librosa.effects.time_stretch¶
-
librosa.effects.
time_stretch
(y, rate)[source]¶ Time-stretch an audio series by a fixed rate.
Parameters: - y : np.ndarray [shape=(n,)]
audio time series
- rate : float > 0 [scalar]
Stretch factor. If rate > 1, then the signal is sped up.
If rate < 1, then the signal is slowed down.
Returns: - y_stretch : np.ndarray [shape=(rate * n,)]
audio time series stretched by the specified rate
See also
pitch_shift
- pitch shifting
librosa.core.phase_vocoder
- spectrogram phase vocoder
Examples
Compress to be twice as fast
>>> y, sr = librosa.load(librosa.util.example_audio_file()) >>> y_fast = librosa.effects.time_stretch(y, 2.0)
Or half the original speed
>>> y_slow = librosa.effects.time_stretch(y, 0.5)