EP1655997B1 - Method for amplifying an acoustic signal and corresponding acoustic system - Google Patents
Method for amplifying an acoustic signal and corresponding acoustic system Download PDFInfo
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- EP1655997B1 EP1655997B1 EP05109472A EP05109472A EP1655997B1 EP 1655997 B1 EP1655997 B1 EP 1655997B1 EP 05109472 A EP05109472 A EP 05109472A EP 05109472 A EP05109472 A EP 05109472A EP 1655997 B1 EP1655997 B1 EP 1655997B1
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- 238000000034 method Methods 0.000 title claims description 14
- 230000004044 response Effects 0.000 claims description 80
- 230000003321 amplification Effects 0.000 claims description 23
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 23
- 238000010586 diagram Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 206010011878 Deafness Diseases 0.000 description 2
- 230000010370 hearing loss Effects 0.000 description 2
- 231100000888 hearing loss Toxicity 0.000 description 2
- 208000016354 hearing loss disease Diseases 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
- H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically
Definitions
- the present invention relates to a method for amplifying an acoustic signal, in particular for a hearing aid, by recording a limiting gain frequency response of the amplification device, which represents the limit for feedback whistles. Moreover, the present invention relates to a corresponding acoustic system.
- desired gain curves are calculated based on the measured hearing loss. These generally prescribe the corresponding gain values for three input levels in the frequency domain. Due to the ambient conditions when wearing a hearing device, it is possible for the amplified signal emitted by the hearing device user to be picked up again by the hearing device microphones. This is particularly the case with open supply and with leaks in the case of a closed supply. If the feedback loop microphone-listener feedback path microphone is not attenuating at any frequency, whistling will occur.
- the feedback whistling is disturbing not only for the hearing aid listener himself, but also for those in his environment.
- the target gain curve is lowered slightly.
- the amplitude response of the feedback loop is measured after its separation at one point and for each frequency that gain is determined which represents the limit for feedback or feedback whistles.
- this limit gain must always be below. Since feedback paths are only conditionally static, and thus the limit gain can be temporarily exceeded, the gain is usually reduced so far that always there is a minimum distance to the measured limit gain curve.
- the document DE 101 31 964 A1 be removed.
- the document proposes a method for operating a hearing aid, in which a gain reduction is made as soon as a noise is detected as such.
- the document shows US20040109578 a method and a device for reducing feedback in a hearing aid wherein the system distance, ie the distance of the loop gain of the feedback system to its predetermined stability limit, measured and the gain is reduced accordingly.
- the object of the present invention is therefore to propose a method with which feedback whistles can be prevented more reliably.
- a corresponding acoustic system should be specified.
- this object is achieved by a method for amplifying an acoustic signal, in particular for a hearing aid, by recording a limit amplification frequency response of the amplification device, which represents the limit for feedback whistles, and establishing a desired amplification frequency response with a plurality of interpolation points, in which each interpolation point to the boundary amplification frequency response in at least two different directions in the gain frequency diagram has a predetermined minimum distance.
- the invention provides an acoustic system with an amplifying device and a recording device for receiving a limit gain frequency response of the amplifying device, which is the limit for feedback whistles, and a computing device for establishing a desired gain frequency response with multiple support points, wherein each support point to the Grenzverstärkungsfrequenzgang in at least two different directions in the amplification frequency diagram has a predetermined minimum distance, and for feeding the desired gain frequency response in the amplifying means.
- this ensures that the amplitude response, i. the gain frequency response of the feedback path may change due to dynamic processes not only in the gain direction, but also shifts of resonances in the frequency direction can be tolerated.
- the respective minimum distance of the desired amplification frequency response from the limiting amplification frequency response in the horizontal and vertical directions is preferably predetermined. This means that minimum distances in the direction of reinforcement and in the frequency direction are mandatory.
- the distance between the desired gain frequency response and the limit gain frequency response can be determined at least in a partial region of the frequency response by means of a circle whose center is shifted on the curve of the desired gain frequency response and which always affects the curve of the limit gain frequency response.
