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

Jeroen Belleman <jeroen@nospam.please> wrote:

On 11/6/24 23:15, Liz Tuddenham wrote:

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.

 
Did he indeed? Interesting. Do you perchance have a reference?

I remembered reading about his work on steam engines several decades
ago, but can't give you a reference.  Apparently the maths he developed
for sharp steam valve movement was later found to be applicable to
electronic filter cutoffs as well.  The linkages for linear motion were
something I didn't know about until I looked it up on Wikipedia.


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~ Liz Tuddenham ~
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