On Thu, Oct 24, 2002 at 01:19:20 +0200, Tim Goetze wrote: > >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.
Did he give the impression that he though it was an important part of the sound? I'm not clear on this. > 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
