AU2001276230B2 - 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 PDF

Info

Publication number
AU2001276230B2
AU2001276230B2 AU2001276230A AU2001276230A AU2001276230B2 AU 2001276230 B2 AU2001276230 B2 AU 2001276230B2 AU 2001276230 A AU2001276230 A AU 2001276230A AU 2001276230 A AU2001276230 A AU 2001276230A AU 2001276230 B2 AU2001276230 B2 AU 2001276230B2
Authority
AU
Australia
Prior art keywords
threshold value
value
output signal
input signal
level
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
Application number
AU2001276230A
Other versions
AU2001276230A1 (en
AU2001276230B9 (en
Inventor
Hans-Ueli Roeck
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.)
Sonova Holding AG
Original Assignee
Phonak 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 Phonak AG filed Critical Phonak AG
Publication of AU2001276230A1 publication Critical patent/AU2001276230A1/en
Application granted granted Critical
Publication of AU2001276230B2 publication Critical patent/AU2001276230B2/en
Publication of AU2001276230B9 publication Critical patent/AU2001276230B9/en
Anticipated expiration legal-status Critical
Expired legal-status Critical Current

Links

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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Description

2 METHOD FOR PROCESSING AN INPUT SIGNAL TO GENERATE AN OUTPUT SIGNAL AS WELL AS A USE OF SAID METHOD IN A HEARING DEVICE OR IN A HEARING AID 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, without 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-dependent 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 in auditory amplification systems which are used for enhancing audibility in special situations such as listening and monitoring operations. In the following description the term "hearing device" is to be understood as comprehensively referring to the medical hearing aids and to the listening devices mentioned above.
Where any of the following elucidations relate uniquely to applications in listening devices, they will be explicitly identified as such.
H:\jeI\Kccp\Sped\2OO05\2001276230. DOC 6/09105 3 In hearing devices, transient limiters serve the purpose of preventing the maximum output level in the hearing device from exceeding a predefined threshold value. This protects the user of the hearing device from excessive noise exposure.
It is a known fact that human speech occupies a dynamic range of about -15 to +18 dB (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 pain for the 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 intermittent noise), even when at a level distinctly below the maximum threshold value, that are perceived as unpleasant in an otherwise prevalently quiet environment. For example, in quiet surroundings, the transient noise of dishes and cutlery, even if well below the maximum threshold value of 100 to 120 dB, creates an unpleasant auditory sensation.
H:\jamn\Kcp\SpeciU2005\20276230. DOC 6/09/D5 4 C According to one aspect of the present invention there is Uprovided a method for determining a threshold value in a hearing device, the threshold value serving to limit an output signal of a processing unit into which an input signal, has been fed, the method comprising the steps of: determining a mean value, I, of a level of the C( input signal in the hearing device; adjusting the threshold value as a function of 10 the mean value; and Slimiting the output signal in the hearing device Cl by applying the threshold value, wherein the threshold value is adjusted independently of the output signal, wherein the threshold value is adjusted to an upper value which is equal to the mean level of the input signal plus a preset difference, the output signal being limited by applying the upper value in case the output signal would be higher than the upper value.
According to another aspect of the present invention there is provided a method for determining a threshold value in a hearing device, the threshold value serving to limit an output signal of a processing unit into which an input signal, has been fed, the method comprising the steps of: determining a mean value, I, of a level of the input signal in the hearing device; adjusting the threshold value as a function of the main value; and limiting the output signal in the hearing device by applying the threshold value, wherein the threshold value is adjusted independently of the output signal, wherein the threshold value is adjusted to an upper value which is equal to the mean value plus a preset difference, the output signal being limited by applying the upper value in case the output signal would be higher than the upper value, and wherein the threshold value is always 4a C greater than or equal to a predetermined minimum threshold Uvalue.
MAccording to another aspect of the present invention there is provided a method for determining a threshold value in a hearing device, the threshold value serving to limit the output signal of a processing unit into which an input signal has been fed, the method comprising the steps of: determining a mean value, I, of a level of the Sinput signal in the hearing device; adjusting the threshold value as a function of the main value; and limiting the output signal in the hearing device by applying the threshold value, wherein the threshold value is adjusted independently of the output signal, wherein the threshold value is always greater than or equal to a predetermined minimum threshold value.
According to another aspect of the present invention there is provided a system adapted to determine a threshold value in a hearing device, the threshold value serving to limit an output signal of a processing unit into which an input signal, has been fed, the system comprising: means for determining a mean value, I, of a level of the input signal in the hearing device; means for adjusting the threshold value as a function of the mean value, the threshold value being adjusted independently of the output signal; a processing unit which receives an input signal and is adapted to determine a threshold value for the purpose of limiting the output signal, said threshold value being adjustable as a function of the level of the input signal, and means for limiting the output signal in the hearing device by applying the threshold value, wherein the threshold value is adjusted to an upper value which is In an embodiment said time interval T has a duration of five seconds.
In an embodiment a maximum threshold value is established.
In an embodiment the maximum threshold value is selected to be equal to an upper comfort level of a hearing-impaired person.
In an embodiment a minimum threshold value is established.
