WO2007096247A1 - Dispositif auditif assurant une transition douce entre des modes opérationnels d'une aide auditive - Google Patents

Dispositif auditif assurant une transition douce entre des modes opérationnels d'une aide auditive Download PDF

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Publication number
WO2007096247A1
WO2007096247A1 PCT/EP2007/051159 EP2007051159W WO2007096247A1 WO 2007096247 A1 WO2007096247 A1 WO 2007096247A1 EP 2007051159 W EP2007051159 W EP 2007051159W WO 2007096247 A1 WO2007096247 A1 WO 2007096247A1
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WO
WIPO (PCT)
Prior art keywords
signal
directional
signals
specific
channel
Prior art date
Application number
PCT/EP2007/051159
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English (en)
Inventor
Christian C. BÜRGER
Thomas Kaulberg
Jakob Hager Rasmussen
Original Assignee
Oticon A/S
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Oticon A/S filed Critical Oticon A/S
Publication of WO2007096247A1 publication Critical patent/WO2007096247A1/fr

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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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/43—Electronic input selection or mixing based on input signal analysis, e.g. mixing or selection between microphone and telecoil or between microphones with different directivity characteristics
    • 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
    • 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

Definitions

  • This invention relates to a hearing device and method for providing smooth transition between modes in a hearing aid.
  • this invention relates to a hearing device and a method incorporated therein for providing a smooth transition between an omni-directional and a directional mode.
  • a hearing device may be hearing aids, such as an in- the-ear (ITE), completely-in-canal (CIC) or behind-the-ear (BTE) hearing aids, headphones, headsets, hearing protective gear, intelligent earplugs etc.
  • ITE in- the-ear
  • CIC completely-in-canal
  • BTE behind-the-ear
  • state of the art hearing aids comprise a directional microphone system operated so as to continuously optimize the hearing situation for the user of a hearing aid in various sound environments.
  • the directional microphone system is switch-able between an omni-directional mode, wherein the signals of the microphones have an invariant spatial sensitivity, and a directional mode, wherein signals of the microphones are weighted so as to focus spatial sensitivity in a direction in front of the user of the hearing aid.
  • European patent application no. EP 1 192 838 discloses a hearing aid comprising a plurality of microphones generating input signals to an inverting and summing means establishing signals of 0 th to n th order. That is, 0 th order is omnidirectional or non-differential, 1 st order is a directional signal established from the difference between two microphone signals from two spaced apart microphones, and 2 nd order is a directional signal established from the difference between two 1 st order directional signals.
  • the hearing aid device further comprises a filterbank receiving the omni-directional and directional signals and dampens said signals in accordance with frequency and order. Thus each of said signals is processed in accordance with an independent transfer function before being summed in a speaker driving unit.
  • the hearing aid device achieves a greater directionality in the high frequency spectrum by adding 2 nd order directional signals to 1 st order directional signals when the sound environment recorded by the microphones comprises high frequency components.
  • An object of the present invention is to provide a system and method providing a smooth transition between operational modes of a hearing aid.
  • a particular advantage of the present invention is the provision of a frequency independent omni-directional to directional mode switch.
  • a particular feature of the present invention is the provision of a linear transformation between the omni-directional and directional modes.
  • a hearing device for processing sound and comprising a plurality of microphones each adapted to convert a sound to an electric sound signal, a filterbank connected to each of said plurality of microphones and adapted to split said electric sound signals into a series of frequency channel signals, a series of decision units each comprising a summing module connected to a specific frequency channel of each of said filterbanks and adapted to sum frequency channel signals of said specific frequency channels thereby generating a first and second directional signal and a mixing module connected to said summing module and adapted to mix said first and second directional signal according to content thereof and to generate a channel-specific signal, a merging unit connected to said series of decision units and adapted to receive said channel-specific signals and to merge said channel-specific signals into an output signal, and a speaker unit connected to said merging unit and adapted to generate a processed sound from said output signal.
  • the hearing device thus, advantageously, may perform a channel-specific determination of whether an omni-directional, directional or a mixture of both (operational modes) should be generated for a particular frequency channel. Allowing each of the decision units to determine which operational mode is to used for a specific channel enables the hearing device to provide a transition between modes which is perceived smooth, i.e. not abrupt .
