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Yogesh's avatar
Yogesh
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

Problem with FIR II filter

I want to configure FIR II filter to convert 15 MSPS data to 15.36 MSPS data. In order to do this Interpolation factor should be 128 and decimation factor should be 125. I have described the same bel...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi,


Sorry for the delay. I have performing different tests to narrow down the problem. I found that the errors are related to the number of coeff taps are not sufficient to achieve your interpolation. I have tested increasing the coeff no. in the "Coefficients" tab of the IP Editor to a dummy amount of 147 and the errors go away. Sorry as I am not a FIR specialist and could not really comment the right coeff no. to use for your specific case. You might need to further explore into this.


Please let me know if there is any concern. Thank you.



Best regards,

Chee Pin


pavanhegde's avatar
pavanhegde
Icon for New Contributor rankNew Contributor
5 years ago

Hello all,

I am also following same issue.

Is there any document or method for considering or calculating number of taps for FIR filter.
In the IP if we import coefficient file it will automatically shows the error is gone (as @CheePin_C_Intel mentioned )
Thank you

Regards
Pavan