EP1912472A1 - Verfahren zum Betreiben einer Hörhilfe, sowie Hörhilfe - Google Patents

Verfahren zum Betreiben einer Hörhilfe, sowie Hörhilfe Download PDF

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Publication number
EP1912472A1
EP1912472A1 EP07117190A EP07117190A EP1912472A1 EP 1912472 A1 EP1912472 A1 EP 1912472A1 EP 07117190 A EP07117190 A EP 07117190A EP 07117190 A EP07117190 A EP 07117190A EP 1912472 A1 EP1912472 A1 EP 1912472A1
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EP
European Patent Office
Prior art keywords
hearing aid
speech
electrical
acoustic
signal
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Withdrawn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
EP07117190A
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German (de)
English (en)
French (fr)
Inventor
Eghart Fischer
Matthias Fröhlich
Jens Hain
Henning Puder
André Steinbuß
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 GmbH
Original Assignee
Siemens Audioligische Technik GmbH
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Filing date
Publication date
Application filed by Siemens Audioligische Technik GmbH filed Critical Siemens Audioligische Technik GmbH
Publication of EP1912472A1 publication Critical patent/EP1912472A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—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
    • H04R2225/43—Signal processing in hearing aids to enhance the speech intelligibility

Definitions

  • the invention relates to a method for operating a hearing aid consisting of a single or two hearing aids. Furthermore, the invention relates to a corresponding hearing aid or a corresponding hearing aid.
  • noise or unwanted acoustic signals that interfere with the voice of a counterpart or a wanted acoustic signal are omnipresent. People with a hearing loss are particularly susceptible to such noise. Conversations in the background, acoustic interference with digital devices (cell phones), car or other environmental noise can make it very difficult for a person with hearing loss to understand a desired speaker. Reducing the level of noise in an acoustic signal coupled with an automatic focus on a desired acoustic signal component can significantly improve the performance of an electronic speech processor as used in modern hearing aids.
  • Hearing aids with digital signal processing have been introduced in the recent past. They include one or more microphones, A / D converters, digital signal processors and speakers. Usually, the digital signal processors divide the incoming signals into a plurality of frequency bands. Within each band, signal amplification and processing may be individually adjusted in accordance with requirements for a particular hearing aid wearer to improve the intelligibility of a particular component. Furthermore, algorithms for feedback and noise minimization are available in digital signal processing, but have significant disadvantages. A disadvantage of the currently existing algorithms for noise minimization z. B. whose maximum achievable improvement in hearing aid acoustics when speech and background sounds are in the same frequency region and therefore unable to distinguish between spoken speech and background noise. (See also EP 1 017 253 A2 )
  • acoustic signal processing there are spatial (eg directional microphone, beamforming), statistical (eg blind source separation) or mixed methods, which are u. a. by means of algorithms from several simultaneously active sound sources can separate a single or a plurality thereof.
  • the blind source separation by means of statistical signal processing of at least two microphone signals allows to perform a separation of source signals without prior knowledge of their geometric arrangement.
  • This method has advantages over conventional directional microphone approaches when used in hearing aids.
  • BSS method Blind Source Separation
  • n microphones up to n sources can be separated, i. H. n Generate output signals.
  • the control of directional microphones in the sense of blind source separation is subject to ambiguity, as soon as several competing sources of use, eg. B. speaker, present simultaneously.
  • the blind source separation allows in principle the separation of the different sources, provided that they are spatially separated; the ambiguity, however, reduces the potential benefit of a directional microphone, although it is precisely in such scenarios that a directional microphone can be very useful for improving speech intelligibility.
  • the hearing aid or the mathematical algorithms for blind source separation are in principle faced with the problem of having to decide which of the signals generated by the blind source separation should be passed on most advantageously to the user of the algorithm, ie the hearing aid wearer.
  • the choice made by this algorithm must be so based on assumptions about the probable will of the listener.
