librosa.core.ifptrack¶
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librosa.core.
ifptrack
(y, sr=22050, n_fft=2048, hop_length=None, fmin=None, fmax=None, threshold=0.75)[source]¶ Instantaneous pitch frequency tracking.
Warning
Deprecated in librosa 0.4
ifptrack
will be removed in 0.5. Seepiptrack
for comparable functionality.Parameters: y: np.ndarray [shape=(n,)]
audio signal
sr : number > 0 [scalar]
audio sampling rate of y
n_fft: int > 0 [scalar]
FFT window size
hop_length : int > 0 [scalar] or None
Hop size for STFT. Defaults to n_fft / 4. See
librosa.core.stft
for details.threshold : float in (0, 1)
Maximum fraction of expected frequency increment to tolerate
fmin : float or tuple of float
Ramp parameter for lower frequency cutoff.
If scalar, the ramp has 0 width.
If tuple, a linear ramp is applied from fmin[0] to fmin[1]
Default: (150.0, 300.0)
fmax : float or tuple of float
Ramp parameter for upper frequency cutoff.
If scalar, the ramp has 0 width.
If tuple, a linear ramp is applied from fmax[0] to fmax[1]
Default: (2000.0, 4000.0)
Returns: pitches : np.ndarray [shape=(d, t)]
magnitudes : np.ndarray [shape=(d, t)]
Where d is the subset of FFT bins within fmin and fmax.
pitches[i, t] contains instantaneous frequencies at time t
magnitudes[i, t] contains their magnitudes.
D : np.ndarray [shape=(d, t), dtype=complex]
STFT matrix
See also
Examples
>>> y, sr = librosa.load(librosa.util.example_audio_file()) >>> pitches, magnitudes, D = librosa.ifptrack(y, sr=sr)