EP2506254A1 - Procédé d'amélioration de l'intelligibilité de la parole avec un appareil auditif ainsi qu'appareil auditif - Google Patents

Procédé d'amélioration de l'intelligibilité de la parole avec un appareil auditif ainsi qu'appareil auditif Download PDF

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Publication number
EP2506254A1
EP2506254A1 EP12158846A EP12158846A EP2506254A1 EP 2506254 A1 EP2506254 A1 EP 2506254A1 EP 12158846 A EP12158846 A EP 12158846A EP 12158846 A EP12158846 A EP 12158846A EP 2506254 A1 EP2506254 A1 EP 2506254A1
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EP
European Patent Office
Prior art keywords
signal
frequency
input signal
hearing aid
electrical input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12158846A
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German (de)
English (en)
Inventor
Sebastian Pape
Maja Serman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sivantos Pte Ltd
Original Assignee
Siemens Medical Instruments Pte Ltd
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Application filed by Siemens Medical Instruments Pte Ltd filed Critical Siemens Medical Instruments Pte Ltd
Publication of EP2506254A1 publication Critical patent/EP2506254A1/fr
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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
    • H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • H04R25/353—Frequency, e.g. frequency shift or compression
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
    • G10L21/0364—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude for improving intelligibility
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/06—Transformation of speech into a non-audible representation, e.g. speech visualisation or speech processing for tactile aids
    • G10L2021/065—Aids for the handicapped in understanding
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0264—Noise filtering characterised by the type of parameter measurement, e.g. correlation techniques, zero crossing techniques or predictive techniques
    • 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
    • H04R2225/43—Signal processing in hearing aids to enhance the speech intelligibility

