AnalyserNode windowing

Question

The AnalyserNode of WebAudio has a FFT to get the frequency domain data of a sound signal. I don't understand how the windowing function of the FFT is defined. Is it possible to change the window size or even the window-function (i.e. Hanning or Blackman)? If the window is not adjustable, what is the window size and which windowing function is used?

Unfortunately I was't able to find that in the docs.

Answer 1

The spec has been updated with more detail on how the windowing in the AnalyserNode is done: http://webaudio.github.io/web-audio-api/#fft-windowing-and-smoothing-over-time

In summary, the window size is the FFT size, and the window function is fixed to be Blackman window.