- the desired amplification frequency response as a function of the limiting gain frequency response while maintaining a minimum distance perpendicular to the curve of Calculate target gain frequency response easily.
- the desired gain can be selected higher or lower according to other criteria.
- the distance between the nominal amplification frequency response and the limit amplification frequency response can also be determined with the aid of an ellipse, the center of which is shifted on the curve of the nominal amplification frequency response and which always affects the curve of the limit amplification frequency response. It can thereby be achieved that the minimum distance in the horizontal direction differs from the minimum distance in the vertical direction.
- the distance between the desired gain frequency response and the limit gain frequency response is set differently in at least two frequency ranges. This can be used to respond more specifically to the dynamic behavior of the acoustic system. In particular, in frequency ranges that are little affected by dynamic changes, the minimum distance between the two frequency responses can be kept lower.
- the gain is to be adjusted as a function of the measured amplitude response such that a minimum distance is maintained two-dimensionally.
- the gain curve not only vertically, but also horizontally a certain minimum distance must comply.
- a measured limit amplification frequency response g for a hearing device is shown in the FIG. In the range of 2.5 kHz and 6 kHz are resonances that are caused by the hearing aid in the inserted state. In these areas, therefore, the limit gain at which no attenuation occurs in the feedback loop is relatively small.
- a desired gain frequency response sv may be determined which is lower than the limit gain frequency response g, i.e., downwards. in the gain direction, is shifted. For example, the gain at each frequency is reduced by 6 dB.
- the target gain frequency response is selectively further reduced so that the desired gain frequency response se results.
- This target gain frequency response se also holds in the horizontal direction, i. in the frequency direction a minimum distance to the limit gain frequency response g.
- the curve se is determined by means of an ellipse whose main axes define the vertical and horizontal distance.
- the ellipse also sets the minimum distances in the angles deviating from the horizontal and the vertical angles. In other words, if the ellipse with its midpoint along the curve se is moved, it always touches the curve g only tangentially.
- a circle or another structure or another function could be used to determine the desired amplification frequency response se.
- a circle would ensure an orthogonal distance between the two curves g and se.
- the minimum distance of the two frequency responses over the entire frequency range is determined in the same way.
- the distance may be set in one or more parts of the frequency range by different methods. For example, the distance in the low frequency range, where hardly any resonances are to be expected, could be chosen to be relatively low and correspondingly higher in the higher frequency range.
- a significant advantage of the inventive choice of the target gain frequency response is that the vertical distance to Grenzverstärkungsfrequenzgang may not be so large, since in the case of a pure vertical spacing corresponding to the curve sv for achieving a sufficient horizontal distance, the vertical distance would be much greater.
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Description
Die vorliegende Erfindung betrifft ein Verfahren zur Verstärkung eines Akustiksignals insbesondere für ein Hörgerät durch Aufnehmen eines Grenzverstärkungsfrequenzgangs der Verstärkungseinrichtung, welcher die Grenze für Rückkopplungspfeifen darstellt. Darüber hinaus betrifft die vorliegende Erfindung ein entsprechendes Akustiksystem.The present invention relates to a method for amplifying an acoustic signal, in particular for a hearing aid, by recording a limiting gain frequency response of the amplification device, which represents the limit for feedback whistles. Moreover, the present invention relates to a corresponding acoustic system.
Um ein Hörgerät auf den Hörverlust anzupassen, werden basierend auf dem gemessenen Hörverlust Sollverstärkungskurven berechnet. Diese schreiben für im Allgemeinen drei Eingangspegel im Frequenzbereich die entsprechenden Verstärkungswerte vor. Durch die Umgebungsbedingungen beim Tragen eines Hörgeräts ist es möglich, dass das vom Hörgerätehörer abgegebene, verstärkte Signal durch die Hörgerätemikrophone erneut aufgenommen wird. Dies ist insbesondere der Fall bei offener Versorgung und bei Undichtigkeiten im Falle einer geschlossenen Versorgung. Ist die Rückkopplungsschleife Mikrophon-Hörer-Feedbackpfad-Mikrofon bei irgendeiner Frequenz nicht dämpfend, so tritt Pfeifen auf.To adapt a hearing aid to hearing loss, desired gain curves are calculated based on the measured hearing loss. These generally prescribe the corresponding gain values for three input levels in the frequency domain. Due to the ambient conditions when wearing a hearing device, it is possible for the amplified signal emitted by the hearing device user to be picked up again by the hearing device microphones. This is particularly the case with open supply and with leaks in the case of a closed supply. If the feedback loop microphone-listener feedback path microphone is not attenuating at any frequency, whistling will occur.
