EP2129167B1 - Procédé de fonctionnement d'un appareil auditif et système de microphone pour un appareil auditif - Google Patents

Procédé de fonctionnement d'un appareil auditif et système de microphone pour un appareil auditif Download PDF

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Publication number
EP2129167B1
EP2129167B1 EP09155477.4A EP09155477A EP2129167B1 EP 2129167 B1 EP2129167 B1 EP 2129167B1 EP 09155477 A EP09155477 A EP 09155477A EP 2129167 B1 EP2129167 B1 EP 2129167B1
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EP
European Patent Office
Prior art keywords
microphone
signal
frequency range
directional
signals
Prior art date
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Active
Application number
EP09155477.4A
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German (de)
English (en)
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EP2129167A1 (fr
Inventor
Robert BÄUML
Jens Hain
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
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Siemens Medical Instruments Pte Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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

  • the invention relates to a specified in claim 1 method for operating a hearing aid and a specified in claim 7 microphone system with at least two microphone signals emitting omnidirectional microphones.
  • Directional microphones rank among the methods of noise suppression that have been established for years and demonstrably improve speech intelligibility in listening situations in which the useful signal and the interference signals come from different directions.
  • the directivity is generated by differential processing of two or more adjacent microphones having omnidirectional characteristics.
  • Noise Reduction in Contemporary Hearing Instruments “, Chapter” Directional Microphone Systems”
  • 5th DGA Annual Conference 2002 1 st and 2 nd order differential systems as well as systems with adaptive directional characteristics are described.
  • FIG. 1 shows a simplified block diagram of a directional microphone system 1st order with two microphones 1, 2 at a distance of about 10 to 15 mm.
  • This creates an external delay of T2 between the first and the second microphone for sound signals coming from the front V, which for example corresponds to the distance of the microphones 1, 2 from each other.
  • the signal R2 of the second microphone 2 is delayed by the time T1 in the delay unit 3, inverted in the inverter 4 and added to the signal R1 of the first microphone 1 in the first adder 5.
  • the sum results in the directional microphone signal RA, which can be supplied to a listener, for example via signal processing.
  • the direction-dependent sensitivity arises essentially from a subtraction of the second microphone signal R2 delayed by the time T2 from the first signal R1.
  • Sound signals from the front V are thus, after appropriate equalization, not attenuated, while, for example, sound signals are extinguished from behind S.
  • Structure and mode of action of directional microphone systems for hearing aids are, for example, in the patent DE 103 31 956 B3 described.
  • the document US Pat. No. 6,178,248 A shows a method for operating a hearing aid with at least two omnidirectional microphones emitting microphones, the microphones are electrically interconnected to form a directional characteristic. For faster processing of broadband input signals, these are separated into a lower and a higher band. An adaptive filter is applied in the lower subband while a non-adaptive filter in the upper subband is used.
  • the document W097 40645 A shows a hearing aid microphone with directional characteristics, in which the microphone signals are split into frequency bands and different amplification factors in the different frequency bands are used.
  • the usable frequency range to be processed by the hearing aids also increases. Due to shadowing and reflections of the sound waves at the head of the hearing aid wearer, the directional effect of known directional microphones drops sharply, so that acoustically broadband interference signals, which should actually be extinguished by the directional microphone, are suppressed only in the lower frequency range. As a result, the interference signal sounds very high-pass. This effect affects the subjective perception of the hearing aid wearer or the quality of the directional microphone.
  • the stated object is achieved by the method of independent claim 1 and the microphone system of independent claim 7.
  • a method for operating a hearing device with at least two omnidirectional microphones is specified.
  • the microphones emit microphone signals and are electrically interconnected to form a directional characteristic. From the lower frequency range of the microphone signals an attenuation for the upper frequency range of the microphone signals is determined. This has the advantage that broadband interference signals are effectively attenuated.
  • the interconnected microphones can emit a signal with directivity and the attenuation can be determined from a comparison of the signal with directivity and the lower frequency range of a microphone signal. As a result, a directivity is achieved even at high frequencies.
  • the upper frequency range of a microphone signal can be applied to the attenuation. Furthermore, the attenuated upper frequency range of a microphone signal can be added to the signal with directivity. This creates the impression of a broadband directional microphone.
