acoustic cryptanalysis keypress of 9 digit keypad by sound recognize and translate to numbers

keypress of 9 digit keypad by sound recognize and translate to numbers, i dont know how to put in words what i need but i will try,

i have a device this can be an android app here are some links that are a little bit like my idea but much harder. [login to view URL] . [login to view URL]

i take the device i press learning mode i press number 1 of metal keypad the device microphone analyze sound this can be tone but also the not hearable frequency of the sound ,each every keypad makesou as you press and the metal against metal a different sound not hearable for us but the device can recognize differences in frequency and nows in learning mode this is number 1 i continue till 9 and 0. after saving learning of keypad

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Numer ID Projektu: #5152551

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