如何只实时播放麦克风声音输出？

Question

我使用AudioRecord和AudioTrack播放从麦克风到扬声器的声音输出。但是实时播放会产生声音回声。我只需要播放MIC声音而不是播放的声音系统（在这种情况下是第二次播放的MIC AudioTrack）。

            recorder = new AudioRecord(AudioSource.MIC, 44100,
                AudioFormat.CHANNEL_IN_MONO,
                AudioFormat.ENCODING_PCM_16BIT, N * 2);
        track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100,
                AudioFormat.CHANNEL_OUT_MONO,
                AudioFormat.ENCODING_PCM_16BIT, N * 2,
                AudioTrack.MODE_STREAM);

如何在Android中隔离麦克风声音输出并播放它而不播放整个Android声音（在Android设备中播放的其他声音，例如音乐播放器播放的音乐，通知声音等）

PS：在对this stackoverflow qs's comment by hotpaw2 进行一些研究后发现了这条评论：

The latency on most Android devices between record and play is reported to be fairly  high, such that the user would hear a delayed echo unless isolated from any sound going  into the mic.