librosax.istft

istft(stft_matrix: Array, hop_length: int = None, win_length: int = None, n_fft: int = None, window: str = 'hann', center: bool = True, length: int = None)[source]

Compute the Inverse Short-Time Fourier Transform (ISTFT).

This function reconstructs a waveform from an STFT matrix using JAX’s scipy.signal.istft implementation.

Parameters:

  • stft_matrix – The STFT matrix from which to compute the inverse.

  • hop_length – Number of samples between successive frames. Default is win_length // 4.

  • win_length – Window size. Default is n_fft.

  • n_fft – FFT size. Default is (stft_matrix.shape[-2] - 1) * 2.

  • window – Window function type. Default is "hann".

  • center – If True, assumes the waveform was padded so that frames were centered. Default is True.

  • length – Target length for the reconstructed signal. If None, the entire signal is returned.

Returns:

Reconstructed time-domain signal.

Return type:

jnp.ndarray

Raises:

AssertionError – If center is False because the function is only tested for center=True.