EP2180726B2 - Sound localization in binaural hearing aids - Google Patents

Sound localization in binaural hearing aids Download PDF

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Publication number
EP2180726B2
EP2180726B2 EP10000610.5A EP10000610A EP2180726B2 EP 2180726 B2 EP2180726 B2 EP 2180726B2 EP 10000610 A EP10000610 A EP 10000610A EP 2180726 B2 EP2180726 B2 EP 2180726B2
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EP
European Patent Office
Prior art keywords
signal
hearing aid
gain
hearing
ascertained
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EP10000610.5A
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German (de)
French (fr)
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EP2180726B1 (en
EP2180726A1 (en
Inventor
Frank Beck
Gerhard Sporer
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Sivantos GmbH
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Siemens Audioligische Technik GmbH
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/55Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/552Binaural

Definitions

  • the invention relates to a hearing aid system and a method for setting a hearing aid system having at least one first and one second hearing aid device, each having at least one input transducer for receiving an acoustic input signal and conversion to an electrical signal, a signal processing unit for processing the electrical signal and an output transducer for conversion comprise the electrical signal in an output signal and between which a signal path for data transmission is provided.
  • Directional hearing is the ability of a person to distinguish the direction in which a sound source is located. If a sound source is not in front of or behind the person, the finite propagation speed of the sound inevitably results in a difference in transit time between the two ears, and thus a time difference with which the ears perceive a sound wave coming from one direction. If a sound is e.g. from the perspective of the peson comes from the right, this reaches the right ear by a fraction of a second rather than the left ear. This time difference is much shorter than the person concerned can consciously recognize. The effect occurs through an automatic integration process in the acoustic nervous system.
  • the former solution has the disadvantage that a further assembly is necessary and the hearing aid wearer now requires three instead of two devices, which means a significant limitation of wearing comfort, maintenance and handling.
  • the second solution requires that all signal processing must be done by a single signal processing unit on a single page. While in the solution with a third device enough space is available to provide a correspondingly powerful signal processing and ensure their energy needs, the space is limited in a hearing aid located on the ear. Therefore, a master-slave solution with two differently designed hearing aids must necessarily have a lower computational capacity than would be available when using both hearing aids.
  • Another approach to solving the above problem is to transmit the incoming sound signals on the hearing aids of both sides to the other device and to process both signals on each side. In this way, the acoustic signals received at both ears undergo the same steps of signal processing together and therefore automatically experience the same signal delay.
  • This approach is for example from the WO 97/14268 as well as the WO 99/43185 out.
  • the transmission of the microphone signals on both sides of a binaural hearing aid system to the other side and the simultaneous processing of both signals on both sides solves the problem of a transit time difference, but is subject to the same limitations as the master-slave approach.
  • a method for operating a hearing aid system is known in which sound field characteristics are transmitted from one hearing aid to another. These can be signal levels.
  • a hearing aid is known in which a signal transmission from one to the other hearing aid via optical fibers is made. In this case, control signals can be transmitted.
  • the object of the present invention is to support the natural directional hearing in a hearing aid system for binaural care and to keep the additional computational effort required for this purpose low.
  • a hearing aid system In a hearing aid system, directional hearing in the case of binaural hearing aid supply is improved by matching the signal propagation times of the hearing aid devices attached to the two ears. However, the signal propagation times are only one factor affecting directional hearing.
  • an adaptation of the amplitude response of the two hearing aids is also carried out. Differences in the amplitudes of signals that occur from different directions are mainly caused by the shading effect of the head. The differences in the amplitudes are very small and can not be consciously perceived. Only by a very fine adjustment of the hearing aids of a hearing aid system, these minimum differences in amplitude, which are caused by different directions of incidence remain maintained. The exact amount of these differences is rather secondary.
  • a gain or gain change of an electrical signal in at least one of the hearing aid devices is determined.
  • the gain change may be e.g. be caused by the change of a parameter of the signal processing of the hearing aid.
  • data for identifying the current amplification or for characterizing the gain change is transmitted from the hearing aid device to the other hearing aid device of the hearing aid system. Also in this hearing aid then the gain is adjusted accordingly. This may mean that the gain is changed by the same amount.
  • the amplification in the second hearing aid device is changed such that the same loudness impression is produced again in the case of a sound signal arriving from the 0 degree direction (directly from the front) on both ears through the supply of the hearing aid devices. Deviating from the 0-degree direction sound signals are then perceived again with different loudness impression, so that the hearing aid wearer can perceive the direction from which the sound signal arrives.
  • the value of a gain change in a hearing aid according to the invention may be permanently assigned to certain settings or functions of the hearing aid. For example, in a feedback suppression algorithm, there may always be a 10 dB reduction in gain. Data for identifying this gain change can then, as soon as the algorithm is actively switched, be transferred to the other hearing aid device of the hearing aid system, so that a corresponding gain reduction is also performed in this case. In many applications, however, there is no fixed association between certain functions of the hearing aid and related gain changes. The amplification or gain change is then first determined automatically in the hearing aid. For this purpose, signal amplitudes or signal levels of an electrical signal to points in the signal path of the hearing aid behind one another recorded and evaluated.
  • a test signal is preferably fed into the signal path, which at least partially passes through the signal processing unit of the hearing aid.
  • the amplification in both hearing aids is determined and related data transferred to the other hearing aid in the gain adjustment.
  • filter media are preferably set.
  • an adjustment of the amplification of the two hearing aids of a hearing aid system is always carried out even when the gain setting when at least one of the hearing aids a parameter and / or functional change.
  • the gain adjustment can also be done at periodic intervals.
  • the determination and adaptation of the amplification or of the amplitude transmission behavior in a hearing device system with multi-channel hearing aid devices can in each case only relate to specific frequency bands.
  • the transmission behavior of signal amplitudes is also measured.
  • a test signal can be fed into the signal path at one point and read out again at the following point.
  • this measurement is also carried out for different signal frequencies. If a parameter or function change then takes place in at least one of the hearing aid devices, the transmission behavior with respect to the signal amplitudes can be measured again and differences in the transmission behavior can be ascertained. Data that are characteristic of the signal amplitudes are then transferred to the respective other hearing aid device of the hearing device system for adaptation to the changed transmission behavior.
  • the invention applies equally to behind the ear portable (BTE), in the ear portable (ITE) or implantable hearing aid systems application.
  • FIG. 1 shows a schematic representation of a hearing aid system with two hearing aids 1 and 1 '.
  • the processing of the electrical signal to compensate for the hearing loss of a hearing aid wearer takes place in the signal processing units 3 or 3 '.
  • the processed signal is finally converted back into a sound signal by an electric-acoustic output transducer (earphone) 4 or 4 'and fed to the ears of a hearing aid wearer.
  • earphone electric-acoustic output transducer
  • the adjustment of the hearing aid devices 1 and 1 'to the respective hearing situation takes place by actuation of a control element 7 or 7' on at least one of the hearing aid devices 1 or 1 '.
  • signal propagation times of the signal processing units 3 and 3' for the respective hearing programs and taking into account the respective settings of the hearing aid devices 1 and 1 'to compensate for the individual hearing loss of a hearing aid wearer are determined. This can be done, for example, by transit time measurements during the adaptation of the hearing aid devices 1 and 1 '. If the signal propagation times for both hearing aid devices 1 and 1 'are known under the selected settings for the respective hearing programs, the hearing programs are assigned data for characterizing the signal propagation times and are likewise stored in the memory units 6 or 6'. These data can be both the signal propagation times as such and also the respective transit time differences between the individual hearing programs or the hearing aid devices 1 and 1 '.
  • the hearing aid device 1 If, for example, the hearing aid device 1 is switched between two hearing programs, then not only the parameters of the new hearing program are read from the memory unit 6, but also the data assigned to the newly set hearing program for characterizing the signal delay time. The latter are then transmitted via a transmitting and receiving unit 8 to the hearing aid 1 '.
  • the hearing aid device 1 ' receives in turn by means of the transmitting and receiving unit 8' sent by the hearing aid 1 Data and supplies them to the control unit 5 '. This in turn compares the transmitted data with the information stored in the memory unit 6 'regarding the running time of the currently set hearing program. For example, by controlling a delay means, which is designed in the exemplary embodiment as an all-pass filter 9 or 9 ', then any differences in transit time can be compensated.
  • both hearing aid devices 1 and 1 'thus have the same signal propagation delay between the input transducer 2 and the output transducer 4 or the input transducer 2' and the output transducer 4 '.
  • both hearing aid devices 1 and 1 'thus have the same signal propagation delay between the input transducer 2 and the output transducer 4 or the input transducer 2' and the output transducer 4 '.
  • FIG. 2 Another hearing aid system shows FIG. 2 , Since in this case both hearing aids of the hearing aid system have the same equivalent circuit, is in FIG. 2 only one of the two, namely the hearing aid 11, shown. Also this includes as the hearing aids 1 and 1 'in the embodiment according to FIG. 1 a microphone 12 for receiving an acoustic signal and conversion into an electrical signal, a signal processing unit 13 for frequency-dependent processing of the electrical signal and a receiver 14 for converting the electrical signal into an acoustic output signal.
  • the hearing aid device 11 further comprises an A / D converter 15 for converting the output signal of the microphone into a digital signal, and a D / A converter 16 for reconverting the digital signal into an analog signal before the signal output via the receiver 14.
  • FIG. 2 a signal analysis of the digital electrical input signal in an analysis and control unit 17. Also, this is connected to a memory unit 18 in which different, the signal processing processing memory sets are stored.
  • a complete set of parameters which is stored in the memory unit 18, it is provided in the hearing aid 11, even adaptively change only individual settings and parameters for adjusting the signal processing to the respective hearing situation.
  • certain functions or algorithms can be switched on or off.
  • an algorithm for speech enhancement can be set in the hearing aid device, or an algorithm for noise suppression can be activated when detected noises.
  • the hearing aid device 11 has a transit time determination unit 19.
  • the fed-in signal passes through the signal processing unit 13 and is tapped before the output via the handset 14 and fed to the transit time determination unit 19.
  • the generated signal lies in a frequency range which is not audible acoustically by the hearing aid wearer.
  • the transit time measurement is advantageously carried out whenever a parameter or functional change has occurred in the hearing aid device 11.
  • the determined data relating to the signal transit time are finally transmitted via a transmitting and receiving unit 20 to the second hearing aid device (not shown) of the hearing aid system.
  • the hearing aid device 11 also receives the instantaneous signal transit time by means of the transmitting and receiving unit 20 through the signal processing unit of the second hearing aid device.
  • the analysis and control unit 17 is thus the information regarding the signal propagation times of both hearing aids of the hearing aid system.
  • a signal delay is subsequently performed by the difference of the signal propagation times determined in both hearing aid devices.
  • the hearing aid device 11 comprises a delay unit designed as a shift register 21.
  • the number of delay clocks by the analysis and control unit 17 is adjustable.
  • FIG. 3 Another hearing aid is in FIG. 3 shown.
  • a hearing aid 22 shows a hearing aid according to FIG. 2 very similar construction.
  • the hearing aid 22 has a clock generator 23 with adjustable clock frequency.
  • the system clock of the hearing aid 22 is adjustable.
  • the clock frequency is increased so far to compensate for the delay difference until the delay difference is compensated. Accordingly, the clock frequency of the hearing aid device 22 is reduced so far that the signal propagation times are equalized at a shorter signal propagation time determined for the hearing aid device 22.
  • Gain values are determined and related data stored in the memory units 6 and 6 '. In a gain change in one of the two hearing aids as a result of a parameter and / or functional change (eg changing the hearing program) then the gain in the other hearing aid is adjusted accordingly.
  • an amplitude compensation can be done.
  • a test signal is advantageously fed via the measuring device 19 into the signal path and picked up again at a later point in the signal path, preferably after the signal processing unit 13.
  • the signal transmission behavior with regard to the signal amplitudes is also measured so advantageously.
  • the measurement is carried out at different frequencies.
  • a different gain value can be determined for different frequencies.
  • Data relating to the amplification values thus determined are then transmitted to the respective other hearing aid device of the hearing aid system. Subsequently, an adjustment of the signal amplitudes takes place, with at least one of the hearing aid devices changing the gain or setting filter means.
  • the adjustment of the signal amplitudes follows, taking into account the audiograms measured in both ears. Data regarding these audiograms may also be stored in the storage units 18.
  • the loudness compensation then takes place in relation to the audiograms, which ensures that, for example, a slight loudness change caused by a parameter change on a hearing aid device causes a loudness change subjectively the same for the hearing aid wearer on the other hearing aid.
  • a slight loudness change caused by a parameter change on a hearing aid device causes a loudness change subjectively the same for the hearing aid wearer on the other hearing aid.
  • slight loudness differences in the two ears of a hearing aid wearer are always perceived the same regardless of the current hearing aid settings.
  • FIG. 4 shows only a hearing aid 24 of a hearing aid system with two identically constructed hearing aids.
  • the hearing aid device 24 comprises two microphones 25 and 26 whose output signals are fed to a signal preprocessing unit 27.
  • the signal pre-processing unit 27 an A / D conversion and an electrical connection of the microphone signals to produce a directional microphone characteristic.
  • a filter bank 28 serves to split the electrical signal into frequency bands.
  • signal processing units 29A, 29B, 29C and 29D a frequency band-specific signal processing of the electrical signals in the individual frequency bands then takes place.
  • the output signals of the signal processing units 29A to 29D are added and post-processed in a signal post-processing unit 30.
  • the signal post-processing may include, for example, an end gain and D / A conversion.
  • the analog electrical output signal is converted back into an acoustic output signal by a receiver 31.
  • the individual signal processing blocks of the hearing aid device that is to say the signal preprocessing unit 27, the filter bank 28, the signal processing units 29A to 29D in the individual channels, and the signal postprocessing unit 30, are collectively referred to as signal processing unit 29 in the exemplary embodiment.
  • the hearing aid device 24 has a signal analysis and control unit 33, into which the electrical input signal before dividing into different frequency bands and the electrical output signal after passing through the signal processing units 29A to 29D.
  • the signal analysis and control unit 33 for example, feedback-related oscillations in the electrical input signal can be detected.
  • the gain may be reduced.
  • Data relating to this gain change in the relevant channel are then acquired by the signal analysis and control unit 33 and transmitted by means of a transmitting and receiving unit 34 to the second hearing aid (not shown). This receives the transmitted data and in turn lowers the gain in the corresponding channel by means of a signal analysis and control unit of the hearing aid 24 corresponding signal analysis and control unit.
  • data relating to a change in gain in the second hearing aid device of the hearing aid system can also be transmitted to the hearing aid device 24, which acts by means of the signal analysis and control unit 33 on components (for example the signal processing units 29A to 29D in the individual channels) and the gain in the hearing aid device 24 adapts accordingly.
  • the gain change can be made in both hearing aids by the same amount. Preferably, however, it takes place taking into account the individual hearing loss of the hearing device wearer and the signal transmission characteristics of the hearing aid devices. The hearing aid wearer then subjectively perceives the same gain reduction on both hearing aids. Natural loudness differences in the acoustic input signals remain largely preserved for the hearing aid wearer.
  • parameter or functional changes in hearing aids result as a result of the current hearing situation not to predetermined gain changes. This is the case, for example, with hearing aid devices in which complete sets of parameters for adaptation to different listening situations are not predetermined, but in which an adaptive and continuous adaptation of individual parameters takes place.
  • a gain change is then advantageously determined by a hearing aid internal measurement.
  • the gain change can be determined from measurements of the gain before and after a parameter change.
  • the electrical input signal and the electrical output signal in the signal analysis and control unit 33 are evaluated.
  • Both an evaluation of the total input or output signal and the electrical input and output signals of the signal processing units 29A to 29D of the individual channels is possible, depending on whether a change in the parameter affects the entire frequency range or only signal frequencies within a frequency band.
  • Analogous to the adjustment of the amplification can in a hearing aid system with two hearing aids with a schematic block diagram according to the exemplary hearing aid device 24, as in FIG. 4 represented, the signal amplitudes or the signal propagation times of the two hearing aids are adapted to each other, so that the natural directional hearing is maintained even with worn hearing aids.
  • only other signal analysis methods in the signal analysis and control unit 33 are provided for the amplitude or delay compensation over the gain compensation.
  • the amplitude compensation is preceded by amplitude or level measurements or the delay compensation phase or signal propagation time measurements on the overall signal or in the individual channels of the hearing aid device 24.
  • the compensation is then preferably carried out by adjustable filter means within the signal processing unit 29, which are set by the signal analysis and control unit 33.
  • a correlation analysis is performed for the transit time measurement.
  • the signal analysis and control unit 33 electrical signals from successive points in the signal path between the microphones 25 and 26 and the handset 31 are supplied.
  • the phase shift and thus the signal propagation time can then be determined in a simple manner.
  • the envelopes of the supplied signals are first determined in the signal analysis and control unit.
  • the comparison of the envelopes in the signal analysis and evaluation unit 33 also makes it easy to deduce the phase shift of the relevant signals and thus the signal propagation time between the points of interest in the signal path of the hearing aid device 24.
  • the measurements are carried out in each case shortly before and shortly after parameter or functional changes in the hearing aid device 24 in order to detect the resulting amplification and / or amplitude and / or signal propagation time changes in the hearing aid device 24, related data to the second hearing aid device of the hearing aid system transmit, receive there, evaluate and finally compensate for the changes.
  • the invention proposes in each case to measure signal amplitudes and / or amplifications of an electrical signal in a signal path between an input transducer and an output transducer of a hearing aid device and to transmit data relating to the measured signal amplitudes and / or amplifications to the respective other hearing aid device.
  • the signal amplitudes of the electrical signals can be matched to each other by the two hearing aids.
  • no amplitude distortion is caused by the hearing aids and the natural amplitude difference of an incident from a particular direction sound signal is maintained.
  • the direction information for the hearing aid wearer is retained.