Das Rückkopplungspfeifen ist nicht nur für den Hörgerätehörer selbst, sondern auch für die in seiner Umgebung befindlichen Personen störend. Um das Pfeifen zu vermeiden wird üblicherweise die Sollverstärkungskurve etwas gesenkt. Hierzu wird dem Amplitudengang der Rückkopplungsschleife nach deren Auftrennen an einer Stelle gemessen und für jede Frequenz diejenige Verstärkung bestimmt, welche die Grenze für Feedback- bzw. Rückkopplungspfeifen darstellt. Um Pfeifen zu verhindern, muss diese Grenzverstärkung immer unterschritten sein. Da Feedbackpfade nur bedingt statisch sind, und somit die Grenzverstärkung temporär überschritten werden kann, wird gängigerweise die Verstärkung soweit reduziert, dass immer ein Mindestabstand zur gemessenen Grenzverstärkungskurve vorliegt.The feedback whistling is disturbing not only for the hearing aid listener himself, but also for those in his environment. In order to avoid the whistling usually the target gain curve is lowered slightly. For this purpose, the amplitude response of the feedback loop is measured after its separation at one point and for each frequency that gain is determined which represents the limit for feedback or feedback whistles. To prevent whistling, this limit gain must always be below. Since feedback paths are only conditionally static, and thus the limit gain can be temporarily exceeded, the gain is usually reduced so far that always there is a minimum distance to the measured limit gain curve.
Der in den oberen beiden Abschnitten beschriebene Stand der Technik kann beispielsweise der Druckschrift
In der Druckschrift
Des Weiteren zeigt das Dokument
Trotz einer aus dem Stand der Technik bekannten Reduzierung der Sollverstärkungskurve kann es insbesondere im Bereich von Resonanzen dennoch zu Rückkopplungspfeifen kommen, da sich beispielsweise die Resonanzfrequenzen in Abhängigkeit der Umgebungsbedingungen dynamisch ändern können.Despite a known from the prior art reduction of the target gain curve, it can still lead to feedback whistles, especially in the range of resonances, since, for example, the resonance frequencies can change dynamically depending on the environmental conditions.
Die Aufgabe der vorliegenden Erfindung besteht somit darin, ein Verfahren vorzuschlagen, mit dem Rückkopplungspfeifen sicherer verhindert werden kann. Darüber hinaus soll ein entsprechendes Akustiksystem angegeben werden.The object of the present invention is therefore to propose a method with which feedback whistles can be prevented more reliably. In addition, a corresponding acoustic system should be specified.
Erfindungsgemäß wird diese Aufgabe gelöst durch ein Verfahren zur Verstärkung eines Akustiksignals insbesondere für ein Hörgerät durch Aufnehmen eines Grenzverstärkungsfrequenzgangs der Verstärkungseinrichtung, welcher die Grenze für Rückkopplungspfeifen darstellt, und Erstellen eines Sollverstärkungsfrequenzgangs mit mehreren Stützpunkten, bei dem jeder Stützpunkt zu dem Grenzverstärkungsfrequenzgang in mindestens zwei verschiedenen Richtungen im Verstärkungs-Frequenzdiagramm einen jeweils vorgegebenen Minimalabstand besitzt.According to the invention, this object is achieved by a method for amplifying an acoustic signal, in particular for a hearing aid, by recording a limit amplification frequency response of the amplification device, which represents the limit for feedback whistles, and establishing a desired amplification frequency response with a plurality of interpolation points, in which each interpolation point to the boundary amplification frequency response in at least two different directions in the gain frequency diagram has a predetermined minimum distance.
