EP2124482B1 - Dispositif auditif avec filtre égaliseur dans un système de banc de filtres - Google Patents

Dispositif auditif avec filtre égaliseur dans un système de banc de filtres Download PDF

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Publication number
EP2124482B1
EP2124482B1 EP09159399.6A EP09159399A EP2124482B1 EP 2124482 B1 EP2124482 B1 EP 2124482B1 EP 09159399 A EP09159399 A EP 09159399A EP 2124482 B1 EP2124482 B1 EP 2124482B1
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EP
European Patent Office
Prior art keywords
filter bank
filter
equalization
channels
sfb
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EP09159399.6A
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German (de)
English (en)
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EP2124482A3 (fr
EP2124482A2 (fr
Inventor
Daniel Alfsmann
Robert BÄUML
Dr. Henning Puder
Wolfgang Sörgel
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Sivantos Pte Ltd
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Sivantos Pte Ltd
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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
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/03—Synergistic effects of band splitting and sub-band processing
    • 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

Definitions

  • the present invention relates to a hearing aid with a filter bank system which has a multi-stage analysis filter bank and / or a multi-stage synthesis filter bank to split an input signal of the hearing device through a plurality of filter bank channels into a plurality of subband signals and / or to re-assemble subband signals of a plurality of filter bank channels.
  • the term "hearing device” is understood to mean any sound-emitting device which can be worn in or on the ear, in particular a hearing device, a headset, headphones and the like.
  • Hearing aids are portable hearing aids that are used to care for the hearing impaired.
  • different types of hearing aids such as behind-the-ear hearing aids (BTE), hearing aid with external receiver (RIC: receiver in the canal) and in-the-ear hearing aids (IDO), e.g. Concha hearing aids or canal hearing aids (ITE, CIC).
  • BTE behind-the-ear hearing aids
  • RIC hearing aid with external receiver
  • IDO in-the-ear hearing aids
  • ITE canal hearing aids
  • the hearing aids listed by way of example are worn on the outer ear or in the ear canal.
  • bone conduction hearing aids, implantable or vibrotactile hearing aids are also available on the market. The stimulation of the damaged hearing takes place either mechanically or electrically.
  • Hearing aids have in principle as essential components an input transducer, an amplifier and an output transducer.
  • the input transducer is usually a sound receiver, z. As a microphone, and / or an electromagnetic receiver, for. B. an induction coil.
  • the output transducer is usually used as an electroacoustic transducer, z. As miniature speaker, or as an electromechanical transducer, z. B. bone conduction, realized.
  • the amplifier is usually integrated in a signal processing unit. This basic structure is in FIG. 1 shown using the example of a behind-the-ear hearing aid. In a hearing aid housing 1 for carrying behind the ear, one or more microphones 2 for receiving the sound from the environment are installed.
  • a signal processing unit 3 which is also integrated in the hearing aid housing 1, processes the microphone signals and amplifies them.
  • the output signal of the signal processing unit 3 is transmitted to a loudspeaker or earpiece 4, which outputs an acoustic signal.
  • the sound is optionally transmitted via a sound tube, which is fixed with an earmold in the ear canal, to the eardrum of the device carrier.
  • the power supply of the hearing device and in particular the signal processing unit 3 is effected by a likewise integrated into the hearing aid housing 1 battery. 5
  • Sound signals recorded with one or more microphones of a hearing device and in particular of a hearing device are frequently split into K subband signals by means of one or more frequency-selective digital analysis filter banks (AFB).
  • the subband signals are then subjected to a subband-specific signal manipulation.
  • the manipulated subband signals are resynthesized by means of a digital synthesis filter bank (SFB).
  • the decomposition and resynthesis are performed by a filter bank composed of at least two cascaded stages or a partially at least two-stage (analysis) filter bank for decomposing the input signal into K subband signals with a reduced sampling rate.
  • the entire filter bank system thus consists of a multi-level AFB and a multi-level SFB.
  • the individual filter banks can each be conventional complex-modulated filter banks.
  • the filter bank outlined above for generating subband signals of different bandwidths B i effects a delay (group delay) of the K subband signals, which depends on the respective signal or channel bandwidth B i . This results in between the subband signals or subband signal groups of different bandwidths B i jumps in the total signal delay, which have a disturbing effect on the signal quality.
  • a hearing device is made US 2005/0185798 A1 known.
  • the hearing apparatus comprises a filter bank system having an analysis filter bank which decomposes an input signal through a plurality of filter bank channels into a plurality of subband signals, and a synthesis filter bank which reassembles the subband signals of the filter bank channels.
  • the hearing device further comprises a correction unit which is interposed between the filter banks and which frequency-dependently delays the subband signals in order to correct group delay times as a function of a deviation in the hearing of a hearing impaired person.
  • US 5 233 665 A is an audio equalizer system known.
  • the equalizer system has a high-pass filter followed by an N-band filter, the channels of which are then amplified separately. The individual resulting frequency bands are combined via a summer and output.
  • a low-noise noise reduction filter is known.
  • An analysis filter bank breaks an input signal into two output channels.
  • the first channel signal is an estimate of a periodic component of the input signal
  • the second channel signal is an estimate of a non-periodic component of the input signal.
  • the signal undergoes a delay while the signal in the second channel passes through a noise reduction filter.
  • a method is known with which a serial input signal can be transmitted via a data transmission connection.
  • the method comprises the decomposition of the input signal into a plurality of filter bank channels by means of a multi-stage analysis filter bank and the combining of the subband signals guided in the filter bank channels by means of a multi-stage synthesis filter bank.
  • the object of the present invention is therefore to improve the signal quality in the processing of signals in hearing devices using multi-stage filter banks.
  • this object is achieved by a hearing device with a filter bank system which has a multi-stage analysis filter bank and a multi-stage synthesis filter bank to split an input signal of the hearing device through several filter bank channels into a plurality of subband signals and / or to re-assemble subband signals of several filter bank channels where the filter bank system is equipped with at least one equalization filter to compensate for differences in frequency responses between filter bank channels.
