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Anti-Snoring Pillow (ASP)

Anti-Snoring Pillow (ASP). For a peaceful night of sleep. December 13, 2007. LifeX Team. Raymond Lee Software Researching parts Camillia Lee Documentation Software Testing Simon Wong Theory Software Debugger Stanley Yang Software Budget. Outline. Background Objectives

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Anti-Snoring Pillow (ASP)

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  1. Anti-Snoring Pillow (ASP) For a peaceful night of sleep December 13, 2007

  2. LifeX Team • Raymond Lee • Software • Researching parts • Camillia Lee • Documentation • Software • Testing • Simon Wong • Theory • Software • Debugger • Stanley Yang • Software • Budget

  3. Outline • Background • Objectives • System Overview • High Level System Design • Business Case • Results • What was learned • Future Improvements • Conclusion

  4. Background

  5. Background “Forty-five percent of normal adults snore at least occasionally, and 25 percent are habitual snorers.” “Thirty percent of adults over age 30 are snorers. By middle age, that number reaches 40 percent.”

  6. Background… continued • A number of effects to both the snorer and those who hear him/her • daytime drowsiness, • irritability, • lack of focus, • decrease libido • psychological and social damage

  7. Current existing solutions • Surgeries, sleeping aids, dental appliances • Downfalls • Expensive • Invasive • Painful • Complications • Unreliable

  8. Objectives

  9. Objectives • Produce a affordable non-invasive solution to reduce the sound of snoring Goal: Minimize snoring noise at low frequencies by 10-15dB

  10. LifeX’s Solution The “Anti-Snoring Pillow” -A noise suppression system integrated into a pillow

  11. System Overview

  12. Types of Noise Control - Passive • Reduces noise using specialized materials • Sound isolation • Sound absorption • Vibration damping • i.e. Ear muffs

  13. Types of Noise Control - Active • Acoustic cancellation that involves a control speaker for emitting a opposite polarity sound

  14. Adaptive ANC • Adaptive ANC • Real time controller for monitoring the system’s performance • System parameters are always changing • Required for complex noise (i.e. speech, snoring, random noise, etc)

  15. Adaptive ANC • How? • Digital signal travels faster than speed of sound! • Advantages over passive acoustic control • More effective at low frequencies • Less bulky • Able to block noise selectively • A “good” system will yield better performance (up to 20+dB reduction) • Adaptive!!!

  16. System Overview • 1x Speaker (Control) • 2x Microphone (Reference & Error) • 1x DSP board • 1x Pillow

  17. System Arrangement

  18. High Level System Design

  19. Active Noise Cancellation Systems • Types of ANC system • Digital Filters • Adaptation Algorithm

  20. Types of ANC System • Two Major types • Waveform synthesis (Periodic noise – Engine noise, fan noise) • Adaptive Filtering • Feedback (No reference signal) • Feedforward (Reference signal) • Feedforward is always preferred over feedback when reference signal is available

  21. High Level System Design

  22. Feedforward System Adaptive broadband feedforward control with an acoustic input sensor

  23. Digital Filters • Finite Impulse Response (FIR) • Inherently stable • Infinite Impulse Response (IIR) • Built in feedback compensation • Less computational low • Can model complex systems • Inherently unstable

  24. Digital Filters • Three major parameters: type of system, filter weights, number of filter weights • Optimization by trial and error

  25. Adaptation Algorithm • Least Mean Square (LMS) • FXLMS • Secondary path compensation (Offline Training)

  26. Adaptation Algorithm • Filtered-U Recursive (RLMS)

  27. Business Case

  28. Market • Our target market would be towards couples sleeping on the same bed • Our anti-snoring product is unique compared to other solutions available • Benefits to our product • Non-invasive • Inexpensive • Safe • Comfortable • User friendly

  29. Cost

  30. Financing • Bank loans • Investment banking • Private investors • Angel investors

  31. Competition • High performance passive ANC foam ear plugs • Chin-up Strips • Keeps mouth closed to reduce snoring • Nasal strips • Keep nostrils opened for better breathing • Surgery • None using Active Noise Cancellation!!!

  32. Results

  33. Snoring Sample Spectrum

  34. Experimental Results – 1st Try

  35. Simplified approach…

  36. Results • Sine waves

  37. Results

  38. Budget and Timeline

  39. Proposed Timeline

  40. Actual Timeline

  41. Proposed & Actual Budget

  42. Future Improvements

  43. Future Improvements • Try more algorithms • Automatic Gain Control • Faster convergence rate for complex audio processing • Controllable pre-amplifier and output-amplifier

  44. Future Improvements – cont. • More suitable equipment • Low frequency Omni-directional microphones • Low frequency speakers • Perform testing in a controlled environment • Wideband ANC • Solution: Multi-channel System!

  45. Conclusion

  46. What was learned • Time management • Mike was wrong! “Take what you think and multiply it by 3.” • …More like by 8 • Team work • DSP • Active Noise Cancellation • Documentation • Ideas to Product

  47. Conclusion • Target more complex sounds • Automatic Gain Control • Stability • Solutions… • Multi-channel System! • Omni-directional Microphones • Low frequency speakers • More optimization!!

  48. References • [1] American Physical Therapy Association, “Physical Therapy Patient Satisfaction Questionnaire Research Grants”, 2007, http://www.apta.org//AM/Template.cfm?Section=Home • [2] Texas Instruments, “Design of Active Noise Control System with the TMS320 Family, June 1996, http://focus.ti.com/lit/an/spra042/spra042.pdf • [3] Speech Vision Robotics group , “Finite Impulse Response Filters”, http://svr-www.eng.cam.ac.uk/~ajr/SA95/node13.html • [4] TMS320C6713 DSK - Technical Reference. Stafford, TX: Spectrum Digital Inc., 2004. • [5] A DSP/BIOS AIC23 Codec Device Driver for the TMS320DM642 EVM, Texas Instrument, June 2003, http://focus.ti.com/lit/an/spra922/spra922.pdf • [6] “Sampling rate” – Wikipedia, September 2007, http://en.wikipedia.org/wiki/Sampling_rate • [7] “Understanding Active Noise Cancellation”, Colin N Hansen, 2001 • [8] "Headphones." Frontech - Best of Its Kind. 2006. 1 Nov. 2007 <http://www.frontechonline.com/headphones.html>. • [9] "X-540." Logitech. 2007. 1 Nov. 2007 <http://www.logitech.com/index.cfm/speakers_audio/home_pc_speakers/devices/234&cl=ca,en>. • [10]“Latex Pillows, Foam Pillows for Head and Neck”, AllergyBuyersClub. 2007 <http://www.allergybuyersclubshopping.com/latex-head-neck-pillows.html> • [11] “A Host Port Interface Board to Enhance the TMS320C6713 DSK” Morrow, M.G.; Welch, T.B.; Wright, C.H.G. May 2006 <http://ieeexplore.ieee.org>.

  49. Acknowledgement • Dr. Andrew Rawicz • Wighton Professor for Engineering Development, School of Engineering Science, SFU • Mr. Mike Sjoerdsma • Lecturer, School of Engineering Science, SFU • Mr. Brad Oldham • Teaching Assistant, School of Engineering Science, SFU • Ms. Lisette Paris-Shaadi • Teaching Assistant, School of Engineering Science, SFU • Dr. Lakshman One • Professor, School of Engineering Science, SFU

  50. Questions?

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