Shannon-energy envelope

-x^2 * log(x^2) with a small floor to guard log(0). Amplifies moderate-energy components, useful as a preprocessor for heart-sound segmentation.

Usage

morie_dsp_shannon_energy(x)

Arguments

x

Numeric vector.

Value

Numeric vector, length(x).

References

Rangayyan & Krishnan (2015), Ch. 4, sec. 4.5; Liang et al. (1997).