[Tip] Debunking the myths behind sample rates

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Re: [Tip] Debunking the myths behind sample rates

Postby Blackbrook on 04 Feb 2010, 15:55

polocorp wrote:I'm considering bumping up to 48kHz this week end for a start... Thanks for the topic Stealthii :mrgreen:



+1

exactly what I will do and thanks for your topic Stealthii!!!!!
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Re: [Tip] Debunking the myths behind sample rates

Postby Marxon on 09 Feb 2010, 16:02

polocorp wrote:I'm considering bumping up to 48kHz this week end for a start... Thanks for the topic Stealthii :mrgreen:


Hi everybody!

This is a really informativ article but anyhow,
I am a little bit confused and dont really understand what to do...:cry:
Shouldt we only set up playback samplerate to 48khz or
also record @ 48khz?

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Re: [Tip] Debunking the myths behind sample rates

Postby polocorp on 09 Feb 2010, 17:52

both...

increasing input will ensure better timecode decoding and more precise scratch.

increasing output will better the sound quality, especially is the pitch is bumped up...
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Re: [Tip] Debunking the myths behind sample rates

Postby Marxon on 09 Feb 2010, 18:10

ok thank you!
one last question:
what happens if i set up my mixer to 48khz and play in mixvibes a mp3 file which was orginal recorded @44.1khz?
so only the timcode analysis gets better but sound quality will stay the same (but pitched up), did i understand this correct?

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Re: [Tip] Debunking the myths behind sample rates

Postby polocorp on 09 Feb 2010, 18:15

no it will be better for both...

your music will sound (slightly) better than it used to and it will be more noticeable in high pitches
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Re: [Tip] Debunking the myths behind sample rates

Postby Stealthii on 09 Feb 2010, 19:59

Resampling your audio from 44.1khz to 48khz is a VERY bad idea, as Cross and the sound interface will resample it anyway - you will be resampling it TWICE as I have mentioned - you are not playing it back at the exact same speed, so no, ripping your music at the original rate is the best option.


Another thing which I noticed, when ripping vinyl.. if you DO choose to rip it at a higher sample rate (let's say 96khz) you will not notice a massive difference when playing, but if you are scratching, or decide to move the vinyl really slowly.. you will indeed notice the increased fidelity. It's similar to playing a track at 50% speed - which would normally be half of 44100 which is 22050hz - not very good in comparison. At 96000 half is 48000 so it should still sound as sharp as real vinyl does when played this slowly.

There are problems surrounding this, obviously 96khz files use 2x the processing power - my NEW MacBook Pro 15" cannot handle 96khz AAC files in Cross. However if yours can, or you don't mind the space used by a FLAC (or better, a WAV/AIFF to reduce pressure on the CPU) rip your scratch vinyl at this rate - with a good mixer you should notice the increased fidelity in your headphones, like your original vinyl had.

However I'm going to point this out as unimportant - the quality of sound from general vinyl does not benefit from such fidelity, and is only noticed when you slow it down (as Cross is pumping through twice the samples through it's processes) but it's a gimmick of sound quality - just no-one's gonna notice it :)
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Re: [Tip] Debunking the myths behind sample rates

Postby bigibang on 09 Feb 2010, 20:23

Very interesting, you're totaly right, and i never thought to this.

Do you think, pass from 44.1 to 48 use a lot more cpu?
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Re: [Tip] Debunking the myths behind sample rates

Postby Stealthii on 09 Feb 2010, 20:27

Short answer: No.

The increase is insignificant. If you have problems under 48khz you will almost certainly have problems under 44.1khz too. If in doubt, bump up your sample buffer one notch - don't forget 48khz offers lower latency than 44.1khz (as the same buffer size equates for less time, due to the higher sample rate ;))

As such, 96khz will have have half the latency 48khz will have, at the same buffer size. Using that you can add a bit extra comfort to your buffer size.
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