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== FIR vs IIR ==▼
The distinction between FIR and IIR is not recursion. for example, y[n] = y[n-1] + x[n] - x[n-k] is not an IIR filter as it could be rewritten as the sum of the last k samples. The actual distinction is based on the number of non-zero outputs for a non-zero input. ▼
And also, the ideal lowpass "sinc" filter is an IIR filter, though it is commonly written using only inputs samples.▼
<span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/24.130.9.71|24.130.9.71]] ([[User talk:24.130.9.71|talk]]) 21:20, 9 September 2012 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->▼
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I think it may be fumble fingers (I've assumed that and edited the article accordingly), or it could be a confusion in menaing between ___domain as in field of analysis, and ___domain as in units on x axis. Same question would be asked of wavelets, the units are seconds and Hz in the plots I look at. [[User:Greglocock|Greglocock]] ([[User talk:Greglocock|talk]]) 06:24, 20 December 2011 (UTC)
▲== FIR vs IIR ==
▲The distinction between FIR and IIR is not recursion. for example, y[n] = y[n-1] + x[n] - x[n-k] is not an IIR filter as it could be rewritten as the sum of the last k samples. The actual distinction is based on the number of non-zero outputs for a non-zero input.
▲And also, the ideal lowpass "sinc" filter is an IIR filter, though it is commonly written using only inputs samples.
▲<span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/24.130.9.71|24.130.9.71]] ([[User talk:24.130.9.71|talk]]) 21:20, 9 September 2012 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->
:In your example filter, the output can be nonzero forever with no input. It is not what is usually called an FIR filter, nor what is usually called stable. I reverted your edit to the article; I believe it is correct as stated. [[User:Dicklyon|Dicklyon]] ([[User talk:Dicklyon|talk]]) 04:12, 10 September 2012 (UTC)
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