  • the upper frequency range of a combination of the microphone signals can be subjected to the attenuation.
  • the attenuated upper frequency range of the combination of the microphone signals can be added to the undamped signal with directivity. This can lead to improved results in specific environmental situations.
  • the upper frequency range of the signal with directional characteristic can be applied to the attenuation and the attenuated upper frequency range of the signal with directional characteristic are added to the undamped signal with directional characteristic.
  • the invention also provides a microphone system for a hearing aid with at least a first and a second omnidirectional microphone.
  • the microphones emit microphone signals.
  • the microphone system comprises at least a first means which separates the microphone signals into upper and lower frequency ranges, at least a second means which forms a microphone signal with directional characteristics from the lower frequency ranges of the microphone signals, a third means which comprises a comparison of the lower frequency range of the microphone signal of the first microphone with the microphone signal with directional characteristic determines a signal attenuation, and a fourth means which attenuates the upper frequency range of the microphone signal of the first microphone with the detected signal attenuation.
  • the first means may comprise a crossover
  • the second means a directional microphone unit
  • the third means an attenuation estimation module and / or the fourth means an adjustable attenuator.
  • the microphone system may additionally comprise a fifth means which adds the attenuated upper frequency range of the microphone signal of the first microphone and the microphone signal with directional characteristic.
  • the fifth means may comprise an adder.
  • the invention also provides a hearing aid with a microphone system according to the invention.
  • FIG. 2 shows a schematic diagram of a hearing aid with a directional microphone system according to the invention.
  • the microphone system comprises two omnidirectional microphones 1, 2.
  • the microphone signals R1, R2 emanating from the microphones 1, 2 are respectively divided into a frequency divider 6 into upper and lower frequency ranges RH1, RL1, RH2, RL2.
  • the upper frequency range RH1 of the first microphone signal R1 is fed to a controllable attenuator 9.
  • the lower frequency range RL2 of the second microphone signal R2 originating from the crossover 6 is delayed by the time T1 in a delay unit 3, inverted by an inverter 4 and added in a first adder 5 to the lower frequency range RL1 of the first microphone signal R1.
  • the delay unit 3, the inverter 4 and the first adder 5 together form the directional microphone unit 7.
  • the upper frequency range RH2 of the second microphone signal R2 is discarded.
  • a signal RA with directional characteristics leaves the directional microphone unit 7 and is supplied to an input of a damping estimation unit 8.
  • the lower frequency range RL1 of the first microphone signal R1 is supplied to a further input of the attenuation estimation unit 8.
  • an attenuation D is determined in the attenuation estimation unit 8.
  • an attenuation signal D leaves the estimation unit 8 and is supplied to an input of the controllable attenuator 9.
  • the upper frequency range RH1 of the first microphone signal R1 is attenuated.
  • the attenuated in accordance with the attenuation signal D upper frequency range RHD of the first microphone signal R1 leaves over an output the attenuator 9 and is supplied to an input of a second adder 10.
  • Another input of the second adder 10, the signal RA is supplied with directional characteristics.
  • the two signals RHD, RH are summed in the second adder 10.
  • a sum signal HS leaves the second adder 10 via an output.
  • the sum signal HS is fed to a receiver 11 either directly or via a digital signal processing unit, not shown.
  • the arrangement according to the invention causes the broadband frequency range recorded by microphones to be separated into a lower and an upper range.
  • the differential directional microphone works, while in the upper area the estimated attenuation is applied.
  • the estimated attenuation is estimated from a comparison of the omnidirectional signal and the signal processed by the directional microphone and possibly modified.
  • the estimated attenuation is applied in the upper frequency range to create the impression of a broadband directional microphone.
  • the estimated attenuation which should act at high frequencies, is largely derived from the power ratio directional / omnidirectional.
  • expert knowledge can also be incorporated via a corresponding characteristic curve. To avoid artifacts, the estimated attenuation can be further modified.
  • the high frequencies hardly contribute to the speech intelligibility and can be differentiated by a hearing aid user also bad, the subjective impression arises that the directional microphone would work also in the high frequencies.
  • This effect is particularly noticeable with a pure useful signal from the front and a pure interference signal from behind. In the case of the useful signal, the signal becomes full Volume is reproduced, but the pure interference signal is attenuated over the entire frequency range.

