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Final Project Search and Rescue

Final Project Search and Rescue. Objective. As part of the search and rescue contest, you will need to find a high frequency (4 – 6 kHz) sound located somewhere in the room. There will be low frequency (< 500 Hz) sound source in the room, also. . BRAINSTORMING.

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Final Project Search and Rescue

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  1. Final ProjectSearch and Rescue

  2. Objective As part of the search and rescue contest, you will need to find a high frequency (4 – 6 kHz) sound located somewhere in the room. There will be low frequency (< 500 Hz) sound source in the room, also.

  3. BRAINSTORMING How can we locate a sound source?????

  4. Microphone

  5. Microphone

  6. Sound Pressure Levels Sound pressure levels are measured in Pascals (Pa). If someone is yelling at you from 2-3 feet away that is about 1 Pa i.e. (1 Volt out of microphone) If he is speaking in a normal voice, that would be about 0.1 Pa. (100 mV out of microphone) If he is whispering (very softly) that might be 1 mPa. (1 mV out of microphone)

  7. Gain Amplfier

  8. TLC2272

  9. CD4066

  10. CD4066

  11. 74HC4051

  12. Bandpass Filter

  13. Transfer Characteristic

  14. Design Equations

  15. Absolute Value

  16. Path Difference Sound Source If l0 >> d, Dl = d * sin(f) l2 l0 l1 f Left Mic Right Mic d

  17. Phase Delay • If c = speed of sound = 340 m/s, then Dt = Dl / c. • = arc_sin{(c * Dt) / d} So, how can I measure Dt????

  18. Phase Comparison Vphase = Vdd * (Dt / T) So Dt = Vphase * T / Vdd

  19. TLC3702

  20. Tone Decoder IC

  21. LM567

  22. The sky is the limit!

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