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数一模转换，将数字信号(二进制)转换成与原信号相似的连续可变(模拟)信号的处理过程。
DIGITAL-TO-ANALOG, the process of converting a digital signal (binary) to a continuously variable (analog) signal that is a close approximation of the original signal.
抽样率是指模拟声音每秒钟被计算机转换成二进制数字的次数。
The sampling rate is the number of times per second analog sound is turned into a binary number by the computer.
设计出了二次调制系统：采用连续可变斜率增量调制（ CV SD）实现模拟话音信号与数字编码的转换，采用二进制相对相移键控（2 DPSK）作为数字调制方式。
A twice modulation is designed:, CVSD was adopted to realize conversion between analog and digital voice signals, 2DPSK was used as the digital modulation mode.
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