  • equalization filter equalizer
  • both the analysis filter bank and the synthesis filter bank are multi-level, and the equalization filter is arranged between two hierarchical levels of filters of the filter bank system.
  • the equalization filter may be located at the bottom of the analysis filterbank or the synthesis filterbank. This only requires one or more equalizers that operate at the lowest sampling rate and thus require less processing power.
  • the equalization filter may be located in the topmost stage of the synthesis filterbank.
  • the advantage of this is that the group delay / magnitude frequency response transition over the maximum frequency width, namely the entire signal bandwidth can be distributed.
  • the equalization filter is placed in the synthesis filterbank. It can also be used to equalize distortions that originate from the analysis filter bank.
  • At least two pairs of adjacent filter banks are present, which have different bandwidth in relation to each other, so that in each filter bank pair two filter bank channels of different width are adjacent to each other, and in the wider of the two filter bank channels is ever a equalization to Group runtime increase arranged. This makes it possible to easily achieve a steady transition of the group delay at the subband boundaries.
  • FIG. 2 is a filter bank cascade consisting of a multi-stage analysis filter bank (AFB) and a multi-stage synthesis filter bank (SFB) shown.
  • the exemplary filter bank is used for signal processing in a hearing device and in particular in a hearing aid.
  • the input side filter bank (FB1) the AFB splits the input signal into four channels.
  • the output-side filter banks FB2A, FB2B, FB2C and FB2D further divide the four channels into ultimately 24 channels.
  • the lowest channel of the FB1 is split by the FB2A into twelve channels, while the remaining three channels of the FB1 are divided into four channels using the output-side filter banks FB2B, FB2C and FB2D.
  • the input sampling rate of the FB1 is 4 kHz, for example.
  • the sampling rate between the two filter bank stages f Zw is 6 kHz in the example chosen.
  • the sampling rates in the subband channels at the output of the AFB are in the high frequency groups that is after the filter banks FB2B, FB2C and FB2D each 3kHz.
  • the sampling rate after the filter bank FB2A of the lower frequency group is 1.2 kHz. In this case, a downward scanning is advantageously carried out here.
  • a subband specific signal manipulation is performed, which in FIG. 2 but not shown.
  • the AFB in FIG. 2 directly the SFB for the resynthesis of the signal.
  • the SFB is constructed symmetrically to the AFB with regard to the filter banks in the individual stages. Accordingly, the filter banks FB3A, FB3B, FB3C and FB3D are located in the lowest stage of the SFB, which combine twelve or four subband signals into one signal.
  • the four resulting signals at a sampling rate of 6 kHz are fed to the higher synthesis stage FB4, which composes the signals into an output signal with a sampling rate of 24 kHz.
  • the wider filter banks FB2A and FB3A in the lower frequency group also lead here to an increased group delay ⁇ g compared to the next higher frequency group with the narrower filter banks FB2B and FB3B.
  • the effects of the filter banks FB3A, FB3B and FB3C of the synthesis filter bank are shown there.
  • a group delay jump which is indicated by dashed lines.
  • One however, such a jump would lead to disturbances in the output signal.
  • the filter bank FB3B is therefore followed by an equalization filter (equalizer EQ).
  • This equalization filter EQ increases the group delay of the filter bank FB3B at the upper (higher frequency) band edge to the value of the group delay of the filter bank FB3A at its lower band edge.
  • the results in FIG. 3 Solid, continuous curve between the two filter banks FB3A and FB3B. Disturbances in the output signal due to group delay differences of the filter banks can thus largely be avoided.
  • the equalization filter EQ can also be arranged at other locations in the AFB-SFB system. As a result, for example, the dotted transition of the group delay from the value of the filter bank FB3A to the value of the filter bank FB3C would be FIG. 3 possible (see below for details).
  • an AFB SFB system is generally provided with at least one equalizer (EQ) to reduce group delay differences and / or attenuation / gain differences between different bandwidth filter bank channels B i .
  • the equalization function should always refer to the case where the subband signals of the AFB-SFB filter bank are not subject to manipulation, ie a so-called "idle state" exists.
  • the aim of the equalization method is not to extend the absolute equalization of the properties of the filter bank channels of different bandwidths, but to extend the abrupt transitions of the transmission characteristics limited to a very narrow band of frequencies to a wider frequency band in order to avoid disturbing artifacts.
  • the equalization filter is used to increase group delays in certain subbands or to modify attenuations / amplifications in the desired manner.
  • this could also be based on the example of FIG. 3 the group delay of the filter bank FB3B at the upper band edge of the value of the group delay of the Filter bank FB3C be increased to the value of the group delay of the filter bank FB3A at the lower band edge.
  • an equalization filter could be provided at the lowest level of the subbands in the wider (3kHz) channel with the lowest center frequency.
  • the transition region is extended only over one channel (the 3 kHz bandwidth), while it may extend over 3 x 3 kHz when the equalization filter is arranged at a higher level.
  • one equalizing filter must be used in each of four adjacent 3 kHz channels. The advantage of using only one or two equalization filters at this lowest level is that they can work at the lowest sampling rate and thus generally require less computing power.
  • the equalization filter EQ in the highest level of the cascaded filter bank system is arranged here at the output of the filter bank FB4.
  • the group delay or magnitude frequency response transition can be distributed over the maximum frequency width, ie the entire signal bandwidth (see dotted line in FIG. 3 )
  • the filter bank system has more than two different bandwidths.
  • an equalization filter EQ is provided at each Transition between adjacent channels of different bandwidth.
  • the equalization filter is to be arranged in each case in the channel with the larger bandwidth, since there it must increase the group delay.
  • the amplifying or attenuating equalizing filter EQ may also be arranged in the other channel.
  • equalizers or equalization filters EQ in individual filter bank channels at a different hierarchical level avoids abrupt transitions of the attenuation / amplification and / or the group delay.
  • Particular advantages arise when the smallest possible number of equalization filters EQ is used, in which they are placed at those points where they are most effective. But they can also be located where they cause the least amount of computation.

