ste

Builtin index · Signal processing

result = ste(x, [win=256], [hop=win/2])

Input: x, win, hop · Output: result

What it is

x: a length-N real vector. win (optional number): frame length in samples; hop (optional number, default win/2): samples between successive frame starts.

Overloads

One call shape — this function is not overloaded.

Code	Input	Output	Description
`result = ste(x, [win=256], [hop=win/2])`	`x` vector`x`: a length-N real vector. `win` number, optional (default `256`)`win` (optional number): frame length in samples. `hop` number, optional (default `win/2`)`hop` (optional number, default `win/2`): samples between successive frame starts.	`result` vector	Returns a vector of length `num_frames`, one energy value per frame. Short-time energy: the windowed extension of `energy(x)` over sliding, overlapping frames — the standard way to track how a signal's power evolves over time (e.g. locating bursts in EMG, or voiced/silent segments in speech).

Examples

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

  e_t = ste(emg_signal, 200, 100)   # energy per 200-sample frame, 50% overlap

from numerics-dsp

How it works

ste(x, [win=256], [hop=win/2]) — short-time energy: the windowed extension of energy(x) over sliding, overlapping frames, the standard way to track how a signal's power evolves over time (e.g. locating muscle-activation bursts in an EMG signal, or voiced/silent segments in speech).

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