Keysight U8903A, Руководство пользователя

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Appendixes
162 Keysight U8903A User’s Guide
Appendix C: User-defined Filter File Format
Pressing Custom in either the low pass, high pass, or weighting filters section
enables you to upload a user-defined filter file via the File Manager.
The available user-defined filter types are Infinite Impulse Response (IIR) and
Finite Impulse Response (FIR). You need to specify the coefficients or sections as
well as group delay for the respective filter type. Use the following examples to
configure the filter file format. The file is saved in the *.juf format.
Example of the FIR filter file format:
#Type: FIR
#Delay: 10
#Coefficients: [0.001, 0.002, 0.003, 0.004, 0.005]
The coefficients of the FIR filter are described as follows.
0.001 // A[0]
0.002
// A[1]
0.003 // A[2]
0.004
// A[3]
0.005 // A[4]
NOTE
The FIR filter transfer function, H ( z ), is defined as:
H(z) = A[0] + A[1]z
–1
+ A[2]z
–2
+ A[3]z
–3
+ ...
where z = complex variable