[USRP-users] How do I change the number of taps and tap coefficients for the noc_block_fir_filter?

Jonathon Pendlum jonathon.pendlum at ettus.com
Wed Mar 23 22:55:29 EDT 2016


Hi Craig,

At first you would see no difference as only 21 coefficients would be
loaded but the block expects 41. If you sent your 21 coefficients again,
then your filter output would look distorted as the second set of
coefficients would complete the expected 41. Basically, don't do this. :-)



Jonathon

On Wed, Mar 23, 2016 at 7:47 PM, Swanson, Craig <
Craig.Swanson at gtri.gatech.edu> wrote:

> Jonathon,
>
> Yes, I modified the axi_fir.xci file to have 41 coefficients.  So I just
> wanted to verify the scenario if the .bit file specified 41 coefficients
> and the python file generated in GRC specified 21, what would happen?
>
>
>
> Craig
>
>
>
> *Craig F. Swanson*
>
> *Research Engineer II*
>
> *Information and Communications Laboratory*
>
> *Communications, Systems, and Spectrum Division*
>
> Georgia Tech Research Institute
>
> Room 560
>
> 250 14th Street NW
>
> Atlanta, GA 30318
>
> Cell: 770-298-9156
>
> http://www.gtri.gatech.edu
>
>
>
> *From:* Jonathon Pendlum [mailto:jonathon.pendlum at ettus.com]
> *Sent:* Wednesday, March 23, 2016 10:36 PM
> *To:* Swanson, Craig <Craig.Swanson at gtri.gatech.edu>
> *Cc:* usrp-users at lists.ettus.com
> *Subject:* Re: How do I change the number of taps and tap coefficients
> for the noc_block_fir_filter?
>
>
>
> I think you figured this out (per another thread you posted) but in case
> you didn't, you need to generate a new .xci file for the AXI FIR filter.
> You can use the Vivado GUI to do that.
>
>
>
>
>
>
>
> Jonathon
>
>
>
> On Wed, Mar 23, 2016 at 1:47 PM, Swanson, Craig <
> Craig.Swanson at gtri.gatech.edu> wrote:
>
> ​Jonathon,
>
> I remember you reviewed how to do this at GRCon15, but I don't remember.
>
> Craig
>
>
>
> *Craig F. Swanson*
>
> *Research Engineer II*
>
> *Information and Communications Laboratory*
>
> *Communications, Systems, and Spectrum Division*
>
> *Georgia Tech Research Institute*
>
>
> *Room 560 250 14th St NW*
>
> *Atlanta, GA 30318*
>
> *Cell: 770.298.9156 <770.298.9156>*
>
> http://www.gtri.gatech.edu
> <https://mail.gtri.gatech.edu/owa/redir.aspx?C=c20925f2f0af4dd29329ddf0701ecfff&URL=http%3a%2f%2fwww.gtri.gatech.edu%2f>
>
>
>
>
>
>
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