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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 Hearing Loss Conductive In middle or outer ear Wax, infection, foreign objects Dampens all sounds Sensorineural Lose high frequency sounds Amplification no help Sensorineural Causes Birth defect Disease Medications Loud noises Brain tumors Head trauma Aging Sensorineural Prevalence 10% of US pop. (31.5 Million) ~3 / 1,000 birth defects 65% below age 65 Examples What they hear What we hear Problem Statement High frequency hearing loss Normal human hearing range 10-20,000 Hz Speaking range Up to 10 kHz QuickTime™ and a decompressor are needed to see this picture. 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 Block Diagram Electrot Condenser Microphone TI Fixed Point DSP (TMS320VC5509) Digital to Analog Converter Preamp and speaker 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 Audio Signal Processing Method Resampling Audio Signal Processing Method Pitch Scaling (Transpose) Future Work (This semester) Build Platform Learn development kit Write code Test 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 References http://www.asha.org/public/hearing/disorders/ http://www.nidcd.nih.gov/health/statistics/hearing.asp http://www.nidcd.nih.gov/health/statistics/hearing.asp http://static.howstuffworks.com/gif/hearing-2.jpg http://hearingblog.files.wordpress.com/2007/08/hearing_aids_bigger24424_1.jpg Questions?