acoustique;
    sachant que le premier rapport acoustique correspond à une première distance entre le haut-parleur (300) et un tympan d'un utilisateur et le deuxième rapport acoustique correspond à une deuxième distance entre le haut-parleur (300) et le tympan, sachant que la deuxième distance est plus grande que la première distance; et
    sachant que l'ajustement de la régulation avant et de la régulation arrière est invariable, du moins pendant le fonctionnement de régulation.
  11. Procédé selon la revendication 10, dans lequel le premier rapport acoustique correspond à une jonction sensiblement serrée du haut-parleur (300) avec une oreille d'un utilisateur et le deuxième rapport acoustique correspond à une jonction non serrée du haut-parleur (300) avec l'oreille.
  12. Procédé selon l'une des revendications 10 ou 11, dans lequel l'étape de compensation comprend:
    la saisie de la grandeur de régulation de la régulation avant comme grandeur perturbatrice par la régulation arrière.
  13. Procédé selon l'une des revendications 10 à 12, dans lequel la mise à disposition de la régulation avant comprend:
    - la réception de bruits perturbateurs;
    - l'amplification du bruit perturbateur reçu;
    - le filtrage du bruit perturbateur reçu;
    - la sortie du bruit perturbateur filtré;
    sachant que le filtrage s'effectue de telle façon que, dans une première zone devant le haut-parleur, une élimination du bruit perturbateur est au moins en partie obtenue avec le bruit perturbateur filtré et amplifié.
  14. Procédé selon l'une des revendications 10 à 13, dans lequel la mise à disposition de la régulation arrière comprend:
    - la réception de bruits perturbateurs dans la zone du haut-parleur;
    - l'amplification du bruit perturbateur reçu;
    - le filtrage du bruit perturbateur reçu de telle façon que, dans une deuxième zone devant le haut-parleur, une élimination du bruit perturbateur est au moins en partie obtenue avec le bruit perturbateur filtré et amplifié;
    - la sortie du bruit perturbateur filtré.
EP12701505.5A 2011-03-08 2012-01-25 Système de réglage pour une suppression active du bruit ainsi que procédé de suppression active du bruit Active EP2684188B8 (fr)

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DE102011013343A DE102011013343B4 (de) 2011-03-08 2011-03-08 Regelsystem für aktive Rauschunterdrückung sowie Verfahren zur aktiven Rauschunterdrückung
PCT/EP2012/051152 WO2012119808A2 (fr) 2011-03-08 2012-01-25 Système de réglage pour une suppression active du bruit ainsi que procédé de suppression active du bruit

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DE102011013343B4 (de) 2012-12-13
US20140051483A1 (en) 2014-02-20
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WO2012119808A3 (fr) 2013-05-30
DE102011013343A1 (de) 2012-09-13
EP2684188B8 (fr) 2018-08-15
EP2684188A2 (fr) 2014-01-15

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