在区域控制单元中，分别介绍了处理单元、输入信号检测、看门狗电路、通信扩展的设计。
Also many design methods are put forward when introducing of the area part, such as processing unit, input signal detection, watch dog circuit, extended communication and so on.
控制单元将各子区域背景声音信号电平与各对应设置的子区域报警阈值电平比较，在某子区域背景声音信号电平大于该子区域所设置的报警阈值电平时控制告警。
Modulator mixes point sound signal output by its subordinate multiple detectors to background sound in the sub area and sends it to control unit to realize background sound reproduction.
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