Filters

Filter bank construction

mel(sr, n_fft[, n_mels, fmin, fmax, htk, …])

Create a Mel filter-bank.

chroma(sr, n_fft[, n_chroma, tuning, …])

Create a chroma filter bank.

constant_q(sr[, fmin, n_bins, …])

Construct a constant-Q basis.

semitone_filterbank([center_freqs, tuning, …])

Construct a multi-rate bank of infinite-impulse response (IIR) band-pass filters at user-defined center frequencies and sample rates.

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, …])

Construct a linear transformation matrix to map Constant-Q bins onto chroma bins (i.e., pitch classes).

mr_frequencies(tuning)

Helper function for generating center frequency and sample rate pairs.

window_sumsquare(window, n_frames[, …])

Compute the sum-square envelope of a window function at a given hop length.

diagonal_filter(window, n[, slope, angle, …])

Build a two-dimensional diagonal filter.