CA2425180A1 - Method for processing an input signal for producing an output signal and an application of said method in hearing aids and devices - Google Patents
Method for processing an input signal for producing an output signal and an application of said method in hearing aids and devices Download PDFInfo
- Publication number
- CA2425180A1 CA2425180A1 CA002425180A CA2425180A CA2425180A1 CA 2425180 A1 CA2425180 A1 CA 2425180A1 CA 002425180 A CA002425180 A CA 002425180A CA 2425180 A CA2425180 A CA 2425180A CA 2425180 A1 CA2425180 A1 CA 2425180A1
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- Prior art keywords
- threshold value
- level
- input signal
- max
- hearing
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Classifications
-
- 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
- H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
- H04R25/356—Amplitude, e.g. amplitude shift or compression
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
Abstract
The invention relates to a method and a device for determining a threshold value (Omax, Omin, OTR) for limiting an output signal of a processing unit to which an input signal is delivered. According to the invention, a level of the input signal is determined and the threshold value (Omax, Omin, OTR) is adjusted in accordance with this level. The adjustment of the threshold value according to the level of the input signal, i.e. the adaptive adjustment of the threshold value, enables transient noises at a level clearly below the maximum value for the threshold value to be limited as well. The use of the inventive method and the inventive device in a hearing aid can therefore significantly increase the comfort of the wearer.
Description
METHOD FOR PROCESSING AN INPUT SIGNAL FOR PRODUCING AN
OUTPUT SIGNAL AND AN APPLICATION OF SAID
METHOD IN HEARING AIDS AND DEVICES
The present invention relates to a method for processing an input signal to generate an output signal, and to applications of that method in hearing aids and listening devices.
So-called transient limiters are signal processing units which are capable, t~rithout any.delay or overshoot, of limiting rapidly ramping, short-duration i.e. transient signal~components to a predefined level, hereinafter referred to as the threshold value. The threshold value concerned, at which the transient limiter performs its function, is not signal-deper_dent but can ,instead be set as a parameter.
Transient limiters are employed for instance in hearing devices which serve to compensate for a patient's hearing impairment, but also ir~ auditory amplification systems which are used for enhancing audibility in special situations such as listening and monitoring operations. In the following description the te=m "hearing device" is to be understood as ccmpre'r:ensi vel y referrir:g to the medical fleaT_'1ng aldS a~d t0 the .llSt~r~lIlC~ deVlCeS mAntlOn2d abOiJe.
rnihere any of the following elucidations relate uniquely to applications in listening devices, they will be expli~citiy identified as such.
_ 7 _ In hearing devices, transient limn ers serve the purpose ef preventing the maximum output level in the hearing device from exceeding a predefined threshold value. This protects tree user of the hearing de,Tice from excessive noise exposure.
It is a known fact that human speech occupies a dynamic range of about -15 to +18 di3 (decibels) around the respective mean level, which is about 60 to 65 dB in quiet surroundings with little ambient noise. In loud surroundings, the mean level can rise to about 80 dB or higher. Given these facts, the conventional methods for limiting the audio signal components for persons with normal hearing have employed fixed maximum values of 100 to 120 dB. In cases of diminished hearing capacity, the threshold value is suitably set at a comfortable maximum level below the threshold of pair, for t~~e patient or user.
It is a characteristic aspect of human auditory perception that not only sound levels above the maximum threshold value or comfort level are bothersome. Indeed, it is also transient sounds (such as interm?tten~ noise), even when at a level distinctly below the maximum threshold value, that are perceived as unpleasant in an otherwise prevalentlj.;
quiet environment. For example, in quiet surroundings, the transient noise of dishes and cutlery, even ii w?11 below the maximum threSholG Value of lOC to 120 d3, creates ar.
unpleasant auditory sensation It is therefore the object of the present invention to introduce a method by which the aforementioned problems are at;oided.
This object is achieJed by means of the measures specified in the c'_naracterizing part of claim 1. Additional claims cover advantageous embodiments of the present invention as well as various applications of said method.
By setting the threshold value as a function of the level of the input signal, i.e. adaptively, it is possible to limit even transient noise whose level is well below the maximum threshold value, thus permitting a significantly greater hearing comfort for the wearer of the hearing device.
The following explains the present invention in more detail with the aid of a drawing showing an example. The only figure shows a course of an effective threshold, selected according to the present invention, as a function of a given level of the input signal.
