Swedish adaptation: Instegscertifikat and HAREC content

- Sections and slides rewritten in Swedish; German law and institutions replaced by
  Swedish/CEPT/ITU equivalents (PTS, SSA, PTSFS 2025:1, SSMFS 2008:18), unverified
  statements marked "% TODO VERIFY"
- New toc: INSTEG, HAREC, UPPGRADERING; section idents are Swedish (see ident-map.tsv)
- Exam-question tags, BNetzA question pool, solutions and the German SWL course removed
- Static pages, snippets, applets, READMEs and image alt-texts translated
- TikZ labels translated; SVG drawings regenerated (drawing 689 still fails to build
  upstream: it references a missing photo)
- Changed from the original: not endorsed by DARC e.V., SSA or PTS

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

contents/html/applet_nyquist.html

@@ -129,9 +129,9 @@
       <!-- Controls -->
       <div class="controls">
         <div class="control-row">
-          <span class="control-label">Abtastrate $f_\text{s}$:</span>
+          <span class="control-label">Samplingsfrekvens $f_\text{s}$:</span>
           <input type="range" id="sliderFs" min="1.0" max="8.0" step="0.025" value="3.0">
-          <span class="control-value" id="labelFs">3.0 kHz</span>
+          <span class="control-value" id="labelFs">3,0 kHz</span>
         </div>
       </div>
 
@@ -139,7 +139,7 @@
       <div class="panel">
         <div class="panel-label">
           <span class="dot" style="background:var(--signal-color)"></span>
-          Originalsignal — Sinus mit 1kHz
+          Originalsignal — sinus på 1 kHz
         </div>
         <canvas id="canvasOriginal" height="300"></canvas>
       </div>
@@ -148,7 +148,7 @@
       <div class="panel">
         <div class="panel-label">
           <span class="dot" style="background:var(--sample-color)"></span>
-          Abgetastetes Signal
+          Samplad signal
         </div>
         <canvas id="canvasSampled" height="300"></canvas>
       </div>
@@ -157,15 +157,15 @@
       <div class="panel">
         <div class="panel-label">
           <span class="dot" style="background:var(--recon-color)"></span>
-          Rekonstruiertes Signal 
+          Rekonstruerad signal 
         </div>
         <canvas id="canvasRecon" height="300"></canvas>
       </div>
 
       <!-- Info box -->
       <div class="info-box" id="infoBox">
-        <strong>✓ Nyquist-Bedingung erfüllt:</strong>
-        f<sub>s</sub> = 3.0 kHz ≥ 2 · 1 kHz. Das rekonstruierte Signal stimmt mit dem Original überein.
+        <strong>✓ Nyquistvillkoret är uppfyllt:</strong>
+        f<sub>s</sub> = 3,0 kHz ≥ 2 · 1 kHz. Den rekonstruerade signalen stämmer överens med originalet.
       </div><br>
     </div>
   </div>
@@ -173,13 +173,13 @@
 
 <script>
 // ============================================================
-//  Signal- und Darstellungsparameter
+//  Signal- och visningsparametrar
 // ============================================================
-const F_SIG   = 1.0;   // Signalfrequenz (normiert auf 1)
-const T_SHOW  = 3.0;   // Angezeigte Zeitdauer in Perioden
-const N_DRAW  = 1000;  // Stützpunkte für analoge Kurve
+const F_SIG   = 1.0;   // signalfrekvens (normerad till 1)
+const T_SHOW  = 3.0;   // visad tidslängd i perioder
+const N_DRAW  = 1000;  // punkter för den analoga kurvan
 
-// Sinc-Funktion (normierte Version: sinc(u) = sin(πu)/(πu))
+// sinc-funktion (normerad version: sinc(u) = sin(πu)/(πu))
 function sinc(u) {
   if (Math.abs(u) < 1e-10) return 1.0;
   return Math.sin(Math.PI * u) / (Math.PI * u);
@@ -190,7 +190,7 @@ function signal(t) {
   return Math.sin(2 * Math.PI * F_SIG * t);
 }
 
