WO2001022775A3 - Subband acoustic feedback cancellation in hearing aids - Google Patents

Subband acoustic feedback cancellation in hearing aids Download PDF

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Publication number
WO2001022775A3
WO2001022775A3 PCT/US2000/024230 US0024230W WO0122775A3 WO 2001022775 A3 WO2001022775 A3 WO 2001022775A3 US 0024230 W US0024230 W US 0024230W WO 0122775 A3 WO0122775 A3 WO 0122775A3
Authority
WO
WIPO (PCT)
Prior art keywords
filter
subband
training
feedback path
feedback cancellation
Prior art date
Application number
PCT/US2000/024230
Other languages
French (fr)
Other versions
WO2001022775A2 (en
Inventor
Xiaoling Fang
Gerald Wilson
Brad Giles
Original Assignee
Sonic Innovations 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23579689&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2001022775(A3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sonic Innovations Inc filed Critical Sonic Innovations Inc
Priority to DK00959832T priority Critical patent/DK1214866T3/en
Priority to JP2001526006A priority patent/JP2003529968A/en
Priority to EP00959832A priority patent/EP1214866B1/en
Priority to DE60004539T priority patent/DE60004539T2/en
Publication of WO2001022775A2 publication Critical patent/WO2001022775A2/en
Publication of WO2001022775A3 publication Critical patent/WO2001022775A3/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
    • H04R25/45—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
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/03—Synergistic effects of band splitting and sub-band 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
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing

Abstract

A new subband feedback cancellation scheme is proposed, capable of providing additional stable gain without introducing audible artifacts. The subband feedback cancellation scheme employs a cascade of two narrow-band filters Ai(Z)and Bi(Z)ng with a fixed delay, instead of a single filter Wi(Z)and a delay to represent the feedback path in each subband. The first filter, Ai(Z), is called the training filter, and models the static portion of the feedback path in ith subband, including microphone, receiver, ear canal resonance, and other relatively static parameters. The training filter can be implemented as a FIR filter or as an IIR filter. The second filter, B¿I?(Z), is called a tracking filter and is typically implemented as a FIR filter with fewer taps than the training filter. This second filter tracks the variations of the feedback path in the i?th¿ subband caused by jaw movement or objects close to the ears of the user.
PCT/US2000/024230 1999-09-20 2000-08-31 Subband acoustic feedback cancellation in hearing aids WO2001022775A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DK00959832T DK1214866T3 (en) 1999-09-21 2000-08-31 Acoustic sub-band feedback inhibition in hearing aids
JP2001526006A JP2003529968A (en) 1999-09-20 2000-08-31 Subband acoustic feedback cancellation in hearing aids
EP00959832A EP1214866B1 (en) 1999-09-20 2000-08-31 Subband acoustic feedback cancellation in hearing aids
DE60004539T DE60004539T2 (en) 1999-09-20 2000-08-31 SUBBAND SUPPRESSION OF ACOUSTIC FEEDBACK IN HEARING AID

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/399,483 1999-09-20
US09/399,483 US6480610B1 (en) 1999-09-21 1999-09-21 Subband acoustic feedback cancellation in hearing aids

Publications (2)

Publication Number Publication Date
WO2001022775A2 WO2001022775A2 (en) 2001-03-29
WO2001022775A3 true WO2001022775A3 (en) 2001-12-06

Family

ID=23579689

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/024230 WO2001022775A2 (en) 1999-09-20 2000-08-31 Subband acoustic feedback cancellation in hearing aids

Country Status (7)

Country Link
US (3) US6480610B1 (en)
EP (1) EP1214866B1 (en)
JP (1) JP2003529968A (en)
CN (1) CN1184855C (en)
DE (1) DE60004539T2 (en)
DK (1) DK1214866T3 (en)
WO (1) WO2001022775A2 (en)

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