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.