# Using gnuradio and the Impulse Source to Show Filter Frequency Response

**URL:** https://discourse.myriadrf.org/t/using-gnuradio-and-the-impulse-source-to-show-filter-frequency-response/6905
**Category:** Uncategorized
**Created:** [29 January 2021 19:57 UTC](https://discourse.myriadrf.org/t/using-gnuradio-and-the-impulse-source-to-show-filter-frequency-response/6905 "2021-01-29T19:57:02Z")
**Posts on this page:** 1
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### Author: ![RightHalfPlane](https://avatars.discourse-cdn.com/v4/letter/r/46a35a/32.png) [@RightHalfPlane](https://discourse.myriadrf.org/u/RightHalfPlane)
#### Post date: [29 January 2021 19:57 UTC](https://discourse.myriadrf.org/t/using-gnuradio-and-the-impulse-source-to-show-filter-frequency-response/6905/1 "2021-01-29T19:57:02Z")

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Over the last year I noticed several people futilely looking for a function to do this - so I when I got interested wrote one -

The Impulse Source permits one to view the frequency response of any filter over the entire frequency range of interest. It is an out of the tree module that installs easily on several systems. The you tube video demonstrates its use and has the install instructions.

[![](https://img.youtube.com/vi/vsm18e7duPU/maxresdefault.jpg "Using gnuradio and the Impulse Source to Show Filter Frequency Response") ](https://www.youtube.com/watch?v=vsm18e7duPU)

It is part of the gr-extras package that can be found at -

> **[GitHub - righthalfplane/gr-extras: A gnuradio Out Of Tree Modules program](https://github.com/righthalfplane/gr-extras)**
>
> A gnuradio Out Of Tree Modules program. Contribute to righthalfplane/gr-extras development by creating an account on GitHub.

The simple filters do what you expect, but throw in a Decimation, Interpolation or Frequency Xlating and I found soom rather unexpected results.