[sdiy] what is the amplitude envelope of a signal

[Grant Richter]

> What the heck is the amplitude envelope of an audio signal?
> (please give a formal description, i.e. something so precise
> that programming would be easy).

Have you considered the RMS (power) value of the signal? The mean function
should remove any audio component.

Someone had an envelope follower based on an Burr-Brown RMS chip?