Musikalische Frequenzanalyse

This is a youth experimenting project from Saxony-Anhalt:
Music is in the air - but how can we measure it?
I explored this in my student experiment work by developing an app that recognizes music notes. I used the MIT App Inventor programming environment for this. I informed myself about the connection between frequencies and tones and tried out the behavior of the frequency measurement on many different instruments with a specially developed test app. I learned that the frequencies of the tones could be calculated using a formula, and used this to program an algorithm for tone recognition. My finished app measures frequencies and calculates the name of the musical note and can save melodies. For example, with my app it is possible to learn instruments where the tones cannot be clearly assigned without prior knowledge, such as playing a harmonica.