EP0774749B1 - Aktives Schallabsorptionssystem für ein Kraftfahrzeug - Google Patents

Aktives Schallabsorptionssystem für ein Kraftfahrzeug Download PDF

Info

Publication number
EP0774749B1
EP0774749B1 EP96116233A EP96116233A EP0774749B1 EP 0774749 B1 EP0774749 B1 EP 0774749B1 EP 96116233 A EP96116233 A EP 96116233A EP 96116233 A EP96116233 A EP 96116233A EP 0774749 B1 EP0774749 B1 EP 0774749B1
Authority
EP
European Patent Office
Prior art keywords
controller
sound pressure
absorption system
sound absorption
sound
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.)
Expired - Lifetime
Application number
EP96116233A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0774749A3 (de
EP0774749A2 (de
Inventor
Helmut Spannheimer
Johannes Waldinger
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0774749A2 publication Critical patent/EP0774749A2/de
Publication of EP0774749A3 publication Critical patent/EP0774749A3/de
Application granted granted Critical
Publication of EP0774749B1 publication Critical patent/EP0774749B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure 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
    • 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
    • G10K11/1783—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G10K11/17833—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
    • G10K11/17835—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels using detection of abnormal input 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • 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
    • G10K2210/3012—Algorithms
    • 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
    • G10K2210/3025—Determination of spectrum characteristics, e.g. FFT
    • 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
    • G10K2210/3028—Filtering, e.g. Kalman filters or special analogue or digital filters
    • 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
    • G10K2210/3033—Information contained in memory, e.g. stored signals or 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
    • G10K2210/50—Miscellaneous
    • G10K2210/503—Diagnostics; Stability; Alarms; Failsafe

