diff options
| -rw-r--r-- | src/main/java/com/jsyn/unitgen/SchmidtTrigger.java | 9 | ||||
| -rw-r--r-- | src/main/java/com/jsyn/unitgen/WaveFolder.java | 83 |
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 > 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; + } + } + +} |