scipy.signal.ShortTimeFFT. scipy.signal.ShortTimeFFT.invertible# property ShortTimeFFT.invertible# Check if STFT is invertible. This is achieved by trying to calculate the canonical dual window. See also istftInverse short-time Fourier transform. m_numNumber of samples in window win and dual_win. dual_winCanonical dual window. winWindow for STFT. ShortTimeFFTClass this property belongs to.