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  • Health & Medical Sciences (AREA)
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  • Otolaryngology (AREA)
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Description

Die Erfindung betrifft ein Hörgerätesystem sowie ein Verfahren zum Einstellen eines Hörgerätesystems mit wenigstens einem ersten und einem zweiten Hörhilfegerät, die jeweils wenigstens einen Eingangswandler zur Aufnahme eines akustischen Eingangssignals und Wandlung in ein elektrisches Signal, eine Signalverarbeitungseinheit zur Verarbeitung des elektrischen Signals und einen Ausgangswandler zur Wandlung des elektrischen Signals in ein Ausgangssignal umfassen und zwischen denen ein Signalpfad zur Datenübertragung vorgesehen ist.The invention relates to a hearing aid system and a method for setting a hearing aid system having at least one first and one second hearing aid device, each having at least one input transducer for receiving an acoustic input signal and conversion to an electrical signal, a signal processing unit for processing the electrical signal and an output transducer for conversion comprise the electrical signal in an output signal and between which a signal path for data transmission is provided.

Unter dem Richtungshören versteht man die Fähigkeit einer Person zur Unterscheidung der Richtung, in welcher sich eine Schallquelle befindet. Wenn sich eine Schallquelle nicht frontal vor oder hinter der Person befindet, ergibt sich durch die endliche Ausbreitungsgeschwindigkeit des Schalls zwangsläufig ein Laufzeitunterschied zwischen den beiden Ohren und damit eine zeitliche Differenz, mit der die Ohren eine aus einer Richtung kommende Schallwelle wahrnehmen. Wenn ein Schall z.B. aus der Sicht der Peson von rechts kommt, erreicht dieser das rechte Ohr um einen Bruchteil einer Sekunde eher als das linke Ohr. Diese Zeitdifferenz ist weitaus kürzer als der Betreffende bewusst erkennen kann. Die Wirkung tritt durch einen automatischen Integrationsprozess im akustischen Nervensystem ein.Directional hearing is the ability of a person to distinguish the direction in which a sound source is located. If a sound source is not in front of or behind the person, the finite propagation speed of the sound inevitably results in a difference in transit time between the two ears, and thus a time difference with which the ears perceive a sound wave coming from one direction. If a sound is e.g. from the perspective of the peson comes from the right, this reaches the right ear by a fraction of a second rather than the left ear. This time difference is much shorter than the person concerned can consciously recognize. The effect occurs through an automatic integration process in the acoustic nervous system.

Neben der zeitlichen Differenz ergibt sich weiterhin auch ein Unterschied in der Lautstärke, mit der die Ohren einen Ton wahrnehmen, der von einer Seite kommt. Eine Schallquelle auf einer Seite des Kopfes übermittelt dem Ohr auf dieser Seite einen etwas lauteren Ton. Auch dieser minimale Unterschied in der Lautstärke reicht aus, damit die Schallquelle aus der Sicht der Person links oder rechts lokalisiert werden kann.In addition to the time difference, there is still a difference in the volume with which the ears perceive a sound coming from one side. A sound source on one side of the head gives the ear a slightly louder sound on that side. Also, this minimal difference in volume is sufficient so that the sound source from the perspective of the person can be located on the left or right.

Bei binauraler Hörgeräte-Versorgung tritt häufig ein Verlust des Richtungshörens auf. Dies ist vor allem dadurch begründet, dass je nach Hörsituation, die von dem jeweiligen Hörhilfegerät detektiert wird, die Signalverarbeitung der beiden Hörhilfegeräte unterschiedliche Schritte umfassen kann. Weiterhin ist bei einem Hörgeräteträger in der Regel der Hörverlust beider Ohren unterschiedlich stark ausgeprägt. Entsprechend sind auch die Einstellungen der Hörgeräte zum Ausgleich des Hörverlustes des jeweiligen Ohres unterschiedlich eingestellt. Unterschiedliche Einstellungen der Signalverarbeitung beider Hörgeräte haben jedoch zumeist unterschiedliche Signallaufzeiten innerhalb der Hörhilfegeräte zur Folge. Es kommt daher zu einer unnatürlichen Verschiebung der für das Richtungshören wichtigen Phase eines akustischen Eingangssignals. Wie eingangs bereits erwähnt, ist die Laufzeit eines Schallsignals zwischen den beiden Ohren neben dem Unterschied in der Lautstärke für das Richtungshören von großer Bedeutung. Bereits geringfügige Veränderungen dieser natürlichen Laufzeitverschiebung, wie sie beispielsweise von unterschiedlichen Signallaufzeiten innerhalb der Hörhilfegeräte verursacht werden, können daher zu einem Verlust des Richtungshörens führen.In binaural hearing aid care, loss of directional hearing often occurs. This is mainly due to the fact that depending on the hearing situation, which is detected by the respective hearing aid, the signal processing of the two hearing aids may include different steps. Furthermore, in a hearing aid wearer usually the hearing loss of both ears is pronounced to different degrees. Accordingly, the settings of the hearing aids to compensate for the hearing loss of each ear are set differently. However, different settings of the signal processing of both hearing aids usually result in different signal propagation times within the hearing aid devices. There is therefore an unnatural shift in the important for directional listening phase of an acoustic input signal. As already mentioned, the transit time of a sound signal between the two ears in addition to the difference in the volume for the directional hearing of great importance. Even slight changes in this natural transit time shift, as caused for example by different signal propagation times within the hearing aid devices, can therefore lead to a loss of directional hearing.