The method accordir_g to the present invention and its various applications a=a explained based on the course of an adjustable threshold values shown in tr:e only figure as a fur_ction of a given input signal I. This is with initial refer?nce to a person with normal hearing.
In the figure, GO represents the curve of the threshold val ue set accordir._g to the present inure ticn and indicated by a solid line. GS represents the median curve of the 1a=gel of an input signal, indicated by a das:-dotted lira.
The method according to the present invention continuously determines a threshold value 0 which, when. necessary i.e.
when the level of the input signal is too high, serves as the limiting parameter. To that effect the respective momentary threshold value 0 is a function of the level I of the input signal. It follows that the thresho'_d value which serves to limit the level of the input signal is continuously adapted to the varying, momentarily prevailing auditory conditions; in other words, the threshold value is adjusted in adaptive fashion.
The threshold value O can be set by first defir_ing a momentary mean level I of the input signal. This may be accomplished for instance by the following approach:
I = ~ ~ f I s(t)I ~ dt U
Calculated along t'r,is formula is a time-based mean value I
across the magnitude of the input signal s(t), with the averaging performed over a time 'nterval T which may be a t~m~ span of for instance 5 seconds. The formula showy. can be applied dl rectl_.i to a:~alog sir stems. From it, the e:;pert car_ easily derive a corresponding formula for digital systems.
In another embodiment of Lne method according to t'r~e p resent inVenti Cn, the aTrerage or mean level I of the input sigr_al s(t) car. be determined strictly on the basis of ambient noise without factoring in any voice signals cf interest.
To avoid clipping any voice or speech signals, the invention further proposes to set tr.e momentary threshold value 0 at a point higher by a differential amount TR~z;
than the mean level I. The momentary threshold value is preferably set twenty decibels (dB) above that mean or average level I so that, given the aforementioned dynamic range of voice signals which straddles the mean level from about -i5 dB to +18 dB, any voice limitation is prevented.
In the diagram, Im represents a mean level cf the input signal, calculated by the formula shown above. Based on the value for the level I;~ a threshold value OT4 is set which can be determined by adding a mean output signal Om to the differential amount TP,ma;t. The determination according to the presant invention of the momentary threshold value OTC
provi des sigr_ificar.tly greater heari ng comfort for the Wearer of the hearing device for as long aS the mean level I remains wi t'rai r. an inter val cf I, to T~ . If a mean le~rel I
Of the 1!lp~,ll. Signal Were t0 'L'o Set at ab0'T2 tile 12Ve1 I
and the method according to the present invention as described thus far is applied, the resulting level of the output sigr_al would be above the threshold of pain.
COiw2rSely, if the mean level I cf the input signal were to be set at 'IJclOtnl the level I, a_~d the m?thod acording to the present rove=:tior: as described thus far is applied, it would pose the rise of at least the first few spo'.ten syllables being clipped, i.e. limited, before the mean level I regains higher values.
Therefore, to prevent the effective threshold value O from rising too high in the case of noisy surroundings, another form of implementation of the method accord-ng to the present invention provides for the establishment of a maximum threshold value O;~a;~, treat value preferably being 120 dB. In the diagram this is expressed by a horizontal progression of the curve GO of the threshold value at Om3.
Further to the above, another form of implementation of this method provides for the setting of a minimum threshold value Oniz, for the following reason: In quiet surroundings the mean level I quickly drops to values below 45 dB. That would swallow up, i.e. limit, at least any first spoken syllable before the mean level I has returned to 60 d8.
This can be avoided by setting a minimum threshold value Or,=,, preferably at 80 dB, which then ccr_stitute~ the lowest acceptable level. Ths diagram again shows a horizentai progression of the curve GO of the threshold T:alue at O~,yn.
As was pointed cut further above, the description so far given is based on the application of the method according to the present invention in t.~e hearing device, i.e.
lister:ing device, for a person with normal hearing. N~here the method according to the present invention is applla~a in the hearing device of a hearing-impaired person, a - 7 _ corresponding adaptation of the numerical parameters is necessary.
The followi ng implementation examples of the :~:et~~.od according to the present invention are specifically aimed at listening device-type hearing devices:
The minimum threshold value O;t,;.n is amplified b_,j a gain factor averaged Over the applicable range. At the same time the maximum value O~,a;~ for the threshold value 0 is adjusted to the upper comfort level (UCL) of the person concerned.
