All Forums  GQ Electronics Forums  2.GQ Geiger Muller Counter  Comparison about data charting representation

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Damien68[/i] [br]I post this just for general information, I compare 2 ways to plot a average curve : - The first by convolution with a cardinal sinus, which constitutes a low pass filter (exactly a brick-wall filter). - the second is a moving average (which is a convolution with a rectangle). The first way requires a little more calculation but is still very fast (less than a second for 20,000 points with a Windows PC, .NET framwork, CPU: i5 6th generation) it gives a smoother curve and no less significant The second is more speed but leave artifacts which are due to edge effects with the convolution window edge. below the 2 solutions then an implementation of the LPF filter see more information about sinus cardinal filter at: https://en.wikipedia.org/wiki/Sinc_filter Filtered by a low-pass filter (LPF) with troncated sinus-cardinal window convolution: [b]Image Insert:[/b][br][img]uploaded/Damien68//cv1.jpg[/img][br][size=1] 216998 bytes[/size=1] Filtered by a rectangular window convolution (mobile average) [b]Image Insert:[/b][br][img]uploaded/Damien68//mm2.jpg[/img][br][size=1] 226113 bytes[/size=1] Exemple of sinus cardinal convolution implementation under Visual Basic .NET [b]Image Insert:[/b][br][img]uploaded/Damien68//code3.jpg[/img][br][size=1] 198974 bytes[/size=1] Note: above, function sin (x) must be defined in radians and his calling: [b]Image Insert:[/b][br][img]uploaded/Damien68//Nconv.jpg[/img][br][size=1] 34681 bytes[/size=1] [/quote]    Insert an Image File Check here to include your profile signature.