Module grid 

The design grid every full-resolution spectrum lives on.

Upstream: correction_engine.py SR, N_FFT, freqs().

Constants

BINS

Bins of a full design spectrum, N_FFT / 2 + 1.

N_FFT

Design FFT length, 2^17 (0.366 Hz bins), enough to resolve low room modes.

SR

Design sample rate in Hz. Every measurement must use it (upstream checks only the main position; SECS 2R checks all, D2).

SR_F

SR as a float, for arithmetic.

Functions

design_freqs

secs_dsp::grid::freqs(N_FFT, SR), computed once per process.