EP1154674A3 - Schaltung und Verfahren zur adaptiven Geräuschunterdrückung - Google Patents

Schaltung und Verfahren zur adaptiven Geräuschunterdrückung Download PDF

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Publication number
EP1154674A3
EP1154674A3 EP01810057A EP01810057A EP1154674A3 EP 1154674 A3 EP1154674 A3 EP 1154674A3 EP 01810057 A EP01810057 A EP 01810057A EP 01810057 A EP01810057 A EP 01810057A EP 1154674 A3 EP1154674 A3 EP 1154674A3
Authority
EP
European Patent Office
Prior art keywords
filters
signals
filter coefficients
microphones
converters
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.)
Granted
Application number
EP01810057A
Other languages
English (en)
French (fr)
Other versions
EP1154674A2 (de
EP1154674B1 (de
Inventor
Remo Leber
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.)
Bernafon AG
Original Assignee
Bernafon AG
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Filing date
Publication date
Application filed by Bernafon AG filed Critical Bernafon AG
Publication of EP1154674A2 publication Critical patent/EP1154674A2/de
Publication of EP1154674A3 publication Critical patent/EP1154674A3/de
Application granted granted Critical
Publication of EP1154674B1 publication Critical patent/EP1154674B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing

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)
  • Filters That Use Time-Delay Elements (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Noise Elimination (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

Die Schaltung zur adaptiven Geräuschunterdrückung ist Bestandteil eines digitalen Hörgeräts, bestehend aus zwei Mikrophonen (1, 2), zwei AD-Wandlern (3, 4), zwei Kompensationsfiltern (5, 6), zwei Verzögerungselementen (7, 8), zwei Subtrahierern (9, 10), einer Verarbeitungseinheit (11), einem DA-Wandler (13), einem Hörer (15) sowie den zwei Filtern (17, 18). Das Verfahren zur adaptiven Geräuschunterdrückung kann mit der angegebenen Schaltung realisiert werden. Die beiden Mikrophone (1, 2) liefern abhängig von ihrer räumlichen Anordnung oder ihrer Richtcharakteristik und abhängig vom Ort der akustischen Signalquellen unterschiedliche elektrische Signale (d1(t), d2(t)), die in den AD-Wandlern (3, 4) digitalisiert und mit den beiden fixen Kompensationsfiltern (5, 6) vorverarbeitet werden. Anschliessend folgen die symmetrisch übers Kreuz in Vorwärtsrichtung angeordneten Filter (17, 18) mit den adaptiven Filterkoeffizienten (w 1, w 2). Die Filterkoeffizienten (w 1, w 2) werden mit einem stochastischen Gradientenverfahren berechnet und in Echtzeit aufdatiert unter Minimierung einer aus Kreuzkorrelationstermen bestehenden quadratischen Kostenfunktion. Dadurch werden spektrale Unterschiede der Eingangssignale selektiv verstärkt. Bei geeigneter Platzierung der Mikrophone (1, 2) oder Auswahl der Richtungscharakteristiken kann somit das Signal-Rausch-Verhältnis von Ausgangssignalen (s1, s2) verglichen mit demjenigen der einzelnen Mikrophonsignale (d1(t), d2(t)) wesentlich erhöht werden. Vorzugsweise eines der verbesserten Ausgangssignale (s1, s2) wird in einer der Verarbeitungseinheiten (11, 12) der üblichen hörgerätespezifischen Verarbeitung unterzogen, zu einem der DA-Wandler (13, 14) geschickt und über einen der Hörer (15, 16) wieder akustisch ausgegeben. Bei der vorliegenden Erfindung nehmen vier zusätzliche Kreuzglied-Filter (19-22) eine signalabhängige Transformation der Ein- und Ausgangssignale (y1, y2; s1, s2) vor, und zur Aufdatierung der Filterkoeffizienten (w 1, w 2) werden nur die transformierten Signale verwendet. Dies ermöglicht eine schnell reagierende und trotzdem recheneffiziente Aufdatierung der Filterkoeffizienten (w 1, w 2) und verursacht im Gegensatz zu anderen Verfahren nur minimale hörbare Verzerrungen.
EP01810057A 2000-02-02 2001-01-22 Schaltung und Verfahren zur adaptiven Geräuschunterdrückung Expired - Lifetime EP1154674B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2042000 2000-02-02
CH2042000 2000-02-02

Publications (3)

Publication Number Publication Date
EP1154674A2 EP1154674A2 (de) 2001-11-14
EP1154674A3 true EP1154674A3 (de) 2007-03-21
EP1154674B1 EP1154674B1 (de) 2008-12-10

Family

ID=4444028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01810057A Expired - Lifetime EP1154674B1 (de) 2000-02-02 2001-01-22 Schaltung und Verfahren zur adaptiven Geräuschunterdrückung

Country Status (7)

