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transistor differential amplifier simulation

Type : Waveshaper
References : Posted by Christian[at]savioursofsoul[dot]de

Notes :
Writting an exam about electronic components, i learned several equations about simulating that stuff. One simplified equation was the tanh(x) formula for the differential amplifier. It is not exact, but since the amplifiers are driven with only small amplitudes the behaviour is most often even advanced linear.
The fact, that the amp is differential, means, that the 2n order is eliminated, so the sound is also similar to a tube.
For a very fast use, this code is in pure assembly language (not optimized with SSE-Code yet) and performs in VST-Plugins very fast.
The code was written in delphi and if you want to translate the assembly code, you should know, the the parameters passing is done via registers. So pinp=EAX pout=EDX sf=ECX.


Code :
procedure Transistor(pinp,pout : PSingle; sf:Integer; Faktor: Single);
asm
fld Faktor
@Start:
fld [eax].single
fmul st(0),st(1)

fldl2e
fmul
fld st(0)
frndint
fsub st(1),st
fxch st(1)
f2xm1
fld1
fadd
fscale { result := z * 2**i }
fstp st(1)

fld st(0)
fmulp

fld st(0)
fld1
faddp
fld1
fsubp st(2),st(0)
fdivp

fstp [edx].single

add eax,4
add edx,4
loop @Start
fstp st(0)
end;



Comments


Added on : 30/08/13 by matts[ AT ]sen-do[ DOT ]de
Comment :
well i'am trying read this your write in fage home.i'm was cufinos about asembly, now i'am starting learn basic asemblyplease can you give me guide asembly basical. i'am using bactrack sistem operation for education focus asemble and i'am stil newbie.pardon me regardszammi



Added on : 31/08/13 by martinuk[ AT ]physics[ DOT ]ubc[ DOT ]ca
Comment :
Weeeell  that first  less-than  is supposed to be an<a href="http://hduzqvykf.com"> aesarpmnd</a> in my comment  but not in your code Agh, you see what it looks like in the first code block in your own dang post!



Added on : 01/09/13 by mariajames[ AT ]tiscali[ DOT ]it
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Added on : 07/09/13 by dcrisp[ AT ]bmpartners[ DOT ]com[ DOT ]au
Comment :
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