In an embodiment the minimum threshold value is selected 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.
In an embodiment the differential amount is adjusted according to a compression ratio for a hearing-impaired person.
The invention also relates to an apparatus for implementing the above method comprising a processing unit which receives an input signal and which permits within the processing unit the determination of a threshold value for the purpose of limiting the output signal, said threshold value being adjustable as a function of the level of the input signal.
H:\janRKeep\Spec?200\2001276230.DOC 6/09/05 6 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 an embodiment of the present invention, as a function of a given level of the input signal.
The method according to an embodiment of the present invention and its various applications are explained based on the course of an adjustable threshold values shown in the only figure as a function of a given input signal I.
This is with initial reference to a person with normal hearing.
In the figure, GO represents the curve of the threshold value set according to the embodiment of the present invention and indicated by a solid line. GS represents the median curve of the level of an input signal, indicated by a dash-dotted line.
The method according to the embodiment of 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 H:\jancI\Kp\Speci2005\2001276230. DOC 6109/0S 7 that effect the respective momentary threshold value 0 is a function of the level I of the input signal. It follows that the threshold 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 0 can be set by first defining a momentary mean level I of the input signal. This may be accomplished for instance by the following approach: )s(t).d To Calculated along this formula is a time-based mean value I across the magnitude of the input signal with the averaging performed over a time interval T which may be a time span of for instance 5 seconds. The formula shown can be applied directly to analog systems. From it, the expert can easily derive a corresponding formula for digital systems.
In another embodiment of the method according to the present invention, the average or mean level I of the input signal s(t) can be determined strictly on the basis of ambient noise without factoring in any voice signals of interest.
To avoid clipping any voice or speech signals, the invention further proposes to set the momentary threshold H:\janlI\Kcep\Specik2OO5\200127623O.DOC 6/09/05 8 value 0 at a point higher by a differential amount TRa, 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 -15 dB to +18 dB, any voice limitation is prevented.
In the diagram, Im represents a mean level of the input signal, calculated by the formula shown above. Based on the value for the level Im a threshold value OTR is set which can be determined by adding a mean output signal ,Om to the differential amount TRW. The determination according to the present invention of the momentary threshold value OTR provides significantly greater hearing comfort for the wearer of the hearing device for as long as the mean level I remains within an interval of Il to 12. If a mean level I of the input signal were to be set at above the level 12 and the method according to the present invention as described thus far is applied, the resulting level of the output signal would be above the threshold of pain.
Conversely, if the mean level I of the input signal were to be set at below the level Ii and the method according to the present invention as described thus far is applied, it would pose the risk of at least the first few spoken syllables being clipped, i.e. limited, before the mean level I regains higher values.
Therefore, to prevent the effective threshold value 0 from rising too high in the case of noisy surroundings, another form of implementation of the method provides for the H:\janKeep\Spci'\205\200 127623O.D OC 6109/05 9 establishment of a maximum threshold value 0 that value preferably being 120 dB. In the diagram this is expressed by a horizontal progression of the curve GO of the threshold value at O..
Further to the above, another form of implementation of this method provides for the setting of a minimum threshold value Omin, 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 dB.
This can be avoided by setting a minimum threshold value Omin, preferably at 80 dB, which then constitutes the lowest acceptable level. The diagram again shows a horizontal progression of the curve GO of the threshold value at Om.
As was pointed out further above, the description so far given is based on the application of the method in a hearing device, i.e. listening device, for a person with normal hearing. Where the method is applied in the hearing device of a hearing-impaired person, a corresponding adaptation of the numerical parameters is necessary.
The following implementation examples of the method are specifically aimed at listening device-type hearing devices.
The minimum threshold value Omin is amplified by a gain factor averaged over the applicable range. At the same time the maximum value Oma for the threshold value 0 is adjusted H:\janel\IrpkSpeci\205l\2001276230.DOC 6/09/05 to the upper comfort level (UCL) of the person concerned.
In addition, the differential amount TRmax is adjusted to a
O
Suser-specific compression ratio. In comprehensive terms, 00 the parameters involved, these being the minimum threshold value Omin, the maximum value Omax for the threshold value 0 and the differential amount TRm,, are converted into M output-specific values. Depending on the fitting function O employed, this involves an input-level-dependent CI amplification of the values Omin and Omax and a corresponding compression factor for TRmax. Typical CI compression factors range from 1 (one), meaning no compression, to four Another form of implementation provides for a soft or a hard limitation of the input signals. In the case of a hard limitation the output signal, with the correct sign, is limited to the respective level of the threshold value not until that is about to be exceeded. The limit can be viewed as a compression factor of infinite magnitude. In the case of a soft limitation an increasingly larger compression factor is applied even before the threshold value is reached. The concomitant distortion causes any harmonics to weaken, the signal form to look "rounder" and the signal thus limited to have a more pleasant sound.
In the claims which follow and in the preceding description, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
N \MIboum\CesPagen\49000-49999\P49SR AtASpciS\P49058.AU Spcification 2007.10-18 dec 7/11/07

