final project search and rescue
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/1.jpg)
Final Project
Search and Rescue
![Page 2: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/2.jpg)
ObjectiveAs 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.
![Page 3: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/3.jpg)
BRAINSTORMING
How can we locate a sound source?????
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Microphone
![Page 5: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/5.jpg)
Microphone
![Page 6: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/6.jpg)
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)
![Page 7: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/7.jpg)
Gain Amplfier
![Page 8: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/8.jpg)
TLC2272
![Page 9: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/9.jpg)
CD4066
![Page 10: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/10.jpg)
CD4066
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74HC4051
![Page 12: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/12.jpg)
Bandpass Filter
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Transfer Characteristic
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Design Equations
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Absolute Value
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Path Difference
d
l2
l0l1
Sound Source
Left Mic Right Mic
If l0 >> d,l = d * sin()
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Phase Delay
If c = speed of sound = 340 m/s, then t = l / c.
= arc_sin{(c * t) / d}
So, how can I measure t????
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Phase Comparison
Vphase = Vdd * (t / T)
So t = Vphase * T / Vdd
![Page 19: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/19.jpg)
TLC3702
![Page 20: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/20.jpg)
Tone Decoder IC
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LM567
![Page 22: Final Project Search and Rescue](https://reader031.vdocuments.mx/reader031/viewer/2022013004/56815fd3550346895dced23e/html5/thumbnails/22.jpg)
The sky is the limit!