IP Library › Granted Patent US 12,452,611
Granted Patent B2
US 12,452,611 · App. 18/491,847 · Granted Oct 21, 2025

Feedback cancellation in a hearing aid device using tap coherence values

Inventor: Yehonatan Hertzberg (Shoham, IL)
Assignee: Nuance Hearing Ltd.
H04R25/453H04R25/60
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Quick Facts
Patent No.
US 12,452,611
App. No.
18/491,847
Granted
Oct 21, 2025
Kind
B2
Abstract

A system for hearing assistance includes one or more microphones, a speaker and processing circuitry. The one or more microphones are configured to be mounted in proximity to a head of a subject and to output electrical signals in response to acoustic waves that are incident on the microphones. The speaker is configured for mounting in proximity to an ear of the subject. The processing circuitry is configured to amplify and filter the electrical signals so as to generate a drive signal for input to the speaker using a digital filter having multiple taps with respective tap coefficients selected to suppress feedback from the speaker to the microphones, and to compute the tap coefficients adaptively while estimating respective coherence values of the tap coefficients over time and weighting updates applied to the tap coefficients responsively to the respective coherence values.

Claims (18)

1. A system for hearing assistance, comprising:

one or more microphones, which are configured to be mounted in proximity to a head of a subject and to output electrical signals in response to acoustic waves that are incident on the microphones;

a speaker, which is configured for proximity to an ear of the subject; and

processing circuitry, which is configured to amplify and filter the electrical signals so as to generate a drive signal for input to the speaker using a digital filter having multiple taps with respective tap coefficients selected to suppress feedback from the speaker to the microphones, and which is configured to compute the tap coefficients adaptively while estimating respective coherence values of the tap coefficients over time and weighting updates applied the tap coefficients responsively to the respective coherence values,

wherein, to compute the tap coefficients adaptively, the processing circuitry is configured to adapt the tap coefficients using a gradient descent method having respective convergence factors, and to calculate the convergence factors by multiplying a common convergence factor by the respective coherence values.

2. The system according to claim 1 , wherein the processing circuitry is configured to adapt the tap coefficients so as to estimate a transfer function between the speaker and one or more of the microphones.

3. The system according to claim 1 , wherein the processing circuitry is configured to evaluate a coherence value for a given tap based on multiple coefficient updates calculated for the given tap over a specified time period.

4. The system according to claim 1 , and comprising a spectacle frame, wherein the microphones and the speaker are mounted at respective locations on the spectacle frame.

5. The system according to claim 1 , wherein the one or more microphones comprise multiple microphones, and wherein the processing circuitry is configured to apply a beamforming function to the electrical signals output by the multiple microphones so as to emphasize selected sounds that originate within a selected angular range while suppressing background sounds originating outside the selected angular range.

6. A method for hearing assistance, comprising:

mounting in proximity to a head of a subject an array of microphones, which output electrical signals in response to acoustic waves that are incident on the microphones;

mounting a speaker in proximity to an ear of the subject; and

amplifying and filtering the electrical signals so as to generate a drive signal for input to the speaker using a digital filter having multiple taps with respective tap coefficients selected to suppress feedback from the speaker to the microphones, and computing the tap coefficients adaptively while estimating respective coherence values of the tap coefficients over time and weighting updates applied to the tap coefficients responsively to the respective coherence values,

wherein computing the tap coefficients comprises adapting the tap coefficients using a gradient descent method having respective convergence factors, and wherein calculating the convergence factors comprises multiplying a common convergence factor by the respective coherence values.

7. The method according to claim 6 , wherein computing the tap coefficients comprises adapting the tap coefficients so as to estimate a transfer function between the speaker and one or more of the microphones.

8. The method according to claim 6 , and comprising evaluating a coherence value for a given tap based on multiple coefficient updates calculated for the given tap over a specified time period.

9. The method according to claim 6 , wherein the microphones and the speaker are mounted at respective locations on a spectacle frame.