Country Link
US (1) US6928171B2 (de)
EP (1) EP1154674B1 (de)
AT (1) ATE417483T1 (de)
AU (1) AU778351B2 (de)
CA (1) CA2332092C (de)
DE (1) DE50114557D1 (de)
DK (1) DK1154674T3 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6978159B2 (en) * 1996-06-19 2005-12-20 Board Of Trustees Of The University Of Illinois Binaural signal processing using multiple acoustic sensors and digital filtering
CA2407855C (en) * 2000-05-10 2010-02-02 The Board Of Trustees Of The University Of Illinois Interference suppression techniques
US6907017B2 (en) * 2000-05-22 2005-06-14 The Regents Of The University Of California Mobility management in wireless internet protocol networks
KR20040028933A (ko) * 2001-08-01 2004-04-03 다센 판 기대했던 소리의 널의 카디오이드 빔에 기초한 소리장치,시스템 및 방법
US7209566B2 (en) * 2001-09-25 2007-04-24 Intel Corporation Method and apparatus for determining a nonlinear response function for a loudspeaker
US7542580B2 (en) * 2005-02-25 2009-06-02 Starkey Laboratories, Inc. Microphone placement in hearing assistance devices to provide controlled directivity
US20060211910A1 (en) * 2005-03-18 2006-09-21 Patrik Westerkull Microphone system for bone anchored bone conduction hearing aids
CN100336307C (zh) * 2005-04-28 2007-09-05 北京航空航天大学 接收机射频系统电路内部噪声的分配方法
DE102006003977A1 (de) * 2006-01-27 2007-08-09 Krauss-Maffei Wegmann Gmbh & Co. Kg Verfahren und Vorrichtung zur Übersteuerung bei einem Fahrzeug im Fahrschulbetrieb
US20110058676A1 (en) * 2009-09-07 2011-03-10 Qualcomm Incorporated Systems, methods, apparatus, and computer-readable media for dereverberation of multichannel signal
WO2014198332A1 (en) * 2013-06-14 2014-12-18 Widex A/S Method of signal processing in a hearing aid system and a hearing aid system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0930801A2 (de) * 1998-01-14 1999-07-21 Bernafon AG Schaltung und Verfahren zur adaptiven Unterdrückung einer akustischen Rückkopplung
US5963651A (en) * 1997-01-16 1999-10-05 Digisonix, Inc. Adaptive acoustic attenuation system having distributed processing and shared state nodal architecture
SE511496C2 (sv) * 1995-05-03 1999-10-11 Ulf Lindgren Förfarande vid signalseparation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920004A1 (de) * 1989-06-20 1991-01-03 Philips Patentverwaltung Verfahren und anordnung zur rauschunterdrueckung eines digitalen signals
US5235646A (en) * 1990-06-15 1993-08-10 Wilde Martin D Method and apparatus for creating de-correlated audio output signals and audio recordings made thereby
US5590205A (en) * 1994-08-25 1996-12-31 Digisonix, Inc. Adaptive control system with a corrected-phase filtered error update
JP3334500B2 (ja) * 1996-06-17 2002-10-15 ソニー株式会社 ノイズリデューサおよびビデオ信号処理装置
WO1998058450A1 (en) * 1997-06-18 1998-12-23 Clarity, L.L.C. Methods and apparatus for blind signal separation
US6691073B1 (en) * 1998-06-18 2004-02-10 Clarity Technologies Inc. Adaptive state space signal separation, discrimination and recovery
JP2001053654A (ja) * 1999-08-16 2001-02-23 Matsushita Electric Ind Co Ltd 信号分離装置、信号分離方法及び記録媒体

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020101942A1 (en) * 1995-03-05 2002-08-01 Ulf Lindgren Signal separation
SE511496C2 (sv) * 1995-05-03 1999-10-11 Ulf Lindgren Förfarande vid signalseparation
US5963651A (en) * 1997-01-16 1999-10-05 Digisonix, Inc. Adaptive acoustic attenuation system having distributed processing and shared state nodal architecture
EP0930801A2 (de) * 1998-01-14 1999-07-21 Bernafon AG Schaltung und Verfahren zur adaptiven Unterdrückung einer akustischen Rückkopplung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SAHLIN H ET AL: "Separation of real-world signals", SIGNAL PROCESSING, ELSEVIER SCIENCE PUBLISHERS B.V. AMSTERDAM, NL, vol. 64, no. 1, January 1998 (1998-01-01), pages 103 - 113, XP004108828, ISSN: 0165-1684 *

Also Published As

Publication number Publication date
CA2332092A1 (en) 2001-08-02
DK1154674T3 (da) 2009-04-06
EP1154674A2 (de) 2001-11-14
AU778351B2 (en) 2004-12-02
US20010036284A1 (en) 2001-11-01
ATE417483T1 (de) 2008-12-15
EP1154674B1 (de) 2008-12-10
AU1666901A (en) 2001-08-09
CA2332092C (en) 2008-09-30
US6928171B2 (en) 2005-08-09
DE50114557D1 (de) 2009-01-22

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