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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)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Claims (11)

  1. Procédé de fonctionnement d'un appareil auditif comportant au moins deux microphones omnidirectionnels (1, 2) émettant des signaux de microphone (R1, R2), dans lequel les microphones (1, 2) sont câblés électriquement l'un à l'autre pour former une caractéristique directionnelle,
    caractérisé en ce
    qu'une atténuation (D) de la gamme de fréquences supérieure (RH1, RH2) des signaux de microphone (R1, R2) est déterminée à partir de la gamme de fréquences inférieure (RL1, RL2) des signaux de microphone (R1, R2).
  2. Procédé selon la revendication 1,
    caractérisé en ce
    que les microphones câblés (1, 2) émettent un signal (RA) ayant une caractéristique directionnelle et en ce que l'atténuation (D) est déterminée à partir d'une comparaison du signal (RA) ayant une caractéristique directionnelle et de la gamme de fréquences inférieure (RL1) d'un signal de microphone (R1).
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce
    que l'atténuation (D) est appliquée à la gamme de fréquences supérieure (RH1) d'un signal de microphone (R1).
  4. Procédé selon la revendication 3,
    caractérisé en ce
    que la gamme de fréquences supérieure atténuée (RHD) d'un signal de microphone (R1) est ajoutée au signal (RA) ayant une caractéristique directionnelle.
  5. Procédé selon la revendication 1 ou 2,
    caractérisé en ce
    que l'atténuation (D) est appliquée à la gamme de fréquences supérieure (RH1) d'une combinaison des signaux de microphone (R1, R2).
  6. Procédé selon la revendication 5,
    caractérisé en ce
    que la gamme de fréquences supérieure atténuée de la combinaison des signaux de microphone est ajoutée au signal non atténué (RA) ayant une caractéristique directionnelle.
  7. Système de microphones pour un appareil auditif comportant au moins un premier et un deuxième microphone omnidirectionnel (1, 2) émettant des signaux de microphone (R1, R2),
    au moins un premier moyen (6) qui sépare les signaux de microphone (R1, R2) en gammes de fréquences supérieure et inférieure (RH1, RH2, RL1, RL2),
    au moins un deuxième moyen (7) qui forme à partir des gammes de fréquences inférieures (RL1, RL2) des signaux de microphone (R1, R2) un signal de microphone (RA) ayant une caractéristique directionnelle, caractérisé par un troisième moyen (8) qui détermine une atténuation de signal (D) à partir d'une comparaison de la gamme de fréquences inférieure (RL1) du signal de microphone (R1) du premier microphone (1) avec le signal de microphone (RA) ayant une caractéristique directionnelle, et
    un quatrième moyen (9) qui atténue la gamme de fréquences supérieure (RH1) du signal de microphone (R1) du premier microphone (1) avec l'atténuation de signal (D) déterminée.
  8. Système de microphones selon la revendication 7,
    caractérisé en ce
    que le premier moyen (6) comprend un circuit diviseur de fréquence, le deuxième moyen (7) comprend une unité de microphone directionnel, le troisième moyen (8) comprend un module d'estimation d'atténuation et/ou le quatrième moyen (9) comprend un atténuateur ajustable.
  9. Système de microphones selon la revendication 7 ou 8,
    caractérisé par
    un cinquième moyen (10) qui ajoute la gamme de fréquence supérieure atténuée (RHD) du signal de microphone (R1) du premier microphone (1) et le signal de microphone (RA) ayant une caractéristique directionnelle.
  10. Système de microphones selon la revendication 9,
    caractérisé en ce
    que le cinquième moyen (10) comprend un deuxième additionneur.
  11. Appareil auditif comportant un système de microphones selon l'une des revendications 7 à 10.
EP09155477.4A 2008-05-07 2009-03-18 Procédé de fonctionnement d'un appareil auditif et système de microphone pour un appareil auditif Active EP2129167B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008022533A DE102008022533B3 (de) 2008-05-07 2008-05-07 Verfahren zum Betrieb eines Hörgeräts und Mikrofonsystem für ein Hörgerät

Publications (2)

Publication Number Publication Date
EP2129167A1 EP2129167A1 (fr) 2009-12-02
EP2129167B1 true EP2129167B1 (fr) 2013-11-13

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EP09155477.4A Active EP2129167B1 (fr) 2008-05-07 2009-03-18 Procédé de fonctionnement d'un appareil auditif et système de microphone pour un appareil auditif

Country Status (4)

Country Link
US (1) US8275162B2 (fr)
EP (1) EP2129167B1 (fr)
DE (1) DE102008022533B3 (fr)
DK (1) DK2129167T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8638951B2 (en) * 2010-07-15 2014-01-28 Motorola Mobility Llc Electronic apparatus for generating modified wideband audio signals based on two or more wideband microphone signals
US10366702B2 (en) 2017-02-08 2019-07-30 Logitech Europe, S.A. Direction detection device for acquiring and processing audible input
US10362393B2 (en) 2017-02-08 2019-07-23 Logitech Europe, S.A. Direction detection device for acquiring and processing audible input
US10366700B2 (en) 2017-02-08 2019-07-30 Logitech Europe, S.A. Device for acquiring and processing audible input
US11277689B2 (en) 2020-02-24 2022-03-15 Logitech Europe S.A. Apparatus and method for optimizing sound quality of a generated audible signal

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Also Published As

Publication number Publication date
US8275162B2 (en) 2012-09-25
DK2129167T3 (da) 2014-02-10
US20090279724A1 (en) 2009-11-12
DE102008022533B3 (de) 2009-10-08
EP2129167A1 (fr) 2009-12-02

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