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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)
  • Networks Using Active Elements (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Claims (7)

  1. Dispositif auditif avec un système à batterie de filtres qui présente une batterie de filtres d'analyse (AFB) et une batterie de filtres de synthèse (SFB) pour décomposer en plusieurs signaux de sous-bande un signal d'entrée du dispositif auditif à travers plusieurs canaux de batterie de filtres ou respectivement pour réassembler des signaux de sous-bande de plusieurs canaux de batterie de filtres, le système à batterie de filtres étant équipé d'au moins un filtre d'égalisation (EQ) pour compenser des différences des réponses en fréquence complexes entre canaux de batterie de filtres,
    caractérisé en ce que la batterie de filtres d'analyse (AFB) et la batterie de filtres de synthèse (SFB) sont constituées à plusieurs étages, et en ce qu'au moins un filtre d'égalisation (EQ) est disposé dans la batterie de filtres d'analyse (AFB) ou dans la batterie de filtres de synthèse (SFB).
  2. Dispositif auditif selon la revendication 1, des différences de temps de propagation de groupe pouvant être compensées avec le filtre d'égalisation (EQ) au moins au nombre de un.
  3. Dispositif auditif selon la revendication 1 ou 2, des différences d'atténuation ou d'amplification entre les canaux de batterie de filtres pouvant être compensées avec le filtre d'égalisation (EQ) au moins au nombre de un.
  4. Dispositif auditif selon l'une des revendications précédentes, le filtre d'égalisation (EQ) au moins au nombre de un étant disposé entre deux niveaux hiérarchiques de filtres du système à batterie de filtres.
  5. Dispositif auditif selon l'une des revendications précédentes, le filtre d'égalisation (EQ) au moins au nombre de un étant disposé dans le niveau le plus bas de la batterie de filtres d'analyse (AFB) ou de la batterie de filtres de synthèse (SFB).
  6. Dispositif auditif selon l'une des revendications 1 à 4, le filtre d'égalisation (EQ) au moins au nombre de un étant disposé dans le niveau le plus haut de la batterie de filtres de synthèse (SFB).
  7. Dispositif auditif selon l'une des revendications 1 à 6, au moins deux paires de batteries de filtres juxtaposées étant présentes dans le système à batterie de filtres, les batteries de filtres respectivement juxtaposées possédant en l'occurrence, l'une par rapport à l'autre, des canaux de largeur de bande différente de telle sorte que, pour chaque paire de batteries de filtres, respectivement deux canaux de batterie de filtres de différente largeur sont juxtaposés et, dans le plus large des respectivement deux canaux de batterie de filtres, il est disposé respectivement un filtre d'égalisation (EQ) pour l'augmentation du temps de propagation de groupe.
EP09159399.6A 2008-05-21 2009-05-05 Dispositif auditif avec filtre égaliseur dans un système de banc de filtres Active EP2124482B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008024534A DE102008024534A1 (de) 2008-05-21 2008-05-21 Hörvorrichtung mit einem Entzerrungsfilter im Filterbank-System

