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The content of Anti-causal filter was merged into Causal filter on 2014-02-07. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. For the discussion at that location, see its talk page.

This could be explained in much simpler words with no loss of information. Needs a layman's introduction at least. — Omegatron 23:04, 2 December 2005 (UTC)[reply]

Example needs correction

The example given, which should be relatively straightforward, is needlessly confusing. Why present the output for the causal system in terms of f(t-1) rather than f(t)? In fact, this is incorrect. It should read “A realizable output is

f(t)=\int _{-2}^{0}s(t+\tau )\,d\tau =\int _{0}^{+2}s(t-\tau )\,d\tau \,

which is a delayed version of the non-realizable output." Lacshoet (talk) 13:44, 25 May 2026 (UTC)[reply]

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Talk:Causal filter

Example needs correction

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