When this system needs to playback, data is gotten from RAM, and it transforms into the analog signal through the D/A switch. Moreover through the power amplifier, the voice signal can be recovered.
在需要回放时，再由单片机控制提取RAM中的数据，通过D/A转换器将数字信号转换为模拟信号，通过功率放大器将语音信号还原后回放出来。
The objective now is to convert the analog voice (telephone) signal to a digital signal that may BE transmitted electrically.
现在的目标是将声音(电话)信号转化为可用电来传输的数字信号。
The main difference between these two types is the transmission method of voice : one is transmitted by analog signal and the other uses digital signal.
它们的主要区别在于采用模拟语音传输和数字语音传输。
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