EP1657960B1 - Verfahren zur Ultraschalldetektion in einer Höreinrichtung sowie Höreinrichtung mit zwei oder mehr Mikrofonen - Google Patents

Verfahren zur Ultraschalldetektion in einer Höreinrichtung sowie Höreinrichtung mit zwei oder mehr Mikrofonen Download PDF

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Publication number
EP1657960B1
EP1657960B1 EP04388075.6A EP04388075A EP1657960B1 EP 1657960 B1 EP1657960 B1 EP 1657960B1 EP 04388075 A EP04388075 A EP 04388075A EP 1657960 B1 EP1657960 B1 EP 1657960B1
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EP
European Patent Office
Prior art keywords
microphones
energy
listening device
microphone
ultrasound
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.)
Not-in-force
Application number
EP04388075.6A
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English (en)
French (fr)
Other versions
EP1657960A1 (de
Inventor
Kim Spetzler Petersen
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.)
Oticon AS
Original Assignee
Oticon AS
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.)
Filing date
Publication date
Application filed by Oticon AS filed Critical Oticon AS
Priority to DK04388075T priority Critical patent/DK1657960T3/da
Priority to EP04388075.6A priority patent/EP1657960B1/de
Publication of EP1657960A1 publication Critical patent/EP1657960A1/de
Application granted granted Critical
Publication of EP1657960B1 publication Critical patent/EP1657960B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H04R25/43—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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • 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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Definitions

  • the invention concerns a method for detection of ultra sound in a listening device and a listening device with a plurality of microphones wherein means are provided for detection of the presence of ultrasound.
  • a hearing aid having plural microphones M1, M2, and M3.
  • the energy contents in each of the microphone signals from the microphones M1, M2 and M3 is determined, and the microphone signal with the lowest energy contents is selected.
  • an adaptive microphone is provided, wherein 3 microphones M1, M2 and a directional microphone M3 are provided.
  • An adaptive calculation algorithm calculates a directional signal from microphone input signals derived from microphones M1 and M2. The energy content of the calculated directional signal and the energy content of the signal derived from M3 are calculated and compared and the signal with the lowest energy content is selected as the output signal.
  • the invention concerns a method for detecting ultrasound and eliminating the harmful influence of ultra sound in a listening device having two or more microphones, whereby firstly the energy contents in the microphone signals is determined, and whereby time related changes in energy contents of the microphone signals is analysed to determine whether any of the microphones is subjected to an ultrasound sound-field, and whereby the signal from the microphone signal with the lowest content of ultrasound is routed through a signal processing device to an output unit.
  • the two microphone are often influenced quite differently by the ultra sound. Due to the very short wavelength of the ultrasound, one microphone port may be strongly influenced while the other port is hardly affected at all. This is used by the method in that the influence on the microphones of the ultrasound is monitored continuously and the signal from the microphone channel which is the least influenced by the ultra sound is routed to an output unit.
  • the signal processing device is preferably a digital signal processing device and the output unit could be a receiver or other device externally or implanted into the ear or brain for providing a sensation of sound corresponding to the audio sounds in the environment.
  • the invention also comprises a listening device with two or more microphones whereby the listening device has means for detecting the presence of ultrasound in at least one microphone channel.
  • Fig. 1 shows the device to detect the ultrasound according to the invention
  • the microphones and the A/D converters delivers the input to the system.
  • the following signal processing calculates a mean value of the energy in each microphone channel.
  • the energy of each channel is forwarded into the analyse block. This block decides if the signal picked up by the microphones is ultra sound or not.
  • the analyse block looks at the energy contents in the signal from the microphone channels, and when the energy in one or more channels rises very fast above a given limit and reaches a value close to or at the saturation limit, the signal from another microphone is routed to the hearing aid user. In this event any on-going directional- or other multi microphone algorithm must be terminated, and to this end a status value is routed from the analyse block to an overall control block of the listening device. Tests have shown that when a hearing aid or other listening device with microphones provided close to each other is moved about in an ultrasound sound field, at least one of the microphones will at most times be relatively un-affected by the ultra sound.
  • the user of the listening device to have at least one microphone functioning at most times also when the user is in a sound field of a ultrasound generator. Since the person is moving in the ultra sound field, and thereby changing the situation, the device must react fast.
  • the purpose of the device is to use the microphone with the least amount of energy, when ultra sound is detected.
  • Ad. 1 The limit value depends on the limit of saturation in a microphone. For hearing a aid microphone is this limit around 115-120 dB spl.