Zur Lösung dieses Problems ist bekannt, die an den beiden Ohren aufgenommenen akustischen Signale in einer gemeinsamen zentralen Signalverarbeitungseinrichtung zu verarbeiten. So sieht die US 5,479,522 neben zwei jeweils an einem Ohr getragenen Hörgeräten eine zusätzliche Prozessoreinheit vor, die beispielsweise als Brustgerät oder Armbanduhr ausgeführt sein kann. Die an den beiden Ohren aufgenommenen akustischen Signale durchlaufen die gleichen Signalverarbeitungsschritte, so dass die Phasenbeziehung zwischen den beiden Signalen erhalten bleibt.To solve this problem, it is known to process the recorded on the two ears acoustic signals in a common central signal processing device. That's how it looks US 5,479,522 in addition to two hearing aids worn in each case on one ear, an additional processor unit which can be designed, for example, as a breast appliance or wristwatch. The acoustic signals received at the two ears undergo the same signal processing steps, so that the phase relationship between the two signals is maintained.

Aus der US 5,434,924 ist bekannt, die Signalverarbeitung bei binauraler Versorgung im Wesentlichen nur in einem der beiden Hörhilfegeräte auszuführen. Hierzu werden die an einem Ohr empfangenen Signale auf das Hörgerät des anderen Ohrs übertragen, dort gemeinsam verarbeitet und dann beiden Ohren zugeführt (Master-Slave-Lösung).From the US 5,434,924 It is known to perform the signal processing in binaural supply substantially only in one of the two hearing aids. For this purpose, the signals received at one ear are transmitted to the hearing aid of the other ear, processed there together and then fed to both ears (master-slave solution).

Die erstgenannte Lösung hat den Nachteil, dass eine weitere Baugruppe notwendig wird und der Hörgeräteträger nun drei statt zwei Geräte benötigt, was eine erhebliche Einschränkung des Tragekomforts, der Wartung und der Handhabung bedeutet. Die zweite Lösung bedingt, dass die gesamte Signalverarbeitung von einer einzigen Signalverarbeitungseinheit auf nur einer Seite geleistet werden muss. Während bei der Lösung mit einem dritten Gerät genügend Platz vorhanden ist, um eine entsprechend leistungsfähige Signalverarbeitung vorzusehen und deren Energiebedarf sicherzustellen, ist der Platz in einer am Ohr befindlichen Hörhilfe begrenzt. Daher muss eine Master-Slave-Lösung mit zwei unterschiedlich ausgebildeten Hörhilfegeräten notgedrungen eine geringere rechnerische Kapazität besitzen als bei der Ausnutzung beider Hörhilfegeräte zur Verfügung stünde.The former solution has the disadvantage that a further assembly is necessary and the hearing aid wearer now requires three instead of two devices, which means a significant limitation of wearing comfort, maintenance and handling. The second solution requires that all signal processing must be done by a single signal processing unit on a single page. While in the solution with a third device enough space is available to provide a correspondingly powerful signal processing and ensure their energy needs, the space is limited in a hearing aid located on the ear. Therefore, a master-slave solution with two differently designed hearing aids must necessarily have a lower computational capacity than would be available when using both hearing aids.

Ein weiterer Ansatz zur Lösung des genannten Problems besteht darin, die eingehenden Schallsignale an den Hörhilfegeräten beider Seiten zu dem jeweils anderen Gerät zu übertragen und auf jeder Seite beide Signale zu verarbeiten. Auf diese Weise durchlaufen die an beiden Ohren aufgenommenen akustischen Signale gemeinsam die gleichen Schritte der Signalverarbeitung und erfahren daher automatisch die gleiche Signalverzögerung. Dieser Lösungsansatz geht beispielsweise aus der WO 97/14268 sowie der WO 99/43185 hervor. Die Übertragung der Mikrofonsignale beider Seiten eines binauralen Hörgerätesystems an die jeweils andere Seite und die gleichzeitige Verarbeitung beider Signale auf beiden Seiten löst zwar das Problem einer Laufzeitdifferenz, unterliegt aber den gleichen Beschränkungen wie der Master-Slave-Ansatz.Another approach to solving the above problem is to transmit the incoming sound signals on the hearing aids of both sides to the other device and to process both signals on each side. In this way, the acoustic signals received at both ears undergo the same steps of signal processing together and therefore automatically experience the same signal delay. This approach is for example from the WO 97/14268 as well as the WO 99/43185 out. Although the transmission of the microphone signals on both sides of a binaural hearing aid system to the other side and the simultaneous processing of both signals on both sides solves the problem of a transit time difference, but is subject to the same limitations as the master-slave approach.

Ein weiterer wesentlicher Nachteil aller genannter Lösungen liegt in der Tatsache, dass sie alle die Übermittlung großer Datenmengen erfordern. Dies bedingt einen erheblichen Zeit-, Platz- und Energieverbrauch. Insbesondere bei dṙahtlosem Datentransfer, wie er beim gegenwärtigen Stand der Technik geboten ist, stellt dies einen erheblichen Nachteil dar.Another major disadvantage of all mentioned solutions lies in the fact that they all require the transmission of large amounts of data. This requires a considerable amount of time, space and energy consumption. Especially in the case of seamless data transfer, such as he is offered in the current state of the art, this represents a significant disadvantage.

Aus der EP 0 941 014 A2 ist ein Hörgerätesystem mit einem ersten und einem zweiten Hörgerät bekannt, bei dem durch Betätigung eines Bedienelementes an dem ersten Hörgerät Steuersignale erzeugt und auf das zweite Hörgerät übertragen werden. Dadurch wird durch die Betätigung des Bedienelementes an einem der Hörgeräte die gleichzeitige Einstellung beider Hörgeräte bewirkt.From the EP 0 941 014 A2 a hearing aid system with a first and a second hearing device is known in which by actuation of a control element on the first hearing aid control signals are generated and transmitted to the second hearing aid. As a result, the simultaneous adjustment of both hearing aids is effected by the operation of the control element on one of the hearing aids.

Aus der DE 100 48 354 A1 ist ein Verfahren zum Betrieb eines Hörgerätesystems bekannt, bei dem Schallfeldkennwerte von einem zum anderen Hörgerät übertragen werden. Dabei kann es sich um Signalpegel handeln.From the DE 100 48 354 A1 For example, a method for operating a hearing aid system is known in which sound field characteristics are transmitted from one hearing aid to another. These can be signal levels.

Aus der DE 197 04 119 C1 ist eine Hörhilfe bekannt, bei der eine Signalübertragung von einem zum anderen Hörgerät über Lichtleiter vorgenommen wird. Dabei können Steuersignale übertragen werden.From the DE 197 04 119 C1 a hearing aid is known in which a signal transmission from one to the other hearing aid via optical fibers is made. In this case, control signals can be transmitted.

Aufgabe der vorliegenden Erfindung ist es, bei einem Hörgerätesystem zur binauralen Versorgung das natürliche Richtungshören zu unterstützen und den hierfür erforderlichen zusätzlichen Rechenaufwand gering zu halten.The object of the present invention is to support the natural directional hearing in a hearing aid system for binaural care and to keep the additional computational effort required for this purpose low.

Diese Aufgabe wird gelöst durch Verfahren mit den Verfahrensschritten gemäß den Ansprüchen 1 oder 10.This object is achieved by methods with the method steps according to claims 1 or 10.

Ferner wird die Aufgabe durch ein Hörgerätesystem mit den Merkmalen gemäß den Ansprüchen 17 oder 19 gelöst.Furthermore, the object is achieved by a hearing aid system having the features according to claims 17 or 19.

Bei einem aus dem eingangs zitierten Stand der Technik bekannten Hörgerätesystem mit zwei Hörgeräten wird eine gleiche Signallaufzeit in den Signalpfaden beider Hörgeräte zwischen jeweils dem Mikrofon und dem Hörer erzeugt, ohne diese Signallaufzeit explizit zu kennen. Nachteilig sind der hohe Rechenaufwand und die hohen erforderlichen Datenübertragungsraten.In a known from the cited prior art hearing aid system with two hearing aids a same signal propagation time in the signal paths of both hearing aids between each of the microphone and the listener is generated, without knowing this signal propagation time explicitly. Disadvantages are the high computational effort and the high data transfer rates required.

Bei einem Hörgerätesystem wird das Richtungshören bei binauraler Hörgeräteversorgung dadurch verbessert, dass die Signallaufzeiten der an den beiden Ohren angebrachten Hörhilfegeräte angeglichen werden. Die Signallaufzeiten sind jedoch nur ein Faktor, der das Richtungshören betrifft. Bei einem Hörgerätesystem gemäß der Erfindung erfolgt auch eine Anpassung des Amplitudenganges der beiden Hörhilfegeräte. Unterschiede in den Amplituden von Signalen, die aus unterschiedlichen Richtungen einfallen, werden vor allem durch die Abschattungswirkung des Kopfes hervorgerufen. Dabei sind die Unterschiede in den Amplituden sehr gering und können nicht bewusst wahrgenommen werden. Nur durch eine sehr feine Anpassung der Hörhilfegeräte eines Hörgerätesystems können diese minimalen Amplitudenunterschiede, die durch unterschiedliche Einfallsrichtungen hervorgerufen werden, aufrechterhalten bleiben. Dabei ist die exakte Höhe dieser Unterschiede eher zweitrangig. Wichtig ist vor allem, dass eine Amplitudendifferenz bei einem Signal aus einer bestimmten Richtung weitgehend erhalten bleibt, auch wenn sich bei einem oder bei beiden Hörhilfegeräten Einstellungen ändern. Wird z.B. bei einem Hörhilfegerät die Lautstärke erhöht, so sollte auch bei dem anderen Hörhilfegerät eine Anpassung der Lautstärke erfolgen. Da jedoch häufig nicht beide Ohren eines Hörgeräteträgers gleichermaßen von einem Hörverlust betroffen sind, kann die Lautstärkenanpassung in der Regel nicht bei beiden Hörhilfegeräten gleichermaßen erfolgen. Vielmehr hat die Anpassung unter Berücksichtigung der individuellen Hörkurven, die an den beiden Ohren eines Hörgeräteträgers gemessen wurden, zu erfolgen. Entscheidend ist also, dass einem Hörgeräteträger bei einem Signal, das aus einer bestimmten Richtung kommt, an dem Ohr mit der kürzeren Entfernung zu der Signalquelle stets eine etwas höhere Lautstärke vermittelt wird.In a hearing aid system, directional hearing in the case of binaural hearing aid supply is improved by matching the signal propagation times of the hearing aid devices attached to the two ears. However, the signal propagation times are only one factor affecting directional hearing. In a hearing aid system according to the invention, an adaptation of the amplitude response of the two hearing aids is also carried out. Differences in the amplitudes of signals that occur from different directions are mainly caused by the shading effect of the head. The differences in the amplitudes are very small and can not be consciously perceived. Only by a very fine adjustment of the hearing aids of a hearing aid system, these minimum differences in amplitude, which are caused by different directions of incidence remain maintained. The exact amount of these differences is rather secondary. It is important above all that an amplitude difference in a signal from a certain direction is largely retained, even if change in one or both hearing aids settings. If e.g. If the volume increases in a hearing aid, then the volume should also be adjusted in the case of the other hearing aid. However, since often both ears of a hearing aid wearer are equally affected by hearing loss, the volume adjustment usually can not be done equally in both hearing aids. Rather, the adjustment has to be done taking into account the individual hearing curves that were measured on the two ears of a hearing aid wearer. So it is crucial that a hearing aid wearer is always given a slightly higher volume at the ear with the shorter distance to the signal source at a signal that comes from a certain direction.