Definitions

  • the invention relates to an active sound absorption system, in particular for a motor vehicle, with at least one speaker for generating Sound pressure, which is the input value of the sound pressure in the motor vehicle interior processing controller is controlled.
  • an active sound absorption system in particular for a motor vehicle, with at least one speaker for generating Sound pressure, which is the input value of the sound pressure in the motor vehicle interior processing controller is controlled.
  • DE 42 26 885 A1 for example, as well as the not yet published German patent application 44 46 080, which is an advantageous development of that described in the first-mentioned document Sound absorption system includes.
  • DE 42 36 155 A1 which is also an active sound absorption system describes at the selected frequencies of the sound spectrum be evaluated for the controller setting. For setting an imperceptible measurement signal is used.
  • An active sound absorption system for a motor vehicle essentially consists of at least one microphone as a sensor for detecting the sound pressure in the vehicle interior. The output signal of this microphone is then fed via a controller with a suitable frequency response to at least one loudspeaker, which then emits sound into the vehicle interior, which feeds back to the microphone via the transmission behavior of the loudspeaker.
  • a basic structure of such an active sound absorption system is shown in FIG. 1.
  • Reference number 11 denotes a sound pressure sensor or microphone
  • the controller has reference number 12
  • the loudspeaker has reference number 13.
  • the control circuit of this active sound absorption system just described is shown in FIG. 2 shown.
  • p disturb denotes the disturbing sound pressure in the vehicle interior
  • p active system the sound pressure generated by the active sound absorption system
  • p tot the actual sound pressure in the vehicle interior.
  • H Mik the transfer function of the microphone is designated, with H controller the transfer function of the controller and with H LS the transfer function of the loudspeaker.
  • the controller 12 emits an output signal which is the input variable for the loudspeaker 13, this input variable being the voltage applied to the loudspeaker, namely U LS .
  • the membrane deflection of the loudspeaker which is denoted by x LS , acts via the transfer function H LS-Mik as the sound pressure p already mentioned at the beginning active system feedback in the control loop.
  • certain stability conditions must be met, which depend essentially on the transfer functions of the individual control loop elements just mentioned.
  • the described control circuit or controller 12 can initially be designed in a simple manner in such a way that the desired sound pressure-reducing behavior is achieved.
  • this basic design is only valid as long as the transmission elements of the control loop have the properties determined during the design.
  • the parameters of the loudspeaker 13 or the microphone 11 change considerably with their temperature or also due to aging.
  • the transmission behavior H LS-Mik can also vary considerably, for example due to different loading or occupancy states of the motor vehicle. In fact, the number of people in the interior of the motor vehicle, for example, has a significant influence.
  • the object of the invention is therefore to show measures by means of which an active sound absorption system can be set automatically under all circumstances and boundary conditions with regard to the best possible sound absorption.
  • a controller characteristic is temporarily changed, that the difference between the respective sound pressure spectra (in the vehicle interior) is formed with the various controller parameters, and that the optimal controller parameter with regard to a certain difference is set.
  • Advantageous training and further education are included in the subclaims.
  • the controller is based on its basic setting automatically out of tune.
  • a controller parameter is changed, see above for example or preferably the controller gain.
  • this controller parameter can with this controller parameter to be changed, however, also by one adjustable phase shift or by at least one adjustable Act controller filter coefficients.
  • the controller gain as to be changed Controller parameter used as a basis.
  • the present invention now takes advantage of the variation in effectiveness in view to a sound absorption or the variation of the ignition as a result a change in the controller gain to make statements about the actual Effectiveness to reduce sound pressure or to fuel the Sound pressure in the vehicle interior. It is as follows proceeded: After the controller corresponds to the original Parameters of the individual transmission elements of the control loop optimal has been designed with regard to its effectiveness in reducing sound pressure, the absolute sound pressure reduction depends on the optimal controller gain from. Assuming a given controller gain, so you can vary them within a certain range without being a nuisance audible change in sound pressure reduction occurs. Stronger changes the controller gain (or generally a controller parameter) on the other hand, this leads to a greater build-up. Now with different Regulator gains determined the respective sound pressure spectrum and then the difference between the respective sound pressure spectra, which were achieved with the various controller gains, formed, so an optimal controller gain with regard to a certain Difference can be set.
  • the control loop is thus alternating with at least operated two different controller parameters. That achieved with it
  • the result is analyzed, namely the respective sound pressure spectra recorded and their difference formed.
  • This difference has one certain value, then there is an optimal controller parameter.
  • there this difference can be a fixed threshold value, but it can also be any Function stored or the optimal controller parameter can be an experimentally determined value depending on the difference of the Sound pressure spectra are stored in a table.
  • the sound pressure spectrum can be determined using an FFT analysis in the vehicle interior with a fixed value for the controller gain (or controller parameter) can be determined.
  • the controller gain or controller parameter
  • the difference is preferred between the sound pressure spectra in such a frequency range analyzed, in which a kindling occurs.
  • the difference spectra it is therefore helpful to maximize the sound pressure in the Vehicle interior to be considered, which - as is known - with increasing Controller gain is growing. Especially when you are using the controller gain gets close to the stability limit of the controller, the Firing up disproportionately quickly with an increase in controller gain to.
  • the controller gain level can be increased.
  • the next one Switching between two controller gains can thus be a total done at a higher level.
  • the controller parameter can when falling below a fanning threshold in the sense an increase in the difference in sound pressure spectra can be changed.
  • the controller gain can be increased or decreased with constant factors or depending on the value of the determined fanning. This means that for example the controller gain is reduced more if a larger increase is detected.
