stupid envelope follower idea

[Ian Fritz]

Terry --

Good point. I was wondering if you wouldn't be able to ge around this
proplem by using RMS detection?  I'm thinking in terms of how envelope
detection is done in noise reduction circuits.

  Ian

----- Original Message -----
From: "Terry Michaels" <104065.2340 at compuserve.com>
> Hi Martin:
>
> One problem with this approach is the various band filters are bound to
> have different group delay times, so waveform peaks passing through the
> filters may not line up timewise afterward.  Since harmonics of the input
> signal will not coincide after passing through the band filters, they will
> not add up algebraically, and you will then detect an envelope that will
> have a different shape than the original signal had.  This wouldn't happen
> with sine waves, but it likely will with harmonically complex signals.
>
> Terry Michaels
>