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Sound include noises. Filters can be done for noises programmatically. The A/D conversion is also done in the embedded system.

Source of Interface electronic circuits:

https://moodle.metropolia.fi/pluginfile.php/310151/mod_resource/content/3/Sensor%20Technology%20presentation.pdf

http://www.ti.com/lit/ds/symlink/opa344.pdf

https://www.sparkfun.com/datasheets/BreakoutBoards/Mic-Testing-v10.zip 

Material and manufacturing

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