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点：逢十进一、借一当十，计数用数字“ 0”到“ 9”十个数字。 二进制的特点：逢二进一、借一当二，在二进制中只有“ 0”和“ 1”两个数字。 三、 ASCII码 将字符转换成二进制代码，目前普遍采用的字符编码是 ASC
而符号“ 0”对应于载频 （与 不同的另一载频）的已调波形，而且 与 之间的改变是瞬间完成的。 图 12 2FSK 原理图 下图给出的是用键控法实现 2FSK 信号的电路框图，两个独立的载波发生器的输出受控于输入的二进制信号，按“ 1”或“ 0”分别选择一个载波作为输出。 3 图 13 实现 2FSK 信号的电路框图 二进制相移键控（ PSK）原理 相移键控