EMG envelope to neural excitation

Rectifies and normalises an EMG envelope to [0, 1], with an optional A-shape (exponential) EMG-to-activation non-linearity.

Usage

emgToExcitation(emg, max_emg = NULL, nonlin = 0)

Arguments

emg

EMG envelope (already rectified/smoothed, or raw — abs is taken).

max_emg

Normalising maximum (default: the signal maximum).

nonlin

Non-linearity coefficient A (0 = linear; typical -3..0 or positive for a convex map).

Value

Excitation in [0, 1].

Examples

emgToExcitation(c(0.1, 0.5, 0.9, 0.3))
#> [1] 0.1111111 0.5555556 1.0000000 0.3333333