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MSD P13038 Hearing Aid Design

MSD P13038 Hearing Aid Design. Detailed Design Review February 8, 2012. Team Members 2.1.13. 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 Detailed Design Review February 8, 2012

  2. Team Members 2.1.13 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 2.1.13 Project Overview (5 minutes) - Welcome Mechanical Design Review (30 minutes) - Enclosure review (function, assembly) - Assembly Review - Hot Topic: Assembly Feedback Electrical Design (40 minutes) - Electrical Feasibility - Circuit Schematic Review - Printed Circuit Board (PCB) Review - Hot Topic: Schematic Review Software Design (40 minutes) - Software Flowchart Review - Programming In Circuit - Processing Algorithm - Hot Topic: Programming in Circuit Project Plan (5 minutes) - Critical Path - Budget review

  4. Mechanical

  5. Functional Decomposition (ME) 1.11.13 Key Needs: (2) Fits most adult ears ages 15-25 years (3) Device does not draw negative attention (4) Device supports an active lifestyle (7) Device is rechargeable by computer USB 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 interface with user output sound accept energy capture sound accept ear store energy fits comfortably modify sound 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. Product Concept 1.2.13 battery enclosure round enclosure transfer module Interface with standard ear tube and ear molds

  7. Round Enclosure (No Transfer Module) 2.1.13 outlet for wires to BTE enclosure holes for microphone sound capture pin to interface with transfer module for stability 5 way button up = volume up down = volume down right = profile up left = profile down in = power on/off micro USB opening - to interface with transfer module pin to interface with transfer module for stability

  8. CAD Proto 1- Rotation Feature 2.1.13 Outer blue “ring” rotates about the main enclosure allowing user to hide the micro-USB hole. Rotation is controlled by grey wire stem. Top Closed Front Closed Top Open Front Open Proto 2 Changes: (1) Update microphone hole locations (2) Improve ring assembly

  9. How to attach Transfer Module 2.1.13 stability pins (1) rotate blue ring down (3) add transfer module. module will be secured by female micro USB (not shown) and stability pins (2) expose micro usb port (4) wear and enjoy!

  10. Battery Enclosure 2.1.13 micro USB (power charging) wires to round enclosure Proto 2 Changes: (1) Battery Clips (2) PCB Standoffs Batteries slide out of enclosure when they need to be replaced

  11. Proto-2 Change List 2.6.13 Planned Changes as of February 7, 2012 (1) add PCB standoffs to bottom round enclosure and battery case (2) add standoff location for 5-way switch (3) increase size of transfer module and improve transfer module / enclosure interface (4) update tube interface and solidify ear mold attachment plan (5) Add battery clips H C A F G B E D

  12. User Renderings 1.2.13

  13. Material Selection 2.6.13 Sabic’s Cycolac acrylonitrile-butadiene-styrene (ABS) thermoplastic resin Grade MG94 Superior flow, injection molding ABS Good impact resistance Best for thin-wall applications Medical biocompatibility Gamma and ethylene oxide (EtO) sterilization properties FDA and ISO 10993 compliant Chemical resistance Flame-retardancy that meets regulatory and safety standards Handles temperatures up to 110 C Broad range of colors

  14. Material Properties 2.6.13

  15. Test Plans (ME) 1 of 2 2.1.13

  16. Test Plans (ME) 2 of 2 2.1.13

  17. Key Risks (ME) 2.1.13

  18. EE

  19. Functional Decomposition (EE) 1.11.13 Key Needs: (1) Device amplifies sound (7) Device charges via USB port 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

  20. Round PCB (EE/CE) 2.1.13

  21. Battery Layout (EE/CE) 2.1.13

  22. MSD 1 Unit Test Plans (EE/CE) 2.1.13

  23. MSD 1 Unit Test Plans (EE/CE) 2.1.13

  24. Round Circuit Schematic 2.1.13

  25. Round PCB Schematic 2.1.13

  26. Battery Circuit Schematic 2.1.13

  27. Back PCB with Planes Shown 2.1.13

  28. Back PCB without Planes Shown 2.1.13

  29. Top Layer of Back Piece PCB 2.1.13

  30. Bottom Layer of Back Piece PCB 2.1.13

  31. Key Risks (EE) 2.1.13

  32. CE

  33. Functional Decomposition 1.11.13 Key Needs: (1) Device amplifies sound (7) Device charges via USB port user input recognizes input stores input program device amplify sound 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

  34. Mode Change / Standby Flow Chart (CE) 2.6.13

  35. Volume Flow Chart (CE) 2.6.13

  36. Sound Modification Flowchart (CE) 2.6.13

  37. Programming in Circuit (CE) 2.6.13 Programming Options JTAG/ONCE connector SCI (Serial Communication Interface) i2C Major issue is how to program the DSC in the circuit (on the PCB) Possible Solutions Detachable JTAG connector USB to SCI RS232 to SCI JTAG/ONCE also allows for debugging of DSC as well as programming USB or RS232 to SCI requires additional hardware that will need to be built in a separate box. JTAG/ONCE connects to USB port of computer then to the hearing aid.

  38. Processing Algorithm (CE) 2.6.13 Basic idea behind amplifying sound for this project is to : - Collect samples of human speech - Take the Fourier transform of the samples once a predetermined number has been reached - Walk through samples in the frequency domain and multiply by the gain - Take the inverse Fourier transform of the modified data to bring it back to the time domain - Output result through the DAC to the speaker Sample code from Freescale to perfom an FFT on values in an ADC buffer res = dfr16RFFT(pRFFT, (FRAC16 *) &AdcBuffer[AdcReadIndex], (dfr16_sInplaceCRFFT *) &FFTInplaceBuf[0]); The sample code takes in a signal performs the FFT and outputs the highest frequency to the terminal.

  39. MSD 1 Unit Test Plans (EE/CE) 2.1.13

  40. MSD 1 Unit Test Plans (EE/CE) 2.1.13

  41. MSD 2 Product Test Plans (EE/CE) 2.1.13

  42. Proposed Budget 1.11.13

  43. Timeline: Critical Dates 2.1.13

  44. Updated Team Risks 2.1.13

  45. Backup

  46. 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.

  47. 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

  48. Customer Needs 1.11.13

  49. Specifications 1.11.13

  50. Proto 2 Change List 2.1.13

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