Unregistered editors using this IP address received messages on this talk page years ago. Since users of the IP address have likely changed, these messages have been removed. They can be viewed in the page history.
Found another vandalism by this IP back in 2008-01-20T09:03:41 in the Quantization error, which went unnoticed so far and was merged into the Quantization (signal processing) article: https://en.wikipedia.org/w/index.php?title=Quantization_error&action=historysubmit&type=revision&diff=185605909&oldid=179800828
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