The apparatus adds a voice module in the main control board, which has signal monitoring function, encoding and decoding function, dialing signal sending function.
本发明所述的装置是在主控板中增加一个语音模块。语音模块具有信号监测功能，编解码功能，拨号信号发送功能。
The module keeps the same volume, its encoding and decoding are implemented by software.
在不增加无线模块体积的前提下，通过软件来实现编解码。
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