Ok, I had a closer look, but will have to get deeper I think, since i did not fully got this.
According to my simulations, using copied samples does sometimes better.
Maybe a question of intelligent filter design.
Regarding Tom's remark: Using the copied samples also requires no additional multiplcation since the value is already stored and in use (?)
Anyway thanks.
According to my simulations, using copied samples does sometimes better.
Maybe a question of intelligent filter design.
Regarding Tom's remark: Using the copied samples also requires no additional multiplcation since the value is already stored and in use (?)
Anyway thanks.
Rolf
Gesendet: Dienstag, 24. Juli 2018 um 18:36 Uhr
Von: "Nigel Redmon" <[email protected]>
An: [email protected]
Betreff: Re: [music-dsp] resampling
Von: "Nigel Redmon" <[email protected]>
An: [email protected]
Betreff: Re: [music-dsp] resampling
(Not sure why I didn’t receive Rolf’s email directly…)
Hi Rolf,
_______________________________________________ dupswapdrop: music-dsp mailing list [email protected] https://lists.columbia.edu/mailman/listinfo/music-dspFirst, 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):
Nigel
On Jul 24, 2018, at 7:53 AM, Tom O'Hara <[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] wrote:Hello Nigelcould 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.RolfGesendet: Montag, 23. Juli 2018 um 18:25 Uhr
Von: "Nigel Redmon" <[email protected]>
An: [email protected]
Betreff: Re: [music-dsp] resamplingSome articles on my website: 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.
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