EP1154674A3 - Circuit and method for adaptive noise suppression - Google Patents

Circuit and method for adaptive noise suppression 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
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EP
European Patent Office
Prior art keywords
filters
signals
filter coefficients
microphones
converters
Prior art date
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Granted
Application number
EP01810057A
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German (de)
French (fr)
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EP1154674A2 (en
EP1154674B1 (en
Inventor
Remo Leber
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Bernafon AG
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Bernafon AG
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Publication of EP1154674A3 publication Critical patent/EP1154674A3/en
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Publication of EP1154674B1 publication Critical patent/EP1154674B1/en
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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

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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)
  • 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.

Figure imgaf001
The adaptive noise cancellation circuit is part of a digital hearing aid consisting of two microphones (1, 2), two AD converters (3, 4), two compensation filters (5, 6), two delay elements (7, 8), two subtractors ( 9, 10), a processing unit (11), a DA converter (13), a receiver (15) and the two filters (17, 18). The method for adaptive noise suppression can be realized with the specified circuit. The two microphones (1, 2) deliver different electrical signals (d 1 (t), d 2 (t)) depending on their spatial arrangement or their directional characteristics and depending on the location of the acoustic signal sources, which in the AD converters (3, 4) and pre-processed with the two fixed compensation filters (5, 6). This is followed by the filters (17, 18) arranged symmetrically over the cross in the forward direction with the adaptive filter coefficients ( w 1 , w 2 ). The filter coefficients ( w 1 , w 2 ) are calculated using a stochastic gradient method and are updated in real time while minimizing a quadratic cost function consisting of cross-correlation terms. As a result, spectral differences of the input signals are selectively amplified. With suitable placement of the microphones (1, 2) or selection of the directional characteristics can thus the signal-to-noise ratio of output signals (s 1 , s 2 ) compared with that of the individual microphone signals (d 1 (t), d 2 (t)) be increased significantly. Preferably one of the improved output signals (s 1 , s 2 ) is subjected in one of the processing units (11, 12) to the usual hearing aid-specific processing, sent to one of the DA converters (13, 14) and transmitted via one of the receivers (15, 16). again acoustically output. In the present invention, four additional cross-link filters (19-22) perform a signal-dependent transformation of the input and output signals (y 1 , y 2 ; s 1 , s 2 ), and for updating the filter coefficients ( w 1 , w 2 ) only the transformed signals are used. This allows a fast-reacting, but still computational, updating of the filter coefficients ( w 1 , w 2 ) and, in contrast to other methods, causes only minimal audible distortions.
Figure imgaf001
EP01810057A 2000-02-02 2001-01-22 Circuit and method for adaptive noise suppression Expired - Lifetime EP1154674B1 (en)

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 (en) 2001-11-14
EP1154674A3 true EP1154674A3 (en) 2007-03-21
EP1154674B1 EP1154674B1 (en) 2008-12-10

Family

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EP01810057A Expired - Lifetime EP1154674B1 (en) 2000-02-02 2001-01-22 Circuit and method for adaptive noise suppression

Country Status (7)

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

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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
WO2001087011A2 (en) * 2000-05-10 2001-11-15 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
EP1413169A1 (en) * 2001-08-01 2004-04-28 Dashen Fan Cardioid beam with a desired null based acoustic devices, systems and methods
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 (en) * 2005-04-28 2007-09-05 北京航空航天大学 Distribution method for internal noise of receiver RF system circuit
DE102006003977A1 (en) * 2006-01-27 2007-08-09 Krauss-Maffei Wegmann Gmbh & Co. Kg Method and device for overriding a vehicle in driving school operation
US20110058676A1 (en) * 2009-09-07 2011-03-10 Qualcomm Incorporated Systems, methods, apparatus, and computer-readable media for dereverberation of multichannel signal
DK3008924T3 (en) * 2013-06-14 2018-10-01 Widex As METHOD OF SIGNAL PROCESSING IN A HEARING SYSTEM AND HEARING SYSTEM

Citations (3)

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EP0930801A2 (en) * 1998-01-14 1999-07-21 Bernafon AG Circuit and method for adaptive suppression of acoustic feedback
US5963651A (en) * 1997-01-16 1999-10-05 Digisonix, Inc. Adaptive acoustic attenuation system having distributed processing and shared state nodal architecture
SE511496C2 (en) * 1995-05-03 1999-10-11 Ulf Lindgren Mixed source signal separation method

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DE3920004A1 (en) * 1989-06-20 1991-01-03 Philips Patentverwaltung METHOD AND ARRANGEMENT FOR NOISE REDUCTION OF A DIGITAL SIGNAL
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 (en) * 1996-06-17 2002-10-15 ソニー株式会社 Noise reducer and video signal processor
CN1264507A (en) * 1997-06-18 2000-08-23 克拉里蒂有限责任公司 Methods and appartus for blind signal separation
US6691073B1 (en) * 1998-06-18 2004-02-10 Clarity Technologies Inc. Adaptive state space signal separation, discrimination and recovery
JP2001053654A (en) * 1999-08-16 2001-02-23 Matsushita Electric Ind Co Ltd Signal separating device, signal separation method and recording medium

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US20020101942A1 (en) * 1995-03-05 2002-08-01 Ulf Lindgren Signal separation
SE511496C2 (en) * 1995-05-03 1999-10-11 Ulf Lindgren Mixed source signal separation method
US5963651A (en) * 1997-01-16 1999-10-05 Digisonix, Inc. Adaptive acoustic attenuation system having distributed processing and shared state nodal architecture
EP0930801A2 (en) * 1998-01-14 1999-07-21 Bernafon AG Circuit and method for adaptive suppression of acoustic feedback

Non-Patent Citations (1)

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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 *

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

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