资料介绍
详细说明：DTMF的PDF说明文件，从原理到应用方法进行了详尽的叙述，使人理解双音多频的概念和使用方法-DTMF PDF explanation document, has carried on the exhaustive narration from the principle to the application method, makes the person to understand the double sound multi- frequencies the concept and the application method
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