描述Chebyshev response.png	English: The frequency response of a Chebyshev pass- through type I fourth-order filter.
来源	自己的作品
作者	Pfalstad
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其他版本	This image, as well as the following text, is derived from Image:Butterworth_response.png.

Generated in gnuplot with the following script (save as cheby.plt and then open in gnuplot):

 

本PNG 位图由n使用Gnuplot创作.

Then I opened the cheby.ps file in a text editor to edit the line colors and linestyles, as per this description archive copy at the Wayback Machine. This avoids needing to open in proprietary software, and really isn't that difficult (especially if you don't know the commands in the proprietary software either).  ;-) Identify the lines easily by their color (the arrow is currently magenta and I want it to be black. Ah, there is the entry with 1 0 1, red + blue = magenta) or by using the gnuplot linestyle−1. (For instance, gnuplot's linestyle 3 corresponds to the ps file's /LT2.) Then you can edit the colors and dashes by hand. I changed the original:

/LT0 { PL [] 1 0 0 DL } def
/LT1 { PL [4 dl 2 dl] 0 1 0 DL } def
/LT2 { PL [2 dl 3 dl] 0 0 1 DL } def
/LT3 { PL [1 dl 1.5 dl] 1 0 1 DL } def

into this:

/LT0 { PL [] 0 0 1 DL } def
/LT1 { PL [4 dl 2 dl] 0.5 0.5 0.5 DL } def
/LT2 { PL [6 dl 3 dl] 0.3 0.3 1 DL } def
/LT3 { PL [] 0 0 0 DL } def

Then I displayed the cheby.ps using the Mac Preview App, and used SnapNDrag to save the useful part of the image to a file.

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• 2006-08-20 21:16 PAR 732×527× (35060 bytes) Added and labelled the minimum passband line and fixed horizontal axis label.
• 2005-08-22 04:27 Pfalstad 732×527× (30199 bytes) {{SelfBSA}}