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added digital delay line

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This commit is contained in:
Ahmet Inan 2024-04-15 08:33:50 +02:00
parent f664319018
commit 8beb5ccdc5
2 changed files with 31 additions and 2 deletions
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27
app/src/main/java/xdsopl/robot36/Delay.java Normal file
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@ -0,0 +1,27 @@
/*
Digital delay line
Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
*/
package xdsopl.robot36;
public class Delay {
public final int length;
private final float[] buf;
private int pos;
Delay(int length) {
this.length = length;
this.buf = new float[length];
this.pos = 0;
}
float push(float input) {
float tmp = buf[pos];
buf[pos] = input;
if (++pos >= length)
pos = 0;
return tmp;
}
}

6
app/src/main/java/xdsopl/robot36/MainActivity.java
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@ -37,6 +37,7 @@ public class MainActivity extends AppCompatActivity {
private float[] recordBuffer; private float[] recordBuffer;
private AudioRecord audioRecord; private AudioRecord audioRecord;
private TextView status; private TextView status;
private Delay powerDelay;
private SimpleMovingAverage powerAvg; private SimpleMovingAverage powerAvg;
private ComplexMovingAverage syncAvg; private ComplexMovingAverage syncAvg;
private Phasor osc_1200; private Phasor osc_1200;
@ -62,7 +63,7 @@ public class MainActivity extends AppCompatActivity {
private void processSamples() { private void processSamples() {
for (float v : recordBuffer) { for (float v : recordBuffer) {
sad = syncAvg.avg(sad.set(v).mul(osc_1200.rotate())); sad = syncAvg.avg(sad.set(powerDelay.push(v)).mul(osc_1200.rotate()));
float level = sad.norm() / powerAvg.avg(v * v); float level = sad.norm() / powerAvg.avg(v * v);
int x = Math.min((int) (scopeWidth * level), scopeWidth); int x = Math.min((int) (scopeWidth * level), scopeWidth);
for (int i = 0; i < x; ++i) for (int i = 0; i < x; ++i)
@ -79,8 +80,9 @@ public class MainActivity extends AppCompatActivity {
private void initTools(int sampleRate) { private void initTools(int sampleRate) {
double powerWindowSeconds = 0.5; double powerWindowSeconds = 0.5;
int powerWindowSamples = (int) Math.round(powerWindowSeconds * sampleRate); int powerWindowSamples = (int) Math.round(powerWindowSeconds * sampleRate) | 1;
powerAvg = new SimpleMovingAverage(powerWindowSamples); powerAvg = new SimpleMovingAverage(powerWindowSamples);
powerDelay = new Delay((powerWindowSamples - 1) / 2);
double syncPulseSeconds = 0.009; double syncPulseSeconds = 0.009;
int syncPulseSamples = (int) Math.round(syncPulseSeconds * sampleRate); int syncPulseSamples = (int) Math.round(syncPulseSeconds * sampleRate);
syncAvg = new ComplexMovingAverage(syncPulseSamples); syncAvg = new ComplexMovingAverage(syncPulseSamples);