In addition, the differential amount TR;~a:; is adjusted to a user-specific compression ratio. In comprehensive terms, the parameters involved, these being the minimum threshold value O;~iz, the maximum value Oma_t for the threshold val ue 0 and the differential amount TRma:<, are converted into output-specific values. Bepending on the fitting function employed, this involves an input-level-dependent amplification of the values O~;ii, and O;~aa and a corresponding compression factor for TRma;s. Typical compression factors range from 1 (one), meaning no compression, to four (4).
Another form of impiementaticr_ provi-des for a soft or a hard limitation of the input signals. In the case of a hard ?5 limitation the output signal, with the correct sign, is limited to t'r:e respective level of the threshold value not until that is about to be e:zceeded. The limit can be viewed as a compression factor of infinite magnitude. In the case of a soft limitation an increasingly larger compression 3tJ favtOr is applied even before the threshold value is reached. The concomitant distortion causes any harmonics to urea',ten, the signal form to look "rounder" and the si final thus limited to have a more pleasaa sound.
OUTPUT SIGNAL AND AN APPLICATION OF SAID
METHOD IN HEARING AIDS AND DEVICES
The present invention relates to a method for processing an input signal to generate an output signal, and to applications of that method in hearing aids and listening devices.
So-called transient limiters are signal processing units which are capable, t~rithout any.delay or overshoot, of limiting rapidly ramping, short-duration i.e. transient signal~components to a predefined level, hereinafter referred to as the threshold value. The threshold value concerned, at which the transient limiter performs its function, is not signal-deper_dent but can ,instead be set as a parameter.
Transient limiters are employed for instance in hearing devices which serve to compensate for a patient's hearing impairment, but also ir~ auditory amplification systems which are used for enhancing audibility in special situations such as listening and monitoring operations. In the following description the te=m "hearing device" is to be understood as ccmpre'r:ensi vel y referrir:g to the medical fleaT_'1ng aldS a~d t0 the .llSt~r~lIlC~ deVlCeS mAntlOn2d abOiJe.
rnihere any of the following elucidations relate uniquely to applications in listening devices, they will be expli~citiy identified as such.
_ 7 _ In hearing devices, transient limn ers serve the purpose ef preventing the maximum output level in the hearing device from exceeding a predefined threshold value. This protects tree user of the hearing de,Tice from excessive noise exposure.
It is a known fact that human speech occupies a dynamic range of about -15 to +18 di3 (decibels) around the respective mean level, which is about 60 to 65 dB in quiet surroundings with little ambient noise. In loud surroundings, the mean level can rise to about 80 dB or higher. Given these facts, the conventional methods for limiting the audio signal components for persons with normal hearing have employed fixed maximum values of 100 to 120 dB. In cases of diminished hearing capacity, the threshold value is suitably set at a comfortable maximum level below the threshold of pair, for t~~e patient or user.
It is a characteristic aspect of human auditory perception that not only sound levels above the maximum threshold value or comfort level are bothersome. Indeed, it is also transient sounds (such as interm?tten~ noise), even when at a level distinctly below the maximum threshold value, that are perceived as unpleasant in an otherwise prevalentlj.;
quiet environment. For example, in quiet surroundings, the transient noise of dishes and cutlery, even ii w?11 below the maximum threSholG Value of lOC to 120 d3, creates ar.
unpleasant auditory sensation It is therefore the object of the present invention to introduce a method by which the aforementioned problems are at;oided.
This object is achieJed by means of the measures specified in the c'_naracterizing part of claim 1. Additional claims cover advantageous embodiments of the present invention as well as various applications of said method.
By setting the threshold value as a function of the level of the input signal, i.e. adaptively, it is possible to limit even transient noise whose level is well below the maximum threshold value, thus permitting a significantly greater hearing comfort for the wearer of the hearing device.
The following explains the present invention in more detail with the aid of a drawing showing an example. The only figure shows a course of an effective threshold, selected according to the present invention, as a function of a given level of the input signal.
The method accordir_g to the present invention and its various applications a=a explained based on the course of an adjustable threshold values shown in tr:e only figure as a fur_ction of a given input signal I. This is with initial refer?nce to a person with normal hearing.
