Re: [Discuss-gnuradio] Specify taps for 'FFT_Filter' using function call to 'GLFSR Source'

Hi Chad!
So, yeah, it seems we forgot to wrap the raw C++ GLFSR with SWIG, so that it's not directly available in Python-land.

So, this[1] fixes that.

You'd use it like this:

* have an import Block, "from gnuradio import digital"
* Have a variable with id "taps_gen" (or so), value "digital.glfsr(degree, seed)". Any integer seed for which (seed%(2**degree))>0 is valid.
* in your Filter, use "[taps_gen.next_bit() for _ in range(31)]"

Hope this helps,

Best regards,

Marcus

[1] https://github.com/gnuradio/gnuradio/pull/1472

On 09/26/2017 05:45 PM, Chad Spooner wrote:

All:

I've got a working signal generator in GRC that uses the FFT Filter block. In the Taps

field of this block, I've hand-entered a length-31 sequence that is an MLSR sequence.

These sequences can be generated using the GRC block GLFRS Source as well.

What I would like to do is call GLFSR from within  the FFT Filter Taps field with arguments

that depend on a Parameter. Specifically, the Degree parameter of GLFSR would

be tied to a Parameter in the flowgraph.

I've been searching around the web for a way to do this, but I can't seem to find how

to call things like GLFSR as opposed to using the GLFSR block in GRC. My Google

searches do not seem to contain the correct keywords to get me to the help I need.

I'd appreciate any hints, especially links to explanations on the web.

Thanks!

Chad

--   Chad M. Spooner  NorthWest Research Associates  301 Webster Street  Monterey, CA 93940  cmspooner@nwra.com  831 582 4904  cyclostationary.blog  

_______________________________________________  Discuss-gnuradio mailing list  Discuss-gnuradio@gnu.org  https://lists.gnu.org/mailman/listinfo/discuss-gnuradio