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Shift-invariant system
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<h2 id="applications">Applications</h2> <p>Because digital systems need not be <a href="/facts/Causality/Swh496X7">causal</a>, some operations can be implemented in the digital domain that cannot be implemented using discrete analog components. <a href="/facts/Digital_filters/2wcxCRdh">Digital filters</a> that require finite numbers of future values can be implemented while the analog counterparts cannot. </p> <h2 id="notes">Notes</h2> <ul><li>Oppenheim, Schafer, <i>Digital Signal Processing</i>, <a href="/facts/Prentice_Hall/bynWAuat">Prentice Hall</a>, 1975, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 0-13-214635-5</li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/LTI_system_theory/kEmj0QDC">LTI system theory</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Oppenheim, Schafer, 12 <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>