  Signal amplitude envelope allows to obtain information of the signal features
for different applications. It is widely used to pre-process sound and other
signals of physiological origin in human or animal studies. In order to obtain
signal envelope, a fast and simple algorithm is proposed based on peak
detection. The procedure presented here is quite straightforward and can be
used in different applications of time series analysis. It can be applied in
signals with different origin and frequency content. This algorithm presented
is implemented based on python libraries. An open source code is also provided.
Aspects on the parameter selection are discussed to adapt the same method for
different applications. Also traditional methods are revisited and compared
with the one proposed here.
