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librosa.filters.mr_frequencies

librosa.filters.mr_frequencies(tuning)

Helper function for generating center frequency and sample rate pairs.

This function will return center frequency and corresponding sample rates 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

tuningfloat [scalar]

Tuning deviation from A440, measure as a fraction of the equally tempered semitone (1/12 of an octave).

Returns

center_freqsnp.ndarray [shape=(n,), dtype=float]

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

sample_ratesnp.ndarray [shape=(n,), dtype=float]

Sample rate for each filter, used for multirate filterbank.

See also

librosa.filters.semitone_filterbank

librosa.filters._multirate_fb

Notes

This function caches at level 10.