  • the plurality of microphones according to the first aspect of the present invention may comprise a first and second microphone spaced apart so that the first microphone is affected by a first spatial sound pressure and the second microphone is affected by a second spatial sound pressure.
  • the electric sound signals from the first and second microphones may be used for generating an omni-directional signal and a directional signal.
  • Each of the plurality of microphones may be connected to a dedicated filterbank, which splits the electric sound signals into a number of frequency channels, such as in the range between 2 to 64, e.g. 16 or 32.
  • the filterbanks connected to each microphone may comprise predefined frequency boundaries such as 250Hz, 500Hz, 750Hz, and so on.
  • the individual bands of the filterbank may have the same bandwidth (uniform filterbank) or non-uniformly spaced bands (e.g. logarithmic spacing) or critical bands, which have bandwidths determined in accordance with an ears frequency sensitivity, i.e. the ear is more sensitive in some frequency areas compared with other frequency areas and therefore the individual bands of the filterbank may be divided in accordance with this sensitivity.
  • the frequency channel signals from a specific frequency channel of one filterbank corresponds to associated frequency channel signals from the same specific frequency channel of another filterbank .
  • the decision unit according to the first aspect of the present invention may be defined for a specific frequency channel of the filterbanks.
  • the number of frequency channels determines the number of decision units.
  • the series decision units may each comprise a communication unit connected to the mixing modules and adapted to communicate control parameters with one another and/or with a processor unit.
  • the decision units advantageously, may in the process of selecting an appropriate mode for a frequency channel consider the modes of the neighbouring decision units.
  • the summing module may comprise a first and second summing element connected to a specific frequency channel of each filterbank and performing a real and complex summation, respectively.
  • the first summing element generates an omni-directional signal constituting the first directional signal
  • the second summing element generates a directional signal constituting the second directional signal.
  • the mixing module may comprise a detector element connected to the first and second summing element and adapted to determine whether the first and second directional signal has a level and/or modulation index above or below a predetermined threshold and to generate a detector signal based thereon.
  • the mixing module may further comprise a processor element connected to the detector element and adapted to generate a control parameter based on said detector signal. The processor element thereby is configured to establish a control parameter, which is a measure for how to mix the first directional signal
  • the control parameter may provide a linear transition between an omni-directional mode and directional mode thereby ensuring a user of the hearing device is provided a smooth and substantially non-perceivable change in operational modes.
  • the control parameter according to the first aspect of the present invention may be in the range between 0 and 1, where "0 provides a fully directional signal and "1 provides a fully omni-directional signal.
  • the mixing module factorizes the first directional signal by the control parameter and the second directional signal by one minus the control parameter, which factorized first and second directional signals subsequently are mixed with one another.
  • a method for processing sound comprising converting a first and second spatial sound to a first and second electric sound signal, splitting said first and second electric sound signals individually into a first and second series of frequency channel signals, summing said first and second frequency channel signals of specific frequency channels thereby generating a first and second directional signal for each specific frequency channel, mixing said first and second directional signal according to content thereof, generating a channel-specific signal based on said mixing, merging said channel-specific signals into an output signal, and generating a processed sound from said output signal.
  • the features of the hearing device according to the first aspect of the present invention may be incorporated in the method according to the second aspect of the present invention.
  • a decision unit comprising a summing module connected to specific frequency channels of filterbanks and adapted to sum frequency channel signals of said specific frequency channels thereby generating a omni-directional and directional signal and a mixing module connected to said summing module and adapted to mix said omni-directional signal and directional signal according to content thereof and to generate a channel-specific output signal based thereon.
  • the features of the hearing device according to the first aspect of the present invention may be incorporated in the method according to the second aspect of the present invention.
  • figure 1 shows a block diagram of a hearing device according to a first embodiment of the present invention
  • figure 2 shows a graph of transition between omni-directional mode and directional mode of the hearing device according to the first embodiment of the present invention.
  • figure 3 shows a block diagram of a hearing device according to a second embodiment of the present invention.
  • FIG. 1 shows a hearing device 100 according to a first embodiment of the present invention.
