librosa.filters.mr_frequencies

librosa.filters.mr_frequencies(tuning)

Helper function for generating center frequency and samplerate pairs.

This function will return center frequency and corresponding samplerates to obtain similar pitch filterbank settings as described in [1]. (Instead of starting with MIDI pitch A0, we start with C0.)

[1]	Müller, Meinard. “Information Retrieval for Music and Motion.” Springer Verlag. 2007.

Parameters:

tuning : float in [-0.5, +0.5) [scalar]

Tuning deviation from A440 in fractions of a bin.

Returns:

center_freqs : np.ndarray [shape=(n,), dtype=float]

Center frequencies of the filter kernels. Also defines the number of filters in the filterbank.

sample_rates : np.ndarray [shape=(n,), dtype=float]

Samplerate for each filter (used for multirate filterbank).

See also

librosa.filters.semitone_filterbank, librosa.filters._multirate_fb

Notes

This function caches at level 10.