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Samuel,<br>
<br>
<font face="Courier New">Just a detail: in some books the p variable
is used as the Laplace variable, especially when working with
normalized variables. For instance, a normalizad butterworth
filter may pe presented as<br>
<br>
1/(1 + 2*p + 2*p^2 + p^3)<br>
<br>
I recall Bildstein's book on Active filters. See also: <br>
<br>
<a class="moz-txt-link-freetext" href="https://books.google.com.ar/books?id=r5yjPuWQde0C&pg=PR20&lpg=PR20&dq=%22normalized+laplace+variable%22&source=bl&ots=L0hFQ4aA2a&sig=ACfU3U3DpwZTwRN1lMwtxf6RztQHFPj_6Q&hl=es-419&sa=X&ved=2ahUKEwi2hceJk8flAhUhD7kGHcLsBRUQ6AEwAXoECAkQAQ#v=onepage&q=%22normalized%20laplace%20variable%22&f=false">https://books.google.com.ar/books?id=r5yjPuWQde0C&pg=PR20&lpg=PR20&dq=%22normalized+laplace+variable%22&source=bl&ots=L0hFQ4aA2a&sig=ACfU3U3DpwZTwRN1lMwtxf6RztQHFPj_6Q&hl=es-419&sa=X&ved=2ahUKEwi2hceJk8flAhUhD7kGHcLsBRUQ6AEwAXoECAkQAQ#v=onepage&q=%22normalized%20laplace%20variable%22&f=false</a><br>
<br>
</font>But it is true that most references use s.<br>
<br>
Regards, <br>
<br>
Federico Miyara<br>
<br>
<br>
<div class="moz-cite-prefix">On 30/10/2019 19:02, Samuel Gougeon
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:85cb1dbd-3b93-980a-1b36-24d67d9ca850@free.fr">
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<div class="moz-cite-prefix">Le 30/10/2019 à 10:26, Perrichon a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:!&!AAAAAAAAAAAuAAAAAAAAAHTRbxuKTONJuQv%2FnFKuTP8BANlTnCJhprtFudq2LHCBs8EBACQA%2F%2F8AABAAAACmwcOS6n6CS5mWVhztVHKsAQAAAAA=@wanadoo.fr">
<div class="WordSection1">
<p class="MsoNormal">Hello</p>
<p class="MsoNormal">CLR design component brings confusion by
forgetting the * sign in operand </p>
<p class="MsoNormal">of a polynomial representation in Laplace
plan</p>
<p class="MsoNormal">It makes schemes unreadeable</p>
</div>
</blockquote>
<p>First, you know that la Laplace variable is always s.<br>
Second, in such specific cases, you can anyway use this:</p>
<p><img src="cid:part1.AE2A19ED.75360B68@fceia.unr.edu.ar" alt=""
class="" width="442" height="184"></p>
<p>Samuel</p>
<p><br>
</p>
<br>
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