New Filter Designs

[Paul Perry]

At 02:07 PM 16/08/99 -0500, Grant Richter wrote:

>Can anybody explain why the commutating capacitors
>create comb filters at what seem to be octave intervals
>of the clock frequency? My brain doesn't seem to be
>able to grok this.
>
If the freq of the commutator is EXACTLY 100Hz, then a 100Hz 
input (?200Hz) is completely removed.
And, anything that is an exact multiple of this.
At other freqs, some of the orig sig gets thru.

That's my 'handwaving' explanation, anyway!

paul perry (not drowning but waving.. I hope!) Melbourne Australia