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-rw-r--r--src/main/java/com/jsyn/unitgen/SchmidtTrigger.java9
-rw-r--r--src/main/java/com/jsyn/unitgen/WaveFolder.java83
2 files changed, 87 insertions, 5 deletions
diff --git a/src/main/java/com/jsyn/unitgen/SchmidtTrigger.java b/src/main/java/com/jsyn/unitgen/SchmidtTrigger.java
index 64129ff..c421d5d 100644
--- a/src/main/java/com/jsyn/unitgen/SchmidtTrigger.java
+++ b/src/main/java/com/jsyn/unitgen/SchmidtTrigger.java
@@ -4,9 +4,9 @@
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
- *
+ *
* http://www.apache.org/licenses/LICENSE-2.0
- *
+ *
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -27,7 +27,7 @@ import com.jsyn.ports.UnitOutputPort;
* signal. The default values for setLevel and resetLevel are both 0.0. Setting setLevel to 0.1 and
* resetLevel to -0.1 will give some hysteresis. The outputPulse is a single sample wide pulse set
* when the output transitions from low to high.
- *
+ *
* <PRE>
* if (output == 0.0)
* output = (input &gt; setLevel) ? 1.0 : 0.0;
@@ -36,7 +36,7 @@ import com.jsyn.ports.UnitOutputPort;
* else
* output = previous_output;
* </PRE>
- *
+ *
* @author Phil Burk (C) 2009 Mobileer Inc
* @see Compare
*/
@@ -49,7 +49,6 @@ public class SchmidtTrigger extends UnitFilter {
public SchmidtTrigger() {
addPort(setLevel = new UnitInputPort("SetLevel"));
addPort(resetLevel = new UnitInputPort("ResetLevel"));
- addPort(input = new UnitInputPort("Input"));
addPort(outputPulse = new UnitOutputPort("OutputPulse"));
}
diff --git a/src/main/java/com/jsyn/unitgen/WaveFolder.java b/src/main/java/com/jsyn/unitgen/WaveFolder.java
new file mode 100644
index 0000000..ed9ead7
--- /dev/null
+++ b/src/main/java/com/jsyn/unitgen/WaveFolder.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2009 Phil Burk, Mobileer Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jsyn.unitgen;
+
+import com.jsyn.ports.UnitInputPort;
+
+/**
+ * Wave Folder
+ *
+ * Fold the input waveform by passing it through a sine function
+ * and output the results in the range of -1.0 to 1.0.
+ *
+ * This works best if the amplitude of the input waveform is close to 1.0.
+ *
+ * @author Phil Burk (C) 2020 Mobileer Inc
+ */
+public class WaveFolder extends UnitFilter
+{
+ /**
+ * The depth of the wave-folding effect.
+ * At zero there should be no audible effect.
+ */
+ public UnitInputPort amount;
+ private static final double MAX_SCALE = 8.0;
+
+ /* Define Unit Ports used by connect() and set(). */
+ public WaveFolder() {
+ addPort(amount = new UnitInputPort("Amount"));
+ amount.setup(0.0, 0.0, MAX_SCALE);
+ }
+
+ @Override
+ public void generate( int start, int limit )
+ {
+ double[] inputs = input.getValues();
+ double[] scales = amount.getValues();
+ double[] outputs = output.getValues();
+
+ for (int i = start; i < limit; i++) {
+ double inputValue = inputs[i];
+ double scaleValue = scales[i];
+
+ // Prevent blowup near zero.
+ scaleValue = Math.max(scaleValue, 0.00001);
+ double phase = inputValue * scaleValue;
+
+ double folded;
+// if (true) {
+ // Clip to -1/+1 range for fastSin even for extreme ranges.
+ phase = (phase + 256.0 + 1.0) * 0.5;
+ phase -= Math.floor(phase);
+ phase = (phase * 2.0) - 1.0;
+
+ // Fold using a sine function that ranges -1 to +1.
+ folded = SineOscillator.fastSin(phase);
+// } else {
+// folded = Math.sin(phase * Math.PI); // slow
+// }
+
+ // Try to maintain constant amplitude at small scale value.
+ // Based on sin(x) ~= x for low values of x.
+ if (scaleValue < 1.0) {
+ folded /= scaleValue * (((1 - Math.PI) * scaleValue) + Math.PI);
+ }
+ outputs[i] = folded;
+ }
+ }
+
+}