1 files changed, 71 insertions, 0 deletions
diff --git a/src/com/jsyn/unitgen/MixerStereoRamped.java b/src/com/jsyn/unitgen/MixerStereoRamped.java
new file mode 100644
index 0000000..6f3bfcc
--- /dev/null
+++ b/src/com/jsyn/unitgen/MixerStereoRamped.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2014 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;
+
+/**
+ * Similar to MixerStereo but the gain, pan and amplitude ports are smoothed using short linear
+ * ramps. So you can control them with knobs and not hear any zipper noise.
+ * 
+ * @author Phil Burk (C) 2014 Mobileer Inc
+ */
+public class MixerStereoRamped extends MixerStereo {
+    private Unzipper[] gainUnzippers;
+    private Unzipper[] panUnzippers;
+    private Unzipper amplitudeUnzipper;
+
+    public MixerStereoRamped(int numInputs) {
+        super(numInputs);
+        gainUnzippers = new Unzipper[numInputs];
+        for (int i = 0; i < numInputs; i++) {
+            gainUnzippers[i] = new Unzipper();
+        }
+        panUnzippers = new Unzipper[numInputs];
+        for (int i = 0; i < numInputs; i++) {
+            panUnzippers[i] = new Unzipper();
+        }
+        amplitudeUnzipper = new Unzipper();
+    }
+
+    @Override
+    public void generate(int start, int limit) {
+        double[] amplitudes = amplitude.getValues(0);
+        double[] outputs0 = output.getValues(0);
+        double[] outputs1 = output.getValues(1);
+        for (int i = start; i < limit; i++) {
+            double sum0 = 0;
+            double sum1 = 0;
+            for (int n = 0; n < input.getNumParts(); n++) {
+                double[] inputs = input.getValues(n);
+                double[] gains = gain.getValues(n);
+                double[] pans = pan.getValues(n);
+
+                PanTracker panTracker = panTrackers[n];
+                double smoothPan = panUnzippers[n].smooth(pans[i]);
+                panTracker.update(smoothPan);
+
+                double smoothGain = gainUnzippers[n].smooth(gains[i]);
+                double scaledInput = inputs[i] * smoothGain;
+                sum0 += scaledInput * panTracker.leftGain;
+                sum1 += scaledInput * panTracker.rightGain;
+            }
+            double amp = amplitudeUnzipper.smooth(amplitudes[i]);
+            outputs0[i] = sum0 * amp;
+            outputs1[i] = sum1 * amp;
+        }
+    }
+
+}