java - Java/Android に 2 つの音声信号を追加する

Question

エコーパッドを自作しようとしているのですが、実はエコー部分までは大丈夫でした

最初は音作りから始めたのですが、とても良かったのですが、エコー効果を追加し始めると馬鹿げた音に聞こえました。

コード

package com.echo;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;

public class WavePlay {

    private final static float duration = 1f; // seconds
    private final static int sampleRate = 44100;
    private final static int numSamples = (int) (duration * sampleRate);
    private final static double sample[] = new double[numSamples];

    private static SourceDataLine line = null;
    private static int freqOfTone = 30;

    private static byte[] original;

    public static void main(String[] args) {

        AudioFormat format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
                sampleRate, 8, 1, 1, sampleRate, true);

        DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);

        try {
            line = (SourceDataLine) AudioSystem.getLine(info);
            line.open(format);
        } catch (LineUnavailableException e) {
            e.printStackTrace();
        }

        for (int i = 0; i < numSamples; ++i) {
            sample[i] = 255 * Math.sin(2 * Math.PI * i
                    / (sampleRate / freqOfTone));

        }

        final byte generatedSnd[] = new byte[100000];

        original = new byte[generatedSnd.length];

        for (int i = 0; i < 20000; i++) {

            generatedSnd[i] = (byte) (sample[i % sample.length] + 1);

            original[i] = generatedSnd[i];

        }

        // Echo

        int delaySamples = 10000;

        float decay = 0.3f;

        for (int j = 0; j < 5; j++) {
            for (int i = 0; i < generatedSnd.length; i++) {

                if (i < delaySamples * (j + 1)) {
                    continue;
                }

                generatedSnd[i] += (byte) (original[i - delaySamples * (j + 1)] * decay);

            }

            decay *= 0.4;
        }

        // play

        InputStream source = new ByteArrayInputStream(generatedSnd);

        int numRead = 0;
        byte[] buf = new byte[line.getBufferSize()];

        line.start();
        // read and play chunks of the audio
        try {
            while ((numRead = source.read(buf, 0, buf.length)) >= 0) {
                int offset = 0;
                while (offset < numRead)
                    offset += line.write(buf, offset, numRead - offset);
            }
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }

        line.drain();
        line.stop();
        line.close();

        System.exit(0);
    }

}

コードを実行して、問題があったかどうか教えてください

事前にどうもありがとう