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          • Term
            • aliasing
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          • Definition(s)
            • In any technology or process involving (a) sampling a signal, e.g., an electrical signal or (a series of images of) a moving subject; (b) processing, storing, or transmitting representations of the samples; and (c) replicating the original signal from the representations: the production of artifacts as a result of sampling at intervals too great to permit faithful replication of the original signal. ATIS Telecom Glossary 2007
          • Example sentence(s)
            • Digital alias-free signal processing (DASP) is a technique for overcoming the problems of aliasing at extended frequency ranges. Based on non-uniform or randomised sampling techniques and the development of novel algorithms, it creates the capacity to suppress potential aliasing crucial for high frequency applications and to reduce the complexity of designs. - Wiley
            • An example of aliasing can be seen in old movies, especially when watching wagon wheels on old Western films. Recall that occasionally the wheels appeared as if they going in reverse, even as the wagon would speed up. This phenomenon occurs as the rate of the wagon wheel's spokes spinning approaches the rate of the sampler (the camera operating at about 30 frames per second). - National Instruments
            • The term aliasing refers to the distortion that occurs when a continuous time signal has frequencies larger than half of the sampling rate. The process of aliasing describes the phenomenon in which components of the signal at high frequencies are mistaken for components at lower frequencies. - Sampling and Aliasing
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    • Chinese
      • Telecom(munications)
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          • Term
            • 混叠
          • Additional fields of expertise
          • Definition(s)
            • 混叠（Aliasing）是当信号的取样频率低于奈奎斯特（Nyquist）频率时所出现的一种信号失真现象。 网络大典 - by Frank Wang
          • Example sentence(s)
            • 在视频采样系统里我们很容易可以解释什么是混叠——用电影来说明：如果你留意过电影里的车轮，会发现车轮有时像在倒过来转，这时候我们看到的就是混叠现象。因为电影的胶片采样速度远远不及车轮的转速，于是我们的眼睛就会产生错觉。根据Nyquist理论，当频率达到采样率的一半时，人们依然可以成功地记录以及回放频率组成部分。混叠这个术语专门用来解释回放频率大于采样频率一半时的情况。 - 百度知道 by Frank Wang
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