audiotrack：如何消除背景噪音？

Question

我有两个属性为44khz，立体声通道和16位的wav文件。我试图在android中使用audiotrack混合它们。我能够混合它们。但我在玩的时候会发出声响。如何消除噪音。

以下是我的代码：

        int frequency = 44100;
        int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_STEREO;
        int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;

        int minbufferSize = AudioTrack.getMinBufferSize(frequency, channelConfiguration,audioEncoding);

        AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, frequency,
                channelConfiguration, audioEncoding, minbufferSize,
                AudioTrack.MODE_STREAM);

        int bufferSize = 512;

        int count = 0;
        int count2 = 0;
        byte[] data = new byte[bufferSize];
        byte[] data2 = new byte[bufferSize];
        byte[] data3 = new byte[bufferSize];

        try{
            FileInputStream fileInputStream = new FileInputStream("/sdcard/file1.wav");
            DataInputStream dataInputStream = new DataInputStream(fileInputStream);

            FileInputStream fileInputStream2 = new FileInputStream("/sdcard/file2.wav");
            DataInputStream dataInputStream2 = new DataInputStream(fileInputStream2);


            audioTrack.play();

            while((count = dataInputStream.read(data, 0, bufferSize)) > -1 && (count2 = dataInputStream2.read(data2, 0, bufferSize)) > -1){

                for (int i=0;i<data3.length;i++){

                    float samplef1 = (data[i] / 128.0f);
                    float samplef2 = (data2[i] / 128.0f);

                    float mixed = samplef1 + samplef2;

                    // reduce the volume a bit:
                    mixed *= 0.9;

                    // hard clipping
                    if (mixed > 1.0f) mixed = 1.0f;

                    if (mixed < -1.0f) mixed = -1.0f;

                    byte outputSample = (byte) (mixed * 128.0f);
                    data3[i] = outputSample;
                }
                audioTrack.write(data3, 0, count);
            }

            L.m("Thread completed");

            audioTrack.stop();
            audioTrack.release();
            dataInputStream.close();
            fileInputStream.close();
        }
        catch (FileNotFoundException e){
            e.printStackTrace();
            rawaudioisRunning = false;
        } catch (IOException e) {
            e.printStackTrace();
            rawaudioisRunning = false;
        }