Caution

You're reading an old version of this documentation. If you want up-to-date information, please have a look at 0.11.0.

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.
wavelet(*, freqs[, sr, window, ...])	Construct a wavelet basis using windowed complex sinusoids.
semitone_filterbank(*[, center_freqs, ...])	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

wavelet_lengths(*, freqs[, sr, window, ...])	Return length of each filter in a wavelet 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, ...])	Build a two-dimensional diagonal filter.

Deprecated

constant_q(*, sr[, fmin, n_bins, ...])	Construct a constant-Q basis.
constant_q_lengths(*, sr, fmin[, n_bins, ...])	Return length of each filter in a constant-Q basis.