Re: 80dB now but still needs improvement at 1KHz

john larkin <jl@glen--canyon.com> wrote:

[...]

It's interesting that the classic filters (Butterworth, Chebychev,
Cauer) are based on mathematical approximations that pre-date
electronics. They were used to compose tables for artillery or
something.

Chebychef did his calculations on the mechancal lnkages used to operate
the valves of steam locomotives, generating linear motion and sharp
movement from the superimposed effects of rotary motions.


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~ Liz Tuddenham ~
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