# Translations:Water reverberations - book/5/en

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where the successive nonzero values are separated by the discrete time parameter *N*. That is, zeros separate any two consecutive nonzero values. For this reason, *N* is called the cycle time of the reverberation. The one-pass dereverberation filter is the inverse of the one-pass reverberation train; that is, the one-pass dereverberation filter is the minimum-delay operator