  • the invention provides, after a source separation, to carry out a feature analysis of separate acoustic signals with the aim of selecting the acoustic source or those acoustic sources with a high probability of spoken language contained therein by the hearing aid as the voice acoustic source or speech acoustic sources offered to the hearing aid wearer ,
  • the hearing aid wearer can then decide whether or not he wishes this source or these sources, which can be done by any desired input device or speech recognition in or on the hearing aid or a remote control for the hearing aid. This can also be done automatically by the hearing aid (see below).
  • a method for operating a hearing aid wherein for the tracking and selective amplification of a voice acoustic source or an electrical speech signal, a signal processing of the hearing aid for preferably all the electrical acoustic signals available to it determines a probability for a spoken language contained therein and assigns.
  • the acoustic source or the acoustic sources with the highest linguistic probability or the highest linguistic probabilities are tracked by the signal processing and particularly taken into account in an acoustic output signal of the hearing aid.
  • a hearing aid is provided according to the invention, wherein an acoustic signal (signal processing) of the hearing aid electrical acoustic signals a respective probability for spoken language contained therein can be assigned.
  • the acoustic module selects at least one electrical voice signal from it, which is particularly considered in an output sound of the hearing aid.
  • the hearing aid it is possible, depending on the number of existing microphones in the hearing aid to select a single or a plurality of voice acoustic sources of ambient sound and emphasize in the output sound of the hearing aid. In this case, it is possible to set a volume of the voice acoustic source or of the voice acoustic sources in the output sound of the hearing aid as desired.
  • the signal processing has a demixing module, which preferably operates as a device for blind source separation for separating the acoustic sources of ambient sound. Furthermore, the signal processing has a post-processor module, which establishes a corresponding operating mode "speech" in the hearing aid upon detection of a high-probability voice source. Furthermore, the signal processing may comprise a preprocessor module - the electrical output signals of which are the electrical input signals of the demix module - which normalizes and processes electrical acoustic signals originating from microphones of the hearing aid. Regarding the preprocessor module and the demixing module (unmixer), please refer to the EP 1 017 253 A2 Refer to paragraphs [0008] to [0023].
  • the hearing aid or the signal processor or the post-processor module carries out a feature analysis of the electrical acoustic signals in such a way that for each of the electrical acoustic signals a probability for spoken voice information contained therein is determined simultaneously and subsequently by the signal processing or the Post-processor module mainly the one or the highest acoustic probability electrical acoustic signals are output to a hearing aid or speaker of the hearing aid, which converts the electrical acoustic signals into analog acoustic information.
  • a source separation method for acoustic signals is extended by a feature analysis which determines the probability of speech in the separate source signals. outgoing From the determined linguistic probabilities, the acoustic source or the acoustic sources with the greatest linguistic probability are selected and supplied to the hearing aid wearer.
  • the automatable selection of the one or more acoustic source signals in which the speech understanding is maximum is advantageous. Noise signals that contain no speech are preferably not focused. Speech signals that are greatly disturbed by interfering signals (too) provide a lower probability of speech than undisturbed speech signals and are therefore also not preferred.
  • the method is based on the assumption that language and the understanding of this language is the most important thing for the hearing aid user.
  • the acoustic source selection is independent of a direction of incidence with respect to the hearing aid.
  • the invention is not limited to such blind source separation, but rather is intended to broadly include source separation methods for acoustic signals. Therefore, this BSS module is also referred to as demixing module.
  • a "tracking" of an electrical speech signal by a hearing aid of a hearing aid wearer is mentioned.
  • This is to be understood as one of the hearing aid or a signal processing of the hearing aid or a post-processor module of the signal processing selection of one or a plurality of electrical speech signals which are selected by the hearing aid electrically or electronically from other sources of acoustic ambient sound and which in a respect to the other acoustic sources of ambient sound amplified way, d. H. in a way perceived as louder for the hearing aid wearer.
