EP1912471B1 - Verarbeitung eines Eingangssignals in einer Hörhilfe - Google Patents

Verarbeitung eines Eingangssignals in einer Hörhilfe Download PDF

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Publication number
EP1912471B1
EP1912471B1 EP07117164.9A EP07117164A EP1912471B1 EP 1912471 B1 EP1912471 B1 EP 1912471B1 EP 07117164 A EP07117164 A EP 07117164A EP 1912471 B1 EP1912471 B1 EP 1912471B1
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EP
European Patent Office
Prior art keywords
signal
input signal
output
correlation
output signal
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Not-in-force
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EP07117164.9A
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German (de)
English (en)
French (fr)
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EP1912471A3 (de
EP1912471A2 (de
Inventor
Eghart Fischer
Matthias Fröhlich
Jens Hain
Henning Puder
André Steinbuß
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Sivantos GmbH
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Sivantos GmbH
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Publication of EP1912471A3 publication Critical patent/EP1912471A3/de
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Publication of EP1912471B1 publication Critical patent/EP1912471B1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/41—Detection or adaptation of hearing aid parameters or programs to listening situation, e.g. pub, forest

Definitions

  • the invention relates to a method for processing an input signal in a hearing aid, and to a device for processing an input signal in a hearing aid.
  • a simple amplification of an input signal from a microphone often leads to an unsatisfactory hearing aid for the user, since interference signals are also amplified and the user's use is limited to specific acoustic situations.
  • digital signal processors are already installed in hearing aids that process the signal of one or more microphones digitally, so as to suppress, for example, deliberately noise.
  • BSS Blind Source Separation a so-called blind source separation (BSS Blind Source Separation) in order to assign components of an input signal to different sources and to generate corresponding individual signals.
  • BSS system can split the input signal of two microphones into two individual signals, one of which can then be selected and output to a user of the hearing aid, possibly after amplification or further processing, via a loudspeaker.
  • the model situations of everyday life can be modeled on each other.
  • the determined situation can then determine, for example, the selection of the individual signals provided to the user.
  • the EP 1 326 478 A2 describes a method for controlling a signal transmission in a hearing aid. Acoustic signals that hit a receiver are evaluated. An arrival direction of such signals is determined. From signals indicating such arrival direction, a histogram is formed. Properties of this histogram are classified under different aspects and criteria. Depending on the classification, signal transmission characteristics are adjusted and controlled between the acoustic signal input and a mechanical signal output.
  • a method for processing at least a first and a second input signal in a hearing aid.
  • the first input signal is filtered to produce a first intermediate signal having at least a first coefficient
  • the first input signal is filtered to produce a second intermediate signal having at least a second coefficient
  • the second input signal is filtered to produce a third intermediate signal having at least a third coefficient and the second input signal to filter a fourth intermediate signal having at least a fourth coefficient.
  • the first and third intermediate signals are added to produce a first output signal and the second intermediate signal and the fourth intermediate signal are added to produce a second output signal.
  • the first and the second input signal are assigned to a defined signal situation and at least one of the coefficients is changed depending on the assigned defined signal situation.
  • a coefficient may be scalar or even multi-dimensional, such as. A coefficient vector or coefficient set with multiple scalar components.
  • a device for processing at least a first and a second input signal in a hearing aid, the device having a first filter for filtering the first input signal and for generating a first intermediate signal, a second filter for filtering the first Input signal and for generating a second intermediate signal, a third filter for filtering the second input signal and for generating a third intermediate signal, a fourth filter for filtering the second input signal and for generating a fourth intermediate signal, a first summation unit for adding the first intermediate signal and the third intermediate signal for generating a first output signal, a second summation unit for adding the second intermediate signal and the fourth intermediate signal for generating a second output signal, and a classification unit which stores the first input signal and assigns the second input signal to a defined signal situation and at least one of the filters is changed depending on the assigned defined signal situation.
  • the processing of the first and the second input signal can be adapted to different signal situations.
  • the first output signal and the second output signal can thus still have common components, depending on different signal situations.
  • a user of the hearing aid can therefore continue to be provided with important signal components, for example, and the user does not remain hidden from the acoustic existence of various sources.
  • the input signal can originate from one or more sources, and it is possible to selectively output corresponding components of the input signal or to output them in a selectively attenuated manner.
  • targeted acoustic signal components of certain sources can be transmitted, whereas acoustic signal components of other sources are selectively attenuated or suppressed. This is conceivable in a large number of real life situations in which a corresponding transmission or attenuation of signal components is advantageous for the user.
  • At least one of the classification quantities number of signal components, signal component levels, signal component distribution levels, power density spectrum of a signal component, input signal level, and / or spatial location of the source is one of Signal components determined.
