而不频谱
Without spectrum
以上为机器翻译结果，长、整句建议使用 人工翻译 。
从信号中去除高频信息，降低抽样频率而不导致频谱混叠的过程称之为抽取。
Filtering the high frequency part of the signal and reducing the sampling frequency, which does not produce the aliasing, is called sampling.
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