Question

I’m mixing 2 audio bytes arrays getting the mix with some white noise.

for (int i=0;i<bytes1.getB1().length;i++){
        mixBytes[i]=(byte) (bytes1[i]+bytes2[i]);
    }

Anyone knows how to solve the white noise problem ?

I’m getting the bytes with this method, removing the 44 first bytes as wav header.

private byte[] getISByteArray(InputStream is){
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    int length;
    try {
        while ((length = is.read()) != -1) {
            stream.write(length);
        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    byte[] b=stream.toByteArray();
    byte[] b2=new byte[b.length-44];
    //System.arraycopy(b, 44, b2, 0, b2.length);
    for (int i=0;i<b.length;i++){
        if (i>44) b2[i-44]=b[i];
    }
    return b2;  

}

Answer 1

I can see two potential problems immediately:

• You’re treating the inputs as if they were one-byte-per-sample streams. Are they really?
• You’re not doing anything about overflow, which will take two bytes of value 100 and end up with a negative number for example.

For the latter, this might help – although it depends on whether the bytes are really linear amplitude etc, just by taking the average:

mixBytes[i]=(byte) ((bytes1[i]+bytes2[i]) / 2);

I suspect that will make it slightly better, but it’s still not a great mixing function…