  • the factor for modifying the controller gain can then - as above already specified - be a function that depends on the kindling.
  • the sound pressure reduction d. H. the effective sound absorption are analyzed. That is, the difference the sound pressure spectra can also be analyzed in such a frequency range in which the main reduction in sound pressure takes place.
  • the invention is based on the fact that a controller characteristic variable (preferably the controller gain) is temporarily changed. At times, there is thus a switchover between at least two controller parameters. This switchover (preferably of the amplification) can take place both at regular time intervals and at irregular time intervals.
  • the change between the individual controller gains / controller parameters can be carried out as a jump function, but also as a ramp or otherwise smoothed in order to prevent the switching process from being heard by the vehicle occupants.
  • the controller parameter to be changed can only be changed slightly in order to obtain sufficiently precise statements. Deviating from this, however, it is also possible to maximally change the controller parameter to be changed by switching the entire controller 12 of the active sound absorption system on or off.
  • the sound pressure spectra can preferably be recorded with the microphone 11 of the controller 12 which is already present and necessary.
  • other boundary conditions can also change at the same time as the controller parameter to be changed is changed.
  • the road surface on which the motor vehicle is traveling can change, which at the same time causes a change in the sound pressure p tot in the vehicle interior.
  • a different road surface or cross wind, a different driving speed or the like naturally changes the disturbing sound pressure p disturb in the vehicle interior.
  • the change in the controller characteristic variable is preferably carried out several times and a difference mean value to be analyzed is formed from the resulting difference values.
  • This difference mean is then to be equated with the difference in the sound pressure spectra, as specified in the characterizing part of claim 1.
  • the sound pressure changes p sturgeon or p ges caused by an altered stimulation from the outside, thereby eliminating that the switching over of the controller between different controller parameters / controller gains is repeated several times, and that this plurality of differential spectra or differential values, that result from the difference between the respective sound pressure spectra then be averaged.
  • a reliable statement about the effectiveness of the functionality of the active sound absorption system is thus obtained. This procedure of changing the controller parameter several times is explained in more detail below in connection with FIG. 3.
  • Obtaining interference removal can be done as follows : With the same controller parameter, the differences can also the sound pressure spectra obtained are formed and averaged. If these differences are averaged towards zero, it is a sufficient averaging number reached and the evaluation process can begin. In other Words can thus be used to check the convergence of the method Difference between the possibly averaged spectra with the same in each case Regulator gain can be formed. If there is sufficient convergence average these differences to zero. This can thus be exploited to to determine virtually online the number of necessary averaging of the differences, after which an evaluation takes place.
  • Fig. 3 is the controller gain over time as the abscissa - this is here the controller parameter to be changed - plotted on the ordinate. How the controller gain between two gain values can be seen over time A and B switched temporarily.
  • the control loop shown in FIG. 2 is operated with a controller gain A.
  • t 1 Within the time period t 1 , several sound pressure spectra are determined - this is shown by the vertical lines on the associated straight line - after which some of these sound pressure spectra are averaged. This is represented by the combination of the individual sound pressure spectra in an ellipse, which is designated by the number 1.
  • an averaged sound pressure spectrum which is represented by the ellipse 3 is recorded again in this time period t 2 .
  • controller gain A now we are in time t 3 .
  • an average sound pressure spectrum is again determined, this is shown in the ellipse 4.
  • the difference between the sound pressure spectra or ellipses 4 and 3 is formed again, the corresponding difference value is designated 8.
  • the routine described for setting an optimal controller parameter is ended when an error is detected.
  • it is virtually checked whether the control loop itself is not already unstable. In the event of a possible instability, the control loop starts to oscillate with increasing amplitude until a transmission element of the control loop no longer allows a larger amplitude due to its design.
  • the state of the instability can be recognized if it exceeds a maximum value that is below the physically maximum possible sound pressure and above a usually reasonable sound pressure. If this threshold value is exceeded, the controller is preferably switched off, but another error handling algorithm can also be initiated.
  • the controller gain can be reduced by several powers of ten, or a new calibration process can be started, which essentially corresponds to an initialization routine as briefly described in the earlier German patent application 44 46 080 mentioned at the beginning. It can be provided that the controller is switched off when the sound pressure in the vehicle interior is excessively loud and the active sound absorption system can no longer reduce the sound pressure p disturbance without damaging the control loop transmission elements or without strong distortions due to its physically maximum possible amplitude. Instead of the maximum sound pressure value, any other signal in the control loop can be used for checking, for example the output voltage of the controller 12 or a control maximum value U LS for the loudspeaker. As already briefly indicated, even if the algorithm for error detection detects an error, that is, if e.g. B. adjusts the controller gain to a value significantly below the specified value, starts a calibration process that measures the control loop parameters again and correctly re-sets the associated controller parameters, in particular all, ie also those that are not varied in the error detection algorithm.
  • the present invention thus becomes a reliable one Criterion that provides a precise statement of the effectiveness of the Sound absorption or by fanning the sound absorption system allows a controller parameter, in particular the controller gain optimally set and the undesired case of excessive controller gain, which would lead to control loop instability. It is thus possible to use the active sound absorption system according to the invention to check for correct working. In particular, a Increase in the sound pressure in the vehicle interior if the active one is defective Sound absorption system or avoided with changed boundary conditions.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP96116233A 1995-11-18 1996-10-10 Aktives Schallabsorptionssystem für ein Kraftfahrzeug Expired - Lifetime EP0774749B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19543128 1995-11-18
DE19543128A DE19543128A1 (de) 1995-11-18 1995-11-18 Aktives Schallabsorptionssystem für ein Kraftfahrzeug