Darüber hinaus ist erfindungsgemäß vorgesehen ein Akustiksystem mit einer Verstärkungseinrichtung und einer Aufnahmeeinrichtung zur Aufnahme eines Grenzverstärkungsfrequenzgangs der Verstärkungseinrichtung, welche die Grenze für Rückkopplungspfeifen darstellt, sowie einer Recheneinrichtung zum Erstellen eines Sollverstärkungsfrequenzgangs mit mehreren Stützpunkten, bei dem jeder Stützpunkt zu dem Grenzverstärkungsfrequenzgang in mindestens zwei verschiedenen Richtungen im Verstärkungs-Frequenzdiagramm einen jeweils vorgegebenen Minimalabstand besitzt, und zum Einspeisen des Sollverstärkungsfrequenzgangs in die Verstärkungseinrichtung.In addition, the invention provides an acoustic system with an amplifying device and a recording device for receiving a limit gain frequency response of the amplifying device, which is the limit for feedback whistles, and a computing device for establishing a desired gain frequency response with multiple support points, wherein each support point to the Grenzverstärkungsfrequenzgang in at least two different directions in the amplification frequency diagram has a predetermined minimum distance, and for feeding the desired gain frequency response in the amplifying means.
Entsprechend der vorliegenden Erfindung wird damit sichergestellt, dass der Amplitudengang, d.h. der Verstärkungsfrequenzgang, des Feedbackpfades sich aufgrund dynamischer Prozesse nicht nur in Verstärkungsrichtung ändern darf, sondern auch Verschiebungen von Resonanzen in der Frequenzrichtung toleriert werden können.In accordance with the present invention, this ensures that the amplitude response, i. the gain frequency response of the feedback path may change due to dynamic processes not only in the gain direction, but also shifts of resonances in the frequency direction can be tolerated.
Vorzugsweise ist der jeweilige Minimalabstand des Sollverstärkungsfrequenzgangs von dem Grenzverstärkungsfrequenzgang in horizontaler und vertikaler Richtung vorgegeben. Damit sind Minimalabstände in Verstärkungsrichtung und in Frequenzrichtung zwingend eingehalten.The respective minimum distance of the desired amplification frequency response from the limiting amplification frequency response in the horizontal and vertical directions is preferably predetermined. This means that minimum distances in the direction of reinforcement and in the frequency direction are mandatory.
Der Abstand zwischen dem Sollverstärkungsfrequenzgang und dem Grenzverstärkungsfrequenzgang kann zumindest in einem Teilbereich des Frequenzgangs mit Hilfe eines Kreises bestimmt werden, dessen Mittelpunkt auf der Kurve des Sollverstärkungsfrequenzgangs verschoben wird und der die Kurve des Grenzverstärkungsfrequenzgangs dabei stets tangiert. Auf diese Weise lässt sich der Sollverstärkungsfrequenzgang in Abhängigkeit von dem Grenzverstärkungsfrequenzgang unter Einhaltung eines Mindestabstands senkrecht zu der Kurve des Sollverstärkungsfrequenzgangs leicht berechnen. In bestimmten anderen Teilbereichen des Frequenzgangs kann die Sollverstärkung nach anderen Kriterien höher oder niedriger gewählt werden.The distance between the desired gain frequency response and the limit gain frequency response can be determined at least in a partial region of the frequency response by means of a circle whose center is shifted on the curve of the desired gain frequency response and which always affects the curve of the limit gain frequency response. In this way, the desired amplification frequency response as a function of the limiting gain frequency response while maintaining a minimum distance perpendicular to the curve of Calculate target gain frequency response easily. In certain other parts of the frequency response, the desired gain can be selected higher or lower according to other criteria.
