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Are high sample rates better for DSP?
Ethan Winer
post Jun 10 2012, 20:13
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I've read many times that audio plug-ins such as equalizers work better at higher sample rates, even if audio generally doesn't benefit. It seems unlikely that there's a practical advantage to up-sampling all your files, or recording at 96 KHz in the first place, but is there a potential theoretical improvement? Or is this just another Internet myth?

--Ethan


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xnor
post Jun 11 2012, 01:37
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Many EQs use simple bilinear-transformed filters (the entire frequency response of the analogue prototype is "crammed" into the range 0 - Fs/2 Hz), which behave like lvqcl posted above. There's also EQs that oversample internally to reduce this effect. Some EQs use orfanidis filters which are not very accurate but overall match the bell curve better even near nyquist. And then there's EQs that use higher order filters that are very accurate up to ~20 kHz (44.1 kHz sample rate).

So yes, in case you need to use peak filters near nyquist and want the bell curve to look like the analogue prototype and have a simple EQ as explained above you should use a higher sample rate.

This post has been edited by xnor: Jun 11 2012, 01:45
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Posts in this topic
- Ethan Winer   Are high sample rates better for DSP?   Jun 10 2012, 20:13
- - knutinh   The higher the sample-rate, the better any approxi...   Jun 10 2012, 20:46
- - lvqcl   Here is an example of such filter (with explanatio...   Jun 10 2012, 20:56
- - benski   Yes, many filters work better with higher sampling...   Jun 10 2012, 21:17
|- - Ethan Winer   QUOTE (knutinh @ Jun 10 2012, 15:46) The ...   Jun 11 2012, 17:18
|- - saratoga   If your software is good, it should be upsampling ...   Jun 11 2012, 17:53
|- - drewfx   QUOTE (Ethan Winer @ Jun 11 2012, 12:18) ...   Jun 11 2012, 19:11
|- - Ethan Winer   QUOTE (saratoga @ Jun 11 2012, 12:53) If ...   Jun 12 2012, 17:46
|- - extrabigmehdi   QUOTE (Ethan Winer @ Jun 12 2012, 16:46) ...   Jun 12 2012, 18:15
- - xnor   Many EQs use simple bilinear-transformed filters (...   Jun 11 2012, 01:37
- - Woodinville   In addition to the warping one sees in a bilinear ...   Jun 11 2012, 01:46
- - extrabigmehdi   That's interesting, so basically if you want ...   Jun 11 2012, 02:30
- - bandpass   QUOTE (knutinh @ Jun 10 2012, 20:46) The ...   Jun 11 2012, 08:00
|- - knutinh   QUOTE (bandpass @ Jun 11 2012, 09:00) Tru...   Jun 11 2012, 08:30
- - bandpass   From a practical perspective, a particular effect/...   Jun 11 2012, 09:59
|- - knutinh   QUOTE (bandpass @ Jun 11 2012, 10:59) ......   Jun 11 2012, 11:55
- - greynol   I know the unofficial mantra around here is all th...   Jun 12 2012, 17:59
|- - Ethan Winer   QUOTE (greynol @ Jun 12 2012, 12:59) You...   Jun 12 2012, 19:35
|- - drewfx   QUOTE (Ethan Winer @ Jun 12 2012, 14:35) ...   Jun 12 2012, 20:29
|- - saratoga   QUOTE (Ethan Winer @ Jun 12 2012, 14:35) ...   Jun 12 2012, 21:12
|- - Ethan Winer   Thanks Drew for some hard evidence. Can you explai...   Jun 12 2012, 22:46
||- - benski   It's mostly that the shape (aka Q) is going to...   Jun 12 2012, 23:39
||- - drewfx   QUOTE (Ethan Winer @ Jun 12 2012, 17:46) ...   Jun 13 2012, 01:52
||- - andy o   I'm guessing these are the reasons why A/V rec...   Jun 13 2012, 03:27
|||- - Arnold B. Krueger   QUOTE (andy o @ Jun 12 2012, 22:27) I...   Jun 25 2012, 13:10
|||- - Woodinville   QUOTE (Arnold B. Krueger @ Jun 25 2012, 05...   Jun 27 2012, 21:59
||- - Ethan Winer   QUOTE (drewfx @ Jun 12 2012, 20:52) The 1...   Jun 13 2012, 19:55
|- - Woodinville   QUOTE (saratoga @ Jun 12 2012, 13:12) QUO...   Jun 13 2012, 01:22
- - greynol   Have you read the responses to your topic? I want...   Jun 12 2012, 19:42
- - greynol   As for the "it's best to record at 96kHz ...   Jun 13 2012, 00:53


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