Claims (11)

1. A method for determining a threshold value in a hearing device, the threshold value serving to limit an output signal of a processing unit into which an input signal, has been fed, the method comprising the steps of: determining a mean value, I, of a level of the input signal in the hearing device; adjusting the threshold value as a function of the mean value; and limiting the output signal in the hearing device by applying the threshold value, wherein the threshold value is adjusted independently of the output signal, wherein the threshold value is adjusted to an upper value which is equal to the mean level of the input signal plus a preset difference, the output signal being limited by applying the upper value in case the output signal would be higher than the upper value.
2. A method for determining a threshold value in a hearing device, the threshold value serving to limit the output signal of a processing unit into which an input signal has been fed, the method comprising the steps of: determining a mean value, I, of a level of the input signal in the hearing device; adjusting the threshold value as a function of the main value; and limiting the output signal in the hearing device by applying the threshold value, wherein the threshold value is adjusted independently of the output signal, wherein the threshold value is always greater than or equal to a predetermined minimum threshold value.
3. A method for determining a threshold value in a hearing device, the threshold value serving to limit an L 12 output signal of a processing unit into which an input Ssignal, has been fed, the method comprising the Ssteps of: determining a mean value, I, of a level of the input signal in the hearing device; adjusting the threshold value as a function of the main value; and CI limiting the output signal in the hearing device by applying the threshold value, wherein the threshold 10 value is adjusted independently of the output signal, wherein the threshold value is adjusted to an upper value CI which is equal to the mean value plus a preset difference, the output signal being limited by applying the upper value in case the output signal would be higher than the upper value, and wherein the threshold value is always greater than or equal to a predetermined minimum threshold value.
4. The method of any one of claims 1 to 3, wherein the mean value is determined according to the following formula: T s(t)ldt 0 wherein T represents a time interval.
5. The method of claim i, wherein the upper value is always less than an upper comfort level.
6. The method of claim 3, wherein the upper value is always less than an upper comfort level.
7. The method of any one of claims 1 to 3, wherein the threshold value is adjusted along a compression ratio for a hearing-impaired person.
8. Use of the method of claim 5, for operating the hearing device for a hearing-impaired person.
13- O 9. Use of the method of claim 6, for operating the Shearing device for a hearing-impaired person. A system adapted to determine a threshold value in a hearing device, the threshold value serving to limit an output signal of a processing unit into which an input Ssignal, has been fed, the system comprising: C1 means for determining a mean value, I, of a level of the input signal in the hearing device; means for adjusting the threshold value as a function of the mean value, the threshold value being C( adjusted independently of the output signal; a processing unit which receives an input signal and is adapted to determine a threshold value for the purpose of limiting the output signal, said threshold value being adjustable as a function of the level of the input signal, and means for limiting the output signal in the hearing device by applying the threshold value, wherein the threshold value is adjusted to an upper value which is equal to the mean level of the input signal plus a preset difference, the output signal being limited by applying the upper value in case the output signal would be higher than the upper value. 11. A system adapted to determine a threshold value in a hearing device, the threshold value serving to limit an output signal of a processing unit into which an input signal, has been fed, the system comprising: means for determining a mean value, I, of a level of the input signal in the hearing device; means for adjusting the threshold value as a function of the mean value, the threshold value being adjusted independently of the output signal;
14- O a processing unit which receives an input signal Sand is adapted to determine a threshold value for the Spurpose of limiting the output signal, said threshold value being adjustable as a function of the level of the input signal, and means for limiting the output signal in the Shearing device by applying the threshold value, wherein CI the threshold value is always greater than or equal to a \O predetermined threshold value. 12. A system adapted to determine a threshold value in a c hearing device, the threshold value serving to limit an output signal of a processing unit into which an input signal, has been fed, the system comprising: means for determining a mean value, I, of a level of the input signal in the hearing device; means for adjusting the threshold value as a function of the mean value, the threshold value being adjusted independently of the output signal; a processing unit which receives an input signal and is adapted to determine a threshold value for the purpose of limiting the output signal, said threshold value being adjustable as a function of the level of the input signal, and means for limiting the output signal in the hearing device by applying the threshold value, wherein the threshold value is adjusted to an upper value which is equal to the mean value plus a preset difference, the output signal being limited by applying the upper value in case the output signal would be higher than the upper value, and wherein the threshold value is always greater than or equal to a predetermined minimum threshold value. 15 13. The system of any one of claims 10 to 12, wherein the mean value is obtained by the following formula: T I Swherein T represents a time interval. 14. The system of claim 10, wherein the upper value is always less than an upper comfort level. ^c 15. The system of claim 10, wherein the upper value is always less than an upper comfort level.
16. The system of any one of claims 10 to 12, wherein the threshold value is adjusted along a compression ratio for a hearing-impaired person.
AU2001276230A 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 Expired AU2001276230B9 (en)

