七段显示译码器 因为计算机输出的是BCD码，要想在数码管上显示十进制数，就必须先把BCD码转换成 7 段字型数码管所要求的代码。我们把能够将计算机输出的BCD码换成 7 段字型代码，并使数码管显示出十进制数的电路称为“七段字型译码器”。 -Seven-segment display decoder because the computer output is BCD code, in order to display in the digital tube decimal numbe

Descr iption: The ability to convert analog signals to digital and vice-versa is very important in signal processing. The objective of an A/D converter is to determine the output digital word corresponding to an analog input signal.

PCM文件：模拟音频信号经模数转换（A/D变换）直接形成的二进制序列，该文件没有附加的文件头和文件结束标志。Windows的Convert工具可以把PCM音频格式的文件转换成Microsoft的WAV格式的文件。-PCM files: analog audio signal by the analog to digital conversion (A/D transformation) direct the formation of binary sequences, it did not at