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 Forum index » How-tos » Production - engineering/mixing
Sample rates
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ian-s



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PostPosted: Tue Nov 22, 2005 2:46 am    Post subject: Sample rates Reply with quote  Mark this post and the followings unread

I’ve just splashed out on a 96/24 USB sound card and would like to know what you people do regarding sample rate when recording.
If I record at 96K instead of 88.2K, does the extra 8.8% sample rate gain more than I loose with the less than ideal, 96>44.1 conversion required for CD audio?
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elektro80
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PostPosted: Tue Nov 22, 2005 4:12 am    Post subject: Reply with quote  Mark this post and the followings unread

In general, using 44.1khz/24bit is far smarter to use than 96/24 unless you have secial reasons for doing so and also have very high end gear.

Quote:
If I record at 96K instead of 88.2K, does the extra 8.8% sample rate gain more than I loose with the less than ideal, 96>44.1 conversion required for CD audio?


No, you won´t gain 8.8 % "better" sound.

Any special reason why you want to work with samplerates above 44.1khz?

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Kassen
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PostPosted: Tue Nov 22, 2005 6:42 am    Post subject: Reply with quote  Mark this post and the followings unread

t depends. I think one of the most important questions is what will happen to this material in between recording and putting it on cd? If there are a lot of non-batched digital treatments in between then it might be werthwhile because most of the aliassing will fall out. Of cource it also heavily depends on what program you'll use for the conversion; some programs make a mess of that.

I'd personally take the 88 if the card and the software suport this.

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jksuperstar



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PostPosted: Tue Nov 22, 2005 9:16 am    Post subject: you may already know this, but for those that want to know.. Reply with quote  Mark this post and the followings unread

If you ever plan on putting this on an audio DVD, than recording at 96kHz would be better. You're right about the non-ideal conversion of 96>44.1 vs. 88.2>44.1, but I think any good down conversion is going to involve dithering and a good spline interpolation, so having those samples "dead on" won't make much of a difference (the dithering & interpolation won't use the fact that every other samples is "dead on", but each value will change slightly anyway because the dithering is spreading the quantization noise and ADC errors out across the whole spectrum).

It might be worth an experiment which depends on the music you make and the type of down-converter your software uses.
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Stanley Pain



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PostPosted: Tue Nov 29, 2005 5:08 am    Post subject: Reply with quote  Mark this post and the followings unread

i work at 48kHz because my soundcard offers lower latency at that rate in comparison to 44.1kHz, for reasons i can't pretend to understand.

however, i've convinced myself it sounds better... Confused
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Static Strobe Emitter



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PostPosted: Tue Nov 29, 2005 5:47 am    Post subject: Reply with quote  Mark this post and the followings unread

=O im just using 48khz on my 96/24 card.
i think 96khz is a bit overkill =X , but maybe thats because
i still use headphones ;D

my question would be, how do you actually notice difference
between 96khz and 48khz? .....
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elektro80
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PostPosted: Tue Nov 29, 2005 5:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Kassen has a nice point about processing. If you are going to process something a lot then doing this way up at 96 or 192 or whatever might be a smart idea. It all depends on the gear you have and what you want to do.

I am soon going to record more singers for certain sections in a piece called "Wild Blue" I will be doing this at 88.2 or 192 or something like that. The lot will be processed and properly battered into shape before reduced to 44.1/24bit.

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Static Strobe Emitter



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PostPosted: Tue Nov 29, 2005 6:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Stanley pain: you have an Creative Audigy card? (or similiar)
my Audigy 2 ZS seems to have lower latency also when running
in 48khz instead of 44.1khz, its funny =O
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Kassen
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PostPosted: Wed Nov 30, 2005 8:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Stanley Pain wrote:
i work at 48kHz because my soundcard offers lower latency at that rate in comparison to 44.1kHz, for reasons i can't pretend to understand.



That's quite simple. Imagine you have a sample rate that's one sample every 20 seconds. What would you average latency be?

Now, for your soundcard it's probably a bit more complex, I bet there's a minimum amount of samples per buffer to avoid excessive jitter and so on, so; at a higher sample rate you can burn through those samples at a higher rate, meaning the buffer clears faster meaning lower latency. This is normal, my sound card does the same.

B.T.W., now that we are chatting anyway; could you kindly credit me if you quote me on Electro Alliance? I'd feel ever so slightly better.

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