[{"data":1,"prerenderedAt":73},["ShallowReactive",2],{"glossary-en-aliasing":3},{"id":4,"title":5,"body":6,"description":59,"extension":60,"meta":61,"navigation":68,"path":69,"seo":70,"stem":71,"__hash__":72},"en_glossary/en/glossary/aliasing.md","What is Aliasing?",{"type":7,"value":8,"toc":51},"minimark",[9,13,17,22,34,41],[10,11,5],"h2",{"id":12},"what-is-aliasing",[14,15,16],"p",{},"Aliasing is an error in digital signal processing where a signal appears to be completely different (lower frequency) than it actually is because it was sampled too slowly. The \"wagon-wheel effect\" in movies, where car wheels appear to spin backwards, is a visual example of aliasing.",[18,19,21],"h3",{"id":20},"technical-explanation","Technical Explanation",[14,23,24,25,29,30,33],{},"According to the ",[26,27,28],"strong",{},"Nyquist Theorem",", to measure a signal correctly, you must sample at a rate ",[26,31,32],{},"at least twice"," the highest frequency of that signal.",[35,36,37],"ul",{},[38,39,40],"li",{},"If you sample a 50Hz vibration at 60Hz, you will see a \"ghost\" signal at 10Hz. This signal does not exist in reality; it is a mathematical error.",[14,42,43,50],{},[26,44,45],{},[46,47,49],"a",{"href":48},"/en/products/zma-data-acquisition","ZMA Data Acquisition"," modules have a sampling rate of 1000Hz (1kHz). This allows you to safely capture dynamic events and vibrations up to 500Hz without falling victim to aliasing errors.",{"title":52,"searchDepth":53,"depth":53,"links":54},"",2,[55],{"id":12,"depth":53,"text":5,"children":56},[57],{"id":20,"depth":58,"text":21},3,"The aliasing problem caused by insufficient sampling rate in data acquisition and the Nyquist theorem.","md",{"tags":62},[63,64,65,66,67],"Aliasing","Nyquist","Sampling","Signal Processing","ADC",true,"/en/glossary/aliasing",{"title":5,"description":59},"en/glossary/aliasing","PxTM1hV-xyzZj9IrYcv1wWd6asHKsbK9-uXOMmzfThM",1778229654875]