Alternativ kann der Abstand zwischen dem Sollverstärkungsfrequenzgang und dem Grenzverstärkungsfrequenzgang zumindest in einem Teilbereich des Frequenzgangs auch mit Hilfe einer Ellipse bestimmt werden, deren Mittelpunkt auf der Kurve des Sollverstärkungsfrequenzgangs verschoben wird und die die Kurve des Grenzverstärkungsfrequenzgangs dabei stets tangiert. Dadurch kann erreicht werden, dass sich der Mindestabstand in horizontaler Richtung von dem Mindestabstand in vertikaler Richtung unterscheidet.Alternatively, the distance between the nominal amplification frequency response and the limit amplification frequency response can also be determined with the aid of an ellipse, the center of which is shifted on the curve of the nominal amplification frequency response and which always affects the curve of the limit amplification frequency response. It can thereby be achieved that the minimum distance in the horizontal direction differs from the minimum distance in the vertical direction.
Darüber hinaus kann vorgesehen sein, dass der Abstand zwischen dem Sollverstärkungsfrequenzgang und dem Grenzverstärkungsfrequenzgang in mindestens zwei Frequenzbereichen unterschiedlich eingestellt wird. Damit kann auf das dynamische Verhalten des Akustiksystems gezielter reagiert werden. Insbesondere kann in Frequenzbereichen, die wenig von Dynamikänderungen betroffen sind, der Mindestabstand der beiden Frequenzgänge geringer gehalten werden.In addition, it can be provided that the distance between the desired gain frequency response and the limit gain frequency response is set differently in at least two frequency ranges. This can be used to respond more specifically to the dynamic behavior of the acoustic system. In particular, in frequency ranges that are little affected by dynamic changes, the minimum distance between the two frequency responses can be kept lower.
Die vorliegende Erfindung wird nun anhand der beigefügten Zeichnung näher erläutert, die verschiedene Sollverstärkungsfrequenzgänge für einen gemessenen Grenzverstärkungsfrequenzgang widerspiegelt.The present invention will now be described in detail with reference to the accompanying drawing, which illustrates various desired gain frequency responses for a measured limit gain frequency response.
Das nachfolgend näher geschilderte Ausführungsbeispiel stellt eine bevorzugte Ausführungsform der vorliegenden Erfindung dar.The embodiment described in more detail below represents a preferred embodiment of the present invention.
Entsprechend dem hier gewählten Beispiel soll die Verstärkung in Abhängigkeit des gemessenen Amplitudengangs so angepasst werden, dass zweidimensional ein Mindestabstand eingehalten wird. Das heißt, dass die Verstärkungskurve nicht nur vertikal, sondern auch horizontal einen bestimmten Mindestabstand einhalten muss. In der FIG ist hierzu ein gemessener Grenzverstärkungsfrequenzgang g für ein Hörgerät dargestellt. Im Bereich von 2,5 kHz und 6 kHz liegen Resonanzen, die durch das Hörgerät im eingesetzten Zustand bedingt sind. In diesen Bereichen ist daher die Grenzverstärkung, bei der keine Dämpfung im Rückkopplungskreis auftritt, verhältnismäßig gering.According to the example selected here, the gain is to be adjusted as a function of the measured amplitude response such that a minimum distance is maintained two-dimensionally. This means that the gain curve not only vertically, but also horizontally a certain minimum distance must comply. For this purpose, a measured limit amplification frequency response g for a hearing device is shown in the FIG. In the range of 2.5 kHz and 6 kHz are resonances that are caused by the hearing aid in the inserted state. In these areas, therefore, the limit gain at which no attenuation occurs in the feedback loop is relatively small.
Damit die Wahrscheinlichkeit des Auftretens von Rückkopplungspfeifen reduziert wird, kann entsprechend dem Stand der Technik ein Sollverstärkungsfrequenzgang sv ermittelt werden, der gegenüber dem Grenzverstärkungsfrequenzgang g vertikal nach unten, d.h. in Verstärkungsrichtung, verschoben ist. Dabei wird beispielsweise die Verstärkung bei jeder Frequenz um 6 dB reduziert.In order to reduce the likelihood of occurrence of feedback whistles, according to the prior art, a desired gain frequency response sv may be determined which is lower than the limit gain frequency response g, i.e., downwards. in the gain direction, is shifted. For example, the gain at each frequency is reduced by 6 dB.
