librosa.A_weighting

librosa.A_weighting(frequencies, *, min_db=-80.0)[source]

Compute the A-weighting of a set of frequencies.

Parameters:

frequenciesscalar or np.ndarray [shape=(n,)]: One or more frequencies (in Hz)
min_dbfloat [scalar] or None: Clip weights below this threshold. If None, no clipping is performed.

Returns:

A_weightingscalar or np.ndarray [shape=(n,)]: A_weighting[i] is the A-weighting of frequencies[i]

See also

perceptual_weighting
frequency_weighting
multi_frequency_weighting
B_weighting
C_weighting
D_weighting

Examples

Get the A-weighting for CQT frequencies

>>> import matplotlib.pyplot as plt
>>> freqs = librosa.cqt_frequencies(n_bins=108, fmin=librosa.note_to_hz('C1'))
>>> weights = librosa.A_weighting(freqs)
>>> fig, ax = plt.subplots()
>>> ax.plot(freqs, weights)
>>> ax.set(xlabel='Frequency (Hz)',
...        ylabel='Weighting (log10)',
...        title='A-Weighting of CQT frequencies')