24 Oct
2002
24 Oct
'02
11:05 a.m.
On Thu, Oct 24, 2002 at 01:19:20 +0200, Tim Goetze wrote:
Did he give the impression that he though it was an important part of the
sound? I'm not clear on this.
I'm 90%
sure its from the crossover between the two halves of the class B
amp (thats the power amp IIRC).
drat. i wish i was better at understanding electronics.
the amp guy pointed in this direction too. the aliasing is not that strong, you're right.
maybe i'm
over-sensitive.
No, no. Aliasing really ruins analogue effects IMHO. On Friday and/or over
the weekend I'm dig out my bass and try it.
what i gather from the scope shots and the analog
distortion
guy's pages is that we want a range of clipping from none to
square. if we're going implement 'square' clipping -- which
Yes, that sounds about right.
we'll need for the real rough tone -- we'll
have to come up
with a bandlimited solution. the current valve clipping is
real soft compared to those scope shots, isn't it? if we
stack the valve to get to hard clipping, the net result will
carry the sum of all aliasing i'm afraid.
Yes, it will compund it. I can't think how to apply oscillator
antialiasing to wavewhaping though. Maybe it can be done.
my feeling is that oversampling alone will not do,
although
you're probably right in that it will get rid of most of
the aliasing.
Its how most people tackle to problem. I think I can get the valve cheap
enough that it will be practical.
i'm thinking about how to apply the technique to
produce
square clipping, or better a [0 .. 1] range of clipping,
but the integration approach is awkward.
I doubt that the electronics ever produces hard square clips.
- Steve