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MSD P13038 Hearing Aid Design

MSD P13038 Hearing Aid Design. System Design Review January 11, 2012. Team Members 1.11.13. Alissa Anderson Team Manager Conor Murphy System Integration Engineer Ronald Dries Lead Electrical Kelly Murosky Lead Mechanical Nanxi Yu EDGE Master Paula Garcia Secretary

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MSD P13038 Hearing Aid Design

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  1. MSD P13038 Hearing Aid Design System Design Review January 11, 2012

  2. Team Members 1.11.13 Alissa Anderson Team Manager Conor Murphy System Integration Engineer Ronald Dries Lead Electrical Kelly Murosky Lead Mechanical Nanxi Yu EDGE Master Paula Garcia Secretary Eric Lew Budget Master Marbella Vidals Customer Relations Sarah Brownell Guide

  3. Agenda 1.11.13 Project Overview (5 minutes) - Background - Motivation - Major customer needs, specs, and functions Mechanical Design (10 minutes) - Enclosure renderings - Mechanical architecture - Hot Topic: User-centered design Electrical Design (20 minutes) - Electrical architecture - Hot Topic: micro-processor selection and power distribution Software Design (15 minutes) - Software architecture - Hot Topic: System simulation and filtering methods Project Plan (10 minutes) - Critical Path - Major risk summary - Budget review

  4. Background & Motivation 1.11.13 • Expected Project Benefits: • (1) De-stigmatize hearing aids as medical devices by creating an audio accessory that is socially accepted and used by both hearing and hard of hearing individuals. • (2) Provide hard-of-hearing market with an alternative hearing aid device that offers similar features contained within a new physical form • (3) Project is to serve as an initial proof of concept for future MSD projects to focus on improvements in device adjustability and functionality • Target Audience: hearing and hard-of-hearing, young hearing aid users • Oticon, Agile

  5. Functional Decomposition 1.11.13 user input recognizes input stores input amplify sound program device adjusts system to input accepts data stores data modify function to data process sound supply power output sound interface with user accept energy capture sound accept ear store energy modify sound fits comfortably transform energy protects user filter sound output energy adjust by frequency resists water and shock track power level raise sound level controls volume manages heat

  6. Design Constraints (ME/ID) 1.11.13

  7. Benchmarking 1.11.13

  8. Enclosure Proposal 1.11.13 • Key Features: • Processes and amplifies sound based on custom user hearing profiles • Rechargeable power source • Reprogrammable software for changes in user application • Interfaces with USB 2.0 • User control of volume, power, and profile setting • Interfaces with standard ear tube and ear mold styles (custom fit, dome, etc.) • Optimized number and location of microphones for sound capture

  9. Enclosure Proposal 1.11.13 • detachable “Transfer Module”

  10. Design Constraints (EE) 1.11.13

  11. Proposed Budget 1.11.13

  12. Timeline: Critical Dates 1.11.13

  13. Risk Assessment 1.11.13

  14. Backup

  15. MatLab 1.11.13 • Code Overview: amplifies sound and reduces noise for a patient with “ski-slope” hearing loss • Frequency Shaper: • Breaks hearing loss into piecewise functions and calculates the required gain for each section • Applies Fourier Transform on the input signal, and multiplies transformed signal by the required gain function • The Inverse Fourier Transform of the signal converts signal back to the time domain. • Amplitude Shaper: • Output signal is inputted into an amplitude shaper to remove noise and confirms signal is in acceptable (not harmful) range.

  16. Types of Ear Molds 1.9.13 Oticon Intiga Hearing aid with “dome” style earmold Oticon DigiFocus II Hearing aid with “custom” style earmold Motorola HK200 Bluetooth Headset, “dome” style earmold

  17. Customer Needs 1.11.13

  18. Specifications 1.11.13

  19. System Architecture (Physical) 1.11.13 User Interface Microphone USB Battery Ear mold Ear Tube Speaker Logic Board Enclosure Dummy

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