Module mel 

Available on crate feature mel only.

Mel filterbank, (log-)mel spectrograms and MFCCs.

This module is pure math and builds without std. It operates on power spectra (|S|²), which you obtain from a Spectrogram column via spectrum::power.

Conventions follow librosa’s defaults: the Slaney mel scale with area-normalized triangular filters, and an orthonormal DCT-II for MFCCs.

Structs

DctII

An orthonormal type-II DCT, precomputed as a basis matrix.

MelFilterBank

A bank of triangular mel filters mapping n_freqs linear bins to n_mels mel bands.

Enums

MelScale

The mel frequency scale convention.

Functions

hz_to_mel

Convert a frequency in Hz to mels.

mel_to_hz

Convert mels to a frequency in Hz.