10. The method according to claim 6 , wherein the one or more microphones comprise multiple microphones, and comprising applying a beamforming function to the electrical signals output by the multiple microphones so as to emphasize selected sounds that originate within a selected angular range while suppressing background sounds originating outside the selected angular range.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 23, 2023
From: HERTZBERG, YEHONATAN
To: NUANCE HEARING LTD.
Reel/Frame 065304/0551 →
Continuity (1)
Related Publication 20250133355A1 · Apr 24, 2025
References Cited (144)
US 3119903A · Rosemond et al. · 1964 [cited by applicant]
US 4904078A · Gorike · 1990 [cited by applicant]
US 5263089A · Ribic · 1993 [cited by applicant]
US 5793875A · Lehr et al. · 1998 [cited by applicant]
US 6289327B1 · Woodsum et al. · 2001 [cited by applicant]
US 6434539B1 · Woodsum et al. · 2002 [cited by applicant]
US 7031483B2 · Boone et al. · 2006 [cited by applicant]
US 7092690B2 · Zancewicz · 2006 [cited by applicant]
US 7099486B2 · Julstrom et al. · 2006 [cited by applicant]
US 7103192B2 · Bailey · 2006 [cited by applicant]
US 7369669B2 · Hagen et al. · 2008 [cited by applicant]
US 7369671B2 · Sacha · 2008 [cited by applicant]
US 7542580B2 · Burns · 2009 [cited by applicant]
US 7609842B2 · Sipkema et al. · 2009 [cited by applicant]
US 7735996B2 · Van Der Zwan et al. · 2010 [cited by applicant]
US 7809149B2 · Burns · 2010 [cited by applicant]
US 7822217B2 · Hagen et al. · 2010 [cited by applicant]
US 8116493B2 · Westermann · 2012 [cited by applicant]
US 8139801B2 · Sipkema et al. · 2012 [cited by applicant]
US 8494193B2 · Zhang et al. · 2013 [cited by applicant]
US 8611554B2 · Short et al. · 2013 [cited by applicant]
US 8744101B1 · Burns · 2014 [cited by applicant]
US 9113245B2 · Gelhard · 2015 [cited by applicant]
US 9282392B2 · Ushakov · 2016 [cited by applicant]
US 9288589B2 · Cheung · 2016 [cited by applicant]
US 9392381B1 · Park et al. · 2016 [cited by applicant]
US 9591410B2 · Short et al. · 2017 [cited by applicant]
US 9635474B2 · Kuster · 2017 [cited by applicant]
US 9641942B2 · Strelcyk et al. · 2017 [cited by applicant]
US 9734822B1 · Sundaram et al. · 2017 [cited by applicant]
US 9753311B2 · Fan · 2017 [cited by applicant]
US 9763016B2 · Merks et al. · 2017 [cited by applicant]
US 9781523B2 · Kuster et al. · 2017 [cited by applicant]
US 9810925B2 · Fan · 2017 [cited by applicant]
US 9812116B2 · Ushakov · 2017 [cited by applicant]
US 9832576B2 · Jensen et al. · 2017 [cited by applicant]
US 9980054B2 · McCracken · 2018 [cited by applicant]
US 10056091B2 · Orescanin et al. · 2018 [cited by applicant]
US 10102850B1 · Basye et al. · 2018 [cited by applicant]
US 10225670B2 · Feilner et al. · 2019 [cited by applicant]
US 10231065B2 · Udesen · 2019 [cited by applicant]
US 10353221B1 · Graff et al. · 2019 [cited by applicant]
US 10379386B2 · Fan · 2019 [cited by applicant]
US D865040S · Schaal et al. · 2019 [cited by applicant]
US D874008S · Kotzer et al. · 2020 [cited by applicant]
US 10567888B2 · Hertzberg et al. · 2020 [cited by applicant]
US 10582295B1 · Zhong et al. · 2020 [cited by applicant]
US 10721572B2 · Petersen et al. · 2020 [cited by applicant]
US 10805739B2 · Sjursen · 2020 [cited by applicant]
US 10820121B2 · Lunner et al. · 2020 [cited by applicant]
US 11259127B2 · De Haan et al. · 2022 [cited by applicant]
US 11363389B2 · Pedersen et al. · 2022 [cited by applicant]
US 11510019B2 · Rohde et al. · 2022 [cited by applicant]
US 11521633B2 · Liu · 2022 [cited by applicant]
US 20040076301A1 · Algazi et al. · 2004 [cited by applicant]
US 20040252845A1 · Tashev · 2004 [cited by applicant]
US 20060013416A1 · Truong et al. · 2006 [cited by applicant]
US 20070038442A1 · Visser et al. · 2007 [cited by applicant]
US 20080192968A1 · Ho et al. · 2008 [cited by applicant]