  • the input signals can then be assigned as a function of at least one of the enumerated classification variables of a defined signal situation.
  • the defined signal situations can be predetermined, in be stored the hearing aid, or changeable or updatable.
  • the defined signal situations advantageously correspond to usual real life situations, which can be characterized and classified by the abovementioned classification variables or other suitable classification variables.
  • a maximum correlation of the first output signal and the second output signal is determined as a function of the assigned defined signal situation and at least one of the coefficients or filters is changed depending on the correlation until the correlation corresponds to the maximum correlation.
  • the separation performance or the correlation between the first output signal and the second output signal can be adapted to the actual acoustic situation in an advantageous manner. Accordingly, it may be provided to maximize the separation efficiency in a defined signal situation, i. to let the maximum correlation go to zero so as to minimize the correlation of the first output signal and the second output signal. In another acoustic situation, on the other hand, provision may be made for limiting a maximum correlation to, for example, 0.2 or 0.5.
  • the correlation of the first output signal and the second output signal may be up to 0.2 and 0.5, respectively.
  • the first output signal and the second output signal contain, to a certain extent, common signal components which, even if only one of the output signals is selected, can then be provided to the user in every case and advantageously not be hidden from the latter.
  • Fig. 1 shows a schematic representation of a first processing unit 41 according to a first embodiment of the present invention.
  • a first source 11 and a second source 12 emit acoustic signals that strike a first microphone 31 and a second microphone 32.
  • the acoustic environment for example including attenuating units or reflective walls, are modeled here by a first environmental filter 21, a second environmental filter 22, a third environmental filter 23 and a fourth environmental filter 24.
  • the first microphone 31 generates a first input signal 901 and the second microphone 32 generates a second input signal 902.
  • the first input signal 901 is provided to a first filter 411 and a second filter 412.
  • the second input signal 902 is a third filter 413 and a fourth Filter 414 provided.
  • the first filter 411 filters the first input signal 901 to produce a first intermediate signal 911.
  • the second filter 412 filters the first input signal 901 to produce a second intermediate signal 912.
  • the third filter 413 filters the second input signal 902 to produce a third intermediate signal 913
  • Filter 414 filters the second input signal 902 to generate a fourth intermediate signal 914.
  • the first intermediate signal 911 and the third intermediate signal 913 are added by a first summation unit 415 to a first output signal 921.
  • the second intermediate signal 912 and the fourth intermediate signal 914 are added by a second summation unit 416 to a second output signal 922.
  • the first output signal 921 and the second output signal 922 are provided to a correlation unit 61 which determines the correlation between the first output signal 921 and the second output signal 922.
  • the first input signal 901 and the second input signal 902 are also provided to a classification unit 51.
  • a classification unit 51 may be provided to also provide the first output signal 921 and / or the second output signal 922 to the classification unit 51.
  • the classification unit 51 can also have a memory unit 52 in which defined signal situations are stored.
  • the classification unit 51 assigns the input signals 901, 902 and optionally the output signals 921, 922 to a defined signal situation.
  • the classification unit 51 can determine at least one of the classification quantities number of signal components, level of a signal component, distribution of the levels of the signal components, power density spectrum of a signal component and / or level of a signal component, and the assignment to a defined signal situation can be made as a function of at least one of the classification values.
  • a signal component may be one of several components of an input signal 901, 902, each derived individually from a source or group of sources.
  • signal components may be separated when there are input signals with acoustic signal components from a source of at least two microphones. In this case, these signal components can have a corresponding time delay or other differences, which can also be used to determine a spatial position.
  • the input signals 901, 902 then have two equivalent sound components which are offset by a certain period of time. This particular period of time is given by the fact that the sound of a source 11, 12 generally reaches the first microphone 31 and the second microphone 32 at different times. For example, achieved at the in Fig. 1 shown arrangement of the sound of the first source 11, the first microphone 31 in front of the second microphone 32.
  • the spatial distance between the first microphone 31 and the second microphone 32 also influences the specific period of time. In modern hearing aids, this distance of the two microphones 31, 32 can be reduced to only a few millimeters, whereby a reliable separation is still possible.
  • a determined classification variable does not necessarily have to be identical to a classification variable of the defined signal situations, but the classification unit 51 can assign, for example by providing bandwidths and tolerances in the classification variables, a similar one of the defined signal situations.
  • a scheme for controlling the filters or the corresponding coefficients is also stored in a defined signal situation. If the classification unit 51 has therefore assigned the actual acoustic situation to the sources of a defined signal situation, the correlation unit 61 is instructed accordingly via a control signal, the correlation between the first output signal 921 and the second Output signal 922 to minimize or limit to a certain limit.
