Caution

You're reading an old version of this documentation. If you want up-to-date information, please have a look at 0.9.1.

Filters

Filter bank construction

mel(sr, n_fft[, n_mels, fmin, fmax, htk, ...])	Create a Filterbank matrix to combine FFT bins into Mel-frequency bins
chroma(sr, n_fft[, n_chroma, tuning, A440, ...])	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 multirate filterbank 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, ...])	Convert a Constant-Q basis to Chroma.
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.