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IntroductionandOverview ALinux-basedHearingAid Conclusions Application of Linux Audio in Hearing Aid Research Giso Grimm1 Tobias Herzke2 Volker Hohmann2 1Universit¨atOldenburg,Oldenburg,Germany 2H¨orTechgGmbH,Oldenburg,Germany Linux Audio Conference, April 17th, 2009. GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview ALinux-basedHearingAid Conclusions Introduction and Overview Hearing Aids Algorithms for Digital Hearing Aids Evaluation of Hearing Aids A Linux-based Hearing Aid RT performance CPU and battery performance Delay Constraints Conclusions GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch Digital hearing aids (cid:73) First hearing aid with Digital Signal Processing in 1996 (cid:73) New algorithms with no analogue counterpart (cid:73) Wireless binaural link between ears (cid:73) Parameter exchange (cid:73) Coming soon: Low-delay low-power audio transmission IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Hearing Aids Analogue hearing aids (cid:73) Limited capabilities: (cid:73) Frequency shaping and amplification (cid:73) Dynamic compression (cid:73) Static notch filters for feedback cancellation GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Hearing Aids Analogue hearing aids (cid:73) Limited capabilities: (cid:73) Frequency shaping and amplification (cid:73) Dynamic compression (cid:73) Static notch filters for feedback cancellation Digital hearing aids (cid:73) First hearing aid with Digital Signal Processing in 1996 (cid:73) New algorithms with no analogue counterpart (cid:73) Wireless binaural link between ears (cid:73) Parameter exchange (cid:73) Coming soon: Low-delay low-power audio transmission GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Limitations of hearing aids Device (cid:73) Small battery capacity (cid:73) Low processing power Acoustics (cid:73) Acoustic feedback (cid:73) Limited audio bandwidth (by tube between receiver and ear) End user (cid:73) High expenses (cid:73) Unfulfilled expectations GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Algorithms scalable to individual hearing loss (cid:73) Dynamic compression (cid:73) Frequency shaping (cid:73) Frequency compression Signal enhancement (cid:73) Directional microphones (cid:73) Noise reduction Artifact reduction (cid:73) Feedback cancellation (cid:73) Future: Non-linearity compensation, ... GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Why dynamic compression? 140 120 100 L P B S 80 el / d 60 (cid:73) Normal hearing ev threshold l 40 20 ISO normal HTL 0 50 100 200 500 1k 2k 5k 10k frequency / Hz GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Why dynamic compression? 140 120 100 L B SP 80 (cid:73) Hearing impaired d typical impaired HTL threshold el / 60 ev (cid:73) Amplification and l 40 frequency shaping 20 0 50 100 200 500 1k 2k 5k 10k frequency / Hz GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Why dynamic compression? 140 120 normal UCL 100 L P B S 80 el / d 60 (cid:73) Normal ev uncomfortable level l 40 20 0 50 100 200 500 1k 2k 5k 10k frequency / Hz GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Why dynamic compression? 140 120 100 L typical impaired UCL P B S 80 (cid:73) Hearing impaired d el / 60 uncomfortable level v e l 40 (cid:73) Dynamic compression 20 0 50 100 200 500 1k 2k 5k 10k frequency / Hz GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch

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LAC 2009 - Slides: Application of Linux Audio in Hearing Aid Research PDF

2009·2 MB·English
by  Giso Grimm, Tobias Herzke, Volker Hohmann
#computersandtechvideos #linux-audio-conference
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IntroductionandOverview ALinux-basedHearingAid Conclusions Application of Linux Audio in Hearing Aid Research Giso Grimm1 Tobias Herzke2 Volker Hohmann2 1Universit¨atOldenburg,Oldenburg,Germany 2H¨orTechgGmbH,Oldenburg,Germany Linux Audio Conference, April 17th, 2009. GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview ALinux-basedHearingAid Conclusions Introduction and Overview Hearing Aids Algorithms for Digital Hearing Aids Evaluation of Hearing Aids A Linux-based Hearing Aid RT performance CPU and battery performance Delay Constraints Conclusions GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch Digital hearing aids (cid:73) First hearing aid with Digital Signal Processing in 1996 (cid:73) New algorithms with no analogue counterpart (cid:73) Wireless binaural link between ears (cid:73) Parameter exchange (cid:73) Coming soon: Low-delay low-power audio transmission IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Hearing Aids Analogue hearing aids (cid:73) Limited capabilities: (cid:73) Frequency shaping and amplification (cid:73) Dynamic compression (cid:73) Static notch filters for feedback cancellation GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Hearing Aids Analogue hearing aids (cid:73) Limited capabilities: (cid:73) Frequency shaping and amplification (cid:73) Dynamic compression (cid:73) Static notch filters for feedback cancellation Digital hearing aids (cid:73) First hearing aid with Digital Signal Processing in 1996 (cid:73) New algorithms with no analogue counterpart (cid:73) Wireless binaural link between ears (cid:73) Parameter exchange (cid:73) Coming soon: Low-delay low-power audio transmission GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Limitations of hearing aids Device (cid:73) Small battery capacity (cid:73) Low processing power Acoustics (cid:73) Acoustic feedback (cid:73) Limited audio bandwidth (by tube between receiver and ear) End user (cid:73) High expenses (cid:73) Unfulfilled expectations GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Algorithms scalable to individual hearing loss (cid:73) Dynamic compression (cid:73) Frequency shaping (cid:73) Frequency compression Signal enhancement (cid:73) Directional microphones (cid:73) Noise reduction Artifact reduction (cid:73) Feedback cancellation (cid:73) Future: Non-linearity compensation, ... GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Why dynamic compression? 140 120 100 L P B S 80 el / d 60 (cid:73) Normal hearing ev threshold l 40 20 ISO normal HTL 0 50 100 200 500 1k 2k 5k 10k frequency / Hz GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Why dynamic compression? 140 120 100 L B SP 80 (cid:73) Hearing impaired d typical impaired HTL threshold el / 60 ev (cid:73) Amplification and l 40 frequency shaping 20 0 50 100 200 500 1k 2k 5k 10k frequency / Hz GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Why dynamic compression? 140 120 normal UCL 100 L P B S 80 el / d 60 (cid:73) Normal ev uncomfortable level l 40 20 0 50 100 200 500 1k 2k 5k 10k frequency / Hz GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch IntroductionandOverview HearingAids ALinux-basedHearingAid AlgorithmsforDigitalHearingAids Conclusions EvaluationofHearingAids Why dynamic compression? 140 120 100 L typical impaired UCL P B S 80 (cid:73) Hearing impaired d el / 60 uncomfortable level v e l 40 (cid:73) Dynamic compression 20 0 50 100 200 500 1k 2k 5k 10k frequency / Hz GisoGrimm,TobiasHerzke,VolkerHohmann ApplicationofLinuxAudioinHearingAidResearch

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