  • signal situation classification variables level change Conversation in peace • few signal components • low separation efficiency • few strong signal components • Allow correlation to 1 • few weak signal components • high signal-to-noise ratio Conversation in the car • many signal components (reflections) • average separation efficiency • Components with characteristic performance spectrum (engine) • Allow correlation to 0.2 or 0.5 Cocktail Party • many signal components • high separation efficiency • high levels • Minimize correlation
  • Strong signal components can be distinguished from weak signal components, for example, based on their respective levels.
  • the level of a signal component is here as the average amplitude level of the corresponding acoustic Understanding a signal, wherein a high average amplitude level corresponds to a high level and a low average amplitude level corresponds to a low level.
  • a strong component can have at least twice as high averaged amplitude level as a weak component.
  • provision can also be made for assigning an amplitude height, which is increased by 10 dB, to a strong component in comparison with an amplitude height of a weak component.
  • the level of a component is amplified or attenuated by amplifying or attenuating the corresponding component so that the averaged amplitude level is increased or decreased.
  • Significant amplification or attenuation of a level can be achieved, for example, by increasing or decreasing the corresponding mean amplitude level by at least 5 dB.
  • the correlation of the output signals is a measure of common signal components of the output signals.
  • a maximum correlation assigned a value of 1 means that both output signals are maximally correlated and equal.
  • a minimum correlation, which is assigned a value 0, means that both output signals are minimally correlated and thus unequal or have no common signal components.
  • the first output signal 921 and the second output signal 922 have a correlation which is regulated or adapted to the actual acoustic situation.
  • it may be provided to minimize the correlation, ie to maximize the separation power, or to limit the separation power, ie to increase the correlation to a given maximum value.
  • the first output signal 921 may advantageously have signal components of the second output signal 922 in a certain well-defined limited measure. If, for example, only the first output signal 921 is provided to the user of a hearing aid, then the user does not remain hidden from the acoustic existence of the sources of the corresponding signal components.
  • a hearing aid can also perceive important sources, although these are not an integral part of the actual acoustic current situation.
  • sources include, but are not limited to, extraneous sources, such as an overtaking car driving a car, or a sudden response from a third party during a conversation with an opposite party.
  • Fig. 2 shows a second processing unit 42 according to a second embodiment of the present invention.
  • the second processing unit 42 comprises analogously to the first processing unit 41, which in connection with Fig. 1 Filter 411, 412, 413 and 414, summation units 415 and 416, a classification unit 51 with a memory unit 52, and a correlation unit 61.
  • the filters 411 to 414 and the classification unit 51 are again the first input signal 901 from the first microphone 31 and the second input signal 902 provided by the second microphone 32.
  • it may again be provided to provide the classification unit 51 with the first output signal 921 and / or the second output signal 922.
  • the correlation unit 61 controls the filters 411 to 414 as a function of an acoustically defined signal situation assigned by the classification unit 51.
  • the first output signal 921 and the second output signal 922 are provided to a mixing unit 71.
  • the mixing unit 71 has a first amplifier 711 for variably amplifying or attenuating the first output signal 921 and a second amplifier for amplifying or also variably attenuating the second output signal 922.
  • the attenuated output signals 921, 922 are provided to a summation unit 713 for generating an output signal 930.
  • the first output signal 921 and the second output signal 922 are superimposed again after the separation and are thus jointly provided to a user.
  • Fig. 3 shows a hearing aid 1 according to a third embodiment of the present invention.
  • the hearing aid 1 has the first microphone 31 for generating the first input signal 901 and the second microphone 32 for generating the second input signal 902.
  • the first input signal 901 and the second input signal 902 are provided to a processing unit 140.
  • the processing unit 140 may, for example, correspond to the first processing unit 41 or the second processing unit 42, which may be used in conjunction with the first processing unit 41 FIGS. 1 and 2 are described.
  • the output signal 930 is provided to an output unit 180 for generating a speaker signal 931.
  • the speaker signal 931 is provided to the user via a speaker 190.
  • the processing unit 140 By integrating the processing unit 140 into the hearing aid 1, the acoustic signals originating from different sources and picked up by the microphones 31, 32 can be provided to the user with a variable and situation-dependent separation performance.
  • the processing unit 140 allocates the actual acoustic situation that it receives via the microphones 31, 32 to a defined signal situation, and accordingly regulates the separation performance and / or selects one of the output signals.
  • the output signal 930 comprises all signal components important for the corresponding acoustic signal situation in a correspondingly amplified form, while other signal components are suppressed or, according to the signal situation, in any case provided at least still attenuated.
  • the hearing aid 1 may represent a hearing aid worn behind the ear (BTE - Behind The Ear), a hearing aid worn in the ear canal (ITC - In The Ear, CIC - Completely In the Canal) or a hearing aid in an external central housing with a connection to a loudspeaker in acoustical proximity to the ear.
  • Fig. 4 shows a schematic representation of a left hearing aid 2 and a right hearing aid 3 according to a fourth embodiment of the present invention.
  • the left hearing aid 2 in this case has at least the first microphone 31, a left processing unit 240, a left output unit 280, a left speaker 290 and a left communication unit 241.