In the figure, GO represents the curve of the threshold val ue set accordir._g to the present inure ticn and indicated by a solid line. GS represents the median curve of the 1a=gel of an input signal, indicated by a das:-dotted lira.
The method according to the present invention continuously determines a threshold value 0 which, when. necessary i.e.
when the level of the input signal is too high, serves as the limiting parameter. To that effect the respective momentary threshold value 0 is a function of the level I of the input signal. It follows that the thresho'_d value which serves to limit the level of the input signal is continuously adapted to the varying, momentarily prevailing auditory conditions; in other words, the threshold value is adjusted in adaptive fashion.
The threshold value O can be set by first defir_ing a momentary mean level I of the input signal. This may be accomplished for instance by the following approach:
I = ~ ~ f I s(t)I ~ dt U
Calculated along t'r,is formula is a time-based mean value I
across the magnitude of the input signal s(t), with the averaging performed over a time 'nterval T which may be a t~m~ span of for instance 5 seconds. The formula showy. can be applied dl rectl_.i to a:~alog sir stems. From it, the e:;pert car_ easily derive a corresponding formula for digital systems.
In another embodiment of Lne method according to t'r~e p resent inVenti Cn, the aTrerage or mean level I of the input sigr_al s(t) car. be determined strictly on the basis of ambient noise without factoring in any voice signals cf interest.
To avoid clipping any voice or speech signals, the invention further proposes to set tr.e momentary threshold value 0 at a point higher by a differential amount TR~z;
than the mean level I. The momentary threshold value is preferably set twenty decibels (dB) above that mean or average level I so that, given the aforementioned dynamic range of voice signals which straddles the mean level from about -i5 dB to +18 dB, any voice limitation is prevented.
In the diagram, Im represents a mean level cf the input signal, calculated by the formula shown above. Based on the value for the level I;~ a threshold value OT4 is set which can be determined by adding a mean output signal Om to the differential amount TP,ma;t. The determination according to the presant invention of the momentary threshold value OTC
provi des sigr_ificar.tly greater heari ng comfort for the Wearer of the hearing device for as long aS the mean level I remains wi t'rai r. an inter val cf I, to T~ . If a mean le~rel I
Of the 1!lp~,ll. Signal Were t0 'L'o Set at ab0'T2 tile 12Ve1 I
and the method according to the present invention as described thus far is applied, the resulting level of the output sigr_al would be above the threshold of pain.
COiw2rSely, if the mean level I cf the input signal were to be set at 'IJclOtnl the level I, a_~d the m?thod acording to the present rove=:tior: as described thus far is applied, it would pose the rise of at least the first few spo'.ten syllables being clipped, i.e. limited, before the mean level I regains higher values.
Therefore, to prevent the effective threshold value O from rising too high in the case of noisy surroundings, another form of implementation of the method accord-ng to the present invention provides for the establishment of a maximum threshold value O;~a;~, treat value preferably being 120 dB. In the diagram this is expressed by a horizontal progression of the curve GO of the threshold value at Om3.
Further to the above, another form of implementation of this method provides for the setting of a minimum threshold value Oniz, for the following reason: In quiet surroundings the mean level I quickly drops to values below 45 dB. That would swallow up, i.e. limit, at least any first spoken syllable before the mean level I has returned to 60 d8.
This can be avoided by setting a minimum threshold value Or,=,, preferably at 80 dB, which then ccr_stitute~ the lowest acceptable level. Ths diagram again shows a horizentai progression of the curve GO of the threshold T:alue at O~,yn.
As was pointed cut further above, the description so far given is based on the application of the method according to the present invention in t.~e hearing device, i.e.
lister:ing device, for a person with normal hearing. N~here the method according to the present invention is applla~a in the hearing device of a hearing-impaired person, a - 7 _ corresponding adaptation of the numerical parameters is necessary.
The followi ng implementation examples of the :~:et~~.od according to the present invention are specifically aimed at listening device-type hearing devices:
The minimum threshold value O;t,;.n is amplified b_,j a gain factor averaged Over the applicable range. At the same time the maximum value O~,a;~ for the threshold value 0 is adjusted to the upper comfort level (UCL) of the person concerned.
