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Sound Conversion for Hearing Loss Patients

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Presentation on theme: "Sound Conversion for Hearing Loss Patients"— Presentation transcript:

1 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

2 Hearing Loss Conductive Sensorineural In middle or outer ear
Wax, infection, foreign objects Dampens all sounds Sensorineural Lose high frequency sounds Amplification no help

3 Sensorineural Causes Birth defect Disease Medications Loud noises
Brain tumors Head trauma Aging

4 Sensorineural Prevalence
10% of US pop. (31.5 Million) ~3 / 1,000 birth defects 65% below age 65

5 Examples What they hear What we hear

6 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.

7 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

8 Block Diagram Electrot Condenser Microphone
TI Fixed Point DSP (TMS320VC5509) Digital to Analog Converter Preamp and speaker

9 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

10 Audio Signal Processing Method
Resampling 10

11 Audio Signal Processing Method
Pitch Scaling (Transpose) 11

12 Future Work (This semester)
Build Platform Learn development kit Write code Test

13 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

14 References http://www.asha.org/public/hearing/disorders/

15 Questions?


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