Butterworth Filter

Butterworth Filter

EN : The Butterworth filter (or “maximally flat”) is one of the simplest electronic filters. Its purpose is to obtain a frequency response of the flat as possible in the passband. Applied to the retail price index aims to filter out the “noise” and give you an indication on the direction of the more readable price.

IT: Filtro di Butterworth Il filtro Butterworth (o “massimamente piatto”) è uno dei più semplici filtri elettronici. Il suo scopo è ottenere una risposta in frequenza il più possibile piatta nella banda passante. Applicato all’evoluzione dei prezzi mira a filtrare il “rumore di fondo” e dare un indicazione sulla direzione del prezzo più leggibile.

 

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  1. Fabio Anthony Terrenzio • 09/07/2016 #

    Volendo aumentare l’effetto filtrante, quali parametri dovrei modificare?

    • StefanoCG • 09/07/2016 #

      puoi sostituire nella riga  di comando 
      Butterworth = Butterworth[1] - (Butterworth[2] / 3.414) + Close * ( 1 /3.414)quest\'altra
      Butterworth = Butterworth[1] - (Butterworth[2] / 3.414) + Close * ( G /3.414)G = numeri interi da 1 in su

    • Fabio Anthony Terrenzio • 09/07/2016 #

      Con G == 2 —> (2 / 3.414)…. la linea sparisce

    • Fabio Anthony Terrenzio • 09/07/2016 #

      La formula corretta per accentuare il filtro tramite parametro G è:
      Butterworth = Butterworth[1] – (Butterworth[2] / (G*3.414)) + Close * ( 1 /(G*3.414))

    • Nicolas • 09/07/2016 #

      Do I need to change the code accordingly to your formula?

    • Fabio Anthony Terrenzio • 09/07/2016 #

      Good idea

  2. StefanoCG • 09/07/2016 #

    ciao Fabio … non hai mica tutti i torti … la notte bisognerebbe dormire per non scrivere baggianate 🙂 
    // ---------------------------------------------------------------------
    // Filtro di Butterworth
    // -------------------------- VARIABILI
    //G = 1 default
    // ---------------------------------------------------------------------
    IF BarIndex < 2 THEN
    Butterworth = Close
    ELSE
    Butterworth = Butterworth[1] - (Butterworth[2] / (G*3.414)) + Close * ( 1 /(G*3.414))
    ENDIF

    RETURN Butterworth AS \"Filtro di Butterworth \"
    // ---------------------------------------------------------------------
     

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