{"id":3574,"date":"2022-04-26T16:21:17","date_gmt":"2022-04-26T14:21:17","guid":{"rendered":"https:\/\/techgoggler.com\/it\/?p=3574"},"modified":"2023-03-29T18:46:32","modified_gmt":"2023-03-29T16:46:32","slug":"filtri-ricorsivi-iir","status":"publish","type":"post","link":"https:\/\/techgoggler.com\/it\/filtri-ricorsivi-iir\/","title":{"rendered":"Filtri ricorsivi (IIR)"},"content":{"rendered":"<p>In campo digitale, l&#8217;espressione che descrive il comportamento di un circuito in cui una parte dell&#8217;uscita viene riportata in ingresso secondo un coefficiente &alpha; deve rispettare il principio di causalit\u00e0 e quindi l&#8217;uscita all&#8217;istante n potr\u00e0 essere funzione di se stessa solo limitatamente agli istanti precedenti; ad esempio, la sua forma pi\u00f9 semplice \u00e8 fornita dalla relazione:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techgoggler.com\/it\/wp-content\/ql-cache\/quicklatex.com-8b698ca112156b98c15ef2f80c89255d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#121;&#40;&#110;&#41;&#61;&#92;&#97;&#108;&#112;&#104;&#97;&#32;&#120;&#40;&#110;&#41;&#43;&#40;&#49;&#45;&#92;&#97;&#108;&#112;&#104;&#97;&#32;&#41;&#121;&#40;&#110;&#45;&#49;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"319\" style=\"vertical-align: -6px;\"\/><\/p>\n<p>Traducendo in parole la [1], possiamo dire che l&#8217;uscita del filtro \u00e8 pari in ogni istante ad una frazione &alpha; dell&#8217;ingresso in quell&#8217;istante, sommata all&#8217;uscita nell&#8217;istante precedente moltiplicata per il complemento di &alpha;.<\/p>\n<p>Questo meccanismo viene detto ricorsivo, per analogia a quanto avviene in campo informatico, poich\u00e8 l&#8217;uscita all&#8217;istante n \u00e8 funzione dell&#8217;uscita all&#8217;istante n-1 che a sua volta \u00e8 funzione dell&#8217;uscita all&#8217;istante n-2 e cos\u00ec via.<\/p>\n<p>Dalla [1] vediamo che il fattore &alpha; ha il ruolo di una costante di tempo poich\u00e8 ci dice quanto l&#8217;uscita nello stato attuale dipenda dall&#8217;uscita nello stato precedente e quindi ci s\u00e0 una stima della velocit\u00e0 con cui varia l&#8217;uscita stessa.<\/p>\n<p>Infatti, per &alpha;=1 l&#8217;uscita dipende solamente dall&#8217;ingrsso in quell&#8217;istante (costante di tempo nulla), mentre per &alpha;=0 l&#8217;uscita \u00e8 sempre uguale a quella nell&#8217;istante precedente e quindi non c&#8217;\u00e8 nessuna evoluzione, qualsiasi sia l&#8217;ingresso (costante di tempo infinita).<\/p>\n<p>Raramente, tuttavia, ci si servir\u00e0 di un filtro con una risposta cos\u00ec lenta come quella di un filtro analogico di tipo RC, per cui i filtri digitali hanno senso a partire dal secondo ordine in poi.<\/p>\n<p>La descrizione di un filtro ricorsivo del secondo ordine \u00e8 fornita dall&#8217;espressione:<\/p>\n[2]\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techgoggler.com\/it\/wp-content\/ql-cache\/quicklatex.com-20796710876eb451a732bdb38e380c13_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#121;&#40;&#110;&#41;&#61;&#97;&#95;&#123;&#48;&#125;&#120;&#40;&#110;&#41;&#43;&#97;&#95;&#123;&#49;&#125;&#121;&#40;&#110;&#45;&#49;&#41;&#43;&#97;&#95;&#123;&#50;&#125;&#121;&#40;&#110;&#45;&#50;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"410\" style=\"vertical-align: -6px;\"\/><\/p>\n<p>Nella [2], l&#8217;uscita nell&#8217;istante n \u00e8 funzione dell&#8217;ingresso nello stesso istante e dell&#8217;uscita nei due istanti precedenti. Ma l&#8217;uscita nei due istanti precedenti era funzione dell&#8217;ingresso in quegli istanti e delle uscite nei due istanti ancora precedenti. Portando il discorso al limite, si pu\u00f2 concludere che l&#8217;uscita ad un certo istante \u00e8 in qualche modo funzione delle uscite in tutti gli istanti precedenti.<\/p>\n<p>Ragionando in questo modo, possiamo affermare che il filtro ha una risposta all&#8217;impulso infinita, da cui il nome di IIR (Infinite Impulse Response).<\/p>\n<h2>Funzione di trasferimento discreta di un filtro IIR<\/h2>\n<p>La funzione di trasferimento di un filtro IIR del secondo ordine si ottiene, analogamente a quanto visto per i filtri FIR, applicando la trasformata z all&#8217;equazione alle differenze finite e cercando poi il rapporto tra uscita e ingresso nel dominio z.<\/p>\n<p>Applicando la trasformata z alla [2], otteniamo:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techgoggler.com\/it\/wp-content\/ql-cache\/quicklatex.com-39e7839f7897263795f5bec395897176_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#89;&#40;&#122;&#41;&#61;&#97;&#95;&#123;&#48;&#125;&#88;&#40;&#122;&#41;&#43;&#97;&#95;&#123;&#49;&#125;&#89;&#40;&#122;&#41;&#122;&#94;&#123;&#45;&#49;&#125;&#43;&#97;&#95;&#123;&#50;&#125;&#89;&#40;&#122;&#41;&#122;&#94;&#123;&#45;&#50;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"26\" width=\"421\" style=\"vertical-align: -6px;\"\/><\/p>\n<p>da cui la funzione di trasferimento risulter\u00e0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/techgoggler.com\/it\/wp-content\/ql-cache\/quicklatex.com-28ea7812211c4d15f3e3b3d080f4a290_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#71;&#40;&#122;&#41;&#61;&#92;&#102;&#114;&#97;&#99;&#123;&#89;&#40;&#122;&#41;&#125;&#123;&#88;&#40;&#122;&#41;&#125;&#61;&#92;&#102;&#114;&#97;&#99;&#123;&#97;&#95;&#123;&#48;&#125;&#125;&#123;&#49;&#45;&#97;&#95;&#123;&#49;&#125;&#122;&#94;&#123;&#45;&#49;&#125;&#45;&#97;&#95;&#123;&#50;&#125;&#122;&#94;&#123;&#45;&#50;&#125;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"37\" width=\"291\" style=\"vertical-align: -13px;\"\/><\/p>\n<h2>Conclusione<\/h2>\n<p>In un prossimo articolo generalizzeremo la funzione di trasferimento per i filtri IIR e li confronteremo con i filtri FIR.<\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>Parleremo dei filtri ricorsivi Infinite Impulse Response e della loro funzione di trasferimento <a class=\"mh-excerpt-more\" href=\"https:\/\/techgoggler.com\/it\/filtri-ricorsivi-iir\/\" title=\"Filtri ricorsivi (IIR)\"><\/a><\/p>\n<\/div>","protected":false},"author":2,"featured_media":3580,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[262],"class_list":{"0":"post-3574","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-automatica","8":"tag-learning-segnali"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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