WO1999014985A1 - Appareil auditif a gain eleve de type 'cic' resistant a la retroaction - Google Patents

Appareil auditif a gain eleve de type 'cic' resistant a la retroaction Download PDF

Info

Publication number
WO1999014985A1
WO1999014985A1 PCT/US1998/019237 US9819237W WO9914985A1 WO 1999014985 A1 WO1999014985 A1 WO 1999014985A1 US 9819237 W US9819237 W US 9819237W WO 9914985 A1 WO9914985 A1 WO 9914985A1
Authority
WO
WIPO (PCT)
Prior art keywords
hearing aid
feedback
microphone
accelerometers
acceleration
Prior art date
Application number
PCT/US1998/019237
Other languages
English (en)
Inventor
Oleg Saltykov
Original Assignee
Siemens Hearing Instruments, Inc.
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 Siemens Hearing Instruments, Inc. filed Critical Siemens Hearing Instruments, Inc.
Publication of WO1999014985A1 publication Critical patent/WO1999014985A1/fr

Links

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
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically
    • 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
    • H04R25/502—Customised settings for obtaining desired overall acoustical characteristics using analog signal processing

Definitions

  • the invention relates to hearing aids, and more particularly relates to high-gain hearing aids. In its most immediate sense, the invention relates to high-gain CIC hearing aids that are resistant to feedback.
  • CIC aids have definite acoustic advantages for patients that can use them. However, there is a limit to the acoustic gain that such aids can produce. When the acoustic gain exceeds 40-45 dB, feedback makes the aid unstable. This is because a CIC aid is very compact and the microphone and receiver are consequently well coupled through the hearing aid housing.
  • one object of the invention is to provide a high-gain, feedback-resistant hearing aid, particularly of the CIC type. Another object is, in general, to improve on known hearing aids.
  • a hearing aid is provided with at least one accelerometer and a feedback processor.
  • the accelerometer is physically attached to a part of the hearing aid, and produces an acceleration signal representing the acceleration of that part.
  • the feedback processor processes the audio signal from the microphone in accordance with the audio signal and the acceleration signal. As the acceleration signal increases, this indicates that feedback is beginning to occur. Such similarity can then be used to e.g. reduce the audio gain or filter the audio signal to prevent feedback from becoming audible.
  • At least two accelerometers of which one is attached to the microphone and the other is
  • SUBSTITUTE SHEET (RULE 26) coupled to the microphone through the housing, and such similarity can also be used to modify the way in which the audio signal is processed.
  • a Completely-In-Canal (“CIC") hearing aid housing 2 supports a receiver 4 that is ported to the outside through an opening 6.
  • the housing 2 is closed off at its end remote from the opening 6 by a faceplate 8.
  • a microphone 10 is supported by the faceplate 8 and is ported to the outside through an opening 12.
  • a faceplate accelerometer 14 is physically attached to the faceplate 8 and a microphone accelerometer 16 is physically attached to the microphone 10.
  • a feedback processor 18 is operatively connected with the microphone 10, the faceplate accelerometer 16 and the microphone accelerometer 18; to the microphone 10 via an amplifier 20, to the faceplate accelerometer 14 via an amplifier 22, and to the microphone accelerometer 16 via an amplifier 24.
  • the receiver 4 is operatively connected with the feedback processor 18 via a power amplifier 26.
  • the operation of the feedback processor 18 is programmed using a digital controller 28 (which contains a PROM) .
  • the digital controller 28 is programmed from the outside via a connector 30 that is mounted in the faceplate 8. Part of the programming of the digital controller 28 includes information relating to the patient's prescription; the feedback processor 18 is thereby programmed to process the audio signal from the microphone 10 in such a manner as to compensate for the patient's hearing impairment.
  • the feedback processor 18 performs another function in addition to patient-specific signal processing. This additional function is to detect feedback before it becomes audible. When the acoustic gain of a CIC aid exceeds 40-45 dB, feedback is liable to occur. This is because a CIC aid is very small and the microphone 10 and receiver 4 can therefore be well coupled through the housing 2 and the faceplate 8.
  • the accelerometers 14 and 16 are used to determine the degree of coupling between the microphone 10 and the receiver 4. Vibrations from the receiver 4 are transmitted through the housing 2 to the faceplate 8 and generate sound pressure near the microphone opening 12. This sound pressure is a source of feedback and is proportional to acceleration of the faceplate 8. Another source of feedback is vibration of the microphone 10, which vibration is mechanically transmitted to the microphone 10 and which causes the microphone 10 to generate a signal proportional to its acceleration. Accelerometers 14 and 16 generate acceleration signals that are proportional, respectively, to acceleration of the faceplate 8 and acceleration of the microphone 10.
  • the feedback processor 18 modifies the processing of the audio signal from the microphone 10 in such a manner as to eliminate the feedback or at least limit it to an inaudible level. Such modification can take the form of gain adjustment, filtering, phase-shifting, and mixing with other signals (e.g. the signals from one or more of the accelerometers 14 and 16) . While the use of two accelerometers 14 and 16, and the attachment of these accelerometers to the faceplate 8 and microphone 10 are presently preferred, they are not required. One accelerometer may be sufficient or more may be found advantageous, and the accelerometer (s) need not necessarily be attached to the faceplate 8 or to the microphone 10. Persons skilled in the art will be able, using reasonable experimentation with the particular hearing aid design in use, to determine how many accelerometers are required and where they should be attached.