  • the hearing device 100 may be implemented in a wide variety of ear level devices such as ear assistive devices, namely hearing aids, headphones, or headsets, or ear protective devices, namely hearing protectors, ear protectors, or intelligent earplugs.
  • ear assistive devices namely hearing aids, headphones, or headsets
  • ear protective devices namely hearing protectors, ear protectors, or intelligent earplugs.
  • intelligent earplugs namely hearing protectors, ear protectors, or intelligent earplugs.
  • the term "intelligent" is in this context to be construed as comprising sound processing capability.
  • the hearing device 100 comprises a first microphone 102 measuring a sound pressure of a first spatial point and converting this sound pressure to a first electric sound signal.
  • the first microphone 102 is coupled to a first filterbank 104 for dividing first electric sound signal in one or more frequency channels, such as 2, 3, 4, 8, 16 or 32 frequency channels.
  • first filterbank 104 for dividing first electric sound signal in one or more frequency channels, such as 2, 3, 4, 8, 16 or 32 frequency channels.
  • the first sound signal is separated into a number of individual channel-specific first electric sound signals, such as a first channel covering the frequency band between 60 to 300 Hz, a second channel covering the frequency band between 301 to 1 KHz and so on until the frequency bandwidth of the first electric sound signal is covered.
  • the hearing device 100 further comprises a second microphone 106 spaced apart from the first microphone 102 and therefore measuring a sound pressure of a second spatial point.
  • the second microphone 106 converts this sound pressure to a second electric sound signal.
  • the second microphone 106 is coupled to a second filterbank 108 for dividing the second electric sound signal in one or more frequency channels corresponding to the frequency channels of the first filterbank 104. Hence as described with respect to the first sound signal the second sound signal is separated into a number of individual channel- specific second sound signals matching the channels defined for the first filterbank 104.
  • first and second filterbank 104 and 108 comprise the same number of frequency channels having identical frequency boundaries.
  • plurality of outputs of the first and second filterbank 104 and 108 comprise the same number of individual channel-specific first and second signals, respectively.
  • the outputs of the frequency channels of the first filterbank 104 and the frequency channels of the second filterbank 108 are forwarded in pairs to a plurality of decision units 110 so that the output of the first frequency channel of the first filterbank 104 and the output of the first frequency channel of the second filterbank 108 are forwarded to a first 112 and second 114 input of a first decision unit 116 of the plurality of decision units 110.
  • each output of the frequency channels of the first and second filterbanks 104 and 108 are forwarded to the plurality of decision units 110.
  • the plurality of decision units 110 consists of identical decision units for each frequency channel defined by the filterbanks 104 and 108.
  • the below description of the decision unit 116 may be extended to any decision unit of the plurality of decision units 110.
  • the first input 112 of the decision unit 116 is coupled to a first summing element 118, which is adapted to perform a real (i.e. non-complex) summing operation, and is further coupled to a second summing element 120, which is adapted to perform a complex summing operation.
  • the second input 114 is both coupled to the first summing element 118 and to the second summing element 120.
  • the first summing element 118 performs a summation of the frequency channel-specific signal established by the first filterbank 104 and forwarded to the first input 112 and the corresponding frequency channel- specific signal established by the second filterbank 108 and forwarded to the second input 114 thereby generating an omni- directional signal.
  • the second summing element 120 performs a summation of the frequency channel-specific signal established by the first filterbank 104 and forwarded to the first input 112 and the corresponding frequency channel- specific signal established by the second filterbank 108 and forwarded to the second input 114 thereby generating a directional signal.
  • the terms "real summing” and “complex summing” is in this context to be construed as ordinary addition of two electric signals and a pre-conditioned addition of two electric signals followed by post-conditioning, respectively.
  • the article “Directional patterns obtained from two or three microphones” by Stephen C. Thompson in Knowles Electronics communique dated 29 September 2000 gives detailed information regarding how complex summing may be performed. Further, the article “A simple adaptive first-order differential microphone” by Gary Elko et al, Proc. 1995 IEEE ASSP Workshop on Applications of Signal Proc. to Audio & Acoustics, Oct. 1995, shows how the directional signal may be generated.
  • the decision unit 116 further comprises a detector element designated in entirety by reference numeral 122 and receiving the omni-directional signal from the first summing element 118 and the directional signal from the second summing element 120.
  • the detector element 122 generates a detector signal based on the omni-directional and directional signals, which is forwarded to a processor element 124.
  • the processor element 124 is configured to calculate a control parameter " ⁇ " having a value between zero and one and determining a mixture of the omni-directional signal and the directional signal.
