Talk:Causal system

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Help..what is NON-causal?

the only thing I can think of is a digital filter that because of delays, gets hi-frequency information before the pulse 'hits'. PLEASE talk about this. CorvetteZ51 (talk) 09:03, 16 April 2017 (UTC)[reply]

Incorrect example in article

The article lists: y \left( t \right) =x(-t) as an example of an anticausal system...this is only true is t<0. For instance, let t=1. Then the value of the output signal at t=1, y(1), is determined uniquely by the input signal at time t=-1, i.e. x(-1). This is clearly causal. —Preceding unsigned comment added by 130.15.81.250 (talk) 19:16, 15 February 2011 (UTC)[reply]

Status of Article

I happened to be studying for a Signals & Systems exam, and I noticed this article was a bit hard to understand. So, I went ahead and tried to make the first paragraph a bit clearer, but I don't have the time to make the mathematical notation clearer. I hope there is someone out there that can do that.

Nutshell: Someone with math notation skills, please clean this article up.

Good Luck, Pg8p 08:41, 14 December 2006 (UTC)[reply]

Example Suggestion

This article could do well with a basic example to illustrate the concept more clearly. A graph and a few equations would go a long way.

Good Luck, Pg8p 08:41, 14 December 2006 (UTC)[reply]

Causal vs. Memory Systems?

Is there any difference between causal and memory systems?

This information from System analysis... hope it helps

Memoryless systems do not depend on any past input.
Systems with memory do depend on past input.
Causal systems do not depend on any future input.

Best,

Pg8p 08:41, 14 December 2006 (UTC)[reply]

Dependence on the output?

y(n)= y(n-1)+ x(n) seems also causal, nevertheless the definition does not include such a case. Can we make a solid statement on that? (My textbook could not clarify it either.) —Preceding unsigned comment added by Fonduesuisse (talk • contribs) 13:19, 11 October 2007 (UTC)[reply]

Mathematical DefinitionS

It should be explained, that in this paragraph two definitions of causality are shown. —Preceding unsigned comment added by 134.130.44.166 (talk) 18:08, 8 November 2007 (UTC)[reply]

Should the first mathematical definition include a "for every $t_{0}$ "? It seems the current definition is actually giving conditions for when a system is causal at $t_{0}$ . The condition given needs to apply at all $t_{0}$ in order for the system to be causal, right?