在FLASH中如何实现Microphone捕获

System.showSettings(2);
//显示指定的 Flash Player“设置”面板
getsound = Microphone.get();
//捕获音频的 Microphone 对象
getsound.setSilenceLevel(0);
//设置应该被视为有声的最小输入级别以及（可选）指示静音已实际启用的静音时间
getsound.setUseEchoSuppression(false);
//是 (true) 否 (false) 应该使用回声抑制。
_root.attachAudio(getsound);
sound_m = new Object();
//循环对象
sound_m.interval = function() {
s = getsound.activityLevel;
//指定摄像机检测的运动量的数值
vod._width = s*5;
vod._height = s*5;
vod._alpha = s;
vod1._width = s*5-5;
vod1._height = s*5-5;
vod1._alpha = s;
vod2._width = s*5-10;
vod2._height = s*5-10;
vod2._alpha = s;
vod3._width = s*5-15;
vod3._height = s*5-15;
vod3._alpha = s;
};
sound_m_n = setInterval(sound_m, "interval", 1);