Does anyone have a link to a 16 bit 48kHz test wav that has audible (ABX) differences when downsampled to 44.1kHz?
+1 +1 -1 -1 : 12 kHz tone (with intersample overs)...Of course the difference is audible because of clipping, not because of resampling itself.
The original sample will clip in the reconstruction filter
Of the literally hundreds of thousands of hard limited tracks with those limited samples being well above -3dBFS and often at -0.1dBFS or even FS, you would think someone would have reported a problem with audible differences due to resampling on this forum as this is the type of thing that people do around here.
If you've ever determined inter-sample peaks of those contemporary hard limited (-0.1 dBFS) samples you would have noticed that they typically clip with 1.5 up to 2.5 dBFS.
Quote from: pbelkner on 27 September, 2012, 11:55:50 AMIf you've ever determined inter-sample peaks of those contemporary hard limited (-0.1 dBFS) samples you would have noticed that they typically clip with 1.5 up to 2.5 dBFS.They can, but *do* they? Who has actually done the determination of this, using contemporary samples, and where is it published?
I don't wonder about recommendations regarding best practice at all, but I certainly don't accept arguments from authority as proof.
ClippingClipping is another easy mistake, sometimes obvious only in retrospect. Even a few clipped samples or their aftereffects are easy to hear compared to an unclipped signal.The danger of clipping is especially pernicious in tests that create, resample, or otherwise manipulate digital signals on the fly. Suppose we want to compare the fidelity of 48kHz sampling to a 192kHz source sample. A typical way is to downsample from 192kHz to 48kHz, upsample it back to 192kHz, and then compare it to the original 192kHz sample in an ABX test . This arrangement allows us to eliminate any possibility of equipment variation or sample switching influencing the results; we can use the same DAC to play both samples and switch between without any hardware mode changes.Unfortunately, most samples are mastered to use the full digital range. Naive resampling can and often will clip occasionally. It is necessary to either monitor for clipping (and discard clipped audio) or avoid clipping via some other means such as attenuation.24/192 Music Downloads ... and why they make no senseChristopher “Monty” MontgomeryMarch 1, 2012http://people.xiph.org/~xiphmont/demo/neil-young.html
It is about about the evils of hard limiting and normalization without adequate headroom.
It is not about about the evils of hard limiting and normalization without adequate headroom.
If you have samples of real music where different samplerates can be ABXed, now is the time to present them.
Sorry guys, I'm not going to violate any of the forum's TOS.