[linux-audio-dev] Re: Cheby amp code

Tim Goetze tim at quitte.de
Sun Nov 3 14:12:01 UTC 2002

Steve Harris wrote:

>Did you try adding the 0th harmionic to the front of the table, and
>dropping the last harmonic? That made it sound pretty good for low notes.

i still think the harmonic mix doesn't sound right, and it's
becoming obvious why.
>> additionally, it seems that to tackle intermodulation distortion it 
>> is best to split the incoming signal to multiple bands (those great
>> theoreticians have been using FIRs in matlab) and shape each band
>> separately. they do in fact use two blended shapers per band.
>OK, why do they use two shapers? Or is it one cheby and one non polynomial?

two chebyshevs, blend factor depending on incoming amplitude.
>Yeah, I'm thinking we're not tackling it right, if behringer can knock out
>a virtual amp harware box for E150 it can't the that cycle hungry.

funny; now that i'm losing some skepticism about the approach
you seem to pick it up.


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