cwb_xtalk

This page provides a description of the cwb_xtalk command.


Info

The xTalk catalog files contain the overlapping coefficients between WDM pixels and are used by
wavelet-packet to reconstruct the signal using pixels at different resolution levels.

Usage

This command generates the xtalk catalog used in the Multi Resolution Analysis.

Syntax

  • cwb_xtalk (without arguments)

    Prints help

  • cwb_xtalk low_res_level high_res_level iNu precision

    It generates the xtalk catalog


Further information
The following options can be passed to cwb_xtalk:
action =    low_res_level     :  it corresponds to the lower resolution level.
                                 The level is selected as 2^low_res_level

            high_res_level    :  it corresponds to the higher resolution level.
                                 The level is selected as 2^high_res_level

            iNu               :  (optional, by default set to 4) it corresponds to the sharpness
                                 of the 'edge' of the basis function in Fourier domain

            precision         :  (optional, by default set to 10) it defines the filter length
                                 by truncation error quantified by P = -log10(1 - norm_of_filter)

Examples

  • The following command line generates the Overlap Catalog file OverlapCatalog-lLev3-hLev8-iNu4-P10.bin with low- and high-resolution layers equal to 8 and 256, respectively:

    cwb_xtalk 3 8

Note

The overlap catalog files used for the Second Observational run O2 searches is:

  • BurstLF, BurstHF, BBH, IMBHB:

    OverlapCatalog16-1024.bin (is equal to the file OverlapCatalog-ilLev4-hLev10-iNu4-P10.xbin)

    The file is generate with the following command: cwb_xtalk 4 10 4 10

  • BurstLD:

    OverlapCatalog-ilLev6-hLev12-iNu6-P10.xbin

    The file is generate with the following command: cwb_xtalk 6 12 6 10

For the Third Observational run O3 searches we will plan to use:

  • BurstLF, BurstHF, BBH, IMBHB:

    OverlapCatalog-ilLev4-hLev10-iNu6-P10.xbin (almost equivalent to OverlapCatalog-ilLev4-hLev10-iNu4-P10.xbin)

    The file is generate with the following command: cwb_xtalk 4 10 6 10

  • BurstLD:

    OverlapCatalog-ilLev6-hLev12-iNu6-P10.xbin

    The file is generate with the following command: cwb_xtalk 6 12 6 10

Attention

The generation of the catalog files may takes a while. We suggest to download the files from the public directory WDMxTalk-Catalogs

The line command to download OverlapCatalog16-1024.bin is:

wget https://owncloud.ego-gw.it/index.php/s/qHBlJIOhpC6K9U3/download -O OverlapCatalog16-1024.bin

The line command to download OverlapCatalog-ilLev6-hLev12-iNu6-P10.xbin is:

wget https://owncloud.ego-gw.it/index.php/s/cPsA5THoEUwLMXn/download -O OverlapCatalog-ilLev6-hLev12-iNu6-P10.xbin