fftSize

Summary

The size of the FFT (Fast Fourier Transform) used for frequency-domain analysis. Must be a power of two in the range 32-2048; defaults to 2048.

Note: This property is read-only.

var result = AnalyserNode.fftSize;

Returns an object of type unsigned longunsigned long

var audioCtx = new AudioContext();
var analyser = audioCtx.createAnalyser();
analyser.fftSize = 2048;