Bei einer Ausführungsform der Erfindung wird bei einem Hörgerätesystem mit zwei am Kopf tragbaren Hörhilfegeräten eine Verstärkung bzw. Verstärkungsänderung eines elektrischen Signals in wenigstens einem der Hörhilfegeräte ermittelt. Die Verstärkungsänderung kann z.B. durch die Änderung eines Parameters der Signalverarbeitung des Hörhilfegerätes hervorgerufen worden sein. Dann werden Daten zur Kennzeichnung der aktuellen Verstärkung bzw. zur Kennzeichnung der Verstärkungsänderung von dem Hörhilfegerät auf das andere Hörhilfegerät des Hörgerätesystems übertragen. Auch in diesem Hörhilfegerät wird dann die Verstärkung entsprechend angepasst. Dies kann bedeuten, dass die Verstärkung um den gleichen Betrag geändert wird. Vorzugsweise wird die Verstärkung bei dem zweiten Hörhilfegerät jedoch so geändert, dass bei einem aus der 0-Gradrichtung (direkt von vorne) eintreffenden Schallsignal an beiden Ohren durch die Versorgung mit den Hörhilfegeräten wieder der gleiche Lautheitseindruck entsteht. Von der 0-Gradrichtung abweichende Schallsignale werden dann wieder mit unterschiedlichem Lautheitseindruck wahrgenommen, so dass der Hörgeräteträger die Richtung, aus dem das Schallsignal eintrifft, wahrnehmen kann.In one embodiment of the invention, in a hearing aid system having two hearing aid devices that can be worn on the head, a gain or gain change of an electrical signal in at least one of the hearing aid devices is determined. The gain change may be e.g. be caused by the change of a parameter of the signal processing of the hearing aid. Then, data for identifying the current amplification or for characterizing the gain change is transmitted from the hearing aid device to the other hearing aid device of the hearing aid system. Also in this hearing aid then the gain is adjusted accordingly. This may mean that the gain is changed by the same amount. Preferably, however, the amplification in the second hearing aid device is changed such that the same loudness impression is produced again in the case of a sound signal arriving from the 0 degree direction (directly from the front) on both ears through the supply of the hearing aid devices. Deviating from the 0-degree direction sound signals are then perceived again with different loudness impression, so that the hearing aid wearer can perceive the direction from which the sound signal arrives.

Der Wert einer Verstärkungsänderung bei einem Hörhilfegerät gemäß der Erfindung kann bestimmten Einstellungen oder Funktionen des Hörhilfegerätes fest zugeordnet sein. So kann beispielsweise bei einem Algorithmus zur Rückkopplungsunterdrückung stets eine Verringerung der Verstärkung um 10 dB vorgesehen sein. Daten zur Kennzeichnung dieser Verstärkungsänderung können dann, sobald der Algorithmus aktiv geschaltet wird, auf das andere Hörhilfegerät des Hörgerätesystems übertragen werden, damit auch bei diesem eine entsprechende Verstärkungsabsenkung durchgeführt wird. In vielen Anwendungsfällen steht jedoch keine feste Zuordnung zwischen bestimmten Funktionen des Hörhilfegerätes und damit verbundenen Verstärkungsänderungen. Die Verstärkung bzw. Verstärkungsänderung wird dann zunächst automatisch im Hörhilfegerät ermittelt. Hierzu können Signalamplituden oder Signalpegel eines elektrischen Signals an im Signalpfad des Hörhilfegerätes hintereinander liegenden Punkten erfasst und ausgewertet werden. Auch hierfür wird vorzugsweise ein Testsignal in den Signalpfad eingespeist, das die Signalverarbeitungseinheit des Hörhilfegerätes zumindest teilweise durchläuft. Vorzugweise wird auch bei der Verstärkungsanpassung die Verstärkung in beiden Hörhilfegeräten ermittelt und diesbezügliche Daten auf das jeweils andere Hörhilfegerät übertragen. Zur Anpassung der Verstärkung in einem Hörhilfegerät an eine Verstärkungsänderung bei einem zweiten Hörhilfegerät eines Hörgerätesystems werden vorzugsweise Filtermittel eingestellt. Vorzugsweise wird auch bei der Verstärkungseinstellung immer dann, wenn sich bei wenigstens einem der Hörhilfegeräte eine Parameter- und/oder Funktionsänderung ergibt, eine Anpassung der Verstärkung der beiden Hörhilfegeräte eines Hörgerätesystems durchgeführt. Auch die Verstärkungsanpassung kann jedoch in periodischen Zeitabständen erfolgen. Ebenso wie die Ermittlung und Anpassung der Signallaufzeit kann auch die Ermittlung und Anpassung der Verstärkung bzw. des Amplitudenübertragungsverhaltens bei einem Hörgerätesystem mit Mehrkanal-Hörhilfegeräten jeweils nur auf bestimmte Frequenzbänder bezogen sein.The value of a gain change in a hearing aid according to the invention may be permanently assigned to certain settings or functions of the hearing aid. For example, in a feedback suppression algorithm, there may always be a 10 dB reduction in gain. Data for identifying this gain change can then, as soon as the algorithm is actively switched, be transferred to the other hearing aid device of the hearing aid system, so that a corresponding gain reduction is also performed in this case. In many applications, however, there is no fixed association between certain functions of the hearing aid and related gain changes. The amplification or gain change is then first determined automatically in the hearing aid. For this purpose, signal amplitudes or signal levels of an electrical signal to points in the signal path of the hearing aid behind one another recorded and evaluated. For this, too, a test signal is preferably fed into the signal path, which at least partially passes through the signal processing unit of the hearing aid. Preferably, the amplification in both hearing aids is determined and related data transferred to the other hearing aid in the gain adjustment. To adapt the gain in a hearing aid to a gain change in a second hearing aid of a hearing aid system filter media are preferably set. Preferably, an adjustment of the amplification of the two hearing aids of a hearing aid system is always carried out even when the gain setting when at least one of the hearing aids a parameter and / or functional change. However, the gain adjustment can also be done at periodic intervals. As well as the determination and adaptation of the signal propagation time, the determination and adaptation of the amplification or of the amplitude transmission behavior in a hearing device system with multi-channel hearing aid devices can in each case only relate to specific frequency bands.

Bei einer vorteilhaften Ausführungsform der Erfindung wird neben der Ermittlung von Signallaufzeiten bei den Hörhilfegeräten eines Hörgerätesystems auch das Übertragungsverhalten von Signalamplituden gemessen. Auch hierbei kann ein Testsignal an einer Stelle in den Signalpfad eingespeist und an nachfolgender Stelle wieder ausgelesen werden. Vorzugsweise erfolgt auch diese Messung für unterschiedliche Signalfrequenzen. Erfolgt anschließend eine Parameter- oder Funktionsänderung bei wenigstens einem der Hörhilfegeräte, so können das Übertragungsverhalten bezüglich der Signalamplituden erneut gemessen und Unterschiede im Übertragungsverhalten festgestellt werden. Für die Signalamplituden charakteristische Daten werden dann auf das jeweils andere Hörhilfegerät des Hörgerätesystems übertragen zur Anpassung an das geänderte Übertragungsverhalten.In an advantageous embodiment of the invention, in addition to the determination of signal propagation times in the hearing aid devices of a hearing aid system, the transmission behavior of signal amplitudes is also measured. Here, too, a test signal can be fed into the signal path at one point and read out again at the following point. Preferably, this measurement is also carried out for different signal frequencies. If a parameter or function change then takes place in at least one of the hearing aid devices, the transmission behavior with respect to the signal amplitudes can be measured again and differences in the transmission behavior can be ascertained. Data that are characteristic of the signal amplitudes are then transferred to the respective other hearing aid device of the hearing device system for adaptation to the changed transmission behavior.

Die Erfindung findet gleichermaßen bei hinter dem Ohr tragbaren (HdO), in dem Ohr tragbaren (IdO) oder implantierbaren Hörgerätesystemen Anwendung.The invention applies equally to behind the ear portable (BTE), in the ear portable (ITE) or implantable hearing aid systems application.

Weitere Einzelheiten der Erfindung werden nachfolgend anhand von Ausführungsbeispielen näher erläutert. Es zeigen:

  • Figur 1 ein Hörgerätesystem mit zwei Hörhilfegeräten, zwischen denen ein Signalpfad vorgesehen ist und bei denen unterschiedliche Hörprogramme einstellbar sind,
  • Figur 2 ein Hörhilfegerät mit einer Signallaufzeit-Messeinrichtung und einem einstellbaren Verzögerungselement,
  • Figur 3 ein Hörhilfegerät mit einem Signallaufzeit- und Amplituden- Messelement und einstellbarer Taktfrequenz und
  • Figur 4 ein Hörhilfegerät, bei dem die Signalverarbeitung parallel in mehreren Frequenzkanälen erfolgt, mit einer Signalanalyse- und Steuereinheit.
Further details of the invention will be explained in more detail with reference to embodiments. Show it:
  • FIG. 1 a hearing aid system with two hearing aids, between which a signal path is provided and in which different hearing programs can be set,
  • FIG. 2 a hearing aid device with a signal transit time measuring device and an adjustable delay element,
  • FIG. 3 a hearing aid with a signal delay and amplitude measuring element and adjustable clock frequency and
  • FIG. 4 a hearing aid, in which the signal processing takes place in parallel in several frequency channels, with a signal analysis and control unit.

Figur 1 zeigt in schematischer Darstellung ein Hörgerätesystem mit zwei Hörhilfegeräten 1 und 1'. Die Hörhilfegeräte 1 und 1' umfassen jeweils einen akustisch-elektrischen Eingangswandler (Mikrofon) 2 bzw. 2' zur Aufnahme eines akustischen Eingangssignals und Wandlung in ein elektrisches Signal. Die Verarbeitung des elektrischen Signals zum Ausgleich des Hörverlustes eines Hörgeräteträgers findet in den Signalverarbeitungseinheiten 3 bzw. 3' statt. Das verarbeitete Signal wird schließlich durch einen elektrisch-akustischen Ausgangswandler (Hörer) 4 bzw. 4' in ein Schallsignal zurückverwandelt und den Ohren eines Hörgeräteträgers zugeführt. FIG. 1 shows a schematic representation of a hearing aid system with two hearing aids 1 and 1 '. The hearing aids 1 and 1 'each comprise an acousto-electrical input transducer (microphone) 2 or 2' for receiving an acoustic input signal and conversion into an electrical signal. The processing of the electrical signal to compensate for the hearing loss of a hearing aid wearer takes place in the signal processing units 3 or 3 '. The processed signal is finally converted back into a sound signal by an electric-acoustic output transducer (earphone) 4 or 4 'and fed to the ears of a hearing aid wearer.

