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| Keywords: Pwm.gif de Pulsweiten-Modulation Own Mik81 en GNU Octave <source lang matlab > GNU Octave / MATLAB Benutzer mik81 de wikipedia org Große Frage Welche amplitude haben die Spektren printf mik81 de wikipedia org\n\n ; printf Spectrum of rectengular waveform\n\n ; stepsPerPeriod 128; 2 8 periods 16; 2 4 steps periods stepsPerPeriod; timebase 0 1 steps-1; size timebase dutycycle 0 05; mkdir /data ; axis labelxy ticxy on ; for count 1 1 40 countString sprintf 03i count ; dutycycle count/80; dutycycleString sprintf 0 3f dutycycle ; realDutycycle 0; set up waveform printf Calculating waveform i\n count ; for period 0 1 periods-1 for step 0 1 stepsPerPeriod-1 if step > dutycycle stepsPerPeriod square square 0 ; if realDutycycle 0 realDutycycle step/stepsPerPeriod dutycycle endif else if period 0 step 0 square +1 ; else square square +1 ; endif endif endfor endfor for step 0 1 steps-1 if step 0 sinus sin 2 pi 0 ; else sinus sinus sin 2 pi step/stepsPerPeriod ; endif endfor sinus 0 1 steps-1; sinus sin 2 pi sinus/stepsPerPeriod ; size sinus size square plot 0 1 steps/ 0 25 periods -1 /stepsPerPeriod square 1 1 steps/ 0 25 periods ;Tastgrad dutycycleString ; ; axis 0 0 25 periods -0 2 +1 2 ; axis nolabel ; axis labely ticxy ; xlabel ; __gnuplot_set__ size 0 42 0 42; print /data/waveform countString png -dpng ; __gnuplot_set__ size 1 1 ; DFT printf Calculating DFT i\n count ; freqSteps steps/2; Frequenz freq Samplerate steps n Fenster remove DC-part square square - sum square 1 ; for freq 0 1 freqSteps pad square sin freq 2 pi timebase/length timebase ; dft 1 freq+1 sum pad 1 ; pad square cos freq 2 pi timebase/length timebase ; cos 2 + sin 2 dft 1 freq+1 dft 1 freq+1 2 + sum pad 1 2; normalize max dft 1 freq+1 normalize ; pad sinus sin freq 2 pi timebase/length timebase ; dftSignal 1 freq+1 sum pad 1 ; pad sinus cos freq 2 pi timebase/length timebase ; cos 2 + sin 2 dftSignal 1 freq+1 dftSignal 1 freq+1 2 + sum pad 1 2; endfor dft sqrt dft ; dft dft/ periods stepsPerPeriod ; dftSignal dftSignal/ periods stepsPerPeriod ; envelop dft 1 1 abs sinc 0 1/10 freqSteps dutycycle ; envelop dft 1 1 abs sinc 0 1/10 freqSteps realDutycycle ; size dft semilogx 0 1 steps-1 /stepsPerPeriod square ; semilogx 1 1 freqSteps-1 /periods dft 2 freqSteps 1 ; plot plot 0 1 freqSteps /periods dft 1 1 freqSteps+1 +1;Spektallinien; 0 1 freqSteps /periods dft 1 1 freqSteps+1 1;; 0 1/10 freqSteps envelop ;Einhuellende; ; dftSelected dft 1 1 ; for selected periods+1 periods freqSteps+1 dftSelected dftSelected dft 1 selected ; endfor size dftSelected size 0 periods+1 periods freqSteps+1 /periods plot 0 periods+1 periods freqSteps+1 /periods-1/periods dftSelected 1 +1;Spektallinien; 0 periods+1 periods freqSteps+1 /periods-1/periods dftSelected 1 1;; 0 1/10 freqSteps envelop ;Einhuellende; ; semilogx 1 1 freqSteps-1 /periods dftSignal 2 freqSteps 1 ; plot 1 1 freqSteps/8-1 /periods dftSignal 2 freqSteps/8 1 ; axis 0 20 0 0 6 ; axis labelxy ticxy on ; xlabel Vielfache der Grundfrequenz ; axis ticx ; print /data/spectrum countString png -dpng ; if freq 8 fetch pad; sum pad 1 dft 1 freq+1 endif plot 0 1 length fetch -1 fetch ;fetch dutycycleString ; ; print /data/fetch countString png -dpng ; endfor </source> Bash/ImageMagick <source lang bash > /bin/bash echo Script of mik81 de wikipedia org vor00 let 1 2 1 0 1 let 1 1 1 00 1 let 1 0 1 000 echo 1 echo vor00 5 i 1 m 40 rm /data/ octave /pulsweite m while i< m ; do case i in composite -gravity East /data/waveform0 i png /data/spectrum0 i png /data/composite0 i png;; composite -gravity East /data/waveform00 i png /data/spectrum00 i png /data/composite00 i png;; break;; esac i i+1 done i 41 m 45 while i<m ; do octave /pulsweite m cp /data/composite040 png /data/composite0 i png i i+1 done convert -delay 25 /data/composite png /pwm gif </source> Cc-zero Pulse width modulation Images with BASH source code Images with Octave source code | ||||
