Module spectrum 

Structs

Band

Framed

Peak

Spectrum

Constants

MAX_FRAME

MAX_PINNED_FRAME

One FFT’s memory, which is all that bounds a caller’s own frame.

MIN_FRAME

Functions

analyze

db

magnitudes

A full-scale sine reads 1.0 at its own bin. Without frame_secs the size follows the range, so two ranges land on two bin grids.

magnitudes_of

peaks

Local maxima, parabolically interpolated so a peak between two bins reports its real frequency instead of the nearest bin’s.

pinned_frame

A caller checks this against MAX_PINNED_FRAME: a shrunk frame is not a pinned one.

third_octave_edges

Third-octave from 20 Hz up.