Zur Anpassung an unterschiedliche Hörsituationen, wie beispielsweise "Sprache in ruhiger Umgebung", "Sprache mit Störgeräusch", "Fahrt im Auto" usw., umfassen die Hörhilfegeräte 1 und 1' je eine Steuereinheit 5 bzw. 5'. Die Steuereinheiten 5 und 5' sind mit Speichereinheiten 6 bzw. 6' verbunden, in denen unterschiedliche Parametersätze zur Anpassung der Signalverarbeitungseinheiten 3 bzw. 3' an unterschiedliche Hörsituationen gespeichert sind.To adapt to different listening situations, such as "speech in a quiet environment", "speech with noise", "driving in the car", etc., the hearing aids 1 and 1 'each include a control unit 5 and 5'. The control units 5 and 5 'are connected to memory units 6 and 6' in which different parameter sets for adapting the signal processing units 3 and 3 'to different listening situations are stored.

Die Einstellung der Hörhilfegeräte 1 und 1' an die jeweilige Hörsituation erfolgt durch Betätigung eines Bedienelementes 7 bzw. 7' an wenigstens einem der Hörhilfegeräte 1 bzw. 1'.The adjustment of the hearing aid devices 1 and 1 'to the respective hearing situation takes place by actuation of a control element 7 or 7' on at least one of the hearing aid devices 1 or 1 '.

Bei den Hörhilfegeräten 1 und 1' werden Signallaufzeiten der Signalverarbeitungseinheiten 3 bzw. 3' für die jeweiligen Hörprogramme und unter Berücksichtigung der jeweiligen Einstellungen der Hörhilfegeräte 1 und 1' zum Ausgleich des individuellen Hörverlustes eines Hörgeräteträgers ermittelt. Dies kann beispielsweise durch Laufzeitmessungen während der Anpassung der Hörhilfegeräte 1 und 1' erfolgen. Sind die Signallaufzeiten für beide Hörhilfegeräte 1 und 1' unter den gewählten Einstellungen für die jeweiligen Hörprogramme bekannt, so werden den Hörprogrammen Daten zur Kennzeichnung der Signallaufzeiten zugeordnet und ebenfalls in den Speichereinheiten 6 bzw. 6' abgelegt. Bei diesen Daten kann es sich sowohl um die Signallaufzeiten als solche als auch um die jeweiligen Laufzeitunterschiede zwischen den einzelnen Hörprogrammen oder den Hörhilfegeräten 1 und 1' handeln. Wird nun z.B. bei dem Hörhilfegerät 1 zwischen zwei Hörprogrammen umgeschaltet, so werden aus der Speichereinheit 6 nicht nur die Parameter des neuen Hörprogrammes ausgelesen, sondern auch die dem neu eingestellten Hörprogramm zugeordneten Daten zur Kennzeichnung der Signallaufzeit. Letztere werden dann über eine Sende- und Empfangseinheit 8 an das Hörhilfegerät 1' übertragen. Das Hörhilfegerät 1' empfängt seinerseits mittels der Sende- und Empfangseinheit 8' die von dem Hörhilfegerät 1 gesendeten Daten und führt sie der Steuereinheit 5' zu. Diese wiederum vergleicht die übertragenen Daten mit der in der Speichereinheit 6' gespeicherten Information bezüglich der Laufzeit des aktuell eingestellten Hörprogramms. Beispielsweise durch Steuerung eines Verzögerungsmittels, das im Ausführungsbeispiel als Allpassfilter 9 bzw. 9' ausgeführt ist, lassen sich dann etwaige Laufzeitunterschiede ausgleichen. Vorteilhaft weisen somit beide Hörhilfegeräte 1 bzw. 1' die gleiche Signallaufzeit zwischen dem Eingangswandler 2 und dem Ausgangswandler 4 bzw. dem Eingangswandler 2' und dem Ausgangswandler 4' auf. So wird mit dem Hörgerätesystem 1, 1' stets das Richtungshören ermöglicht, unabhängig von der gerade aktiven Programmpaarung der Hörprogramme beider Hörhilfegeräte 1 und 1'.In the hearing aid devices 1 and 1 ', signal propagation times of the signal processing units 3 and 3' for the respective hearing programs and taking into account the respective settings of the hearing aid devices 1 and 1 'to compensate for the individual hearing loss of a hearing aid wearer are determined. This can be done, for example, by transit time measurements during the adaptation of the hearing aid devices 1 and 1 '. If the signal propagation times for both hearing aid devices 1 and 1 'are known under the selected settings for the respective hearing programs, the hearing programs are assigned data for characterizing the signal propagation times and are likewise stored in the memory units 6 or 6'. These data can be both the signal propagation times as such and also the respective transit time differences between the individual hearing programs or the hearing aid devices 1 and 1 '. If, for example, the hearing aid device 1 is switched between two hearing programs, then not only the parameters of the new hearing program are read from the memory unit 6, but also the data assigned to the newly set hearing program for characterizing the signal delay time. The latter are then transmitted via a transmitting and receiving unit 8 to the hearing aid 1 '. The hearing aid device 1 'receives in turn by means of the transmitting and receiving unit 8' sent by the hearing aid 1 Data and supplies them to the control unit 5 '. This in turn compares the transmitted data with the information stored in the memory unit 6 'regarding the running time of the currently set hearing program. For example, by controlling a delay means, which is designed in the exemplary embodiment as an all-pass filter 9 or 9 ', then any differences in transit time can be compensated. Advantageously, both hearing aid devices 1 and 1 'thus have the same signal propagation delay between the input transducer 2 and the output transducer 4 or the input transducer 2' and the output transducer 4 '. Thus, with the hearing aid system 1, 1 'always directional hearing allows, regardless of the currently active program pairing of the hearing aids both hearing aids 1 and 1'.

Eine anderes Hörgerätesystem zeigt Figur 2. Da auch hierbei beide Hörhilfegeräte des Hörgerätesystems das gleiche Ersatzschaltbild aufweisen, ist in Figur 2 lediglich eines von beiden, nämlich das Hörhilfegerät 11, dargestellt. Auch dieses umfasst wie die Hörhilfegeräte 1 und 1' in dem Ausführungsbeispiel gemäß Figur 1 ein Mikrofon 12 zur Aufnahme eines akustischen Signals und Wandlung in ein elektrisches Signal, eine Signalverarbeitungseinheit 13 zur frequenzabhängigen Verarbeitung des elektrischen Signals und einen Hörer 14 zur Wandlung des elektrischen Signals in ein akustisches Ausgangssignal. Das Hörhilfegerät 11 umfasst ferner einen A/D-Wandler 15 zur Wandlung des Ausgangssignals des Mikrofons in ein digitales Signal sowie einen D/A-Wandler 16 zur Rückverwandlung des digitalen Signals in ein analoges Signal vor der Signalausgabe über den Hörer 14.Another hearing aid system shows FIG. 2 , Since in this case both hearing aids of the hearing aid system have the same equivalent circuit, is in FIG. 2 only one of the two, namely the hearing aid 11, shown. Also this includes as the hearing aids 1 and 1 'in the embodiment according to FIG. 1 a microphone 12 for receiving an acoustic signal and conversion into an electrical signal, a signal processing unit 13 for frequency-dependent processing of the electrical signal and a receiver 14 for converting the electrical signal into an acoustic output signal. The hearing aid device 11 further comprises an A / D converter 15 for converting the output signal of the microphone into a digital signal, and a D / A converter 16 for reconverting the digital signal into an analog signal before the signal output via the receiver 14.

Im Unterschied zu Figur 1 erfolgt bei dem Hörhilfegerät 11 gemäß Figur 2 eine Signalanalyse des digitalen elektrischen Eingangssignals in einer Analyse- und Steuereinheit 17. Auch diese ist mit einer Speichereinheit 18 verbunden, in der unterschiedliche, die Signalverarbeitung betreffende Speichersätze speicherbar sind. Neben der Möglichkeit der Steuerung der Signalverarbeitung im Hörhilfegerät 11 durch einen kompletten Parametersatz, der in der Speichereinheit 18 gespeichert ist, ist bei dem Hörhilfegerät 11 vorgesehen, auch nur einzelne Einstellungen und Parameter zur Einstellung der Signalverarbeitung an die jeweilige Hörsituation adaptiv zu verändern. Auch können gegebenenfalls bestimmte Funktionen oder Algorithmen ein- bzw. ausgeschaltet werden. So kann bei dem Hörhilfegerät bei erkannter Sprache ein Algorithmus zur Sprachanhebung eingestellt werden oder es kann bei erkannten Störgeräuschen ein Algorithmus zur Störgeräuschbefreiung aktiv geschaltet werden. Es ist somit eine Vielzahl unterschiedlicher Einstellungen und Funktionen möglich, die zumeist Auswirkungen auf die Signallaufzeit eines Signals durch das Hörhilfegerät 11 haben. Daher wird bei dem Hörhilfegerät 11 die Signallaufzeit unter Berücksichtigung der aktuellen Einstellungen und Funktionen automatisch ermittelt. Hierzu weist das Hörhilfegerät 11 eine Laufzeitermittlungseinheit 19 auf. Diese umfasst einen Signalgenerator zum Erzeugen und Einspeisen eines synthetischen Signals in den Signalpfad. Das eingespeiste Signal durchläuft die Signalverarbeitungseinheit 13 und wird vor der Ausgabe über den Hörer 14 abgegriffen und der Laufzeitermittlungseinheit 19 zugeführt. Vorzugsweise liegt das erzeugte Signal in einem von dem Hörgeräteträger akustisch nicht wahrnehmbaren Frequenzbereich. Durch die Laufzeitermittlungseinheit 19 kann nun die Signallaufzeit durch die Signalverarbeitungseinheit 13 gemessen und an die Analyse- und Steuereinheit 17 übertragen werden. Die Laufzeitmessung wird vorteilhaft immer dann durchgeführt, wenn sich bei dem Hörhilfegerät 11 eine Parameter- oder Funktionsänderung ergeben hat. Die ermittelten, die Signallaufzeit betreffenden Daten werden schließlich über eine Sende- und Empfangseinheit 20 auf das zweite Hörhilfegerät (nicht dargestellt) des Hörgerätesystems übertragen. Ebenso empfängt auch das Hörhilfegerät 11 mittels der Sende- und Empfangseinheit 20 die augenblickliche Signallaufzeit durch die Signalverarbeitungseinheit des zweiten Hörhilfegerätes. In der Analyse- und Steuereinheit 17 liegt somit die Information bezüglich der Signallaufzeiten beider Hörhilfegeräte des Hörgerätesystems vor. Bei dem Hörhilfegerät mit der kürzeren ermittelten Signallaufzeit, im Ausführungsbeispiel das Hörhilfegerät 11, wird nachfolgend eine Signalverzögerung um die Differenz der in beiden Hörhilfegeräten ermittelten Signallaufzeiten durchgeführt. Hierzu umfasst das Hörhilfegerät 11 eine als Schieberegister 21 ausgebildete Verzögerungseinheit. Bei diesem ist die Anzahl der Verzögerungstakte durch die Analyse- und Steuereinheit 17 einstellbar. Vorteilhaft wird so auch bei dieser Ausführungsform erreicht, dass zum Durchlauf eines akustischen Eingangssignals parallel durch zwei Hörhilfegeräte eines Hörgerätesystems die gleiche Signallaufzeit benötigt wird.In contrast to FIG. 1 takes place according to the hearing aid device 11 FIG. 2 a signal analysis of the digital electrical input signal in an analysis and control unit 17. Also, this is connected to a memory unit 18 in which different, the signal processing processing memory sets are stored. In addition to the possibility of controlling the signal processing in the hearing aid 11 by a complete set of parameters, which is stored in the memory unit 18, it is provided in the hearing aid 11, even adaptively change only individual settings and parameters for adjusting the signal processing to the respective hearing situation. Also, if necessary, certain functions or algorithms can be switched on or off. Thus, in the case of a recognized speech, an algorithm for speech enhancement can be set in the hearing aid device, or an algorithm for noise suppression can be activated when detected noises. Thus, a multiplicity of different settings and functions are possible which mostly have effects on the signal propagation time of a signal by the hearing aid device 11. Therefore, in the hearing aid device 11, the signal propagation time is automatically determined taking into account the current settings and functions. For this purpose, the hearing aid device 11 has a transit time determination unit 19. This includes a signal generator for generating and injecting a synthetic signal into the signal path. The fed-in signal passes through the signal processing unit 13 and is tapped before the output via the handset 14 and fed to the transit time determination unit 19. Preferably, the generated signal lies in a frequency range which is not audible acoustically by the hearing aid wearer. By the transit time determination unit 19, the signal transit time can now be measured by the signal processing unit 13 and transmitted to the analysis and control unit 17. The transit time measurement is advantageously carried out whenever a parameter or functional change has occurred in the hearing aid device 11. The determined data relating to the signal transit time are finally transmitted via a transmitting and receiving unit 20 to the second hearing aid device (not shown) of the hearing aid system. Likewise, the hearing aid device 11 also receives the instantaneous signal transit time by means of the transmitting and receiving unit 20 through the signal processing unit of the second hearing aid device. In the analysis and control unit 17 is thus the information regarding the signal propagation times of both hearing aids of the hearing aid system. In the hearing aid with the shorter signal propagation time determined, in the exemplary embodiment the hearing aid device 11, a signal delay is subsequently performed by the difference of the signal propagation times determined in both hearing aid devices. For this purpose, the hearing aid device 11 comprises a delay unit designed as a shift register 21. In this case, the number of delay clocks by the analysis and control unit 17 is adjustable. Advantageously, it is thus also achieved in this embodiment that the passage of an acoustic input signal in parallel through two hearing aid devices of a hearing aid system requires the same signal propagation time.

