User Filter File Format - Tektronix SPECMON3 Manual

GP Digital Modulation
4. Click the Browse button and navigate to the directory containing the filter you want to load. Select
the filter and click Open. If you wish to use a filter that is not in the list, select User other and
locate and open the file you wish to use.
5. Click OK to load the filter and return to the Modulation Params page.

User Filter File Format

The filter file is selected on the Modulation Params control panel tab used by the GP Digital Modulation
displays (Option 21 only). It stores the user-defined measurement or reference filter coefficient data in
CSV format. The following figure shows the file structure.
User filter file structure
A filter file is a plain text file, in comma-separated-variable format. The file extension must be CSV.
The filter file contains the following variables:
Rate.
Specifies the oversampling rate (the number of samples per symbol). The filter coefficient data will
be interpolated by the specified rate.
FilterI,FilterQ.
Specifies IQ pairs (1 to 1024) of the filter coefficient in time domain.
Rules for Creating a Filter File
A line beginning with "#" is a comment line.
Enter a positive value for the oversampling rate.
A decimal number can be expressed by fixed point or floating point. For example, 0.01 and 1.0E-2 are
both valid.
"0" (zero) and ",0" (comma zero) can be omitted. For example, "1.5,0", "1.5,", and "1.5" are
equivalent.
Lines with only a comma and blank lines are skipped.
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User Filter File Format
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