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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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 org.drrickorang.loopback;
/**
* This class generates a mix of two sine waves with frequency1, frequency2, and samplingRate.
* It keeps two member variable "mPhase1" and "mPhase2", so as it continually be called,
* it will continue to generate the next section of the sine wave.
*/
public class TwoSineWavesTone extends ToneGeneration {
private int mCount; // counts the total samples produced.
private double mPhase1; // current phase associated with mFrequency1
private double mPhase2; // current phase associated with mFrequency2
private final double mPhaseIncrement1; // phase incrementation associated with mFrequency1
private final double mPhaseIncrement2; // phase incrementation associated with mFrequency2
/**
* Currently, this class is never used, but it can be used in the future to create a different
* kind of wave when running the test.
*/
public TwoSineWavesTone(int samplingRate, double frequency1, double frequency2) {
super(samplingRate);
mCount = 0;
mPhaseIncrement1 = Constant.TWO_PI * (frequency1 / mSamplingRate); // should < 2pi
mPhaseIncrement2 = Constant.TWO_PI * (frequency2 / mSamplingRate); // should < 2pi
mAmplitude = Constant.TWO_SINE_WAVES_AMPLITUDE;
}
@Override
public void generateTone(short[] tone, int size) {
for (int i = 0; i < size; i++) {
short value1 = (short) (mAmplitude * Math.sin(mPhase1) * Short.MAX_VALUE);
short value2 = (short) (mAmplitude * Math.sin(mPhase2) * Short.MAX_VALUE);
tone[i] = (short) (value1 + value2);
mPhase1 += mPhaseIncrement1;
mPhase2 += mPhaseIncrement2;
// insert glitches for every second if mIsGlitchEnabled == true.
if (mIsGlitchEnabled & (mCount % mSamplingRate == 0)) {
mPhase1 += mPhaseIncrement1;
mPhase2 += mPhaseIncrement2;
}
mCount++;
if (mPhase1 > Constant.TWO_PI) {
mPhase1 -= Constant.TWO_PI;
}
if (mPhase2 > Constant.TWO_PI) {
mPhase2 -= Constant.TWO_PI;
}
}
}
@Override
public void generateTone(double[] tone, int size) {
for (int i = 0; i < size; i++) {
double value1 = mAmplitude * Math.sin(mPhase1);
double value2 = mAmplitude * Math.sin(mPhase2);
tone[i] = value1 + value2;
mPhase1 += mPhaseIncrement1;
mPhase2 += mPhaseIncrement2;
// insert glitches if mIsGlitchEnabled == true, and insert it for every second
if (mIsGlitchEnabled & (mCount % mSamplingRate == 0)) {
mPhase1 += mPhaseIncrement1;
mPhase2 += mPhaseIncrement2;
}
mCount++;
if (mPhase1 > Constant.TWO_PI) {
mPhase1 -= Constant.TWO_PI;
}
if (mPhase2 > Constant.TWO_PI) {
mPhase2 -= Constant.TWO_PI;
}
}
}
@Override
public void resetPhases() {
mPhase1 = 0;
mPhase2 = 0;
}
}
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