Aus der Grafik ist ohne weiteres zu entnehmen, dass in steilen Bereichen der Frequenzgänge g und sv der horizontale Abstand zwischen beiden Kurven nur sehr gering sein kann. Dies hat zur Folge, dass bei einem Verschieben des tatsächlichen Grenzverstärkungsfrequenzgangs, beispielsweise infolge einer Veränderung der Position des Hörgeräts, der Sollverstärkungsfrequenzgang sv in einem oder mehreren Spektralbereichen über dem aktuellen Grenzverstärkungsfrequenzgang liegt. In diesem Fall tritt dann Pfeifen im Hörgerät auf.It can be seen from the graph that in steep regions of the frequency responses g and sv, the horizontal distance between the two curves can only be very small. As a result, when the actual limit amplification frequency response is shifted, for example due to a change in the position of the hearing device, the desired amplification frequency response sv lies above the current limit amplification frequency response in one or more spectral ranges. In this case, whistling then occurs in the hearing aid.
Erfindungsgemäß wird daher der Sollverstärkungsfrequenzgang selektiv weiter reduziert, so dass sich der Sollverstärkungsfrequenzgang se ergibt. Dieser Sollverstärkungsfrequenzgang se hält auch in horizontaler Richtung, d.h. in Frequenzrichtung einen Mindestabstand zu dem Grenzverstärkungsfrequenzgang g ein.According to the invention, therefore, the target gain frequency response is selectively further reduced so that the desired gain frequency response se results. This target gain frequency response se also holds in the horizontal direction, i. in the frequency direction a minimum distance to the limit gain frequency response g.
Im vorliegenden Beispiel ist die Kurve se mit Hilfe einer Ellipse ermittelt, deren Hauptachsen den vertikalen und horizontalen Abstand definieren. Darüber hinaus legt die Ellipse auch die Mindestabstände in den von der horizontalen und der vertikalen abweichenden Winkeln fest. Mit anderen Worten, wenn die Ellipse mit ihrem Mittelpunkt entlang der Kurve se verschoben wird, berührt sie die Kurve g stets nur tangential.In the present example, the curve se is determined by means of an ellipse whose main axes define the vertical and horizontal distance. In addition, the ellipse also sets the minimum distances in the angles deviating from the horizontal and the vertical angles. In other words, if the ellipse with its midpoint along the curve se is moved, it always touches the curve g only tangentially.
Gleiches gilt selbstverständlich, wenn die Ellipse über die gemessene Kurve g verschoben wird. Die Sollverstärkungskurve se schneidet dann die Ellipse nie.The same applies, of course, when the ellipse is moved over the measured curve g. The desired gain curve SE then never intersects the ellipse.
Anstelle einer Ellipse könnte zur Ermittlung des Sollverstärkungsfrequenzgangs se auch ein Kreis oder ein anderes Gebilde bzw. eine andere Funktion verwendet werden. Ein Kreis würde beispielsweise einen Orthogonalabstand zwischen den beiden Kurven g und se sicherstellen.Instead of an ellipse, a circle or another structure or another function could be used to determine the desired amplification frequency response se. For example, a circle would ensure an orthogonal distance between the two curves g and se.
In dem oben dargestellten Beispiel ist der Minimalabstand der beiden Frequenzgänge über dem gesamten Frequenzbereich auf die gleiche Weise ermittelt. Entsprechend einer alternativen Ausführungsform kann der Abstand in ein oder mehreren Teilen des Frequenzbereichs mit unterschiedlichen Methoden festgelegt werden. Beispielsweise könnte der Abstand im niederen Frequenzbereich, wo kaum Resonanzen zu erwarten sind, verhältnismäßig niedrig und im höheren Frequenzbereich entsprechend höher gewählt werden.In the example shown above, the minimum distance of the two frequency responses over the entire frequency range is determined in the same way. According to an alternative embodiment, the distance may be set in one or more parts of the frequency range by different methods. For example, the distance in the low frequency range, where hardly any resonances are to be expected, could be chosen to be relatively low and correspondingly higher in the higher frequency range.
