tkeo

Builtin index · Signal processing

result = tkeo(x)

Input: x · Output: result

What it is

x: a length-N real vector.

Overloads

One call shape — this function is not overloaded.

Code	Input	Output	Description
`result = tkeo(x)`	`x` vectornot documented yet	`result` vector	Returns a length-`(N-2)` vector (like `diff`, doesn't pad — the definition needs a neighbor on each side). Teager-Kaiser Energy Operator, a cheap near-instantaneous nonlinear energy tracker: `psi[x(n)] = x(n)^2 - x(n-1)*x(n+1)`.

Examples

From the documentation, and run by the build -- the output and the figure below are what the engine actually produced. Simplest first.

  e = energy(signal)
  instant_energy = tkeo(signal)   # length(signal) - 2 (needs a neighbor each side)

from numerics-dsp

How it works

tkeo(x) — the Teager-Kaiser Energy Operator, a cheap near-instantaneous nonlinear energy tracker (single-sample resolution): psi[x(n)] = x(n)^2 - x(n-1)*x(n+1). Returns length(x)-2 values, like diff not padding to preserve length since the definition needs a neighbor on each side.

From the note above this builtin in the interpreter, where the reasoning was written down as it was built.