  • tracking the electrical speech signal is a position of the hearing aid wearer in the room, in particular a position of the hearing aid in the room, d. H. a viewing direction of the hearing aid wearer, preferably not considered.
  • Fig. 1 shows the state of the art, as by the EP 1 017 253 A2 (see paragraph [0008] ff) is taught.
  • a hearing aid 1 has two microphones 200, 210, which together can form a directional microphone system, for generating two electrical acoustic signals 202, 212.
  • Such a microphone arrangement gives the two electrical output signals 202, 212 of the microphones 200, 210 an inherent directional characteristic.
  • Each of the microphones 200, 210 receives an ambient sound 100 that is a composite of unknown, acoustic signals from an unknown number of acoustic sources.
  • the electrical acoustic signals 202, 212 are processed primarily in three stages.
  • the electrical acoustic signals 202, 212 are pre-processed in a preprocessing module 310 to improve the directional characteristic, which begins with a normalization of the original signals (equalizing the signal strength).
  • a blind source separation takes place in a BSS module 320, wherein the output signals of the preprocessor module 310 are subject to a demixing process.
  • the output signals of the BSS module 320 are post-processed in a post-processor module 330 to produce a desired electrical output signal 332 which serves as input to a handset 400 and loudspeaker 400 of the hearing aid 1, respectively, and a sound generated thereby to the hearing aid wearer leave.
  • steps 1 and 3 that is, preprocessor module 310 and postprocessor module 330, are optional.
  • FIG. 2 now shows a first embodiment of the invention, wherein in a signal processing 300 of the hearing aid 1 a demixing module 320, hereinafter referred to as BSS module 320, is located, to which a post-processor module 330 is connected downstream.
  • a preprocessor module 310 can be provided which appropriately prepares or prepares the input signals for the BSS module 320.
  • the signal processing 300 is preferably carried out in a DSP (Digital Signal Processor) or in an ASIC (Application Specific Integrated Circuit).
  • acoustic sources 102, 104 or signal sources 102, 104 exist in ambient sound 100, one of these acoustic sources 102 being a speech source 102 and the other acoustic source 104 being a noise source 104.
  • the voice acoustic source 102 is to be selected and tracked by the hearing aid 1 or the signal processor 300 and be a main acoustic component of the handset 400, so that an output sound 402 of the loudspeaker 400 mainly contains this signal (102).
  • the two microphones 200, 210 of the hearing aid 1 each receive a mixture of the two acoustic signals 102, 104 - illustrated by the dotted arrow (representing the preferred, acoustic signal 102) and the solid arrow (representing the non-preferred, acoustic signal 104). - and deliver them either to the preprocessor module 310 or equal to the BSS module 320 as electrical input signals.
  • the two microphones 200, 210 can be distributed as desired. They may be located in a single hearing aid 1 of the hearing aid 1 or distributed to both hearing aids 1. In addition, it is possible, for. B. one or both microphones 200, 210 outside the hearing aid 1, z. B.
  • the electrical input signals of the BSS module 320 need not necessarily originate from a single hearing device 1 of the hearing aid 1.
  • a hearing aid 1 consisting of two hearing aids 1 has a total of four or six microphones.
  • the preprocessor module 310 prepares the data for the BSS module 320, which in turn forms two separate output signals from its two mixed input signals, depending on the capability, each of which represents one of the two acoustic signals 102, 104.
  • the two separate output signals of the BSS module 320 are input signals for the post-processor module 330, in which it is now decided which of the two acoustic signals 102, 104 is output to the loudspeaker 400 as an electrical output signal 332.
  • the post-processor module 330 performs in parallel a feature analysis of the electrical acoustic signals 322, 324, wherein for each of these electrical acoustic signals 322, 324 a probability is determined for a human language contained therein. Subsequently, the post-processor module 330 selects the one acoustic signal 322 having the highest inherent speech likelihood and outputs this electrical acoustic signal 322 to the speaker 400 in a boosted manner as the output electrical acoustic signal 332 (corresponding substantially to the electrical acoustic signal 322).
  • This ambient sound 100 is recorded in each case by three microphones, each of which outputs an electrical microphone signal x 1 (t), x 2 (t), x n (t) to the signal processor 300.
