Filters

Filter bank construction

dct(n_filters, n_input)	Discrete cosine transform (DCT type-III) basis.
mel(sr, n_fft[, n_mels, fmin, fmax, htk, norm])	Create a Filterbank matrix to combine FFT bins into Mel-frequency bins
chroma(sr, n_fft[, n_chroma, A440, ctroct, …])	Create a Filterbank matrix to convert STFT to chroma
constant_q(sr[, fmin, n_bins, …])	Construct a constant-Q basis.
_multirate_fb([center_freqs, sample_rates, …])	Helper function to construct a multirate filterbank.
semitone_filterbank([center_freqs, tuning, …])	Constructs a filterbank with 88 filters mimicing the equal-tempered scale.

Window functions

window_bandwidth(window[, n])	Get the equivalent noise bandwidth of a window function.
get_window(window, Nx[, fftbins])	Compute a window function.

Miscellaneous

constant_q_lengths(sr, fmin[, n_bins, …])	Return length of each filter in a constant-Q basis.
cq_to_chroma(n_input[, bins_per_octave, …])	Convert a Constant-Q basis to Chroma.
mr_frequencies(tuning)	Helper function for generating center frequency and samplerate pairs.
window_sumsquare(window, n_frames[, …])	Compute the sum-square envelope of a window function at a given hop length.