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 (3)

Publication Number Publication Date
AU2001276230A1 AU2001276230A1 (en) 2002-01-03
AU2001276230B2 true AU2001276230B2 (en) 2008-01-10
AU2001276230B9 AU2001276230B9 (en) 2008-06-19

Family

ID=4358231

Family Applications (2)

Application Number Title Priority Date Filing Date
AU2001276230A Expired AU2001276230B9 (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
AU7623001A Pending AU7623001A (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

Family Applications After (1)

Application Number Title Priority Date Filing Date
AU7623001A Pending AU7623001A (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) AU2001276230B9 (en)
CA (1) CA2425180A1 (en)
DE (1) DE50115477D1 (en)
DK (1) DK1415393T3 (en)
WO (1) WO2001076063A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
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
DE602006000772T2 (en) * 2006-05-10 2009-04-16 Phonak Ag The hearing instrument
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182993A (en) * 1978-11-02 1980-01-08 Dbx Inc. Signal amplitude compression system
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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5119482B2 (en) * 1972-10-12 1976-06-17
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
JP3670962B2 (en) * 1997-12-23 2005-07-13 ヴェーデクス・アクティーセルスカプ Dynamic automatic gain control in hearing aids
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
EP1415393B1 (en) 2010-05-05
WO2001076063A2 (en) 2001-10-11
DE50115477D1 (en) 2010-06-17
WO2001076063A9 (en) 2002-07-18
WO2001076063A3 (en) 2002-09-26
AU7623001A (en) 2001-10-15
JP2004524714A (en) 2004-08-12
CA2425180A1 (en) 2003-04-07
AU2001276230B9 (en) 2008-06-19
EP1415393A2 (en) 2004-05-06
DK1415393T3 (en) 2010-08-30

Similar Documents

Publication Publication Date Title
US5091952A (en) Feedback suppression in digital signal processing hearing aids
CN111295707B (en) Personal acoustic device compressed hearing aid in (a)
US5553151A (en) Electroacoustic speech intelligibility enhancement method and apparatus
US8964997B2 (en) Adapted audio masking
US4887299A (en) Adaptive, programmable signal processing hearing aid
US7995781B2 (en) Method for operating a hearing device as well as a hearing device
US7372969B2 (en) Method for processing an input signal to generate an output signal, and application of said method in hearing aids and listening devices
US4475230A (en) Hearing aid
EP3654895B1 (en) An audio device with adaptive auto-gain
JP3868422B2 (en) Hearing aid and audio signal processing method
US20160381468A1 (en) Method for compressing the dynamics in an audio signal
AU2001276230B2 (en) Method for processing an input signal for producing an output signal and an application of said method in hearing aids and devices
EP3793218B1 (en) Hearing device and method for operating a hearing device
EP3568995B1 (en) Hearing device with acoustic shock control and method for acoustic shock control in a hearing device
US7123732B2 (en) Process to adapt the signal amplification in a hearing device as well as a hearing device
TW202247143A (en) Self-adaptive adjustment method
Nordqvist et al. Hearing-aid automatic gain control adapting to two sound sources in the environment, using three time constants

Legal Events

Date Code Title Description
FGA Letters patent sealed or granted (standard patent)
SREP Specification republished
MK14 Patent ceased section 143(a) (annual fees not paid) or expired