1 files changed, 39 insertions, 0 deletions
diff --git a/src/main/java/com/jsyn/unitgen/ImpulseOscillatorBL.java b/src/main/java/com/jsyn/unitgen/ImpulseOscillatorBL.java
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+++ b/src/main/java/com/jsyn/unitgen/ImpulseOscillatorBL.java
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+/*
+ * 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.engine.MultiTable;
+
+/**
+ * Impulse oscillator created by differentiating a sawtoothBL. A band limited impulse is very narrow
+ * but is slightly wider than one sample.
+ * 
+ * @author Phil Burk (C) 2009 Mobileer Inc
+ */
+public class ImpulseOscillatorBL extends SawtoothOscillatorBL {
+    private double previous = 0.0;
+
+    @Override
+    protected double generateBL(MultiTable multiTable, double currentPhase,
+            double positivePhaseIncrement, double flevel, int i) {
+        double saw = multiTable.calculateSawtooth(currentPhase, positivePhaseIncrement, flevel);
+        double result = previous - saw;
+        previous = saw;
+        return result;
+    }
+
+}