# [CM] Finding the duration of a time-varying resampled sound.

**James Ravan
**
jamesravan@comcast.net

*Tue, 28 Oct 2003 10:41:15 -0500*

>* Since both envelopes are straight lines going
*>* from (0 1) to (1 0.5), the two numbers
*>* should have been equal. So that proves
*>* that just finding the average inverse factor
*>* is not enough.
*>*
*>* I think its only a matter of doing a straight integral
*>* calculation of some sort, but I just cant figure out
*>* how.
*
It's been a while since calculus, but just thinking about it abstractly,
don't you want to (a) calculate the areas of the triangles formed by the
envelope's line segments and the x-axis and then (b) add those together?