istft.lua

signal = require "signal"
complex = require "signal.complex"

function istft(X, win, hop)
    local x = torch.zeros((X:size(1)-1)*hop + win)
    framesamp = X:size(2)
    hopsamp = hop
    for n=1,X:size(1) do
        i = 1 + (n-1)*hopsamp
        print(i, i + framesamp - 1)
        x[{{i, i + framesamp - 1}}] = x[{{i, i + framesamp - 1}}] + complex.real(signal.ifft(X[n]))
    end
    return x
end