Publications (3)

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EP2124482A2 EP2124482A2 (fr) 2009-11-25
EP2124482A3 EP2124482A3 (fr) 2014-06-25
EP2124482B1 true EP2124482B1 (fr) 2017-12-06

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EP09159399.6A Active EP2124482B1 (fr) 2008-05-21 2009-05-05 Dispositif auditif avec filtre égaliseur dans un système de banc de filtres

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US (1) US8908893B2 (fr)
EP (1) EP2124482B1 (fr)
DE (1) DE102008024534A1 (fr)
DK (1) DK2124482T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8958510B1 (en) * 2010-06-10 2015-02-17 Fredric J. Harris Selectable bandwidth filter
DE102010026884B4 (de) 2010-07-12 2013-11-07 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betreiben einer Hörvorrichtung mit zweistufiger Transformation
DE102010039589A1 (de) 2010-08-20 2012-02-23 Siemens Medical Instruments Pte. Ltd. Hörhilfe- und/oder Tinnitus-Therapie-Gerät
EP2605549B1 (fr) * 2011-12-16 2019-11-13 Harman Becker Automotive Systems GmbH Filtres d'égalisation numériques avec réponse de phase fixe
DE102021205251A1 (de) * 2021-05-21 2022-11-24 Sivantos Pte. Ltd. Verfahren und Vorrichtung zur frequenzselektiven Verarbeitung eines Audiosignals mit geringer Latenz

Citations (1)

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Publication number Priority date Publication date Assignee Title
US5995539A (en) * 1993-03-17 1999-11-30 Miller; William J. Method and apparatus for signal transmission and reception

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US5016280A (en) * 1988-03-23 1991-05-14 Central Institute For The Deaf Electronic filters, hearing aids and methods
ATE132648T1 (de) * 1991-02-04 1996-01-15 Dolby Lab Licensing Corp Speichermedium und vorrichtung zur rückgewinnung von data des mediums durch uberabtastung
US5233665A (en) * 1991-12-17 1993-08-03 Gary L. Vaughn Phonetic equalizer system
EP0758817B1 (fr) * 1995-08-12 2001-07-25 Micronas GmbH Egaliseur pour signaux numériques
US5742694A (en) * 1996-07-12 1998-04-21 Eatwell; Graham P. Noise reduction filter
JP4035867B2 (ja) * 1997-09-11 2008-01-23 株式会社セガ 画像処理装置及び画像処理方法並びに媒体
US7003120B1 (en) * 1998-10-29 2006-02-21 Paul Reed Smith Guitars, Inc. Method of modifying harmonic content of a complex waveform
US6996198B2 (en) * 2000-10-27 2006-02-07 At&T Corp. Nonuniform oversampled filter banks for audio signal processing
CA2357200C (fr) * 2001-09-07 2010-05-04 Dspfactory Ltd. Dispositif d'ecoute
JP4402977B2 (ja) * 2003-02-14 2010-01-20 ジーエヌ リザウンド エー／エス 補聴器における動的圧縮
US7428313B2 (en) * 2004-02-20 2008-09-23 Syracuse University Method for correcting sound for the hearing-impaired

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5995539A (en) * 1993-03-17 1999-11-30 Miller; William J. Method and apparatus for signal transmission and reception

Also Published As

Publication number Publication date
DE102008024534A1 (de) 2009-12-03
EP2124482A3 (fr) 2014-06-25
EP2124482A2 (fr) 2009-11-25
US20090290734A1 (en) 2009-11-26
DK2124482T3 (da) 2018-03-05
US8908893B2 (en) 2014-12-09

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