Maximum sample rate?

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Maximum sample rate?

Postby HSL » Fri May 17, 2013 9:52 am

The outputs are limited to 44.1khz or 48khz. If you have samples that are at a different sample rate, does it convert that sample rate on the fly to 44.1 or 48khz for being output, or does it somehow play it back at the sample's original sample rate?

I looked in the manual and learned you can do a sample rate convert up to 200khz. Is 200khz the maximum sample rate a sample can have? If so, why in the world is it so high, especially if the outputs are limited to 48khz anyway? This makes me think it can accept samples with a sample rate of up to 200khz, but all of them are converted to 44.1khz or 48khz when being played back. Correct me if I'm wrong though.
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Re: Maximum sample rate?

Postby JAHFUNK » Fri May 17, 2013 8:03 pm

Max sample rate is 48khz.

Imported samples above this rate are not readable.

Playback of imported samples is at the same rate as original.

Choosing a higher sample rate reduces the processors ability to transpose the pitch to higher notes because each octave doubles the sample rate playback, therefor samples with lower rates will pitch up many more octaves than those sampled at the higher rate.

If you want to increase the playable range of a high rate sample try this - Copy the sample and then reduce its rate through the onboard sample rate converter. Use this copy instead of the original or use it on only the higher notes for a better keyboard range.

This is really useful as the rate reduced copy will sound as good as the original on the higher end of the keyboard (1 octave doubles sample rate) but the original keeps clarity on the mid and lower keyboard ranges.
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Re: Maximum sample rate?

Postby HSL » Sat May 18, 2013 8:45 am

I've imported samples above 48khz and they're playing fine. If it can't read/play back samples above 48khz I'm wondering why you can convert all the way up to 200khz and the 200khz samples play fine too. I'm using EOS v4.7 so maybe you've got an earlier version? The older EIV manual says there's a limit of 50khz.
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Re: Maximum sample rate?

Postby JAHFUNK » Sat May 18, 2013 11:30 pm

Wow! your right, I checked this out tonight and using the sample rate converter I upscaled a 44.1khz sample to a resolution of 200khz.
Interesting, but why would anybody want to increase the sample rate? Surely there is nothing to be gained in the process but I can think of a few down sides.
Isn't this like converting an 700mb AVI movie into a 4GB DVD in VOB?
The quality would be no different but the file is now over four times the original size.
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Re: Maximum sample rate?

Postby HSL » Fri May 24, 2013 8:38 am

I'm guessing somewhere down the line EMU implemented the 200khz option to 'future proof'' it. I haven't tried samples above exactly 50khz yet but I suspect 200khz would work fine in it. From what it looks there's no point in having samples above 48khz since the master output is locked to that, so you might as well convert. Maybe there's another benefit?

As mentioned earlier though, the master output sample rate is 48khz. I'm guessing the way this works is that any sample at any sample rate is upconverted/downconverted or pitch stretched to match the master 48khz output sample rate.

Kontakt does the same thing I think. That's some magic right there :grin:
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