Spectrum Analyzer
FFT decomposition on a logarithmic frequency axis
The Fourier transform decomposes any signal into its frequency components. Feed the analyzer an internal oscillator (sine, square, triangle, sawtooth) or your microphone and observe the spectrum and its peaks in real time.
Audio plays when you press Start. Select microphone to analyze ambient sound (permission required).
The FFT decomposes the signal into frequency bins. Purple lines mark the integer harmonic series of the fundamental.