stupid envelope follower idea

[Martin Czech]

:::Imagine splitting the input signal into three bands with three
:::envelope detectors:
:::  20 to 80 Hz, slow envelope detector
:::  80 to 320 Hz, medium envelope detector
:::  320 Hz and up, really fast envelope detector
:::
:::And summing the results.  If the input signal has no content below 320
:::Hz, you've got a really fast envelope detector.  If you happen to play
:::one of the two lower strings on the guitar, the really fast envelope
:::detector catches the harmonics from the initial transient and the
:::medium speed envelope detector predominates after that.  Only for low
:::frequency inputs does the slower envelope detector come into play.

Ok, I have to think about that. I guess 6dB/oct filters would do.
In that case a highpass could be derived from the lowpass at the same
edge (you know, in the way frequency splitters were once proposed).
I guess that a sweeping sine then would give a flat envelope, as it should.


:::
:::   Balanced modulation should give the same envelope, but with less
:::   low frequency energy, only 50%. Since the lower side band is mirrored,
:::   even less. 
:::
:::Ahh, interesting.  But this won't fill in any of the space between
:::the peaks of the input signal, so I don't see it having much of an
:::advantage.  

Right, but one could use peak hold circuits at every modulator peak,
so a stepped envelope approximation could be obtained.
I don't know.

m.c.