[sdiy] 2164 Korgasmatron VCF

cheater cheater cheater00 at gmail.com
Tue Sep 7 19:56:56 CEST 2010


so what you're saying is if I know the formula of H(s), then |H(jw)|
is the gain at the frequency w?

D.

On Tue, Sep 7, 2010 at 18:28, David G. Dixon <dixon at interchange.ubc.ca> wrote:
>> > Sometimes doing a partial fraction decomposition of a transfer function
>> > helps.
>>
>> Interesting, I wouldn't have thought of that - thanks
>>
>> > Looking at a transfer function as the product of some simple to
>> > understand signal processing blocks (like integrator, differentiators,
>> and
>> > gain stages) for doing a sketch of the composed amplitude and phase
>> response
>> > gives you a more "intuitive" understanding.
>>
>> That's pretty cool. However I have a problem figuring out what the
>> Laplace plane works like. I still don't feel it naturally. Maybe I
>> should go and look at the transfer functions for some basic blocks,
>> that could help make it easier. I wonder what the best things would be
>> to start with.
>
> If you understand complex algebra, then replace the S's with jw's, separate
> the real and imaginary parts top and bottom, find the magnitudes top and
> bottom (i.e., find the square root of the sum of the squares of the real and
> imaginary parts in both numerator and denominator) and plot this against w.
> That will give you the amplitude, which is what you really need to know.
>
>



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