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Sound Conversion for Hearing Loss Patients
using Texas Instruments DSP chips Advisor: Dr. Thomas Yen Jack Ho – BSAC Kuya Takami – BWIG Nathan Werbeckes – Leader Joseph Yuen – Communicator
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Hearing Loss Conductive Sensorineural In middle or outer ear
Wax, infection, foreign objects Dampens all sounds Sensorineural Lose high frequency sounds Amplification no help
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Sensorineural Causes Birth defect Disease Medications Loud noises
Brain tumors Head trauma Aging
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Sensorineural Prevalence
10% of US pop. (31.5 Million) ~3 / 1,000 birth defects 65% below age 65
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Examples What they hear What we hear
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Problem Statement High frequency hearing loss
Normal human hearing range 10-20,000 Hz Speaking range Up to 10 kHz Talk about causes too Examples of Sh, S, T, Th, P, or F sounds Picture reference: Krames Communications. (1995). Hearing Aids. [Brochure]. San Bruno, CA.
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Problem Statement Ctnd.
Texas Instruments C5509 DSP Shift/compress frequencies Using DSP to process signals in real time Frequency scan Aesthetics Fashionable Bluetooth Hands-free Device Look-alike Speak on C5509’s features: Low-power, ADC, etc. Also on TI’s grant and supplying us with their technology
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Block Diagram Electrot Condenser Microphone
TI Fixed Point DSP (TMS320VC5509) Digital to Analog Converter Preamp and speaker
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Audio Signal Processing Method
Audio timescale-pitch modification Resampling Phase Vocoder Pitch Scaling (Transpose) What we hear What our device will sound like What they would normally hear 9
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Audio Signal Processing Method
Resampling 10
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Audio Signal Processing Method
Pitch Scaling (Transpose) 11
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Future Work (This semester)
Build Platform Learn development kit Write code Test
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Future Work (later semesters)
Convert all speech sounds to hearing fovea Different modes for different environments Small enough to resemble blue tooth headset Good at sound localization Psychoacoustics
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References http://www.asha.org/public/hearing/disorders/
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Questions?
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