Names and conventions

Variables, locals included, are named for what they hold (n_ramp, start_phases, impulse_response); the rule and its exceptions are in docs/design/philosophy.md. A few short names are the field’s own and stay short everywhere:

Name	Meaning
fs	sampling rate [Hz]
t	times [s] of samples or time windows
f0	fundamental frequency [Hz]; 0 where unvoiced
cf, cfs	center frequency, center frequencies of a filterbank [Hz]
f_lo, f_hi, f_max	band edges and upper limits [Hz]
n_fft	FFT length [samples]
hop	step between time windows [samples, or s where stated]
rms, db	root-mean-square level; level in decibels
erb	equivalent rectangular bandwidth, or ERB-number [Cams]
itd, ild	interaural time [s] and level [dB] difference
ir	impulse response
sos	filter coefficients as second-order sections (SciPy’s format)
rng	a seed or numpy.random.Generator

“Frame” means only the mathematical frame (Frame, GaborFrame, TVGaborFrame: an analysis with an exact inverse). One point of an analysis’s time grid, and the stretch of sound under the window there, is a time window; arrays over them have n_windows entries, and t holds the window center times. In prose the frame classes are always set as code.

Counts start with n_ (n_samples, n_channels); a plural is an array of the singular (freqs, harmonics). Sounds are (n_samples, n_channels): time runs down the first axis.