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Bandpass filter techniques

Started by Isaac Gerg December 16, 2004
Rune Allnor wrote:
> Jerry Avins wrote: > >>I haven't the inclination or endurance to write a treatise on > > filters, > > [... excellent treatise snipped ...] > > Ehmm... it would be very interesting to see what would come out of > it if you ever wrote such a thing "for real"... > > Rune
I might have mentioned that, whereas the poles of a Butterworth lie equally spaced on a semicircle, those of a Chebychev Type I lie on a semiellipse (the semidiameter on the real axis is shortened) but are otherwise similarly arrayed; that a Butterworth's transfer function has only one variable term (that, in the denominator) and the exponent of that term is the order of the filter; and ... But I'm not writing that treatise, am I? Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Jerry Avins wrote:
> Rune Allnor wrote: > > Jerry Avins wrote: > > > >>I haven't the inclination or endurance to write a treatise on > > > > filters, > > > > [... excellent treatise snipped ...] > > > > Ehmm... it would be very interesting to see what would come out of > > it if you ever wrote such a thing "for real"... > > > > Rune > > I might have mentioned that, whereas the poles of a Butterworth lie > equally spaced on a semicircle, those of a Chebychev Type I lie on a > semiellipse (the semidiameter on the real axis is shortened) but are > otherwise similarly arrayed; that a Butterworth's transfer function
has
> only one variable term (that, in the denominator) and the exponent of > that term is the order of the filter; and ... > > But I'm not writing that treatise, am I?
I don't know. Are you? Nevertheless, it's always fun to read stuff from people who are capable of presenting complicated stuff in both succinct, comprehensable and precise ways. Rune Rune