Definitions

  • the invention relates to a hearing aid and a method for operating a hearing aid with an input transducer for receiving an input signal and conversion to an electrical input signal, a signal processing unit for processing and frequency-dependent amplification of the electrical input signal and for generating an electrical output signal and an output transducer for converting the electrical output signal in a user perceived as an acoustic output signal output signal.
  • the maximum achievable with a hearing aid gain are usually limited by the required, small size of the devices and the small distance between the input transducer (especially microphone) and output transducer (especially listener). If the gain is too high, especially the extremely annoying feedback whistling occurs.
  • the feedback tendency of a hearing aid is frequency-dependent and usually affects the upper range of the transferable from a hearing aid frequency range.
  • a method for frequency transposition in a hearing aid and a hearing aid for performing a frequency transposition are from the document EP 1 441 562 A2 known.
  • the frequency transposition in particular the frequency shift, has two major disadvantages: on the one hand spectrally the destruction of the original spectral composition of certain consonants and other sounds and on the other - regarding the perception - the ability to differentiate different Frikative, significantly deteriorated.
  • a hearing aid in which a frequency analysis device classifies sounds and defines a transposition factor for a frequency transposition according to the frequencies occurring in the sounds.
  • a device for the reconstruction of speech components is provided in the hearing aid. For this purpose, each of their beginnings are stored for individual, recognized speech sounds, and the remaining remainder are discarded. By temporally stretched outputting of these voice beginnings then the actual frequency transposition is achieved.
  • Object of the present invention is to improve the understanding of speech in hearing loss, in which certain frequency ranges can not be perceived even at high volume.
  • a hearing aid device is understood to mean any device which provides or helps to provide an output signal perceptible by a user as an audible signal, and which has means which help or compensate for an individual hearing loss of the user.
  • this is a hearing aid that can be worn on the body or on the head, in particular on or in the ear, as well as being fully or partially implantable.
  • such devices are also included, whose primary purpose is not to compensate for hearing loss, such as consumer electronics (TVs, hi-fi systems, MP3 players, etc.), or communication devices (mobile phones, PDAs, headsets etc), which however have means to compensate for individual hearing loss.
  • a hearing aid generally includes an input transducer for receiving an input signal.
  • the input transducer is designed, for example, as a microphone which picks up an acoustic signal and converts it into an electrical input signal.
  • input transducers are also units into consideration, which have a coil or an antenna and receive an electromagnetic signal and convert it into an electrical input signal.
  • a hearing aid usually includes a signal processing unit for processing and frequency-dependent amplification of the electrical input signal.
  • a preferably digital signal processor (DSP) is used, whose operation can be influenced by means of programs or parameters which can be transmitted to the hearing aid.
  • the mode of operation of the signal processing unit can be adapted both to the individual hearing loss of a hearing aid wearer and to the current hearing situation in which the hearing aid is currently being operated.
  • the thus changed electrical input signal is finally fed to an output transducer.
  • This is usually designed as a handset, which converts the electrical output signal into an acoustic signal.
  • other embodiments are also possible here, e.g. an implantable output transducer that connects directly to an auditory ossicle and causes it to vibrate.
  • the basic idea of the invention is to detect specific features of the electrical input signal and to filter the transposed signal as a function of the detected specific features of the input signal.
  • the hearing aid according to the invention has corresponding means for detecting specific features of the electrical input signal and filter means for filtering the transposed signal.
  • the goal here is to provide certain characteristics of the input signal, possibly through the Frequency transposition lost to capture and at least partially restore in the transposed signal.
  • particular characteristic features of a speech signal comprised by the input signal are detected as specific features of the electrical input signal. These are in particular characteristic features of certain parts of speech, such as characteristic features of certain sounds, consonants or fricatives. In addition, however, specific features of other signals encompassed by the input signal, for example music, can also be detected and filtering can be carried out as a function of these features. More generally, the object of the invention is to provide specific, i. certain or characteristic, features of the input signal, which are lost by the frequency transposition, subsequently retrieve by filter medium least partially recovered.
  • an energy distribution of the electrical input signal over the frequency is detected. This can for example be based on a spectral analysis of the input signal, in which for a certain frequency range to each frequency of the input signal, the signal level is determined. The aim of the subsequent filtering of the transposed signal is then to achieve a similar energy distribution in the output signal, where the corresponding energy maxima and minima are there at changed frequencies according to a frequency transposition rule.
  • Another embodiment of the invention provides to detect as specific features of the electrical input signal whose maxima and / or minima in dependence on the frequency. Again, then by an appropriate attitude the filter means the number and location of the maxima and minima mapped to the transposed frequency range.
  • a hearing aid with filter means for dividing the electrical input signal into a plurality of frequency bands (channels), wherein the processing and frequency-dependent amplification of the electrical input signal is at least partially parallel in the individual frequency bands, and with means for transmitting at least one in a first frequency band present signal in a second frequency band in the frequency transposition.
  • this channel-dependent or channel-wise frequency shift which in practice represents the method preferably used in comparison with frequency compression, the distribution of these variables in the output signal can vary greatly from the original energy distribution or distribution of the maxima and minima.
  • the specific features of the electrical input signal recorded according to the invention are then characteristic features of these sounds, in particular a characteristic form of the frequency spectrum, the energy distribution, etc.
  • a sound is generally a sound or sound produced by the human or animal voice.