  • the signal processor 300 has no preprocessor module 310, but may preferably contain this. (This also applies analogously to the first embodiment of the invention).
  • the electrical microphone signals x 1 (t), x 2 (t), x n (t) are input signals to the BSS module 320, which in each case in the electrical microphone signals x 1 (t), x 2 (t), x n (t) acoustic sources s 1 (t), s 2 (t), s n (t) separated and as electrical output signals s' 1 (t), s' 2 (t), s' n (t) to the post-processor module 330.
  • two electrical acoustic signals namely s ' 1 (t) and s' n (t) (in this exemplary embodiment corresponds to a great extent to the acoustic sources s 1 (t) and s n (t) sufficient speech information, ie the hearing aid 1 is at least sufficiently capable of delivering such an acoustic signal s ' 1 (t), s' n (t) to the hearing aid wearer in such a way that he / she can correctly interpret the information contained therein, ie contained therein Speech information understands at least sufficiently.
  • the third acoustic signal s' 2 (t) (corresponds in this embodiment as much as possible to the acoustic source s 2 (t)) contains no or barely usable speech information.
  • a feature analysis of the electrical acoustic signals s' 1 (t), s' 2 (t), s' n (t) is now performed and for each electrical acoustic signal s' 1 (t), s' 2 (t) , s' n (t) separately determines a probability p 1 (t), p 2 (t), p n (t) for human speech information contained therein.
  • the post-processor module 330 selects that or, as in this case, those electrical acoustic signals s ' 1 (t), s' n (t) with the highest speech probabilities and makes them available in the form of the output signal 332 to the loudspeaker 400.
  • the feature analysis in the post-processor module 330 can always run in the background of the hearing aid 1 and upon occurrence of an electrical speech signal 322; s ' 1 (t), s' n (t) are initiated. It is also possible to call the feature analysis according to the invention by the hearing aid wearer. That is, an establishment of the operating mode "speech" of the hearing aid 1 is initiated by an input device that can be called or actuated by the hearing aid wearer.
  • a button or switch be (not shown in the figures).
  • the input device as a voice control with an associated speaker recognition module form, which is tuned to a voice of the hearing aid wearer, wherein the input device is at least partially formed in the hearing aid 1 and / or at least partially in the remote control of the hearing aid 1.
  • the hearing aid 1 which of the electrical voice signals 322; s ' 1 (t), s' n (t) can preferably be reproduced on the hearing aid wearer as the output sound 402, s "(t) .
  • This can be an angle of incidence of the corresponding acoustic source 102, 104; s 1 (t), s 2 (t ), s n (t) may be on the hearing aid 1, with certain angles of incidence being preferred, for example the 0 ° or 90 ° lateral direction of the hearing aid wearer may be preferred.
  • s ' 1 (t), s' n (t) also apart from their different probabilities p 1 (t), p 2 (t), p n (t) for speech information contained therein (this of course applies to all embodiments of Invention) - whether one of the electrical speech signals 322; s ' 1 (t), s' n (t) is a predominant or a comparatively loud electrical speech signal 322; s ' 1 (t), s' n (t) ,
  • this other module of the hearing aid 1 is to be included in the post-processor module 330, ie, in such an embodiment, the post-processor module 330 comprises this other module.
  • the present document relates inter alia to a post-processor module 20 of the EP 1 017 253 A2 (Reference numeral after the EP 1 017 253 A2 ), in which by means of a feature analysis one or more speakers are selected for an electrical output signal of the post-processor module 20 and at least amplified therein. See also paragraph [0025] of EP 1 017 253 A2 . Further, in the invention, the preprocessor module and the BSS module such as the preprocessor 16 and the unmixer 18 of the EP 1 017 253 A2 be constructed. See in particular paragraphs [0008] to [0024] of EP 1 017 253 A2 ,
  • the invention ties in with the EP 1 655 998 A2 to provide for a hearing aid wearer stereo voice signals or to enable a binaural acoustic care with speech.
  • the invention (notation according to the EP 1 655 998 A2 ) the output signals z1, z2 respectively for the right (k) and left (k) of a second filter device of EP 1 655 998 A2 (see Figs. 2 and 3) for accentuation / amplification of the corresponding acoustic source downstream.
  • it is possible to use the invention in the EP 1 655 998 A2 apply to the effect that it intervenes according to the teached there blind source separation and even before the second filter device. Ie. According to the invention, a selection of a signal y1 (k), y2 (k) takes place (see FIG. 3 of FIG EP 1 655 998 A2 ).

