We describe the possibilities in signal processing opened by the new fully numerical data analysis system developed for the ultracryogenic resonant gravitational wave detector AURIGA. First we review the main features of the AURIGA data acquisition system. These include 5 $kHz$ data sampling, data synchronization with the Universal Time Coordinate (UTC) within $1\ \mu sec$ and full raw data storage on high density media for retrieval and off-line data reprocessing. Then we discuss some relevant points of the AURIGA data analysis system such as the data filtering and data compression algorithms, the computation of the $\chi^2$ time series for the suppression of spurious events and a novel method to reconstruct the input signals based on the Karhunen-Lo\'eve expansion.}
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