How do you Shazam stuff? It’s spectrogram magic. From Audio Melody:
Basically it works like this. The database stores song data about the song’s unique sounds and patterns. Then the app listens to the music, creating an audio fingerprint based on a few seconds of the track. This data is the checked against the database, which matches it to your recording.
This begins with a spectrogram, essentially a graph that has time on the x-axis and frequencies on the y-axis, and amplitude is represented by color. Any sequence of sound can be converted into a spectrogram and there can be an assigned set of coordinates attached to it at any time. Notes turn into numbers. Looking through a database of millions of songs using a detailed spectrogram, there too many data points to look through at any speed.
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