Oops, meant “as Tom points out…” > On Jul 24, 2018, at 9:36 AM, Nigel Redmon <[email protected]> wrote: > > (Not sure why I didn’t receive Rolf’s email directly…) > > Hi Rolf, > > First, I should have pointed to this newer series of articles (of mine), not > old ones, earlier in this thread. You’ll get a detailed explanation of why > zeroes (and as Alex points out, the zeros can be handled efficiently so it’s > a good thing anyway): > > http://www.earlevel.com/main/tag/sampling-theory-series/?order=ASC > <http://www.earlevel.com/main/tag/sampling-theory-series/?order=ASC> > > Nigel > > >> On Jul 24, 2018, at 7:53 AM, Tom O'Hara <[email protected] >> <mailto:[email protected]>> wrote: >> >> Adding zeros is an advantage as then you don't need to calculate their >> multiplication, as 0 x coefficient = 0 >> >> The filter order will be the same with zeros or repeated samples. >> Tom >> >> On 7/24/2018 4:37 PM, [email protected] <mailto:[email protected]> >> wrote: >>> Hello Nigel >>> >>> could you please say a word more to what you mean by "2x", "3x"? >>> >>> Also I am again not sure why in this case, adding zeros is an advantage. I >>> had expected to just copy the samples to have less work to do in filtering. >>> I tested such things in MATLAB and found that feeding zeros needs more >>> filter TAPs to come to the same result. >>> >>> Rolf >>> >>> >>> Gesendet: Montag, 23. Juli 2018 um 18:25 Uhr >>> Von: "Nigel Redmon" <[email protected]> <mailto:[email protected]> >>> An: [email protected] <mailto:[email protected]> >>> Betreff: Re: [music-dsp] resampling >>> Some articles on my website: >>> http://www.earlevel.com/main/category/digital-audio/sample-rate-conversion/ >>> <http://www.earlevel.com/main/category/digital-audio/sample-rate-conversion/>, >>> especially the 2010 articles, but the Amp Sim article might be a helpful >>> overview. >>> >>> 48k -> 8k: Filter with a lowpass with cutoff below 4k; keep 1 sample, throw >>> away 5, repeat. >>> >>> 8k -> 48k: Use 1 sample, follow it with 5 new samples of 0 value, repeat; >>> filter with a lowpass filter with cutoff below 4k. >>> >>> >>> >>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> >>> Virus-free. www.avg.com >>> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> >>> <x-msg://18/#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>> >>> _______________________________________________ >>> dupswapdrop: music-dsp mailing list >>> [email protected] <mailto:[email protected]> >>> https://lists.columbia.edu/mailman/listinfo/music-dsp >>> <https://lists.columbia.edu/mailman/listinfo/music-dsp> >> _______________________________________________ >> dupswapdrop: music-dsp mailing list >> [email protected] <mailto:[email protected]> >> https://lists.columbia.edu/mailman/listinfo/music-dsp > > _______________________________________________ > dupswapdrop: music-dsp mailing list > [email protected] > https://lists.columbia.edu/mailman/listinfo/music-dsp
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