US 20090296044A1 · Howell et al. · 2009 [cited by applicant]
US 20090323973A1 · Dyba · 2009 [cited by applicant]
US 20110091057A1 · Derkx et al. · 2011 [cited by applicant]
US 20110293129A1 · Dillen et al. · 2011 [cited by applicant]
US 20120128175A1 · Msser et al. · 2012 [cited by applicant]
US 20120215519A1 · Park et al. · 2012 [cited by applicant]
US 20120224715A1 · Kikkeri · 2012 [cited by applicant]
US 20140093091A1 · Dusan et al. · 2014 [cited by applicant]
US 20140093093A1 · Dusan et al. · 2014 [cited by applicant]
US 20140270316A1 · Kopina et al. · 2014 [cited by applicant]
US 20150036856A1 · Pruthi et al. · 2015 [cited by applicant]
US 20150049892A1 · Petersen et al. · 2015 [cited by applicant]
US 20150201271A1 · Diethorn et al. · 2015 [cited by applicant]
US 20150230026A1 · Eichfeld et al. · 2015 [cited by applicant]
US 20150289064A1 · Jensen et al. · 2015 [cited by applicant]
US 20160111113A1 · Cho et al. · 2016 [cited by applicant]
US 20170272867A1 · Zisapel et al. · 2017 [cited by applicant]
US 20180146285A1 · Benattar et al. · 2018 [cited by applicant]
US 20180270565A1 · Ganeshkumar · 2018 [cited by applicant]
US 20180330747A1 · Ebenezer · 2018 [cited by applicant]
US 20180350379A1 · Wung et al. · 2018 [cited by applicant]
US 20180359294A1 · Brown et al. · 2018 [cited by applicant]
US 20190104370A1 · Zisapel et al. · 2019 [cited by applicant]
US 20190373355A1 · Lee et al. · 2019 [cited by applicant]
US 20190394576A1 · Petersen · 2019 [cited by examiner]
US 20190394586A1 · Pedersen et al. · 2019 [cited by applicant]
US 20200005770A1 · Lunner et al. · 2020 [cited by applicant]
US 20210345047A1 · Sabin et al. · 2021 [cited by applicant]
US 20220201403A1 · Khaleghimeybodi et al. · 2022 [cited by applicant]
US 20230336926A1 · Hertzberg et al. · 2023 [cited by applicant]
CA 2297344A1 · 2000 [cited by applicant]
CN 205608327U · 2016 [cited by applicant]
CN 106157965A · 2016 [cited by applicant]
CN 206115061U · 2017 [cited by applicant]
CN 206920741U · 2018 [cited by applicant]
CN 207037261U · 2018 [cited by applicant]
CN 208314369U · 2019 [cited by applicant]
CN 208351162U · 2019 [cited by applicant]
CN 209693024U · 2019 [cited by applicant]
CN 209803482U · 2019 [cited by applicant]
EP 4093055A1 · 2022 [cited by applicant]
ES 1213304U · 2018 [cited by applicant]
KR 20130054898A · 2013 [cited by applicant]
KR 101786613B1 · 2017 [cited by applicant]
KR 102006414B1 · 2019 [cited by applicant]
WO 9960822A1 · 1999 [cited by applicant]
WO 2004016037A1 · 2004 [cited by applicant]
WO 2013169618A1 · 2013 [cited by applicant]
WO 2017129239A1 · 2017 [cited by applicant]
WO 2017158507A1 · 2017 [cited by applicant]
WO 2017171137A1 · 2017 [cited by applicant]
WO 2018127298A1 · 2018 [cited by applicant]
WO 2018127412A1 · 2018 [cited by applicant]
WO 2018234628A1 · 2018 [cited by applicant]
WO 2021014344A1 · 2021 [cited by applicant]
WO 2022133086A1 · 2022 [cited by applicant]
International Application # PCT/IB2024/058971 Search Report dated Jan. 20, 2025. [cited by applicant]
International Application # PCT/IB2024/058969 Search Report dated Jan. 23, 2025. [cited by applicant]
CN Application # 202080050547.6 Office Action dated Mar. 27, 2025. [cited by applicant]
EP Application # 20877167.5 Search Report dated Dec. 4, 2023. [cited by applicant]
Pauline et al., “Variable tap-length non-parametric variable step-size NLMS adaptive filtering algorithm for acoustic echo cancellation,” Applied Acoustics, Elsevier, vol. 159, pp. 1-10, Feb. 2020. [cited by applicant]
Spriet et al., “Feedback control in hearing aids,” Springer Handbook of Speech Processing and Speech Communication (Chapter 48, Part H.—Speech Enhancement; Benesty et al., eds.), Springer, pp. 1-29, year 2007. [cited by applicant]
Hoydal, “A New Own Voice Processing System for Optimizing Communication,” The Hearing Review, pp. 1-8, Nov. 2017, as downloaded from https://hearingreview.com/practice-building/marketing/new-voice-processing-system-opti… [cited by applicant]
