Talk:Digital signal processing: Difference between revisions

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== Nav box creation ==

I created a nav box for DSP: {{tl|DSP}}. Knock yourself out... [[User:Cburnett|Cburnett]] 04:11, 2 December 2006 (UTC)

==External Links,FIR Movablevs IIR Feast==

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.

I've cleared the external links because they are unnecessary, and serve to attract linkspam. Please add content to the article and cite references. [[User:Jehochman|Jehochman]] (^{[[User_talk:Jehochman|Talk]]}/_{[[Special:Contributions/Jehochman|Contrib]]}) 04:07, 11 December 2006 (UTC)

And also, the ideal lowpass "sinc" filter is an IIR filter, though it is commonly written using only inputs samples.

==[[Least-squares spectral analysis]]==

I like to point your attention to the following issue. According to this page autocorrelation has its own ___domain. Can somebody please explain why this is stated as such? Because the output values are a function of time! <span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/19524.241130.2389.8871|19524.241130.2389.8871]] ([[User talk:19524.241130.2389.8871|talk]]) 2021:0220, 199 DecemberSeptember 20112012 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->

This recently created page is tied up in conflict. Extra eyes and opinions would be welcome; see the RFC on its talk page, and other talk sections; expert content input would also be of considerable value, but the topic is a bit narrow so I don't expect to find an expert here. [[User:Dicklyon|Dicklyon]] 00:52, 23 October 2007 (UTC)

: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)

== Autocorrelation ___domain ==

:There is a more important difference between y[n] = y[n-1] + x[n] - x[n-k] &nbsp;and&nbsp; y[n] = x[n] + x[n-1] + ... + x[n-k+1].

I like to point your attention to the following issue. According to this page autocorrelation has its own ___domain. Can somebody please explain why this is stated as such? Because the output values are a function of time! <span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/195.241.238.88|195.241.238.88]] ([[User talk:195.241.238.88|talk]]) 20:02, 19 December 2011 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->

:With floating-point arithmetic, the recursive implementation has arithmetic error accumulation (random-walk) as n increases. The FIR implementation does not.

:--[[User:Bob K|Bob K]] ([[User talk:Bob K|talk]]) 13:47, 18 September 2016 (UTC)

== Intro reads like an app note, not a text book ==

{{Archive top |result=No longer in article ~[[User:Kvng|Kvng]] ([[User talk:Kvng|talk]]) 16:33, 3 April 2020 (UTC)}}

:The goal of DSP is usually to measure, filter and/or compress continuous real-world analog signals. '''The first step is usually to convert the signal from an analog to a digital form, by sampling and then digitizing it using an analog-to-digital converter (ADC), which turns the analog signal into a stream of numbers. However, often, the required output signal is another analog output signal, which requires a digital-to-analog converter (DAC).''' Even if this process is more complex than analog processing and has a discrete value range, the application of computational power to digital signal processing allows for many advantages over analog processing in many applications, such as error detection and correction in transmission as well as data compression.

I think this paragraph shows evidence of making sense, but doesn't. This should stick to first princples (sampling and quantization), or discuss what could be described as "degrees of freedom over domains of operation" (the group of all applications).

As it is, it's been hacked to one odd class of applications. On a music CDROM it's called "ADA". My analog outputs are usually PWM. [[User:JohnPritchard|JohnPritchard]] ([[User talk:JohnPritchard|talk]]) 16:16, 2 January 2013 (UTC)

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== Don't Talk - Write. ==

This article has languished for too long. Complaining about things you dislike will not make it better. Start writing. I will begin on the lead - which sucks btw. [[User:Codwiki|Codwiki]] ([[User talk:Codwiki|talk]]) 16:19, 7 July 2015 (UTC)

== Time and space domains ==

It seems as though most of the content of [[Digital_signal_processing#Time_and_space_domains|this section]] is about [[Digital filter]], not [[Time ___domain]]. I think I could find a place for the material in [[Digital filter]] and then summarize [[Time ___domain]] in this section and also add something about space ___domain for digital imaging processing. I'm happy to do this [[WP:BOLD]]ly; not looking for permission. Mostly posting here as a reminder to myself. But, if anyone has any objections or suggestions, feel free to respond. ~[[User:Kvng|Kvng]] ([[User talk:Kvng|talk]]) 16:30, 13 February 2018 (UTC)

{{done}} ~[[User:Kvng|Kvng]] ([[User talk:Kvng|talk]]) 20:39, 24 August 2020 (UTC)

== FIR filters have many advantages, but are computationally more demanding ==

{{u|M.perkins}} changed FIR to IIR and I had to look carefully to recognise this was wrong. I removed the whole sentence because the section is about Z-plane analysis, not computational efficiency and the sentence does not explain the advantages of an FIR filter. {{u|Dicklyon}} reverted to the original. I beleive these facts are already covered in [[Finite impulse response]] and [[Infinite impulse response]] and teasing them in this section is unnecessary and appears to be causing some confusion. ~[[User:Kvng|Kvng]] ([[User talk:Kvng|talk]]) 15:45, 26 March 2019 (UTC)

:OK with me if you take it out after considering the correction I reverted to. [[User:Dicklyon|Dicklyon]] ([[User talk:Dicklyon|talk]]) 02:42, 27 March 2019 (UTC)

::[https://en.wikipedia.org/w/index.php?title=Digital_signal_processing&type=revision&diff=890154422&oldid=889500724 Removed] ~[[User:Kvng|Kvng]] ([[User talk:Kvng|talk]]) 14:08, 30 March 2019 (UTC)

== Uncertainity ==

Sorry, Heisenberg wasn’t just talking about particles.. https://pages.hmc.edu/ruye/e161/lectures/fourier/node2.html#:~:text=in%20frequency%20domain%20provides%20complete,the%20signal%2C%20but%20never%20both. [[User:Greglocock|Greglocock]] ([[User talk:Greglocock|talk]]) 20:07, 26 July 2025 (UTC)

:Thanks, I did not know this. ~[[User:Kvng|Kvng]] ([[User talk:Kvng|talk]]) 23:15, 26 July 2025 (UTC)