  • the omni-directional signal is, in addition, forwarded to a first multiplication element 126 multiplying the omnidirectional signal with the control parameter " ⁇ " .
  • the directional signal is, in addition, forwarded to a second multiplication element 128 multiplying the directional signal with a factor determined by one minus " ⁇ " (1- ⁇ ) .
  • the omni-directional and directional signals are factorized by the control parameter " ⁇ " .
  • the factorized omni-directional and directional signals are forwarded to a third summing element 130, which sums the factorized omni-directional and directional signals and provides an output signal for the decision unit 116.
  • the output signals from the plurality of decision units 110 are summed in an output summing unit 132 providing an output electric signal to a sound processor and speaker driving unit 134 converting the output electric signal to a processed electric signal, which is output as processed sound by a speaker unit 136.
  • the detector element 122 comprises a pair of level detectors 136 and 138 for receiving the omni-directional and directional signals and which are activated in accordance with level of the omnidirectional and directional signal, respectively. For example, if the level of the omni-directional signal is above a predetermined omni-directional mode threshold and the level of the directional signal is below a predetermined directional mode threshold, then the processor element 124 uses the level of the omni-directional and directional signals to determine a value of the control signal " ⁇ " so that a substantially linear transition between a full omni-directional mode (when the omni- directional signal is below the predetermined omni-directional mode threshold) and a full directional mode (when the directional signal is above the predetermined directional mode threshold) .
  • Figure 2 shows a graph 200 of the value of the control parameter " ⁇ " versus the level of the omni-directional and directional signals expressed in sound pressure level (SPL) .
  • SPL sound pressure level
  • the detector element 122 comprises a pair of modulation index detectors 140 and 142 for receiving the omni-directional and directional signals and which are activated in accordance with modulation index of the omni-directional and directional signal, respectively.
  • modulation index is in this context to be construed as a ratio between speech signal and noise background.
  • the processor element 124 uses the modulation index of the omni-directional and directional signals to determine a value of the control signal " ⁇ " so that a substantially linear transition between a full omni-directional mode (when the omni-directional signal is below the predetermined omni-directional mode threshold) and a full directional mode (when the directional signal is above the predetermined directional mode threshold) .
  • the detector element 122 comprises a pair of level detectors described with reference to the first embodiment of the detector unit and a pair of modulation index detectors described with reference to the second embodiment of the detector unit.
  • the processor element 124 uses the level as well as the modulation index of the omni-directional and directional signals to determine a value of the control signal " ⁇ " so that a substantially linear transition between a full omni-directional mode.
  • the hearing device 100 in a further embodiment of the present invention may comprise a communicator 144 connecting to the processor element 124 for receiving the control signal " ⁇ " generated for the particular decision unit 116.
  • the communicator 144 communicates this control signal " ⁇ " to neighbouring communicators of decision units handling the neighbouring frequency channels.
  • the communicator 144 similarly, receives control signals " ⁇ ' " from the neighbouring decision units and forwards these control signals " ⁇ ' " to the processor element 124, which may utilise these control signals " ⁇ ' " for further smoothing the value of " ⁇ " between the frequency channels.
  • FIG 3 shows a hearing device 300 according to a second embodiment of the present invention. Where the hearing device 300 comprises similar elements as described with reference to figure 1 the same reference numerals are used.
  • the hearing device 300 comprises a plurality of decision units 110 each receiving a frequency channel "fci” to “fc N ", the decision units 110 each perform a summation by means of the first summing element 118 so as to generate an omni-directional signal “Oi” to “O N " and a summation by means of the second summing element 120 so as to generate a directional signal "Di” to "D N " from the associated frequency channel signals.
  • Each of the decision units 116i to 116 N forwards the omni-directional and directional signals "O x " and “D 1 " to "O N “ and “D N “ to a processor unit 302 calculating a control signal " ⁇ " for each of the decision units from II6 1 to 116 N .
  • the processor unit 302 comprises a detector element 122 as described with reference to figure 1, which receives the omni-directional and directional signals from all of the decision units II61 to 116 N , and a processor element 124 generating control signals " ⁇ i" to " ⁇ N " based on the level and/or modulation index of the omni- directional and directional signals "O x " to "O N " and "D x " to
  • control signals " ⁇ i" to " ⁇ N " are communicated from the processor unit 302 to respective decision units II61 to 116 N .
  • Each decision unit II61 to 116 N comprises a calculation unit

