spectralChain(input, fftSize, hopSize, bodyFn) windows and FFTs
input, hands each spectral frame to bodyFn (a
fn(S) S whose argument is the frame signal), and overlap-adds the processed
frames back to a time-domain output. fftSize is the frame length in samples
(a power of two); hopSize is the analysis stride. Operations inside the body
apply to the frame's bins.
-- process the spectrum: the body maps each analysis frame
fn spectralFx() S {
let x = inlet(FLOAT32);
spectralChain(x, 1024, 256, fn(frame S) S {
frame * frame -- e.g. square the bins (spectral contrast)
}) |> outlet
}