-// Whittaker-Shannon-Rekonstruktion
+// Whittaker–Shannon-rekonstruktion
 function reconstruct(t, samples, fs) {
   let sum = 0;
   for (let n = 0; n < samples.length; n++) {
@@ -200,7 +200,7 @@ function reconstruct(t, samples, fs) {
 }
 
 // ============================================================
-//  Canvas-Hilfsklasse
+//  Hjälpklass för canvas
 // ============================================================
 class Plot {
   constructor(canvas, yMin=-1.3, yMax=1.3) {
@@ -325,7 +325,7 @@ class Plot {
 }
 
 // ============================================================
-//  Globale Plot-Objekte
+//  Globala plotobjekt
 // ============================================================
 let plotOrig, plotSamp, plotRecon;
 
@@ -336,11 +336,11 @@ function initPlots() {
 }
 
 // ============================================================
-//  Haupt-Render-Funktion
+//  Huvudfunktion för rendering
 // ============================================================
 function render(fs) {
-  // --- 1. Abtastwerte erzeugen ---
-  const Ts = 1 / fs;  // Abtastintervall (in Perioden des Signals)
+  // --- 1. Skapa samplingsvärden ---
+  const Ts = 1 / fs;  // samplingsintervall (i signalperioder)
   const nSamples = Math.floor(T_SHOW * fs) + 2;
   const samples = [];
   for (let n = 0; n < nSamples; n++) {
@@ -348,81 +348,84 @@ function render(fs) {
     samples.push({ t, y: signal(t) });
   }
 
-  // --- 2. Analoge Kurve erzeugen ---
+  // --- 2. Skapa analog kurva ---
   const analogPts = [];
   for (let i = 0; i <= N_DRAW; i++) {
     const t = (i / N_DRAW) * T_SHOW;
     analogPts.push({ t, y: signal(t) });
   }
 
-  // --- 3. Rekonstruktion (Sinc-Interpolation) ---
+  // --- 3. Rekonstruktion (sinc-interpolation) ---
   const reconPts = [];
   for (let i = 0; i <= N_DRAW; i++) {
     const t = (i / N_DRAW) * T_SHOW;
     reconPts.push({ t, y: reconstruct(t, samples, fs) });
   }
 
-  // --- 4. Panel 1: Original ---
+  // --- 4. Panel 1: original ---
   plotOrig.clear();
   plotOrig.drawLine(analogPts, '#47ABE8', 2.2);
 
-  // --- 5. Panel 2: Samples (analog + stems) ---
+  // --- 5. Panel 2: samplingar (analog + stolpar) ---
   plotSamp.clear();
-  plotSamp.drawLine(analogPts, '#47ABE8', 1.5); // leicht gedämpft im Hintergrund
+  plotSamp.drawLine(analogPts, '#47ABE8', 1.5); // svagt dämpad i bakgrunden
   plotSamp.drawStems(samples, '#FE756C');
 
-  // --- 6. Panel 3: Rekonstruktion ---
+  // --- 6. Panel 3: rekonstruktion ---
   const nyquistOk = fs >= 2 * F_SIG;
   const reconColor = nyquistOk ? '#3BB583' : '#FE756C';
   plotRecon.clear();
-  // Original als gestrichelte Referenz
+  // Original som streckad referens
   const ctx = plotRecon.ctx;
   ctx.save();
   ctx.setLineDash([5, 5]);
   plotRecon.drawLine(analogPts, '#47ABE8', 1.2);
   ctx.setLineDash([]);
   ctx.restore();
-  // Rekonstruiertes Signal
+  // Rekonstruerad signal
   plotRecon.drawLine(reconPts, reconColor, 2.2);
 