In addition, the differential amount TR;~a:; is adjusted to a user-specific compression ratio. In comprehensive terms, the parameters involved, these being the minimum threshold value O;~iz, the maximum value Oma_t for the threshold val ue 0 and the differential amount TRma:<, are converted into output-specific values. Bepending on the fitting function employed, this involves an input-level-dependent amplification of the values O~;ii, and O;~aa and a corresponding compression factor for TRma;s. Typical compression factors range from 1 (one), meaning no compression, to four (4).
Another form of impiementaticr_ provi-des for a soft or a hard limitation of the input signals. In the case of a hard ?5 limitation the output signal, with the correct sign, is limited to t'r:e respective level of the threshold value not until that is about to be e:zceeded. The limit can be viewed as a compression factor of infinite magnitude. In the case of a soft limitation an increasingly larger compression 3tJ favtOr is applied even before the threshold value is reached. The concomitant distortion causes any harmonics to urea',ten, the signal form to look "rounder" and the si final thus limited to have a more pleasaa sound.
Claims (20)
1. Method for determining a threshold value (O max, O min, O TR) serving to limit the output signal of a processing unit into which an input signal has been fed, characterized in that the level of the input signal is determined and that the threshold value (O max, O min, O TR) is set as a function of that level of the input signal.
2. Method according to claim 1, characterized in that from the said level a meat level (I) is derived on the basis of which the threshold value (O max, O min, O TR) is set, with preferably only ambient noise contained in the input signal being factored in.
3. Method according to claim 2, characterized in that the threshold value (O TR) is set by a differential amount (TR max) above the mean level (I) of the input signal, said differential amount (TR max) preferably being equal to twenty decibels.
4. Method according to claim 2, characterized in that the mean level (I) is derived from the input signal s(t) along the following formula:
whereby an averaging function is performed over a time interval T having a duration of preferably five seconds.
whereby an averaging function is performed over a time interval T having a duration of preferably five seconds.
5. Method according to one of the claims 1 to 4, characterized in that a maximum threshold value (O max) is established.
6. Method according to claim 5, characterized in that the maximum threshold value (O max) is so selected as to be equal to an upper comfort level of a hearing-impaired person.
7. Method according to one of the claims 1 to 6, characterized in that a minimum threshold value (O min) is established.
8. Method according to claim 7, characterized in that the minimum threshold value (O min) is so selected as to be equal to an output level that results from an input level of preferably 80 dB and the corresponding amplification at that input level that is produced for a hearing-impaired person.
9. Method according to one of the claims 2 to 8, characterized in that the differential amount (TR max) is adjusted along a compression ratio for a hearing-impaired person.
10. Use of the method according to one of the claims 1 to 9 for operating a hearing device.
11. Use of the method according to one of the claims 6, 8 or 9 for operation of a hearing device by a hearing-impaired person.
12. Apparatus for implementing the method according to one of the clams 1 to 9, characterized in that a processing unit is provided which receives an input signal and which permits within the processing unit the determination of a threshold value (O max, O min, O TR) for the purpose of limiting the output signal, said threshold value (O max, O min O TR) being adjustable as a function of the level of the input signal.
13. Apparatus according to claim 12, characterized in that from the level of the input signal a mean level (I) can be determined by averaging, preferably derived only from the ambient noise contained in the input signal.
14. Apparatus according to claim 12 or 13, characterized in that the threshold value (O TR) is adjustable to a point which is above the mean level (I) of the input signal by a differential amount (TR max), said differential amount (TR max) preferably being canal to twenty decibels.
15. Apparatus according to claim 14, characterized in that the mean level (I) can be derived from the input signal s(t) by employing the following formula:
where an averaging function can be performed over a time interval T with a duration of preferably five seconds.
where an averaging function can be performed over a time interval T with a duration of preferably five seconds.
16. Apparatus according to one of the claims 12 to 15, characterized in that it permits a maximum threshold value (O max) to be established.
17. Apparatus according to claim 16, characterized in that the maximum threshold value (O max) is selectable to be equal to the upper comfort level of a hearing-impaired person.
18. Apparatus according to one of the claims 12 to 17, characterized in that it permits a minimum threshold value (O min) to be established.
19. Apparatus according to claim 18, characterized in that the minimum threshold value (O min) is selectable a to be equal to the mean amplification value for a hearing-impaired person.
