xdsopl/robot36
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added frequency markers

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This commit is contained in:
Ahmet Inan 2025-08-20 12:12:34 +02:00
parent 1502f20af1
commit 5e2d28ee7f
1 changed files with 8 additions and 2 deletions
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app/src/main/java/xdsopl/robot36/MainActivity.java
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@ -89,6 +89,8 @@ public class MainActivity extends AppCompatActivity {
private int tintColor; private int tintColor;
private boolean autoSave; private boolean autoSave;
private boolean showSpectrogram; private boolean showSpectrogram;
private final int binWidthHz = 10;
private final int[] freqMarkers = { 1100, 1300, 1500, 2300 };
private void setStatus(int id) { private void setStatus(int id) {
setTitle(id); setTitle(id);
@ -223,8 +225,12 @@ public class MainActivity extends AppCompatActivity {
double lowest = Math.log(1e-9); double lowest = Math.log(1e-9);
double highest = Math.log(1); double highest = Math.log(1);
double range = highest - lowest; double range = highest - lowest;
int minFreq = 140;
int minBin = minFreq / binWidthHz;
for (int i = 0; i < stride; ++i) for (int i = 0; i < stride; ++i)
waterfallPlotBuffer.pixels[line + i] = rainbow((Math.log(stft.power[i + 14]) - lowest) / range); waterfallPlotBuffer.pixels[line + i] = rainbow((Math.log(stft.power[i + minBin]) - lowest) / range);
for (int freq : freqMarkers)
waterfallPlotBuffer.pixels[line + (freq - minFreq) / binWidthHz] = 0;
System.arraycopy(waterfallPlotBuffer.pixels, line, waterfallPlotBuffer.pixels, line + stride * (waterfallPlotBuffer.height / 2), stride); System.arraycopy(waterfallPlotBuffer.pixels, line, waterfallPlotBuffer.pixels, line + stride * (waterfallPlotBuffer.height / 2), stride);
} }
} }
@ -315,7 +321,7 @@ public class MainActivity extends AppCompatActivity {
if (rateChanged) { if (rateChanged) {
decoder = new Decoder(scopeBuffer, imageBuffer, getString(R.string.raw_mode), recordRate); decoder = new Decoder(scopeBuffer, imageBuffer, getString(R.string.raw_mode), recordRate);
decoder.setMode(currentMode); decoder.setMode(currentMode);
stft = new ShortTimeFourierTransform(recordRate / 10, 3); stft = new ShortTimeFourierTransform(recordRate / binWidthHz, 3);
} }
startListening(); startListening();
} else { } else {