Ein weiteres Hörhilfegerät ist in Figur 3 dargestellt. Dabei zeigt ein Hörhilfegerät 22 einen zum Hörhilfegerät gemäß Figur 2 sehr ähnlichen Aufbau. Im Unterschied zu dem Hörhilfegerät 11 gemäß Figur 2 weist das Hörhilfegerät 22 jedoch einen Taktgenerator 23 mit einstellbarer Taktfrequenz auf. Mittels des einstellbaren Taktgenerators 23 ist der Systemtakt des Hörhilfegerätes 22 einstellbar. Abhängig vom Systemtakt ist damit die Signallaufzeit eines Signals durch das Hörhilfegerät 22 veränderbar. Wird in analoger Weise zu dem in Figur 2 beschriebenen Hörhilfegerät festgestellt, dass die Signallaufzeit gegenüber einem zweiten Hörhilfegerät des Hörgerätesystems länger ist, so wird zum Ausgleich der Laufzeitdifferenz die Taktfrequenz so weit erhöht, bis der Laufzeitunterschied ausgeglichen ist. Entsprechend wird bei einer für das Hörhilfegerät 22 ermittelten kürzeren Signallaufzeit die Taktfrequenz des Hörhilfegerätes 22 so weit reduziert, dass die Signallaufzeiten angeglichen sind.Another hearing aid is in FIG. 3 shown. In this case, a hearing aid 22 shows a hearing aid according to FIG. 2 very similar construction. In contrast to the hearing aid 11 according to FIG. 2 However, the hearing aid 22 has a clock generator 23 with adjustable clock frequency. By means of the adjustable clock generator 23, the system clock of the hearing aid 22 is adjustable. Depending on the system clock so that the signal delay of a signal by the hearing aid 22 is changeable. Is used in an analogous manner to the in FIG. 2 described hearing aid that the signal propagation time is longer compared to a second hearing aid device of the hearing aid system, so the clock frequency is increased so far to compensate for the delay difference until the delay difference is compensated. Accordingly, the clock frequency of the hearing aid device 22 is reduced so far that the signal propagation times are equalized at a shorter signal propagation time determined for the hearing aid device 22.

Bei einer bevorzugten Ausführungsform der Erfindung erfolgt neben dem Ausgleich der Signallaufzeiten bei geänderten Einstellungen und Funktionen wenigstens eines Hörhilfegerätes auch ein Amplitudenausgleich. Hierzu können z.B. analog zum Ausgleich der Signallaufzeiten bei den Hörhilfegeräten 1 und 1' gemäß Figur 1 Verstärkungswerte ermittelt werden und diesbezügliche Daten in den Speichereinheiten 6 und 6' gespeichert werden. Bei einer Verstärkungsänderung bei einem der beiden Hörhilfegeräte infolge einer Parameter- und/oder Funktionsänderung (z.B. Wechsel des Hörprogramms) wird dann die Verstärkung in dem anderen Hörhilfegerät entsprechend angepasst.In a preferred embodiment of the invention, in addition to the compensation of the signal propagation times at changed settings and functions at least a hearing aid and an amplitude compensation. For this purpose, for example, analogously to the compensation of the signal propagation times in the hearing aid devices 1 and 1 'according to FIG. 1 Gain values are determined and related data stored in the memory units 6 and 6 '. In a gain change in one of the two hearing aids as a result of a parameter and / or functional change (eg changing the hearing program) then the gain in the other hearing aid is adjusted accordingly.

Auch bei den beispielhaft in den Figuren 2 und 3 veranschaulichten Hörhilfegeräten kann ein Amplitudenausgleich erfolgen. Hierbei wird vorteilhaft über die Messeinrichtung 19 ein Testsignal in den Signalpfad eingespeist und an einer späteren Stelle im Signalpfad, vorzugsweise nach der Signalverarbeitungseinheit 13, wieder abgegriffen. Neben der Signallaufzeit wird so vorteilhaft auch das Signalübertragungsverhalten hinsichtlich der Signalamplituden gemessen. Vorzugsweise erfolgt die Messung bei unterschiedlichen Frequenzen. So kann für unterschiedliche Frequenzen jeweils ein bestimmter Verstärkungswert festgestellt werden. Daten bezüglich der so ermittelten Verstärkungswerte werden dann auf das jeweils andere Hörhilfegerät des Hörgerätesystems übertragen. Nachfolgend erfolgt ein Abgleich der Signalamplituden, wobei bei wenigstens einem der Hörhilfegeräte die Verstärkung geändert oder Filtermittel eingestellt werden. Vorteilhaft folgt der Abgleich der Signalamplituden unter Berücksichtigung der bei beiden Ohren gemessenen Audiogramme. Daten bezüglich dieser Audiogramme können ebenfalls in den Speichereinheiten 18 gespeichert sein. Der Lautheitsausgleich erfolgt dann in Relation zu den Audiogrammen, womit erreicht wird, dass beispielsweise eine durch eine Parameteränderung an einem Hörhilfegerät hervorgerufene geringfügige Lautheitsänderung eine für den Hörgeräteträger subjektiv gleiche Lautheitsänderung an dem anderen Hörhilfegerät bewirkt. Dadurch werden geringfügige Lautheitsunterschiede an den beiden Ohren eines Hörgeräteträgers unabhängig von den aktuellen Hörgeräteeinstellungen stets gleich wahrgenommen.Also with the example in the FIGS. 2 and 3 illustrated hearing aids, an amplitude compensation can be done. Here, a test signal is advantageously fed via the measuring device 19 into the signal path and picked up again at a later point in the signal path, preferably after the signal processing unit 13. In addition to the signal propagation time, the signal transmission behavior with regard to the signal amplitudes is also measured so advantageously. Preferably, the measurement is carried out at different frequencies. Thus, a different gain value can be determined for different frequencies. Data relating to the amplification values thus determined are then transmitted to the respective other hearing aid device of the hearing aid system. Subsequently, an adjustment of the signal amplitudes takes place, with at least one of the hearing aid devices changing the gain or setting filter means. Advantageously, the adjustment of the signal amplitudes follows, taking into account the audiograms measured in both ears. Data regarding these audiograms may also be stored in the storage units 18. The loudness compensation then takes place in relation to the audiograms, which ensures that, for example, a slight loudness change caused by a parameter change on a hearing aid device causes a loudness change subjectively the same for the hearing aid wearer on the other hearing aid. As a result, slight loudness differences in the two ears of a hearing aid wearer are always perceived the same regardless of the current hearing aid settings.

Ein weiteres Ausführungsbeispiel der Erfindung ist in Figur 4 dargestellt. Auch Figur 4 zeigt nur ein Hörhilfegerät 24 eines Hörgerätesystems mit zwei identisch aufgebauten Hörhilfegeräten. Das Hörhilfegerät 24 umfasst zwei Mikrofone 25 und 26, deren Ausgangssignale einer Signalvorverarbeitungseinheit 27 zugeführt sind. In der Signalvorverarbeitungseinheit 27 erfolgt eine A/D-Wandlung und eine elektrische Verschaltung der Mikrofonsignale zur Erzeugung einer Richtmikrofoncharakteristik. Eine Filterbank 28 dient zur Aufspaltung des elektrischen Signals in Frequenzbänder. In Signalverarbeitungseinheiten 29A, 29B, 29C und 29D erfolgt dann eine frequenzbandspezifische Signalverarbeitung der elektrischen Signale in den einzelnen Frequenzbändern. Schließlich werden die Ausgangssignale der Signalverarbeitungseinheiten 29A bis 29D addiert und in einer Signalnachverarbeitungseinheit 30 nachverarbeitet. Die Signalnachverarbeitung kann beispielsweise eine Endverstärkung und D/A-Wandlung umfassen. Schließlich wird das analoge elektrische Ausgangssignal durch einen Hörer 31 in ein akustisches Ausgangssignal zurückverwandelt. Die einzelnen Signalverarbeitungsblöcke des Hörhilfegerätes, also die Signalvorverarbeitungseinheit 27, die Filterbank 28, die Signalverarbeitungseinheiten 29A bis 29D in den einzelnen Kanälen sowie die Signalnachverarbeitungseinheit 30, sind im Ausführungsbeispiel zusammengefasst als Signalverarbeitungseinheit 29 bezeichnet.Another embodiment of the invention is in FIG. 4 shown. Also FIG. 4 shows only a hearing aid 24 of a hearing aid system with two identically constructed hearing aids. The hearing aid device 24 comprises two microphones 25 and 26 whose output signals are fed to a signal preprocessing unit 27. In the signal pre-processing unit 27, an A / D conversion and an electrical connection of the microphone signals to produce a directional microphone characteristic. A filter bank 28 serves to split the electrical signal into frequency bands. In signal processing units 29A, 29B, 29C and 29D, a frequency band-specific signal processing of the electrical signals in the individual frequency bands then takes place. Finally, the output signals of the signal processing units 29A to 29D are added and post-processed in a signal post-processing unit 30. The signal post-processing may include, for example, an end gain and D / A conversion. Finally, the analog electrical output signal is converted back into an acoustic output signal by a receiver 31. The individual signal processing blocks of the hearing aid device, that is to say the signal preprocessing unit 27, the filter bank 28, the signal processing units 29A to 29D in the individual channels, and the signal postprocessing unit 30, are collectively referred to as signal processing unit 29 in the exemplary embodiment.

