PSN-L Email List Message
Subject: Wielandt's "inverse filter" or integrator
From: "David H. Youden" dyouden@.............
Date: Mon, 13 Dec 2004 07:11:26 -0500
Good morning all,
I am looking for some enlightenment on the subject circuit. I know just
enough about it to be dangerous and not enough to understand what
exactly it does and how to select the corner frequency of the high pass
filter. I have not been able to obtain a copy of Wielandt's paper "Noise
in Electronic Seismograph Systems", so if anyone has an electronic copy
(in english) I would appreciate a copy. Short of that, can anyone
provide an explanation of how this thing works, and what the
alternatives to it might be.
I understand that the output of the high pass filter is fed back to the
input amplifier and subtracted from the input signal, but doesn't the
phase shift in the filter prevent this from working as Allan Coleman
describes in his papers?
Thanks for any help you may provide
Public Seismic Network Mailing List (PSN-L)
[ Top ]
[ Back ]
[ Home Page ]