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)

Abstract

Selon cette invention, on fixe au moins un accéléromètre, et de préférence deux (14, 16), sur certaines parties d'un appareil auditif qui est, si possible, un appareil de type 'CIC' ('complètement intra-canal'). Les accéléromètres sont connectés de manière fonctionnelle à un processeur de rétroaction (18). Lorsque les signaux de sortie provenant des accéléromètres indiquent un effet de rétroaction, le processeur de rétroaction traite le signal audio provenant du microphone (10) pour éliminer la rétroaction ou au moins la maintenir à un niveau inaudible.
PCT/US1998/019237 1997-09-17 1998-09-15 Appareil auditif a gain eleve de type 'cic' resistant a la retroaction WO1999014985A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US93234597A 1997-09-17 1997-09-17
US08/932,345 1997-09-17

Publications (1)

Publication Number Publication Date
WO1999014985A1 true WO1999014985A1 (fr) 1999-03-25

Family

ID=25462180

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/019237 WO1999014985A1 (fr) 1997-09-17 1998-09-15 Appareil auditif a gain eleve de type 'cic' resistant a la retroaction

Country Status (1)

Country Link
WO (1) WO1999014985A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018210974A1 (fr) 2017-05-16 2018-11-22 Gn Hearing A/S Procédé de détermination de la distance entre les oreilles d'un utilisateur portant un objet de génération de son et objet de génération de son porté par l'oreille

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201006A (en) * 1989-08-22 1993-04-06 Oticon A/S Hearing aid with feedback compensation
GB2311186A (en) * 1996-03-13 1997-09-17 Jan Albert Gadd Hearing aid feedback detecting and warning device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201006A (en) * 1989-08-22 1993-04-06 Oticon A/S Hearing aid with feedback compensation
GB2311186A (en) * 1996-03-13 1997-09-17 Jan Albert Gadd Hearing aid feedback detecting and warning device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VEIT I: "Technische Akustik: Grundlagen der physikalischen, physiologischen und Elektroakustik", VOGEL, 1996, XP002088009 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018210974A1 (fr) 2017-05-16 2018-11-22 Gn Hearing A/S Procédé de détermination de la distance entre les oreilles d'un utilisateur portant un objet de génération de son et objet de génération de son porté par l'oreille
US10911886B2 (en) * 2017-05-16 2021-02-02 Gn Hearing A/S Method for determining distance between ears of a wearer of a sound generating object and an ear-worn, sound generating object
US11330390B2 (en) 2017-05-16 2022-05-10 Gn Hearing A/S Method for determining distance between ears of a wearer of a sound generating object and an ear-worn, sound generating object

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