Auch bei dem Hörhilfegerät 24 in diesem Ausführungsbeispiel sind unterschiedliche Hörprogramme zur Anpassung der Signalverarbeitung im Hörhilfegerät an unterschiedliche Hörsituationen vorgesehen. Entsprechende Parametersätze sind in einer Speichereinheit 32 hinterlegt. Zum Erkennen der augenblicklichen Hörsituation weist das Hörhilfegerät 24 eine Signalanalyse- und Steuereinheit 33 auf, in die das elektrische Eingangssignal vor der Aufteilung in unterschiedliche Frequenzbänder sowie das elektrische Ausgangssignal nach Durchlauf der Signalverarbeitungseinheiten 29A bis 29D eingehen. Mittels der Signalanalyse- und Steuereinheit 33 können beispielsweise rückkopplungsbedingte Oszillationen in dem elektrischen Eingangssignal erkannt werden. Als Gegenmaßnahme gegen erkannte rückkopplungsbedingte Oszillationen kann dann in einem Frequenzband, in dem die Oszillationsfrequenz liegt, beispielsweise die Verstärkung herabgesetzt werden. Daten bezüglich dieser Verstärkungsänderung in dem betreffenden Kanal werden dann von der Signalanalyse- und Steuereinheit 33 erfasst und mittels einer Sende- und Empfangseinheit 34 auf das zweite Hörhilfegerät (nicht dargestellt) übertragen. Dieses empfängt die übertragenen Daten und senkt seinerseits die Verstärkung in dem entsprechenden Kanal mittels einer der Signalanalyse- und Steuereinheit des Hörhilfegerätes 24 entsprechenden Signalanalyse- und Steuereinheit. Ebenso können auch Daten bezüglich einer Verstärkungsänderung in dem zweiten Hörhilfegerät des Hörgerätesystems auf das Hörhilfegerät 24 übertragen werden, das mittels der Signalanalyse- und Steuereinheit 33 auf Komponenten (beispielsweise die Signalverarbeitungseinheiten 29A bis 29D in den einzelnen Kanälen) steuernd einwirkt und die Verstärkung bei dem Hörhilfegerät 24 entsprechend anpasst.Also in the hearing aid device 24 in this embodiment, different hearing programs for adapting the signal processing in the hearing aid to different listening situations are provided. Corresponding parameter sets are stored in a memory unit 32. For recognizing the instantaneous hearing situation, the hearing aid device 24 has a signal analysis and control unit 33, into which the electrical input signal before dividing into different frequency bands and the electrical output signal after passing through the signal processing units 29A to 29D. By means of the signal analysis and control unit 33, for example, feedback-related oscillations in the electrical input signal can be detected. As a countermeasure against detected feedback oscillations, for example, in a frequency band in which the oscillation frequency is located, the gain may be reduced. Data relating to this gain change in the relevant channel are then acquired by the signal analysis and control unit 33 and transmitted by means of a transmitting and receiving unit 34 to the second hearing aid (not shown). This receives the transmitted data and in turn lowers the gain in the corresponding channel by means of a signal analysis and control unit of the hearing aid 24 corresponding signal analysis and control unit. Likewise, data relating to a change in gain in the second hearing aid device of the hearing aid system can also be transmitted to the hearing aid device 24, which acts by means of the signal analysis and control unit 33 on components (for example the signal processing units 29A to 29D in the individual channels) and the gain in the hearing aid device 24 adapts accordingly.

Die Verstärkungsänderung kann in beiden Hörhilfegeräten um den gleichen Betrag erfolgen. Vorzugsweise erfolgt sie jedoch unter Berücksichtigung des individuellen Hörverlustes des Hörgeräteträgers sowie der Signalübertragungskennlinien der Hörhilfegeräte. Der Hörgeräteträger nimmt dann subjektiv die gleiche Verstärkungsreduzierung an beiden Hörhilfegeräten wahr. Natürliche Lautheitsunterschiede in den akustischen Eingangssignalen bleiben dadurch für den Hörgeräteträger weitgehend erhalten.The gain change can be made in both hearing aids by the same amount. Preferably, however, it takes place taking into account the individual hearing loss of the hearing device wearer and the signal transmission characteristics of the hearing aid devices. The hearing aid wearer then subjectively perceives the same gain reduction on both hearing aids. Natural loudness differences in the acoustic input signals remain largely preserved for the hearing aid wearer.

Häufig führen Parameter- oder Funktionsänderungen bei Hörhilfegeräten infolge der aktuellen Hörsituation nicht zu vorbestimmten Verstärkungsänderungen. Dies ist beispielsweise bei Hörhilfegeräten der Fall, bei denen nicht komplette Parametersätze zur Anpassung an unterschiedliche Hörsituationen vorgegeben sind, sondern bei denen eine adaptive und kontinuierliche Anpassung einzelner Parameter erfolgt. Eine Verstärkungsänderung wird dann vorteilhaft durch eine Hörhilfegeräte interne Messung ermittelt. So kann bei dem Hörhilfegerät gemäß Figur 4 die Verstärkungsänderung aus Messungen der Verstärkung vor und nach einer Parameteränderung festgestellt werden. Hierzu werden das elektrische Eingangssignal sowie das elektrische Ausgangssignal in der Signalanalyse- und Steuereinheit 33 ausgewertet. Bei dem Ausführungsbeispiel gemäß Figur 4 ist sowohl eine Auswertung des Gesamteingangs- bzw. -ausgangssignals als auch der elektrischen Eingangs- und Ausgangssignale der Signalverarbeitungseinheiten 29A bis 29D der einzelnen Kanäle möglich, je nachdem, ob eine Parameteränderung den gesamten Frequenzbereich oder nur Signalfrequenzen innerhalb eines Frequenzbandes betrifft.Frequently, parameter or functional changes in hearing aids result as a result of the current hearing situation not to predetermined gain changes. This is the case, for example, with hearing aid devices in which complete sets of parameters for adaptation to different listening situations are not predetermined, but in which an adaptive and continuous adaptation of individual parameters takes place. A gain change is then advantageously determined by a hearing aid internal measurement. Thus, in the hearing aid according to FIG. 4 the gain change can be determined from measurements of the gain before and after a parameter change. For this purpose, the electrical input signal and the electrical output signal in the signal analysis and control unit 33 are evaluated. In the embodiment according to FIG. 4 Both an evaluation of the total input or output signal and the electrical input and output signals of the signal processing units 29A to 29D of the individual channels is possible, depending on whether a change in the parameter affects the entire frequency range or only signal frequencies within a frequency band.

Analog zu der Anpassung der Verstärkung können bei einem Hörgerätesystem mit zwei Hörhilfegeräten mit einem schematischen Blockschaltbild gemäß dem beispielhaften Hörhilfegerät 24, wie in Figur 4 dargestellt, auch die Signalamplituden oder die Signallaufzeiten der beiden Hörhilfegeräte einander angepasst werden, so dass das natürliche Richtungshören auch bei getragenen Hörhilfegeräten erhalten bleibt. Hierbei sind für den Amplituden- oder Laufzeitausgleich gegenüber dem Verstärkungsausgleich lediglich andere Signalanalysemethoden in der Signalanalyse- und Steuereinheit 33 vorzusehen. So gehen dem Amplitudenausgleich beispielsweise Amplituden- oder Pegelmessungen oder dem Laufzeitausgleich Phasen- oder Signallaufzeitmessungen an dem Gesamtsignal oder in den einzelnen Kanälen des Hörhilfegerätes 24 voraus. Der Ausgleich erfolgt dann vorzugsweise durch einstellbare Filtermittel innerhalb der Signalverarbeitungseinheit 29, die durch die Signalanalyse- und Steuereinheit 33 eingestellt werden.Analogous to the adjustment of the amplification can in a hearing aid system with two hearing aids with a schematic block diagram according to the exemplary hearing aid device 24, as in FIG. 4 represented, the signal amplitudes or the signal propagation times of the two hearing aids are adapted to each other, so that the natural directional hearing is maintained even with worn hearing aids. In this case, only other signal analysis methods in the signal analysis and control unit 33 are provided for the amplitude or delay compensation over the gain compensation. For example, the amplitude compensation is preceded by amplitude or level measurements or the delay compensation phase or signal propagation time measurements on the overall signal or in the individual channels of the hearing aid device 24. The compensation is then preferably carried out by adjustable filter means within the signal processing unit 29, which are set by the signal analysis and control unit 33.

Bei einer bevorzugten Variante wird zur Laufzeitmessung eine Korrelationsanalyse durchgeführt. Hierzu sind der Signalanalyse- und Steuereinheit 33 elektrische Signale aus hintereinanderliegenden Punkten in dem Signalpfad zwischen den Mikrofonen 25 und 26 und dem Hörer 31 zugeführt. Mittels der Korrelationsanalyse kann dann die Phasenverschiebung und damit die Signallaufzeit auf einfache Weise ermittelt werden.In a preferred variant, a correlation analysis is performed for the transit time measurement. For this purpose, the signal analysis and control unit 33 electrical signals from successive points in the signal path between the microphones 25 and 26 and the handset 31 are supplied. By means of the correlation analysis, the phase shift and thus the signal propagation time can then be determined in a simple manner.

Bei einer weiteren bevorzugten Variante werden in der Signalanalyse- und Steuereinheit zunächst die Einhüllenden der zugeführten Signale ermittelt. Auch aus dem Vergleich der Einhüllenden in der Signalanalyse- und Auswerteeinheit 33 kann leicht auf die Phasenverschiebung der betreffenden Signale und damit auf die Signallaufzeit zwischen den betrachteten Punkten in dem Signalpfad des Hörhilfegerätes 24 rückgeschlossen werden.In a further preferred variant, the envelopes of the supplied signals are first determined in the signal analysis and control unit. The comparison of the envelopes in the signal analysis and evaluation unit 33 also makes it easy to deduce the phase shift of the relevant signals and thus the signal propagation time between the points of interest in the signal path of the hearing aid device 24.

Die Messungen erfolgen insbesondere jeweils kurz vor sowie kurz nach Parameter- oder Funktionsänderungen in dem Hörhilfegerät 24, um die dadurch bedingten Verstärkungs- und/oder Amplituden- und/oder Signallaufzeitänderungen bei dem Hörhilfegerät 24 zu erfassen, diesbezügliche Daten auf das zweite Hörhilfegerät des Hörgerätesystems zu übertragen, dort zu empfangen, auszuwerten und schließlich die Änderungen auszugleichen.The measurements are carried out in each case shortly before and shortly after parameter or functional changes in the hearing aid device 24 in order to detect the resulting amplification and / or amplitude and / or signal propagation time changes in the hearing aid device 24, related data to the second hearing aid device of the hearing aid system transmit, receive there, evaluate and finally compensate for the changes.