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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)

Abstract

L'invention concerne un dispositif auditif (100, 300) destiné à traiter le son et comprenant une batterie de filtres (104, 108) destiné à diviser des signaux sonores électriques en une série de signaux de canaux de fréquences (fc1 à fcN), une série d'unités de décision (1161 à 116N) comprenant chacune un module de sommation (118, 120) destiné à effectuer la sommation de signaux de canaux de fréquences desdits canaux de fréquences spécifiques (fc1 à fcN), générant ainsi un signal omnidirectionnel (O1à ON) et directionnel (D1 to DN), ainsi qu'un module de mixage (126, 128, 130) destiné à mixer lesdits signaux omnidirectionnel (O1à ON) et directionnel (D1 to DN) en fonction du contenu associé et afin de générer un signal spécifique d'un canal, une unité de fusion (132) connectée à ladite série d'unités de décision (1161 to 116N) et conçue pour recevoir lesdits signaux spécifiques d'un canal et pour fusionner lesdits signaux spécifiques d'un canal en un signal de sortie.
PCT/EP2007/051159 2006-02-22 2007-02-07 Dispositif auditif assurant une transition douce entre des modes opérationnels d'une aide auditive WO2007096247A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06110278A EP1827058A1 (fr) 2006-02-22 2006-02-22 Appareil acoustique avec une transition graduelle entre des modes d'opération d'une prothèse auditive
EP06110278.6 2006-02-22

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WO2007096247A1 true WO2007096247A1 (fr) 2007-08-30

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008022533B3 (de) * 2008-05-07 2009-10-08 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betrieb eines Hörgeräts und Mikrofonsystem für ein Hörgerät
DE102009014053A1 (de) 2009-03-19 2010-09-30 Siemens Medical Instruments Pte. Ltd. Verfahren zum Einstellen einer Richtcharakteristik und Hörvorrichtung
US9763016B2 (en) 2014-07-31 2017-09-12 Starkey Laboratories, Inc. Automatic directional switching algorithm for hearing aids
EP2200346B1 (fr) 2008-12-22 2018-08-01 Sivantos Pte. Ltd. Prothèse auditive avec commutation automatique à algorithme

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DK1994791T3 (en) 2006-03-03 2015-07-13 Gn Resound As Automatic switching between omnidirectional and directional microphone modes in a hearing aid
DE102008049086B4 (de) * 2008-09-26 2011-12-15 Siemens Medical Instruments Pte. Ltd. Hörhilfegerät mit einem Richtmikrofonsystem sowie Verfahren zum Betrieb eines derartigen Hörhilfegerätes
DE102008064484B4 (de) 2008-12-22 2012-01-19 Siemens Medical Instruments Pte. Ltd. Verfahren zum Auswählen einer Vorzugsrichtung eines Richtmikrofons und entsprechende Hörvorrichtung
EP2360943B1 (fr) * 2009-12-29 2013-04-17 GN Resound A/S Formation de faisceau dans des dispositifs auditifs

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US20050041824A1 (en) * 2003-07-16 2005-02-24 Georg-Erwin Arndt Hearing aid having an adjustable directional characteristic, and method for adjustment thereof

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EP1196009A2 (fr) * 2000-10-04 2002-04-10 TOPHOLM & WESTERMANN APS Prothèse auditive avec ajustement adaptatif des transducteurs d'entrée
US20050025325A1 (en) * 2003-06-20 2005-02-03 Eghart Fischer Hearing aid and operating method with switching among different directional characteristics
US20050041824A1 (en) * 2003-07-16 2005-02-24 Georg-Erwin Arndt Hearing aid having an adjustable directional characteristic, and method for adjustment thereof

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008022533B3 (de) * 2008-05-07 2009-10-08 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betrieb eines Hörgeräts und Mikrofonsystem für ein Hörgerät
US8275162B2 (en) 2008-05-07 2012-09-25 Siemens Medical Instruments Pte. Ltd. Method for operating a hearing device and microphone system for hearing device
EP2200346B1 (fr) 2008-12-22 2018-08-01 Sivantos Pte. Ltd. Prothèse auditive avec commutation automatique à algorithme
DE102009014053A1 (de) 2009-03-19 2010-09-30 Siemens Medical Instruments Pte. Ltd. Verfahren zum Einstellen einer Richtcharakteristik und Hörvorrichtung
DE102009014053B4 (de) * 2009-03-19 2012-11-22 Siemens Medical Instruments Pte. Ltd. Verfahren zum Einstellen einer Richtcharakteristik und Hörvorrichtungen
US9763016B2 (en) 2014-07-31 2017-09-12 Starkey Laboratories, Inc. Automatic directional switching algorithm for hearing aids

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