Mainly include the design of directional multi microphone system, two channel procession circuit, notch filter, squelch, wide dynamic range compression (WDRC) , tone generator.

• 主要包括方向性麦克风系统、双通道信号处理、消除声反馈、消除背景噪声、宽动态压缩、纯音发生器等部分的设计 .