TRICONEX 8310N2 DCS/分散型控制系统

TRICONEX 8310N2 DCS/分散型控制系统

对于数字系统，频率响应的上限由采样频率。数字系统中样本采样频率的选择基于奈奎斯特-香农采样定理。这表明，只要采样频率大于的两倍，采样信号就可以精确再现带宽的信号奈奎斯特频率。

因此，40 kHz的采样频率在数学上足以捕获频率分量小于或等于20 kHz的信号中包含的所有信息。采样定理还要求在对信号进行采样之前，将奈奎斯特频率以上的频率成分从信号中移除。这是通过使用抗混叠滤波器这需要过渡带以充分减少混叠。

提供的带宽44100赫兹使用的采样频率音频CD的标准宽度足以覆盖整个人类听力范围，大致从20赫兹延伸到20千赫兹。专业数字录音机可以记录更高的频率，而一些消费和电信系统记录更有限的频率范围。

For digital systems, the upper limit of the frequency response is determined by the sampling frequency. The selection of sample sampling frequency in a digital system is based on the Nyquist-Shannon sampling theorem. This shows that as long as the sampling frequency is greater than twice that, the sampled signal can accurately reproduce the signal Nyquist frequency of the bandwidth.

Thus, a sampling frequency of 40 kHz is mathematically sufficient to capture all the information contained in a signal whose frequency component is less than or equal to 20 kHz. The sampling theorem also requires that frequency components above the Nyquist frequency be removed from the signal before it can be sampled. This is done by using an anti-aliasing filter which requires transition bands to sufficiently reduce aliasing.

The bandwidth provided is 44100 Hz. The standard width of an audio CD at the sampling frequency used is enough to cover the entire range of human hearing, extending roughly from 20 Hz to 20 KHZ. Professional digital recorders can record higher frequencies, while some consumer and telecommunications systems record a more limited frequency range.