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Data Compression study with E2 data

2. Purpose of the study. Use the E2 data as bench mark forexisting compression methodsnew compression methodsIssues investigated:effective compression factorcompression/uncompression speedbias introduced in the data for lossy compressionDetailed report available (LIGO-T010033-00-E). 3. Avai

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Data Compression study with E2 data

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    1. Data Compression study with E2 data S. Klimenko, B. Mours, P. Shawhan, A. Sazonov March LSC 2001 meeting Baton Rouge, Louisiana LSC Session : Detector Characterization

    2. 2 Purpose of the study Use the E2 data as bench mark for existing compression methods new compression methods Issues investigated: effective compression factor compression/uncompression speed bias introduced in the data for lossy compression Detailed report available (LIGO-T010033-00-E)

    3. 3 Available Frame Compression (Format Spec. & I/O library) Only lossless compression methods Compression done at the vector level No need to uncompress unused channels. Standard gzip Integer are differentiated to improve compression factor. Zero suppress Differentiated data are stored with the minimal number of bits needed. Available only for integer.

    4. 4 Lossless Data Compression Performances Speed measured on a Sun Ultra 10 @ 450 Mhz The IFO was lock for this data set. Remarks: Poor speed and compression factor for float People use floating points

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