20. Apparatus according to one of the claims 13 to 19, characterized in that the differential amount (TR max) can be adjusted corresponding to the compression ratio for a hearing-impaired person.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CH2001/000484 WO2001076063A2 (en) | 2001-08-08 | 2001-08-08 | Method for processing an input signal for producing an output signal and an application of said method in hearing aids and devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2425180A1 true CA2425180A1 (en) | 2003-04-07 |
Family
ID=4358231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002425180A Abandoned CA2425180A1 (en) | 2001-08-08 | 2001-08-08 | Method for processing an input signal for producing an output signal and an application of said method in hearing aids and devices |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1415393B1 (en) |
| JP (1) | JP2004524714A (en) |
| AU (2) | AU7623001A (en) |
| CA (1) | CA2425180A1 (en) |
| DE (1) | DE50115477D1 (en) |
| DK (1) | DK1415393T3 (en) |
| WO (1) | WO2001076063A2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1351550B1 (en) * | 2002-09-10 | 2010-11-10 | Phonak Ag | Method for adapting a signal amplification in a hearing aid and a hearing aid |
| EP1689210B1 (en) * | 2006-05-10 | 2008-03-26 | Phonak AG | Hearing device |
| US8213653B2 (en) | 2006-05-10 | 2012-07-03 | Phonak Ag | Hearing device |
| EP1773099A1 (en) * | 2006-05-30 | 2007-04-11 | Phonak AG | Method and system for providing hearing assistance to a user |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5119482B2 (en) * | 1972-10-12 | 1976-06-17 | ||
| US4208548A (en) * | 1977-07-19 | 1980-06-17 | Orban Associates, Inc. | Apparatus and method for peak-limiting audio frequency signals |
| GB1599401A (en) * | 1978-04-18 | 1981-09-30 | Nat Res Dev | Input signal level control for communications channels |
| US4182993A (en) * | 1978-11-02 | 1980-01-08 | Dbx Inc. | Signal amplitude compression system |
| JPH08317496A (en) * | 1995-05-19 | 1996-11-29 | Hitachi Ltd | Digital sound signal processor |
| JPH10200996A (en) * | 1997-01-09 | 1998-07-31 | Matsushita Electric Ind Co Ltd | Hearing aid and method for adjusting it |
| JP3908833B2 (en) * | 1997-08-22 | 2007-04-25 | ソニー株式会社 | Audio processing device |
| CA2316242C (en) * | 1997-12-23 | 2003-10-28 | Topholm & Westermann Aps | Dynamic automatic gain control in a hearing aid |
| JPH11225398A (en) * | 1998-02-05 | 1999-08-17 | Matsushita Electric Ind Co Ltd | Loudness adjusting method and hearing aid |
| AU4278300A (en) * | 1999-04-26 | 2000-11-10 | Dspfactory Ltd. | Loudness normalization control for a digital hearing aid |
| JP3894695B2 (en) * | 2000-01-21 | 2007-03-22 | 松下電器産業株式会社 | Hearing aid adjustment device and hearing aid |
-
2001
- 2001-08-08 WO PCT/CH2001/000484 patent/WO2001076063A2/en active Application Filing
- 2001-08-08 DE DE50115477T patent/DE50115477D1/en not_active Expired - Lifetime
- 2001-08-08 AU AU7623001A patent/AU7623001A/en active Pending
- 2001-08-08 DK DK01953739.8T patent/DK1415393T3/en active
- 2001-08-08 CA CA002425180A patent/CA2425180A1/en not_active Abandoned
- 2001-08-08 JP JP2001573628A patent/JP2004524714A/en active Pending
- 2001-08-08 AU AU2001276230A patent/AU2001276230B9/en not_active Expired
- 2001-08-08 EP EP01953739A patent/EP1415393B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE50115477D1 (en) | 2010-06-17 |
| AU2001276230B9 (en) | 2008-06-19 |
| AU7623001A (en) | 2001-10-15 |
| WO2001076063A3 (en) | 2002-09-26 |
| WO2001076063A9 (en) | 2002-07-18 |
| EP1415393B1 (en) | 2010-05-05 |
| WO2001076063A2 (en) | 2001-10-11 |
| AU2001276230B2 (en) | 2008-01-10 |
| EP1415393A2 (en) | 2004-05-06 |
| JP2004524714A (en) | 2004-08-12 |
| DK1415393T3 (en) | 2010-08-30 |
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