Publications (3)

Publication Number Publication Date
EP0774749A2 EP0774749A2 (de) 1997-05-21
EP0774749A3 EP0774749A3 (de) 1999-07-28
EP0774749B1 true EP0774749B1 (de) 2003-10-08

Family

ID=7777858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96116233A Expired - Lifetime EP0774749B1 (de) 1995-11-18 1996-10-10 Aktives Schallabsorptionssystem für ein Kraftfahrzeug

Country Status (3)

Country Link
EP (1) EP0774749B1 (es)
DE (2) DE19543128A1 (es)
ES (1) ES2207661T3 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006045627A1 (de) * 2006-09-27 2008-04-03 Robert Bosch Gmbh Anordnung zur aktiven Geräuschkompensation für ein elektronisch gesteuertes Scheibenwischersystem eines Kraftfahrzeugs
DE102008013846A1 (de) * 2008-03-12 2009-09-17 Claas Selbstfahrende Erntemaschinen Gmbh Landwirtschaftliche Arbeitsmaschine mit geräuschgedämpfter Kabine
DE102015219144A1 (de) * 2015-10-02 2017-04-06 Robert Bosch Gmbh Verfahren zum Betreiben einer aktiven Gasleitungsanlage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3471370B2 (ja) * 1991-07-05 2003-12-02 本田技研工業株式会社 能動振動制御装置
GB2265277B (en) * 1992-03-17 1996-07-24 Fuji Heavy Ind Ltd Noise reduction system for automobile compartment
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
DE4236155C2 (de) * 1992-10-20 1996-02-08 Gsp Sprachtechnologie Ges Fuer Verfahren und Anordnung zur aktiven Innengeräuschreduzierung bei Fahrzeugen
DE4303921A1 (de) * 1993-02-10 1994-08-11 Bayerische Motoren Werke Ag Verfahren zur Messung eines Differenzschalls durch Subtraktion eines über einen Lautsprecher gerade abgegebenen Schalls von einem Gesamtschall

Also Published As

Publication number Publication date
EP0774749A3 (de) 1999-07-28
DE59610759D1 (de) 2003-11-13
EP0774749A2 (de) 1997-05-21
DE19543128A1 (de) 1997-05-22
ES2207661T3 (es) 2004-06-01

Similar Documents

Publication Publication Date Title
DE69931580T2 (de) Identifikation einer akustischer Anordnung mittels akustischer Maskierung
DE4308923C2 (de) Aktive Geräuschverringerungsvorrichtung
EP2145170B1 (de) VERFAHREN ZUR BESTIMMUNG UND/ODER ÜBERWACHUNG EINER PROZESSGRÖßE EINES MEDIUMS UND ENTSPRECHENDE VORRICHTUNG
DE69725060T2 (de) Audiosystem
DE3790072C2 (de) Verfahren und Schaltung zur automatischen Verstärkungssteuerung eines elektrischen analogen Signals
EP0661905B1 (de) Verfahren zur Anpassung eines Hörgerätes, Vorrichtung hierzu und Hörgerät
DE2035479A1 (de) Signalkompressor oder -expander
DE2921556C2 (de) Einrichtung zur Einstellung eines Bandaufzeichnungsgerätes
DE3222495A1 (de) Selbsttaetige lautstaerke-regelvorrichtung
DE69816354T2 (de) Trennvorrichtung für nicht-stationäre Quellen
DE3006810C2 (es)
DE102006047965A1 (de) Hörhilfsgerät mit einer Okklusionsreduktionseinrichtung und Verfahren zur Okklusionsreduktion
DE3013344A1 (de) Vorrichtung und verfahren zur verstaerkungssteuerung von eingangssignalen
DE112012005713T5 (de) Vorrichtung zur aktiven Vibrationsstörungssteuerung
EP1290914A2 (de) Verfahren zur anpassung eines hörgerätes an ein individuum
EP1369994B1 (de) Verfahren zur zugehörrichtigen Basspegelanhebung und zugeordnetes Wiedergabesystem
DE112016006169T5 (de) Aktive Lärmschutzvorrichtung
DE112018003662T5 (de) Sprachsignalnivellierung
EP0774749B1 (de) Aktives Schallabsorptionssystem für ein Kraftfahrzeug
EP0731913B1 (de) Vorrichtung zur untersuchung des querprofils einer kontinuierlich erzeugten materialbahn
EP1453355B1 (de) Signalverarbeitung in einem Hörgerät
EP1458216B1 (de) Vorrichtung und Verfahren zur Adaption von Hörgerätemikrofonen
DE2731971B2 (de) Verfahren und Einrichtung zur Steuerung bzw. Regelung einer Nutzschallquelle
EP1351550B1 (de) Verfahren zur Anpassung einer Signalverstärkung in einem Hörgerät sowie ein Hörgerät
EP3880089B1 (de) Druckwellengerät zur behandlung eines menschlichen oder tierischen körpers

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

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE ES FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE ES FR GB IT SE

17P Request for examination filed

Effective date: 20000121

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

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

Ref country code: SE

Payment date: 20031007

Year of fee payment: 8

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT SE

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

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

Ref country code: ES

Payment date: 20031013

Year of fee payment: 8

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20031008

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

Ref country code: FR

Payment date: 20031030

Year of fee payment: 8

REF Corresponds to:

Ref document number: 59610759

Country of ref document: DE

Date of ref document: 20031113

Kind code of ref document: P

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

Ref country code: GB

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

Effective date: 20040108

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

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

Ref country code: DE

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

Effective date: 20040501

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2207661

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
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

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20040108

26N No opposition filed

Effective date: 20040709

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

Ref country code: SE

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

Effective date: 20041011

Ref country code: ES

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

Effective date: 20041011

EUG Se: european patent has lapsed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

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

Effective date: 20050630

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

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 NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051010

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20041011