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Comprehensive Design Review

Comprehensive Design Review. Team Vibraid March 2014. Vibraid. Michael Balanov (Mike) EE. Spyridon Baltsavias (Spiros) EE. Reona Otsuka (Leo) EE . Andrew Woo (Andy) EE. Previous Block Diagram. 4. 4. 8. 4. 4. 4. variable resistance. variable resistance. s witch signal.

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Comprehensive Design Review

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  1. Comprehensive Design Review Team Vibraid March 2014

  2. Vibraid Michael Balanov (Mike) EE SpyridonBaltsavias (Spiros) EE Reona Otsuka (Leo) EE Andrew Woo (Andy) EE

  3. Previous Block Diagram 4 4 8 4 4 4 variable resistance variable resistance switch signal

  4. Revised Block Diagram 4 4 4 4 4 4 variable resistance variable resistance switch signal

  5. Demo Outline 4 way directionality amplitude comparison Microphone inputs, processing and output functioning correctly. Filter not yet integrated but functional

  6. FPR Goal - Revised Requirements • How to meet spec? • Amplitude comparison algorithm modifications • Time delay estimation between input sound signals

  7. Determining Time delay Use cross-correlation of pair of signals Find argmax, corresponding to delay (in samples) between signals

  8. FPR Goal - Revised Requirements • Sampling frequency? • 10kHz ADC on Arduino • 4 inputs -> 10k/4 = 2.5kHz each • 1.25kHz maximum signal • Important sound frequencies • Baby cry: 300 – 440 Hz • Car Horn: 400 – 500 Hz • Alarms and sirens: 1 - 3 kHz

  9. FPR Goal - Revised Requirements

  10. Q&A

  11. CDR Deliverables • Goal: Demonstrate 4-way detection and vibration directionality • Correct quadrant determination • Meet range, frequency specs • Implement working user interface • Prototype filter • Implement levels of motor activation • Portable power supply

  12. Pros and Cons of Design • Pros • Intuitive polar representation • Horizontal orientation • Adjustable • Cons • User may need to tuck in their shirt • Hand/clothing obstruction

  13. Sprectrum of potential sound sources Baby cry: 300 – 440 Hz Car Horn: 400 – 500 Hz Alarms and sirens: 1 - 3 kHz https://www.google.com/search?q=frequency+range+of+alarams&oq=frequency+range+of+alarams&aqs=chrome..69i57.5644j0j1&sourceid=chrome&espv=210&es_sm=122&ie=UTF-8#q=frequency+range+of+alarms http://en.wikipedia.org/wiki/Vehicle_horn http://www.livescience.com/38298-cry-analyzer-could-indicate-babies-health.html

  14. D d

  15. Gantt chart

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