Landscapes

  • 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)

Claims (2)

  1. Verfahren zum Erfassen und Minimieren des schadhaften Einflusses von Ultraschall in einem Hörgerät mit zwei oder mehr Mikrophonen, wobei die Energiegehalte in den Mikrophonsignalen folgendermaßen bestimmt und wobei die zeitbezogenen Änderungen der Energiegehalte der Mikrophonsignale folgendermaßen analysiert werden:
    - Erfassen, ob die Energie in einem der Mikrophone über einem vorgegebenen Wert liegt,
    - Vergleichen der Energie von zwei Kanälen,
    und falls die Energie in dem Kanal mit höchster Energie um ein vorgegebenes Vielfaches größer als die Energie des anderen Kanals ist, wird festgelegt, dass wenigstens eines der Mikrophone einem Ultraschall Schallfeld ausgesetzt ist, und ein entsprechender Statuswert wird zu einer digitalen Signalverarbeitungseinheit gesendet, welches zur Folge hat, dass das Signal des Mikrophonsignals mit der geringsten Energiemenge durch die Signalverarbeitungseinheit zu einer Ausgabeeinheit geleitet wird.
  2. Hörgerät mit zwei oder mehr Mikrophonen, das Mittel zum Ausführen der Schritte des Verfahrens zum Erfassen und Minimieren des schadhaften Einflusses von Ultraschall in einem Hörgerät nach Anspruch 1 aufweist.
EP04388075.6A 2004-11-16 2004-11-16 Verfahren zur Ultraschalldetektion in einer Höreinrichtung sowie Höreinrichtung mit zwei oder mehr Mikrofonen Not-in-force EP1657960B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DK04388075T DK1657960T3 (da) 2004-11-16 2004-11-16 Fremgangsmåde til detektering af ultralyd i en lytteindretning med to eller flere mikrofoner, og lytteindretning med to eller flere mikrofoner
EP04388075.6A EP1657960B1 (de) 2004-11-16 2004-11-16 Verfahren zur Ultraschalldetektion in einer Höreinrichtung sowie Höreinrichtung mit zwei oder mehr Mikrofonen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04388075.6A EP1657960B1 (de) 2004-11-16 2004-11-16 Verfahren zur Ultraschalldetektion in einer Höreinrichtung sowie Höreinrichtung mit zwei oder mehr Mikrofonen

Publications (2)

Publication Number Publication Date
EP1657960A1 EP1657960A1 (de) 2006-05-17
EP1657960B1 true EP1657960B1 (de) 2013-06-26

Family

ID=34931967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04388075.6A Not-in-force EP1657960B1 (de) 2004-11-16 2004-11-16 Verfahren zur Ultraschalldetektion in einer Höreinrichtung sowie Höreinrichtung mit zwei oder mehr Mikrofonen

Country Status (2)

Country Link
EP (1) EP1657960B1 (de)
DK (1) DK1657960T3 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0989775A1 (de) * 1995-10-31 2000-03-29 Lux-Wellenhof, Gabriele Hörgerät mit Einrichtung zur Signalqualitätsüberwachung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5775100A (en) * 1980-10-28 1982-05-11 Yasuo Sato Heaing aid
JP3189555B2 (ja) 1994-02-28 2001-07-16 ソニー株式会社 マイクロホン装置
JP3279040B2 (ja) 1994-02-28 2002-04-30 ソニー株式会社 マイクロホン装置
ATE384412T1 (de) * 2003-04-28 2008-02-15 Oticon As Mikrofon, hörgerät mit einem mikrofon und einlass-struktur für ein mikrofon

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0989775A1 (de) * 1995-10-31 2000-03-29 Lux-Wellenhof, Gabriele Hörgerät mit Einrichtung zur Signalqualitätsüberwachung

Also Published As

Publication number Publication date
EP1657960A1 (de) 2006-05-17
DK1657960T3 (da) 2013-09-30

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