Low Pass Filter Example: Difference between revisions
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[[File:FlowgraphWithZeroCutoffFrequency.png|700px]] | [[File:FlowgraphWithZeroCutoffFrequency.png|700px]] | ||
Double-click the ''Low Pass Filter'' block and edit the properties: | |||
* Cutoff freq: ''samp_rate/4'' | |||
* Transition Width: ''samp_rate/8'' | |||
[[File:SetLowPassFilterProperties.png|500px]] |
Revision as of 22:24, 10 January 2022
This tutorial will describe how to use a low-pass filter in GNU Radio. The previous tutorial can be found here: Creating Your First Block
Creating the Flowgraph
Begin by adding the following blocks to the GRC work space:
- Signal Source
- Low Pass Filter
- Throttle
- QT GUI Frequency Sink
- QT GUI Range
Connect the blocks in the following manner:
The QT GUI Range block will be used to control the frequency of the Signal Source block. Double-click the QT GUI Range block and edit the properties:
- Id: frequency
- Default Value: 0
- Start: -samp_rate/2
- Stop: samp_rate/2
Click OK to save.
Double-click the Signal Source block and enter frequency from the QT GUI Range variable:
Click OK to save. The flowgraph will look like the following image. Notice that the Low Pass Filter has a Cutoff Freq and Transition Width of 0:
Double-click the Low Pass Filter block and edit the properties:
- Cutoff freq: samp_rate/4
- Transition Width: samp_rate/8