Wikipedia, “Least Mean Squares Filter,” pp. 1-6, last edited Jul. 23, 2019. [cited by applicant]
Camacho et al., “Phase Coherence Imaging: Principles, applications and current developments,” POMA—Proceedings of Meetings on Acoustics, 2019 International Congress on Ultrasonics, Signal Processing in Acoustics: PSP (2… [cited by applicant]
Hertzberg, U.S. Appl. No. 18/476,369, filed Sep. 28, 2023. [cited by applicant]
Chen et al., “Novel Radiation Pattern by Genetic Algorithms in Wireless Communication,” Proceedings of the IEEE VTS 53rd Vehicular Technology Conference, pp. 8-12, year 2001. [cited by applicant]
Mitchell, “An Introduction to Genetic Algorithms,” MIT Press, pp. 1-162, year 1998. [cited by applicant]
Haupt, “An Introduction to Genetic Algorithms for Electromagnetics,” IEEE Antennas and Propagation Magazine, vol. 37, No. 2, pp. 7-15, Apr. 1995. [cited by applicant]
Elbir et al., “Twenty-Five Years of Advances in Beamforming: From Convex and Nonconvex Optimization to Learning Techniques,” IEEE Signal Processing Magazine, vol. 40, No. 4, pp. 118-131, Jun. 2023. [cited by applicant]
Alkaher et al., “Temporal Howling Detector for Speech Reinforcement Systems,” MDPI, Acoustics, vol. 4, pp. 967-995, year 2022. [cited by applicant]
Van Waterschoot, “Fifty Years of Acoustic Feedback Control: State of the Art and Future Challenges,” Proceedings of the IEEE, vol. 99, No. 2, pp. 288-327, Feb. 2011. [cited by applicant]
U.S. Appl. No. 17/766,736 Office Action dated Jan. 11, 2024. [cited by applicant]
Widrow et al., “Microphone Arrays for Hearing Aids: An Overview”, Speech Communication, vol. 39, pp. 139-146, year 2003. [cited by applicant]
Bose Hearphones™, “Hear Better”, pp. 1-3, Feb. 19, 2017. [cited by applicant]
Veen et al., “Beamforming Techniques for Spatial Filtering”, CRC Press, pp. 1-23, year 1999. [cited by applicant]
“ICE40 Series MobileFPGA Family,” Product Information, Lattice Semiconductor, Santa Clara, Calif., pp. 1-2, last updated May 13, 2021, as downloaded from https://www.mouser.co.il/new/lattice-semiconductor/lattice-ice40-… [cited by applicant]
Choi et al., “Blind Source Separation and Independent Component Analysis: A Review,” Neural Information Processing—Letters and Review, vol. 6, No. 1, pp. 1-57, year 2005. [cited by applicant]
Mukai et al., “Real-Time Blind Source Separation and DOA Estimation Using Small 3-D Microphone Array,” Proceedings of the International Workshop on Acoustic Echo and Noise Control (IWAENC), pp. 45-48, year 2005. [cited by applicant]
Huang et al., “Real-Time Passive Source Localization: A Practical Linear-Correction Least-Squares Approach,” IEEE Transactions on Speech and Audio Processing, vol. 9, No. 8, pp. 943-956, year 2001. [cited by applicant]
Sawada et al., “Direction of Arrival Estimation for Multiple Source Signals Using Independent Component Analysis,” IEEE Proceedings of the Seventh International Symposium on Signal Processing and its Applications, vol. … [cited by applicant]
Adavanne et al., “Direction of Arrival Estimation for Multiple Sound Sources Using Convolutional Recurrent Neural Network,” 26th European Signal Processing Conference (EUSIPCO), IEEE, pp. 1462-1466, year 2018. [cited by applicant]
Byrne et al., “An International Comparison of Long-Term Average Speech Spectra,” The Journal of the Acoustical Society of America, vol. 96, No. 4, pp. 2108-2120, year 1994. [cited by applicant]
Wikipedia, “Direction of Arrival,” pp. 1-2, last edited Nov. 15, 2020. [cited by applicant]
Dibiase, “A High-Accuracy, Low-Latency Technique for Talker Localization in Reverberant Environments Using Microphone Arrays,” Doctoral Thesis, Division of Engineering, Brown University, Providence, Rhode Island, pp. 1-… [cited by applicant]