  • the left input signal 942 generated by the first microphone 31 is provided to the left processing unit 240.
  • the left processing unit 240 outputs a left output signal 952 in response to an associated defined signal situation.
  • the output unit 280 generates a left speaker signal 962, which is output acoustically via the left speaker 290.
  • the left processing unit 240 can communicate with another hearing aid via the left communication unit 241 and via a communication signal 932.
  • the right-hand hearing device 3 has at least the second microphone 32, a right-hand processing unit 340, a right-hand output unit 380, a right-hand speaker 390 and a right-hand communication unit 341.
  • the right input signal 943 generated by the second microphone 32 is provided to the right processing unit 340.
  • the right processing unit 340 outputs a first right output signal 953 in response to an associated defined signal situation.
  • the output unit 380 generates a right speaker signal 963, which is acoustically output via the right speaker 390.
  • the right processing unit 340 can communicate with another hearing aid via the right communication unit 341 and via the communication signal 932.
  • communication between the left hearing aid 2 and the right hearing aid 3 is via a communication signal 932 provided.
  • the communication signal 932 can be transmitted via a cable connection or also via a wireless radio link between the left hearing device 2 and the right hearing device 3.
  • the left input signal 942 generated by the first microphone 31 may also be provided to the right processing unit 340 via the left communication unit 241, the communication signal 932, and the right communication unit 341.
  • the right input signal 943 generated by the second microphone 32 may also be provided to the left processing unit 240 via the right communication unit 341, the communication signal 932, and the left communication unit 241.
  • both the left processing unit 240 and the right processing unit 340 are able to perform source separation and reliable classification, although the left and right hearing aids 2, 3 may have only one of the microphones 31, 32, respectively.
  • the distance between the first microphone 31 and the second microphone 32 which is greater than a common arrangement of a plurality of microphones in a hearing device, can be favorable and advantageous for source separation and / or classification.
  • bidirectional path right communication unit 341, communication signal 932, and left communication unit 241 may further include communication between left processing unit 240 and right processing unit 340 for common classification.
  • the left hearing device 2 and / or the right hearing device 3 two or more microphones exhibit.
  • a reliable function is ensured even in the event of a failure or disruption of one of the hearing devices 2, 3 or the communication signal 932, ie the source separation and assignment of the acoustic situation is still possible for the individual hearing device still functioning ,
  • the user can intervene in the classification as well as in the spatial selection of the individual signals via operating elements which may be arranged on one of the hearing devices 3, 4 or else via a remote control.
  • the defined signal situations can thus be advantageously adapted, for example during a learning phase, to the needs and the acoustic situations in which the user actually goes.
  • the Fig. 5 shows a cross-correlation r 12 ( 1 ) according to a fifth embodiment of the present invention.
  • the cross-correlation r 12 ( l ) is a measure of the correlation.
  • E ( X ) is the expectation of the variable X
  • k is a discretized time over which the expected value E ( X ) is determined
  • l represents a discretized time delay between y 1 ( k ) and y 2 ( k + l ).
  • a source separation it may be provided to modify at least one filter or a corresponding coefficient until the cross-correlation r 12 ( 1 ) according to (1) is minimized for every 1 of an interval.
  • a value of 0.1 can be assumed, since a minimization of r 12 ( l ) to 0 is not always possible, and especially often is not necessary.
  • a high cross correlation r 12 ( l ) with a value of 1 corresponds to a low separation power, whereas a vanishing cross correlation r 12 ( l ) to 0 corresponds to a maximum separation power.
  • a variable threshold 501 is provided for the cross-correlation r 12 ( l ).
  • the threshold value can be changed as a function of a defined signal situation and, for example, assume a value of 0.2 or 0.5.
  • the source separation by adaptation of the filters or the coefficients is then terminated, for example, if the cross-correlation r 12 ( I ) is below the threshold value 501 for all 1 of an interval. This ensures in an advantageous manner that the two amplitude functions y 1 ( l ) and y 2 ( l ), or the corresponding signals, still have a minimum of correlation, depending on the situation.
  • Fig. 6 shows a discrete Fourier transform R 12 ( ⁇ ) according to a sixth embodiment of the present invention.
  • the Fourier transform R 12 ( ⁇ ) is determined for a frequency range and at least one filter or a corresponding coefficient is changed until the Fourier transform R 12 ( ⁇ ) for a frequency range is minimized.
  • a variable threshold 601 is provided for the Fourier transform R 12 ( ⁇ ).
  • the threshold value can be changed depending on a defined signal situation.
  • the source separation by adaptation of the filters or the coefficients is then terminated, for example, when the Fourier transform R 12 ( ⁇ ) lies in a frequency range below the threshold value 601. This ensures in an advantageous manner that the two amplitude functions y 1 (l) and y 2 ( l ) , or the corresponding signals, still have a minimum of correlation, depending on the situation.
  • the first coefficient, the second coefficient, the third coefficient, and / or the fourth coefficient may be multi-dimensional.
  • the coefficients may be scalar or multi-dimensional, such as.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)
EP07117164.9A 2006-10-10 2007-09-25 Verarbeitung eines Eingangssignals in einer Hörhilfe Not-in-force EP1912471B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006047986A DE102006047986B4 (de) 2006-10-10 2006-10-10 Verarbeitung eines Eingangssignals in einem Hörgerät

