[RE: minimal interpolating scanner]

[Harry Bissell]

Harry Bissell writes: I'm not sure I'm completely with this thread... If you
truncated a tiny bit or the lowest end if the triangle (to make a small
dead-band) that would probably cover the glitch (which probably would be
audible) but the error in the cross-fade probably wouldn't be. JH
is your web site back after your disk crash??? I want to look at the scanner
schem again to refresh my memory.  :-) Harry

jh <jhaible at primus-online.de> wrote:

>I cant see exactly what could be misaligned here..

Just consider 3 VCAs. Each VCA is controlled by a triangle function.
In the ideal case, triangle 1 goes to zero when triangle 2 reaches its
maximum, and triangle 3 starts at the very same point.
Now with a little misalignment, you might have a small region where
3 VCAs are on: triangle 1 not completely off yet, triangle 2 near maximum,
triangle 3 already starting. Not ideal, but not much of a problem in practice
either.
No think of VCA 3 being the same as VCA 1, with switching of inputs
involved. You will hear the switching, i.e. a glitch.

JH.


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