Caution

You're reading an old version of this documentation. If you want up-to-date information, please have a look at 0.9.1.

librosa.filters.constant_q_lengths¶

librosa.filters.constant_q_lengths(sr, fmin, n_bins=84, bins_per_octave=12, tuning=<DEPRECATED parameter>, window='hann', filter_scale=1)[source]¶

Return length of each filter in a constant-Q basis.

Parameters

srnumber > 0 [scalar]: Audio sampling rate
fminfloat > 0 [scalar]: Minimum frequency bin.
n_binsint > 0 [scalar]: Number of frequencies. Defaults to 7 octaves (84 bins).
bins_per_octaveint > 0 [scalar]: Number of bins per octave
tuningfloat [scalar] <DEPRECATED>: Tuning deviation from A440 in fractions of a bin

Note

This parameter is deprecated in 0.7.1. It will be removed in version 0.8.
windowstr or callable: Window function to use on filters
filter_scalefloat > 0 [scalar]: Resolution of filter windows. Larger values use longer windows.

Returns

lengthsnp.ndarray: The length of each filter.