Ein wesentlicher Vorteil der erfindungsgemäßen Wahl des Sollverstärkungsfrequenzgangs ist, dass der vertikale Abstand zum Grenzverstärkungsfrequenzgang eventuell nicht so groß ausfallen muss, da im Fall einer reinen vertikalen Beabstandung entsprechend der Kurve sv für die Erreichung eines genügenden Horizontalabstands der vertikale Abstand wesentlich größer sein müsste.A significant advantage of the inventive choice of the target gain frequency response is that the vertical distance to Grenzverstärkungsfrequenzgang may not be so large, since in the case of a pure vertical spacing corresponding to the curve sv for achieving a sufficient horizontal distance, the vertical distance would be much greater.
Claims (10)
- Method for amplification of an acoustic signal, especially for a hearing aid, by- picking up a limit gain frequency response (g) of the amplification device which represents the limit for feedback whistling,characterized by- creation of a required gain frequency response (se) with a number of interpolation points, in which each interpolation point has a minimum distance to the limit gain frequency response in at least two different directions in the gain frequency diagram.
- Method according to claim 1, with the relevant minimum distance of the required gain frequency response (se) being predetermined by the limit gain frequency response (g) in the horizontal and vertical direction.
- Method in accordance with claim 1 or 2, with the distance between required gain frequency response (se) and limit gain frequency response (g) being determined, in at least a part area of the frequency response, with the aid of an ellipse of which the center point defines the curve of the required gain frequency response if it is shifted along the curve of the limit gain frequency response and always touches the curve in this case.
- Method in accordance with claim 1 or 2, with the distance between required gain frequency response (se) and limit gain frequency response (g) being determined, in at least a part area of the frequency response, with the aid of a circle of which the center point is shifted on the curve of the required gain frequency response and in this case always touches the curve of the limit gain frequency response (g).
- Method in accordance with one of the previous claims, with the distance between required gain frequency response (se) and limit gain frequency response (g) being set differently in at least two frequency ranges.
- Acoustic system with- an amplification device and- a pickup device for picking up a limit gain frequency response (g) of the amplification device which represents the limit of the feedback whistling,characterized by- a processing device for creating a required gain frequency response (se) with a number of interpolation points, with each interpolation point having a minimum distance to the limit gain frequency response (g) in at least two different directions in the gain-frequency diagram and for feeding the required gain frequency response into the amplification device.
- Acoustic system in accordance with claim 6, with the relevant minimum distance of the required gain frequency response (se) from the limit gain frequency response (g) in the horizontal and vertical direction being able to be predetermined in the processing device.
- Acoustic system in accordance with claim 6 or 7, with the distance between the required gain frequency response (se) and the limit gain frequency response (g) at least in a part area of the frequency response, being able to be determined with the aid of an ellipse of which the center point can be shifted on the curve of the required gain frequency response (se) and which in this case always touches the curve of the limit gain frequency response (g).
- Acoustic system in accordance with claim 6 or 7, with the distance between the required gain frequency response (se) and the limit gain frequency response (g) at least in a part area of the frequency response, being able to be determined with the aid of a circle of which the center point can be shifted on the curve of the required gain frequency response (se) and which in this case always touches the curve of the limit gain frequency response (g).
