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-rw-r--r--src/com/jsyn/unitgen/PeakFollower.java87
1 files changed, 0 insertions, 87 deletions
diff --git a/src/com/jsyn/unitgen/PeakFollower.java b/src/com/jsyn/unitgen/PeakFollower.java
deleted file mode 100644
index 7bf0508..0000000
--- a/src/com/jsyn/unitgen/PeakFollower.java
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@@ -1,87 +0,0 @@
-/*
- * Copyright 1997 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;
-import com.jsyn.ports.UnitOutputPort;
-import com.jsyn.ports.UnitVariablePort;
-
-/**
- * Tracks the peaks of an input signal. This can be used to monitor the overall amplitude of a
- * signal. The output can be used to drive color organs, vocoders, VUmeters, etc. Output drops
- * exponentially when the input drops below the current output level. The output approaches zero
- * based on the value on the halfLife port.
- *
- * @author (C) 1997-2009 Phil Burk, SoftSynth.com
- */
-public class PeakFollower extends UnitGenerator {
- public UnitInputPort input;
- public UnitVariablePort current;
- public UnitInputPort halfLife;
- public UnitOutputPort output;
-
- private double previousHalfLife = -1.0;
- private double decayScalar = 0.99;
-
- /* Define Unit Ports used by connect() and set(). */
- public PeakFollower() {
- addPort(input = new UnitInputPort("Input"));
- addPort(halfLife = new UnitInputPort(1, "HalfLife", 0.1));
- addPort(current = new UnitVariablePort("Current"));
- addPort(output = new UnitOutputPort("Output"));
- }
-
- @Override
- public void generate(int start, int limit) {
- double[] inputs = input.getValues();
- double[] outputs = output.getValues();
- double currentHalfLife = halfLife.getValues()[0];
- double currentValue = current.getValue();
-
- if (currentHalfLife != previousHalfLife) {
- decayScalar = this.convertHalfLifeToMultiplier(currentHalfLife);
- previousHalfLife = currentHalfLife;
- }
-
- double scalar = 1.0 - decayScalar;
-
- for (int i = start; i < limit; i++) {
- double inputValue = inputs[i];
- if (inputValue < 0.0) {
- inputValue = -inputValue; // absolute value
- }
-
- if (inputValue >= currentValue) {
- currentValue = inputValue;
- } else {
- currentValue = currentValue * scalar;
- }
-
- outputs[i] = currentValue;
- }
-
- /*
- * When current gets close to zero, set current to zero to prevent FP underflow, which can
- * cause a severe performance degradation in 'C'.
- */
- if (currentValue < VERY_SMALL_FLOAT) {
- currentValue = 0.0;
- }
-
- current.setValue(currentValue);
- }
-}