Constant Q Transform – A Visual Guide

The Constant-Q Transform A visual, interactive guide to the frequency transform that hears music the way we do — with logarithmic resolution matching the structure of pitch. Intuition FFT vs CQT Log-Frequency Geometry The CQT Kernel Computing the CQT Chromagram Applications ▼ Chapter 1 01 The Core Intuition "Constant Q" means the ratio of each frequency bin's centre frequency to its bandwidth is constant. Low notes get wide analysis windows (good frequency resolution); high notes get narrow wind