- Acoustic system in accordance with one of the claims 6 to 9, with the distance between the required gain frequency response (se) and the limit gain frequency response (g) being able to be set differently in at least two frequency ranges with the aid of the processing unit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004053776A DE102004053776B4 (en) | 2004-11-08 | 2004-11-08 | Method for amplifying an acoustic signal and corresponding acoustic system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1655997A2 EP1655997A2 (en) | 2006-05-10 |
| EP1655997A3 EP1655997A3 (en) | 2009-05-27 |
| EP1655997B1 true EP1655997B1 (en) | 2009-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05109472A Active EP1655997B1 (en) | 2004-11-08 | 2005-10-12 | Method for amplifying an acoustic signal and corresponding acoustic system |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8050436B2 (en) |
| EP (1) | EP1655997B1 (en) |
| DE (2) | DE102004053776B4 (en) |
| DK (1) | DK1655997T3 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009014540A1 (en) * | 2009-03-24 | 2010-10-07 | Siemens Medical Instruments Pte. Ltd. | Method for operating a hearing device with increased feedback compensation and hearing device |
| US9179222B2 (en) | 2013-06-06 | 2015-11-03 | Cochlear Limited | Signal processing for hearing prostheses |
| US9763006B2 (en) | 2015-03-26 | 2017-09-12 | International Business Machines Corporation | Noise reduction in a microphone using vowel detection |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3205686A1 (en) * | 1982-02-17 | 1983-08-25 | Robert Bosch Gmbh, 7000 Stuttgart | HOERGERAET |
| US5533120A (en) * | 1994-02-01 | 1996-07-02 | Tandy Corporation | Acoustic feedback cancellation for equalized amplifying systems |
| US6434246B1 (en) * | 1995-10-10 | 2002-08-13 | Gn Resound As | Apparatus and methods for combining audio compression and feedback cancellation in a hearing aid |
| WO1998047314A2 (en) * | 1997-04-16 | 1998-10-22 | Dspfactory Ltd. | Apparatus for and method of programming a digital hearing aid |
| US6876751B1 (en) * | 1998-09-30 | 2005-04-05 | House Ear Institute | Band-limited adaptive feedback canceller for hearing aids |
| US7058182B2 (en) * | 1999-10-06 | 2006-06-06 | Gn Resound A/S | Apparatus and methods for hearing aid performance measurement, fitting, and initialization |
| DE10131964B4 (en) * | 2001-07-02 | 2005-11-03 | Siemens Audiologische Technik Gmbh | Method for operating a digital programmable hearing aid and digital programmable hearing aid |
| DE10159928A1 (en) * | 2001-12-06 | 2003-05-08 | Siemens Audiologische Technik | Preventing oscillations in hearing aid caused by feedback involves reducing gain for lower input signal levels if oscillations detected, reducing it to lesser extent or not at all for higher levels |
| DE10244184B3 (en) * | 2002-09-23 | 2004-04-15 | Siemens Audiologische Technik Gmbh | Feedback compensation for hearing aids with system distance estimation |
| US7430299B2 (en) * | 2003-04-10 | 2008-09-30 | Sound Design Technologies, Ltd. | System and method for transmitting audio via a serial data port in a hearing instrument |
| US7609841B2 (en) * | 2003-08-04 | 2009-10-27 | House Ear Institute | Frequency shifter for use in adaptive feedback cancellers for hearing aids |
| US7519193B2 (en) * | 2003-09-03 | 2009-04-14 | Resistance Technology, Inc. | Hearing aid circuit reducing feedback |
| US7386142B2 (en) * | 2004-05-27 | 2008-06-10 | Starkey Laboratories, Inc. | Method and apparatus for a hearing assistance system with adaptive bulk delay |
-
2004
- 2004-11-08 DE DE102004053776A patent/DE102004053776B4/en not_active Expired - Fee Related
-
2005
- 2005-10-12 EP EP05109472A patent/EP1655997B1/en active Active
- 2005-10-12 DK DK05109472.0T patent/DK1655997T3/en active
- 2005-10-12 DE DE502005008776T patent/DE502005008776D1/en active Active
- 2005-10-31 US US11/263,342 patent/US8050436B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP1655997A2 (en) | 2006-05-10 |
| DE502005008776D1 (en) | 2010-02-11 |
| US20060098832A1 (en) | 2006-05-11 |
| EP1655997A3 (en) | 2009-05-27 |
| DK1655997T3 (en) | 2010-05-03 |
| DE102004053776B4 (en) | 2007-10-31 |
| DE102004053776A1 (en) | 2006-05-11 |
| US8050436B2 (en) | 2011-11-01 |
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