数字信号处理中标准的频谱分析方法是离散傅立叶变换（DFT），典型的实现方法是快速傅立叶变换（FFT）。
The standard method for spectrum analysis in digital signal processing is the discrete Fourier transform(DFT), typically implemented using a fast Fourier transform(FFT) algorithm.
拟信号被转换为数字信号，并用DVD压缩标准压缩，然后传递到DVD上储存起来。
Analog signal is converted to a digital signal and compressed using DVD compression standards, then stored for transfer onto the DVD.
若要对模拟电视信号启用播放，卫星电视接收器需要将数字信号转换为标准电视可以识别和播放的模拟格式。
To enable playback on an analog TV signal, the satellite TV receiver converts the digital signal into an analog format that a standard television can recognize and playback.
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