It’s obviously pretty complex under the hood, but boiled down, the service uses the VAMP plug-in to filter the audio and separate it into different parts. “When you transcribe chords, we examine the mixture as a whole and examine what the prominent frequencies are in the spectrum.” “The problem with ‘full polyphonic transcription’ is that the computer doesn’t know how many voices and instruments sound together and what the characteristics are of these instruments,” says De Haas. Instead of picking out every note in a piece of music, which is very difficult, Chordify looks at the big picture of songs. The web service also uses the algorithmic approach based on cofounder and computer music researcher Bas De Haas’s PhD dissertation from Utrecht University. Unlike other reverse engineering solutions, Chordify makes it as simple as pasting in a link from Deezer, SoundCloud, or YouTube, turning them into sheet music you can play along with.
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