# Convolution **URL:** \ **Category:** GNU Radio\ **Created:** [November 17, 2013, 2:51pm UTC](https://www.ruby-forum.com/t/convolution/237516 "2013-11-17T14:51:24Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Post date:** [November 17, 2013, 2:51pm UTC](https://www.ruby-forum.com/t/convolution/237516/1 "2013-11-17T14:51:24Z")
Hi. I’m new to GNU Radio but have experience with basic DSP (using MATLAB for instance). Which blocks can I use to do these simple tasks: 1. Convolution with an arbitrary (constant) wave in the time domain? Example: I provide the wave as a fixed series of constants, I’d like to convolute with it. 2. The same thing in the frequency domain? ---
**Author:** ![robertjames](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e9c0ed/32.png) [@robertjames](https://www.ruby-forum.com/u/robertjames)\ **Post date:** [November 17, 2013, 5:36pm UTC](https://www.ruby-forum.com/t/convolution/237516/2 "2013-11-17T17:36:10Z")
On Sun, Nov 17, 2013 at 8:32 AM, Robert J. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Hi. I’m new to GNU Radio but have experience with basic DSP (using > MATLAB for instance). Which blocks can I use to do these simple > tasks: > > 1. Convolution with an arbitrary (constant) wave in the time domain? > Example: I provide the wave as a fixed series of constants, I’d like > to convolute with it. > > 2. The same thing in the frequency domain? The fir\_filter\_XXX does time-domain convolution. You’d pass it a decimation of 1 and the taps would be the signal you want to convolve against. The fft\_filter\_XXX does fast convolution in the frequency domain. > **[GNU Radio Manual and C++ API Reference: Filter Signal Processing Blocks](https://www.gnuradio.org/doc/doxygen/page_filter.html)** Tom