/// <summary>
/// Backward short-time Fourier Transform.
/// </summary>
/// <param name="B">Array</param>
/// <returns>Array</returns>
public Complex32[] Backward(Complex32[] B)
{
int N = B.Length, i, j;
Complex32[] A = new Complex32[N];
int frame = coefs.Length;
for (i = 0; i < N; i += frame)
{
Complex32[] data = new Complex32[frame];
for (j = 0; j < frame; j++)
{
data[j] = B[i + j];
}
data = FFT.Backward(data);
for (j = 0; j < frame; j++)
{
A[i + j] = data[j] / coefs[Maths.Mod(i - frame / 2, frame)];
}
}
return(A);
}
