GNU Radio, One Step at a Time: Re: [Discuss-gnuradio] FIR filter Interpolation vs Resampler

Hi Carlos,

this might get a little too theoretical to discuss it on the mailing list, thus I'd like to point you at the Readme [1] file referenced by the doxygen page, as I think it explains mu as fractional delay quite nicely.
The readme also references the book where the idea of the MMSE interpolator will be explained in more detail.

Best regards,
Marcus

[1] https://github.com/gnuradio/gnuradio/blob/v3.6.5/gnuradio-core/src/gen_interpolator_taps/README

On 11/10/2014 09:20 AM, Carlos Alberto Ruiz Naranjo wrote:

What is the exact meaning of the parameter mu?  http://gnuradio.org/doc/doxygen-3.6/classgr_1_1filter_1_1mmse__fir__interpolator__ff.html  I do not understand it :S    2014-11-07 12:25 GMT+01:00 Marcus Müller <marcus@hostalia.de>:

-----BEGIN PGP SIGNED MESSAGE-----  Hash: SHA1    Hi Daniel,    because both introduce delays and the delay of one of these is 2  samples longer.    Greetings,  Marcus      On 07.11.2014 10:07, Daniel Batista wrote:

Hi    I derive the output of a signal, both to an Interpolating FIR  filter and Rational Resampler (in parallel) and then I connect them  to a Time Sink (with 2 inputs). I use the same interpolation factor  for both blocks (interpolation = 4). I also use in taps the same  rcc filter. In Time Sink plot I observe a time delay in these 2  signals. Does anyone know why this happens?    Thank you Daniel        _______________________________________________ Discuss-gnuradio  mailing list Discuss-gnuradio@gnu.org  https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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GNU Radio, One Step at a Time

Monday, November 10, 2014

Re: [Discuss-gnuradio] FIR filter Interpolation vs Resampler

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