Rohde & Schwarz RTE Series - FIR Filter in the Formula Editor

Waveform analysis
R&S
®
RTE
311User Manual 1326.1032.02 ─ 20
sample frequency in Matlab and the sample rate at the oscilloscope to the same value.
If the values differ, the filter is shifted in frequency.
In R&S RTE, in the "Basic" math editor, select the filter "Type" = "User defined", and
load the CSV file.
7.3.5.2 FIR filter in the formula editor
You can type the FIR filter formula directly in the ""Advanced"" tab, or open the formula
editor and use the buttons to create the formula.
Highpass and lowpass FIR filter
The general syntax for highpass and lowpass filters is:
FIR(tpye,source,limit,shape)
●
Type is lowpass or highpass
●
Source is the input channel of the signal.
●
Limit is the cut-off frequency
●
Shape is gaussian or rectangle for the lowpass filter, and gaussian for the high-
pass.
► For example, to set a rectangle lowpass filter on channel 1 with 10 MHz cut-off fre-
quency, enter:
FIR(lowpass,Ch1,1e+07,rectangle)
► For example, to set a Gaussian highpass filter on channel 2 with 1.5 GHz cut-off
frequency, enter:
FIR(highpass,Ch2,15e+08,gaussian)
Bandpass and bandstop FIR filter
The syntax for the bandpass filter is:
FIR(userdef,source,path)
●
Source is the input channel of the signal.
●
Path is a string containing the path and filename of the filter file. The file contains
the comma-separated filter coefficients.
► For example, to set a bandpass on channel 1 with filter coefficients saved in the
bandpass.csv file, enter:
FIR(userdef,Ch1,"C:\Users\Public\Documents\Rohde-Schwarz\RTx\bandpass.csv")
Mathematics