Monophonic vs. Polyphonic Audio Transcription Explained

When exploring audio-to-MIDI tools, you will frequently see recordings classified as monophonic or polyphonic. Understanding this difference sets realistic expectations and yields better workflow decisions.

• Monophonic (One Note at a Time): Examples include solo vocals, trumpet, flute, saxophone, bass lines, and single-note guitar lines. The fundamental frequency is unambiguous, allowing autocorrelation algorithms to achieve near-perfect transcription.
• Polyphonic (Multiple Simultaneous Notes): Examples include piano chords, strummed guitar, and full orchestral mixes. Multiple fundamental frequencies and their overlapping harmonic series coexist in the same waveform, creating acoustic interference that requires harmonic clustering and post-editing.