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Time reversal

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Time reversal may refer to:

  • Reverse motion – a visual effect in which reversing the order of the frames of a film or video makes time appear to run backward
  • Reverse tape effects – an audio effect in which reversing the direction of an audio recording renders sounds backward
  • T-symmetry (or time reversal symmetry) – the expected symmetry of physical laws independent of whether time runs forward or backward
  • Time reversibility – the ability of some processes to operate in either direction of time
  • Time reversal signal processing – a technique for focusing acoustic and electromagnetic waves by reversing in time a system's response signals
  • Time travel – theorised and speculative concepts about traveling into the past or the future
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