Zusammenfassend wird festgehalten:
Bei der binauralen Versorgung eines Hörgeräteträgers mit zwei am Ohren tragbaren Hörhilfegeräten soll das Richtungshören verbessert werden. Hierzu schlägt die Erfindung vor, jeweils Signalamplituden und/oder Verstärkungen eines elektrischen Signals in einem Signalpfad zwischen einem Eingangswandler und einem Ausgangswandler eines Hörhilfegerätes zu messen und Daten bezüglich der gemessenen Signalamplituden und/oder Verstärkungen auf das jeweils andere Hörhilfegerät zu übertragen. Dadurch können die Signalamplituden der elektrischen Signale durch die beiden Hörhilfegeräte aneinander angepasst werden. Damit wird durch die Hörhilfegeräte keine Amplitudenverzerrung verursacht und der natürliche Amplitudenunterschied eines aus einer bestimmten Richtung einfallenden Schallsignals bleiben erhalten. Somit bleibt auch die Richtungsinformation für den Hörgeräteträger erhalten.
In summary, it is stated:
In the binaural care of a hearing aid wearer with two hearing aids that can be worn on the ear, directional hearing should be improved. For this purpose, the invention proposes in each case to measure signal amplitudes and / or amplifications of an electrical signal in a signal path between an input transducer and an output transducer of a hearing aid device and to transmit data relating to the measured signal amplitudes and / or amplifications to the respective other hearing aid device. As a result, the signal amplitudes of the electrical signals can be matched to each other by the two hearing aids. Thus, no amplitude distortion is caused by the hearing aids and the natural amplitude difference of an incident from a particular direction sound signal is maintained. Thus, the direction information for the hearing aid wearer is retained.

Claims (22)

  1. Method for the adjustment of a hearing aid system having at least one first (1, 11, 22, 24) and a second (1') hearing aid which each comprise at least one input transducer (2, 2' , 12, 25, 26) for picking up an audible input signal and converting it into an electrical signal, a signal processing unit (3, 3', 13, 29) for processing the electrical signal, and an output transducer (4, 4', 14, 31) for converting the electrical signal into an output signal, and between which a signal path (10) is provided for the purpose of data transmission, a gain or gain change of the electrical signal being ascertained in the signal path between the input transducer (2, 12, 25, 26) and the output transducer (4, 14, 31) of the first hearing aid (1, 11, 22, 24) and a signal being transmitted via the signal path (10) to the second hearing aid (1') for the purpose of matching the gain of the electrical signal in the signal path between the input transducer (2') and the output transducer (4') of the second hearing aid (1') to the ascertained gain of the electrical signal in the first hearing aid (1, 11, 22, 24) characterized in that the gain or gain change is ascertained by ascertaining signal amplitudes and/or signal levels of the electrical signal.
  2. Method according to Claim 1, characterized in that the gain or gain change of the electrical signal is ascertained for a subregion of the signal path between the input transducer (2, 12, 25, 26) and the output transducer (4, 14, 31) of the first hearing aid (1, 11, 22, 24).
  3. Method according to Claim 1 or 2, characterized in that the gain or gain change of the electrical signal is automatically ascertained in the first hearing aid (1, 11, 22, 24) and a signal is transmitted to the second hearing aid (1').
  4. Method according to one of Claims 1 to 3,
    characterized in that the gain or gain change is ascertained by producing a test signal which at least partially transits the signal path between the input transducer (2, 12, 25, 26) and the output transducer (4, 14, 31) of the first hearing aid (1, 11, 22, 24).
  5. Method according to one of Claims 1 to 4,
    characterized in that the gain or gain change is ascertained in the first (1, 11, 22, 24) and the second (1') hearing aid and a respective signal is transmitted to the other hearing aid.
  6. Method according to one of Claims 1 to 5,
    characterized in that the gain is matched by adjusting filter means (9, 9').
  7. Method according to one of Claims 1 to 6,
    characterized in that the gain or gain change is ascertained and matched at periodic intervals.
  8. Method according to one of Claims 1 to 7,
    characterized in that the gain is ascertained and matched subsequent to a parameter and/or function change in at least one of the hearing aids (1, 1', 11, 22, 24).
  9. Method according to one of Claims 1 to 8,
    characterized in that the signal processing in the first (1, 11, 22, 24) and the second (1') hearing aid is effected in a plurality of parallel frequency channels of the respective signal processing unit (3, 13, 29), and the gain is ascertained and matched in at least one frequency channel in each case.
  10. Method for the adjustment of a hearing aid system having at least one first (1, 11, 22, 24) and a second (1') hearing aid which each comprise at least one input transducer (2, 2', 12, 25, 26) for picking up an audible input signal and converting it into an electrical signal, a signal processing unit (3, 3', 13, 29) for processing the electrical signal, and an output transducer (4, 4', 14, 31) for converting the electrical signal into an output signal, and between which a signal path (10) is provided for the purpose of data transmission, a signal amplitude of the electrical signal being ascertained in the signal path between the input transducer (2, 12, 25, 26) and the output transducer (4, 14, 31) of the first hearing aid (1, 11, 22, 24), and a signal being transmitted via the signal path (10) to the second hearing aid (1') for the purpose of matching the signal amplitude of the electrical signal in the signal path between the input transducer (2') and the output transducer (4') of the second hearing aid (1') to the ascertained signal amplitude of the electrical signal in the first hearing aid (1, 11, 22, 24), characterized in that the signal amplitude is ascertained by producing a test signal which at least partially transits the signal path between the input transducer (2, 12, 25, 26) and the output transducer (4, 14, 31) of the first hearing aid (1, 11, 22, 24).
  11. Method according to Claim 10, characterized in that the signal amplitude of the electrical signal is automatically ascertained in the first hearing aid (1, 11, 22, 24) and a signal is transmitted to the second hearing aid (1').
  12. Method according to one of Claims 10 to 11,
    characterized in that the signal amplitude is ascertained in the first (1, 11, 22, 24) and the second (1') hearing aid and a respective signal is transmitted to the other hearing aid.
  13. Method according to one of Claims 10 to 12,
    characterized in that the signal amplitude is matched by adjusting filter means (9, 9').
  14. Method according to one of Claims 10 to 13,
    characterized in that the signal amplitude is ascertained and matched at periodic intervals.
  15. Method according to one of Claims 10 to 14,
    characterized in that the signal amplitude is ascertained and matched subsequent to a parameter and/or function change in at least one of the hearing aids (1, 1', 11, 22, 24).
  16. Method according to one of Claims 10 to 15,
    characterized in that the signal processing in the first (1, 11, 22, 24) and the second (1') hearing aid is effected in a plurality of parallel frequency channels of the respective signal processing unit (3, 13, 29), and the signal amplitudes are ascertained and matched in at least one frequency channel in each case.
  17. Hearing aid system having at least one first (1, 11, 22, 24) and a second (1') hearing aid which each comprise at least one input transducer (2, 2', 12, 25, 26) for picking up an audible input signal and converting it into an electrical signal, a signal processing unit (3, 3', 13, 29) for processing the electrical signal, and an output transducer (4, 4', 14, 31) for converting the electrical signal into an output signal, and between which a signal path (10) is provided for the purpose of data transmission,
    characterized in that the first hearing aid (1, 11, 22, 24) comprises means for measuring and means for sending data regarding a gain or gain change of an electrical signal in the signal path between the input transducer (2, 12, 25, 26) and the output transducer (4, 14, 31) of the first hearing aid (1, 11, 22, 24), and the second hearing aid (1') comprises means for receiving the sent data and means for matching a gain in the signal path between the input transducer (2') and the output transducer (4') of the second hearing aid (1') to the gain or gain change of the electrical signal in the first hearing aid (1, 11, 22, 24).
  18. Hearing aid system according to Claim 17, characterized in that the signal processing in the first (1, 11, 22, 24) and the second (1') hearing aid is effected in a plurality of parallel frequency channels of the respective signal processing unit (3, 3', 13, 29), and at least the first hearing aid (1, 11, 22, 24) comprises means for ascertaining the gain or gain change, and at least the second hearing aid (1') comprises means for matching the gain in at least one frequency channel.
  19. Hearing aid system having at least one first (1, 11, 22, 24) and a second (1') hearing aid which each comprise at least one input transducer (2, 2', 12, 25, 26) for picking up an audible input signal and converting it into an electrical signal, a signal processing unit (3, 3', 13, 29) for processing the electrical signal, and an output transducer (4, 4', 14, 31) for converting the electrical signal into an output signal, and between which a signal path (10) is provided for the purpose of data transmission,
    characterized in that the first hearing aid (1, 11, 22, 24) comprises means for measuring and means for sending data regarding a signal amplitude of an electrical signal in the signal path between the input transducer (2, 12, 25, 26) and the output transducer (4, 14, 31) of the first hearing aid (1, 11, 22, 24), and the second hearing aid (1') comprises means for receiving the sent data and means for matching a signal amplitude in the signal path between the input transducer (2') and the output transducer (4') of the second hearing aid (1') to the signal amplitude of the electrical signal in the first hearing aid (1, 11, 22, 24).
  20. Hearing aid system according to Claim 19, characterized in that the signal processing in the first (1, 11, 22, 24) and the second (1') hearing aid is effected in a plurality of parallel frequency channels of the respective signal processing unit (3, 3', 13, 29), and at least the first hearing aid (1, 11, 22, 24) comprises means for ascertaining the signal amplitude, and at least the second hearing aid (1') comprises means for matching the signal amplitude in at least one frequency channel.
  21. Hearing aid system according to Claim 19 or 20,
    characterized in that the first hearing aid (1, 11, 22, 24) comprises at least one transmission unit (8, 8', 20, 34), and the second hearing aid (1') comprises at least one reception unit (8'), for the wireless signal transmission between the first (1, 11, 22, 24) hearing aid and the second (1') hearing aid.
  22. Hearing aid system according to one of Claims 19 to 21, characterized in that at least the first (1, 11, 22, 24) hearing aid comprises means for producing a test signal.
EP10000610.5A 2002-06-26 2003-06-13 Sound localization in binaural hearing aids Expired - Lifetime EP2180726B2 (en)

Applications Claiming Priority (2)

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DE10228632A DE10228632B3 (en) 2002-06-26 2002-06-26 Directional hearing with binaural hearing aid care
EP03013553A EP1379102B1 (en) 2002-06-26 2003-06-13 Sound localization in binaural hearing aids

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EP03013553.7 Division 2003-06-13

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EP2180726B1 EP2180726B1 (en) 2011-02-23
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EP2180726B1 (en) 2011-02-23
DK2180726T4 (en) 2015-02-16
EP1379102A3 (en) 2009-03-04
DE10228632B3 (en) 2004-01-15
DE50313499D1 (en) 2011-04-07
EP2180726A1 (en) 2010-04-28
US7474758B2 (en) 2009-01-06
DK1379102T3 (en) 2010-11-08
DE50312941D1 (en) 2010-09-16
DK2180726T3 (en) 2011-06-14
US20040057591A1 (en) 2004-03-25
EP1379102B1 (en) 2010-08-04
EP1379102A2 (en) 2004-01-07

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