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align sync pulses with scan line

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This commit is contained in:
Ahmet Inan 2024-04-16 10:40:57 +02:00
parent 3ae7e18df3
commit fee4012c6a
1 changed files with 12 additions and 8 deletions
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20
app/src/main/java/xdsopl/robot36/MainActivity.java
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@ -37,7 +37,8 @@ public class MainActivity extends AppCompatActivity {
private float[] recordBuffer;
private AudioRecord audioRecord;
private TextView status;
private Delay powerDelay;
private Delay syncPulseDelay;
private Delay scanLineDelay;
private SimpleMovingAverage powerAvg;
private ComplexMovingAverage syncPulseFilter;
private ComplexMovingAverage scanLineFilter;
@ -74,8 +75,8 @@ public class MainActivity extends AppCompatActivity {
baseBand = baseBandLowPass.avg(baseBand.set(v).mul(baseBandOscillator.rotate()));
syncPulse = syncPulseFilter.avg(syncPulse.set(baseBand).mul(syncPulseOscillator.rotate()));
scanLine = scanLineFilter.avg(scanLine.set(baseBand).mul(scanLineOscillator.rotate()));
float syncPulseValue = powerDelay.push(syncPulse.norm()) / powerAvg.avg(baseBand.norm());
float scanLineValue = scanLineDemod.demod(scanLine);
float syncPulseValue = syncPulseDelay.push(syncPulse.norm()) / powerAvg.avg(baseBand.norm());
float scanLineValue = scanLineDelay.push(scanLineDemod.demod(scanLine));
float syncPulseLevel = Math.min(Math.max(syncPulseValue, 0), 1);
float scanLineLevel = Math.min(Math.max(0.5f * (scanLineValue + 1), 0), 1);
int syncPulseIntensity = (int) Math.round(255 * Math.sqrt(syncPulseLevel));
@ -103,17 +104,16 @@ public class MainActivity extends AppCompatActivity {
double powerWindowSeconds = 0.5;
int powerWindowSamples = (int) Math.round(powerWindowSeconds * sampleRate) | 1;
powerAvg = new SimpleMovingAverage(powerWindowSamples);
powerDelay = new Delay((powerWindowSamples - 1) / 2);
float blackFrequency = 1500;
float whiteFrequency = 2300;
float scanLineBandwidth = whiteFrequency - blackFrequency;
scanLineDemod = new FrequencyModulation(scanLineBandwidth, sampleRate);
float scanLineCutoff = scanLineBandwidth / 2;
int scanLineSamples = (int) Math.round(0.443 * sampleRate / scanLineCutoff) | 1;
scanLineFilter = new ComplexMovingAverage(scanLineSamples);
int scanLineFilterSamples = (int) Math.round(0.443 * sampleRate / scanLineCutoff) | 1;
scanLineFilter = new ComplexMovingAverage(scanLineFilterSamples);
double syncPulseSeconds = 0.009;
int syncPulseSamples = (int) Math.round(syncPulseSeconds * sampleRate);
syncPulseFilter = new ComplexMovingAverage(syncPulseSamples);
int syncPulseFilterSamples = (int) Math.round(syncPulseSeconds * sampleRate) | 1;
syncPulseFilter = new ComplexMovingAverage(syncPulseFilterSamples);
float lowestFrequency = 1100;
float highestFrequency = 2300;
float cutoffFrequency = (highestFrequency - lowestFrequency) / 2;
@ -125,6 +125,10 @@ public class MainActivity extends AppCompatActivity {
syncPulseOscillator = new Phasor(-(syncPulseFrequency - centerFrequency), sampleRate);
float grayFrequency = (blackFrequency + whiteFrequency) / 2;
scanLineOscillator = new Phasor(-(grayFrequency - centerFrequency), sampleRate);
int syncPulseDelaySamples = (powerWindowSamples - 1) / 2;
syncPulseDelay = new Delay(syncPulseDelaySamples);
int scanLineDelaySamples = (powerWindowSamples - 1) / 2 + (syncPulseFilterSamples - 1) / 2 - (scanLineFilterSamples - 1) / 2;
scanLineDelay = new Delay(scanLineDelaySamples);
baseBand = new Complex();
syncPulse = new Complex();
scanLine = new Complex();