Oops, meant “as Tom points out…”

> On Jul 24, 2018, at 9:36 AM, Nigel Redmon <earle...@earlevel.com> 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 <tom_i...@ticino.com 
>> <mailto:tom_i...@ticino.com>> 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, rolfsassin...@web.de <mailto:rolfsassin...@web.de> 
>> 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" <earle...@earlevel.com> <mailto:earle...@earlevel.com>
>>> An: music-dsp@music.columbia.edu <mailto:music-dsp@music.columbia.edu>
>>> 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.
>>>  
>>> 
>>>  
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