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From: | Marcus Müller |
Subject: | Re: [Discuss-gnuradio] FIR filter Interpolation vs Resampler |
Date: | Mon, 10 Nov 2014 12:26:36 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 |
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 <address@hidden>:-----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 address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio-----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJUXKwNAAoJEAFxB7BbsDrLRXAH+wY+eHL7NaeJ3zGU4Dg438nc zWwCf9zeOATF23UfQ3aSSmW3ZAder5nHcSdQAIGKjAMCjmPCKS1n3fBk17766Q+T BlJUtXGdQnXBBg2bM87nlHdVZ30mfoMBCYoDN1gWp1GV9TTkDPB99epgC/JOQwaq O0dSKun6ysIwg7MJnXYG6rf2bhc28C/cZ/mGazAPA04or4tDHXx9IIX8QTQXJppi wfR5RJYB1u4kLYc/DZVzqW+TgqzhUlgRmMDlPPGr10SANacQpRzCzFbZaRm8uaiE nfwFIyDQC7r7JlDs8+U8bTpqcfC/aAKFoZ/G1E6FVnvpcKOsembBATzQfdbt3Fo= =aRAd -----END PGP SIGNATURE----- _______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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