  • a sound in the narrower sense is a definite one, produced by the stream of the breath (phonation current) at a certain position of the speech-tools Sound wave.
  • the generation and perception of sounds is the subject of phonetics.
  • a phoneme or phon is understood as the smallest phonetic unit of the spoken language.
  • consonant in the context of the invention is generally understood a sound whose articulation includes a narrowing of the vocal tract, so that the respiratory air flow is completely or partially blocked and there is audible turbulence (air turbulence). Consonants are inhibitor overcoming sounds. In particular, consonants within the meaning of the invention are not limited to the consonant letters (B, C, D, F, etc.).
  • the invention is intended to improve speech intelligibility, it is possible to limit the application of the invention to the periods in which a speech signal is present.
  • the spectral energy distribution of a detected sound or the distribution of the maxima and minima in the signal level is then detected and mapped to the corresponding distribution in the transposed signal.
  • the hearing aid according to the invention comprises means for transforming the input signal or a signal resulting therefrom into the frequency domain, wherein the signal processing takes place at least partially in the frequency domain.
  • sounds in particular consonants or fricatives, can be detected more easily in the frequency domain than in signal processing in the time domain.
  • some specific features of the input signal are easier to capture in the frequency domain than in the time domain.
  • the filtering by the filter means in the time domain.
  • narrowband filters can be used at the end of the signal processing performed by a given hearing aid contribute to the fact that a spectral distribution characteristic of certain sounds or fricatives is mapped onto the limited frequency range of the output signal.
  • FIG. 1 shows in a simplified block diagram the structure of a hearing aid according to the prior art.
  • Hearing aids have in principle as essential components one or more input transducers, an amplifier and an output transducer.
  • the input transducer is usually a sound receiver, z. As a microphone, or an electromagnetic receiver, for. B. an induction coil.
  • the output transducer is usually used as an electroacoustic transducer, z. As miniature speaker or handset, 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. 2 illustrated by the example of a behind-the-ear hearing aid 1.
  • a hearing aid housing 2 for carrying behind the ear two microphones 3 and 4 are installed for receiving the sound from the environment.
  • a signal processing unit 5 which is also integrated into the hearing aid housing 2, processes the microphone signals and amplifies them.
  • the output signal of the signal processing unit 5 is transmitted to a loudspeaker or earpiece 6, 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 hearing aid wearer.
  • the power supply of the hearing device and in particular of the signal processing unit 5 is effected by a likewise integrated into the hearing aid housing 2 battery. 7
  • FIG. 2 shows in a simplified block diagram a hearing aid according to the invention.
  • a microphone M receives an acoustic input signal ES and converts this into an electrical input signal.
  • the electrical input signal is first supplied to a filter bank FB, in which the electrical input signal is divided into frequency bands (channels). A division into 3 to 16 frequency bands is usual. But it is also a much larger number of frequency bands or even a transformation in the so-called. Frequency range possible.
  • the signals of the individual frequency bands are first fed to a signal analysis and control unit SAS for signal analysis.
  • This controls by the control signal S1 the combination of a plurality of frequency bands to a frequency band and the transposition of the resulting frequency band.
  • three output frequency bands are mapped to a target frequency band.
  • a synthesis filter bank SFB the transposed frequency bands are combined again.
  • the synthesis filter bank SFB performs an addition of the signals in the individual transposed frequency bands. The result is the transposed output signal TS.
  • signal processing for example final amplification, of the transposed output signal TS in a further signal processing unit SV2 continues to take place.
  • the resulting output signal AS is finally fed to a receiver R, which converts the output signal into an acoustic output signal converts, if necessary, the hearing of a user is supplied.
  • the signal analysis and control unit SAS of the hearing aid device 11 further comprises a sound-detector device by means of the sounds, in particular consonants, especially fricatives, are recognizable in the electrical input signal ES on the basis of their characteristic features. Certain sounds are characterized in particular by a special spectral energy distribution or a special relation of the maxima and minima of their signal levels as a function of the signal frequency. The signal analysis and control unit SAS also recognizes when the characteristic of a particular sound energy distribution or relation of the maxima and minima is destroyed by the special frequency transposition.
  • a control signal S2 is then generated and fed to the adjustable filter F, so that an output signal AS whose spectrum is similar to the spectrum of the input signal ES apart from the transposition into another frequency range is produced by the filter effect of the filter F controlled in this way. In particular, the number and order of the maxima and minima in the signal levels is restored.
  • the generation of the control signal S2 can also take place taking into account the transposed signal TS.
  • the synthesis filter bank SFB is suitably connected to the signal analysis and control unit SAS.
  • the control of the filter F is performed on the basis of the result of a comparison of the input signal ES with the transposed signal TS in the signal analysis and control unit SAS.
  • FIG. 3 illustrates the signal shaping in the frequency transposition with a hearing aid according to the invention according to FIG. 2 .
  • a graph D1 the spectrum of the input signal is indicative of a particular fricative present in the input signal at a particular time shown.
  • the characteristic shape of this fricative is lost with regard to the signal spectrum.
  • the graph D2 shows the spectrum of the fricative after the frequency transposition.
  • this is done by suppressing a certain frequency range in the transposed signal TS by the filter, so that again the special characteristic shape with two maxima and an intermediate minimum (see graph D3) is generated.
  • the acoustic impression of the fricative contained in the input signal is largely restored in the output signal.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Otolaryngology (AREA)
  • Neurosurgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Computational Linguistics (AREA)
  • Quality & Reliability (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP12158846A 2011-03-31 2012-03-09 Procédé d'amélioration de l'intelligibilité de la parole avec un appareil auditif ainsi qu'appareil auditif Withdrawn EP2506254A1 (fr)

