Android Open Source - voicesmith Phase Accumulator

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From Project

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Voicesmith <http://voicesmith.jurihock.de/>
 */*w w  w.j  a v  a  2s.  co  m*/
 * Copyright (c) 2011-2014 Juergen Hock
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package de.jurihock.voicesmith.io.oscillators;

import static de.jurihock.voicesmith.dsp.Math.PI;
import android.content.Context;
import de.jurihock.voicesmith.io.AudioDevice;

public abstract class PhaseAccumulator extends AudioDevice
{
  private float  phaseDeviation;
  private float  phaseDivisor;

  public PhaseAccumulator(Context context, int frequency)
  {
    super(context);

    this.setWaveFrequency(frequency);
  }

  public PhaseAccumulator(Context context, int sampleRate, int waveFrequency)
  {
    super(context, sampleRate);

    this.setWaveFrequency(waveFrequency);
  }

  private int  waveFrequency;

  public int getWaveFrequency()
  {
    return waveFrequency;
  }

  private void setWaveFrequency(int waveFrequency)
  {
    this.waveFrequency = waveFrequency;

    phaseDeviation = getWaveFrequency() / getSampleRate();
    phaseDivisor = -phaseDeviation;
  }

  protected float getNextPhase()
  {
    phaseDivisor += phaseDeviation;

    while(phaseDivisor >= 1)
      phaseDivisor -= 1;

    return 2 * PI * phaseDivisor;
  }

  @Override
  public void flush()
  {
    phaseDivisor = -phaseDeviation;
  }
}

Java Source Code List

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