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EP1912471A2 EP1912471A2 (de) 2008-04-16
EP1912471A3 EP1912471A3 (de) 2011-05-11
EP1912471B1 true EP1912471B1 (de) 2016-03-09

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US (1) US8199949B2 (zh)
EP (1) EP1912471B1 (zh)
CN (1) CN101287305B (zh)
DE (1) DE102006047986B4 (zh)
DK (1) DK1912471T3 (zh)

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WO2009087968A1 (ja) * 2008-01-10 2009-07-16 Panasonic Corporation 補聴処理装置、調整装置、補聴処理システム、補聴処理方法、プログラム、及び集積回路
US8705751B2 (en) 2008-06-02 2014-04-22 Starkey Laboratories, Inc. Compression and mixing for hearing assistance devices
US9485589B2 (en) 2008-06-02 2016-11-01 Starkey Laboratories, Inc. Enhanced dynamics processing of streaming audio by source separation and remixing
US9185500B2 (en) 2008-06-02 2015-11-10 Starkey Laboratories, Inc. Compression of spaced sources for hearing assistance devices
KR101613684B1 (ko) * 2009-12-09 2016-04-19 삼성전자주식회사 음향 신호 보강 처리 장치 및 방법
CN104244153A (zh) * 2013-06-20 2014-12-24 上海耐普微电子有限公司 超低噪音高振幅音频捕获的数字麦克风
GB201615538D0 (en) * 2016-09-13 2016-10-26 Nokia Technologies Oy A method , apparatus and computer program for processing audio signals
DK3588979T3 (da) * 2018-06-22 2020-12-14 Sivantos Pte Ltd Fremgangsmåde til forstærkning af en signalretning i et høreapparat
DE102020210805B3 (de) 2020-08-26 2022-02-10 Sivantos Pte. Ltd. Verfahren zur direktionalen Signalverarbeitung für ein akustisches System

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DE102006047986B4 (de) 2012-06-14
US20080130925A1 (en) 2008-06-05
US8199949B2 (en) 2012-06-12
CN101287305A (zh) 2008-10-15
DE102006047986A1 (de) 2008-04-24
DK1912471T3 (da) 2016-06-27
EP1912471A3 (de) 2011-05-11
EP1912471A2 (de) 2008-04-16
CN101287305B (zh) 2013-02-27

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