Translations:Analog linear time-invariant systems/14/en

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An analog signal is said to be causal if the signal vanishes for time or anticausal if the signal vanishes for time . A noncausal signal is one with an anticausal component. An analog system is causal if a causal input produces a causal output. All physical, real-time systems are causal because they cannot respond to any input that has not yet occurred. From now on, we will be concerned with linear time-invariant systems. Generally, we will mean a causal system unless we specify otherwise.