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DE102011006472A DE102011006472B4 (de) 2011-03-31 2011-03-31 Verfahren zur Verbesserung der Sprachverständlichkeit mit einem Hörhilfegerät sowie Hörhilfegerät

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EP2506254A1 true EP2506254A1 (fr) 2012-10-03

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US (1) US8644538B2 (fr)
EP (1) EP2506254A1 (fr)
DE (1) DE102011006472B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2575377A1 (fr) * 2011-09-29 2013-04-03 Siemens Medical Instruments Pte. Ltd. Réglage d'amplification d'un appareil auditif

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113744750B (zh) * 2021-07-27 2022-07-05 北京荣耀终端有限公司 一种音频处理方法及电子设备

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5014319A (en) 1988-02-15 1991-05-07 Avr Communications Ltd. Frequency transposing hearing aid
DE69105154T2 (de) 1990-02-13 1995-03-23 Matsushita Electric Ind Co Ltd Sprachsignalverarbeitungsvorrichtung.
EP1441562A2 (fr) 2003-03-06 2004-07-28 Phonak Ag Procédé de transposition de fréquence et utilisation du procédé dans une prothèse auditive et un dispositif de communication
EP1686566A2 (fr) * 2005-04-29 2006-08-02 Phonak AG Traitenment de son avec transposition de fréquence
US20090112594A1 (en) 2007-10-31 2009-04-30 At&T Labs System and method of using acoustic models for automatic speech recognition which distinguish pre- and post-vocalic consonants
WO2009143898A1 (fr) * 2008-05-30 2009-12-03 Phonak Ag Procédé permettant l’adaptation du son par modification de fréquence dans une prothèse auditive, et prothèse auditive

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6236731B1 (en) * 1997-04-16 2001-05-22 Dspfactory Ltd. Filterbank structure and method for filtering and separating an information signal into different bands, particularly for audio signal in hearing aids

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5014319A (en) 1988-02-15 1991-05-07 Avr Communications Ltd. Frequency transposing hearing aid
DE69105154T2 (de) 1990-02-13 1995-03-23 Matsushita Electric Ind Co Ltd Sprachsignalverarbeitungsvorrichtung.
EP1441562A2 (fr) 2003-03-06 2004-07-28 Phonak Ag Procédé de transposition de fréquence et utilisation du procédé dans une prothèse auditive et un dispositif de communication
EP1686566A2 (fr) * 2005-04-29 2006-08-02 Phonak AG Traitenment de son avec transposition de fréquence
US20090112594A1 (en) 2007-10-31 2009-04-30 At&T Labs System and method of using acoustic models for automatic speech recognition which distinguish pre- and post-vocalic consonants
WO2009143898A1 (fr) * 2008-05-30 2009-12-03 Phonak Ag Procédé permettant l’adaptation du son par modification de fréquence dans une prothèse auditive, et prothèse auditive

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MUNOZ C M A ET AL: "Frequency lowering processing for listeners with significant hearing loss", ICECS'99. PROCEEDINGS OF ICECS'99. 6TH IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS; 5-8 SEPT. 1999; PAFOS, CYPRUS, IEEE, PISCATAWAY, NJ, USA, vol. 2, 5 September 1999 (1999-09-05), pages 741 - 744, XP010361677, ISBN: 978-0-7803-5682-5, DOI: 10.1109/ICECS.1999.813215 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2575377A1 (fr) * 2011-09-29 2013-04-03 Siemens Medical Instruments Pte. Ltd. Réglage d'amplification d'un appareil auditif

Also Published As

Publication number Publication date
DE102011006472B4 (de) 2013-08-14
US20120250917A1 (en) 2012-10-04
US8644538B2 (en) 2014-02-04
DE102011006472A1 (de) 2012-10-04

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