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librosa.filters.mr_frequencies

librosa.filters.mr_frequencies(tuning)[source]

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.

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.