精选优质文档-倾情为你奉上Unit 9A.1. According to the Nyquist theorem, a signal with a maximum frequency of W Hz (called a band-limited signal) must be sampled at least 2W samples per second to ensure accurate recording.根据奈奎斯特采样定理，为了确保准确记录信号，最高频率为W Hz的信号（称为带限信号），每秒内必须采集至少2W个样本。2. This process begins by converting each digital code into an analog voltage that is proportional in size to the number represented by the code.这个电压值在零阶保持器中保持到下一个码字出现，即需要保持一个采样间隔。3. Depending on the relationship betw