-  // --- 7. UI-Updates ---
+  // --- 7. UI-uppdateringar ---
   updateUI(fs, nyquistOk);
 }
 
+// decimalkomma i visade värden
+function sv(s) { return String(s).replace(".", ","); }
+
 function updateUI(fs, ok) {
   const infoBox   = document.getElementById('infoBox');
 
   const ratio     = (fs / F_SIG).toFixed(2);
-  const fAlias    = Math.abs(fs - F_SIG).toFixed(2);  // Aliasing-Frequenz (vereinfacht)
+  const fAlias    = Math.abs(fs - F_SIG).toFixed(2);  // aliasfrekvens (förenklad)
 
 
   if (ok) {
     infoBox.style.borderLeftColor = '#1565c0';
     infoBox.style.background = '#DAEEFA';
     infoBox.innerHTML =
-      `<strong>✓ Nyquist-Bedingung erfüllt:</strong> ` +
-      `f<sub>s</sub> = ${fs.toFixed(2)} kHz ≥ 2 · ${F_SIG} kHz = ${(2*F_SIG).toFixed(2)} kHz. ` +
-      `Das rekonstruierte Signal stimmt mit dem Original überein.`;
+      `<strong>✓ Nyquistvillkoret är uppfyllt:</strong> ` +
+      `f<sub>s</sub> = ${sv(fs.toFixed(2))} kHz ≥ 2 · ${sv(String(F_SIG))} kHz = ${sv((2*F_SIG).toFixed(2))} kHz. ` +
+      `Den rekonstruerade signalen stämmer överens med originalet.`;
   } else {
     infoBox.style.borderLeftColor = '#c62828';
     infoBox.style.background = '#FFE3E2';
     infoBox.innerHTML =
-      `<strong>⚠ Aliasing:</strong> f<sub>s</sub> = ${fs.toFixed(2)} kHz < 2 · ${F_SIG} kHz. ` +
-      `Das rekonstruierte Signal erscheint mit Aliasing-Frequenz ` +
-      `f<sub>Alias</sub> = |f<sub>s</sub> − f<sub>Signal</sub>| ≈ ${fAlias} kHz. ` +
-      `Erhöhe die Abtastrate über ${(2*F_SIG).toFixed(1)} kHz, um das Signal korrekt darzustellen.`;
+      `<strong>⚠ Aliasing:</strong> f<sub>s</sub> = ${sv(fs.toFixed(2))} kHz < 2 · ${sv(String(F_SIG))} kHz. ` +
+      `Den rekonstruerade signalen uppträder med aliasfrekvensen ` +
+      `f<sub>alias</sub> = |f<sub>s</sub> − f<sub>signal</sub>| ≈ ${sv(fAlias)} kHz. ` +
+      `Öka samplingsfrekvensen över ${sv((2*F_SIG).toFixed(1))} kHz för att återge signalen korrekt.`;
   }
 }
 
 // ============================================================
-//  Event-Listener & Init
+//  Händelselyssnare och init
 // ============================================================
 const slider  = document.getElementById('sliderFs');
 const labelFs = document.getElementById('labelFs');
 
 slider.addEventListener('input', () => {
   const fs = parseFloat(slider.value);
-  labelFs.textContent = fs.toFixed(2) + ' kHz';
+  labelFs.textContent = sv(fs.toFixed(2)) + ' kHz';
   render(fs);
 });
 
@@ -436,11 +439,11 @@ function onResize() {
 
 window.addEventListener('resize', onResize);
 
-// Erst nach dem Laden initialisieren, wenn Canvas-Dimensionen bekannt sind
+// Initiera först efter laddning, när canvasdimensionerna är kända
 window.addEventListener('load', () => {
   initPlots();
   const fs = parseFloat(slider.value);
-  labelFs.textContent = fs.toFixed(2) + ' kHz';
+  labelFs.textContent = sv(fs.toFixed(2)) + ' kHz';
   render(fs);
 });
 </script>