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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)
EP07117190A 2006-10-10 2007-09-25 Verfahren zum Betreiben einer Hörhilfe, sowie Hörhilfe Withdrawn EP1912472A1 (de)

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Cited By (2)

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EP2120484A3 (de) * 2008-05-13 2010-05-26 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betreiben eines Hörgeräts und Hörgerät
EP2200341B1 (de) * 2008-12-16 2015-02-25 Siemens Audiologische Technik GmbH Verfahren zum Betrieb eines Hörhilfegerätes sowie Hörhilfegerät mit einer Quellentrennungseinrichtung

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FR2948484B1 (fr) * 2009-07-23 2011-07-29 Parrot Procede de filtrage des bruits lateraux non-stationnaires pour un dispositif audio multi-microphone, notamment un dispositif telephonique "mains libres" pour vehicule automobile
DE102010012622B4 (de) * 2010-03-24 2015-04-30 Siemens Medical Instruments Pte. Ltd. Binaurales Verfahren und binaurale Anordnung zur Sprachsteuerung von Hörgeräten
US9124991B2 (en) * 2011-10-26 2015-09-01 Cochlear Limited Sound awareness hearing prosthesis
DE102012206759B4 (de) * 2012-04-25 2018-01-04 Sivantos Pte. Ltd. Verfahren zum Steuern einer Richtcharakteristik und Hörsystem
US9398379B2 (en) 2012-04-25 2016-07-19 Sivantos Pte. Ltd. Method of controlling a directional characteristic, and hearing system
US9936309B2 (en) * 2013-05-24 2018-04-03 Alarm.Com Incorporated Scene and state augmented signal shaping and separation
US9762742B2 (en) 2014-07-24 2017-09-12 Conexant Systems, Llc Robust acoustic echo cancellation for loosely paired devices based on semi-blind multichannel demixing
CN106101969A (zh) * 2016-08-18 2016-11-09 孟玲 增进语音即时输出的助听器
CN109302666B (zh) * 2018-09-13 2021-06-11 中国联合网络通信集团有限公司 一种提醒装置以及方法

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DE19948907A1 (de) * 1999-10-11 2001-02-01 Siemens Audiologische Technik Verfahren zur Signalverarbeitung in einer Hörhilfe sowie Hörhilfe
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DE19948907A1 (de) * 1999-10-11 2001-02-01 Siemens Audiologische Technik Verfahren zur Signalverarbeitung in einer Hörhilfe sowie Hörhilfe
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
EP2120484A3 (de) * 2008-05-13 2010-05-26 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betreiben eines Hörgeräts und Hörgerät
US8737652B2 (en) 2008-05-13 2014-05-27 Siemens Medical Instruments Pte. Ltd. Method for operating a hearing device and hearing device with selectively adjusted signal weighing values
EP2200341B1 (de) * 2008-12-16 2015-02-25 Siemens Audiologische Technik GmbH Verfahren zum Betrieb eines Hörhilfegerätes sowie Hörhilfegerät mit einer Quellentrennungseinrichtung

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