Comments on: Avoiding inter sample peaks http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/ Home recording and project studio blog Thu, 16 Oct 2008 01:58:55 +0000 http://wordpress.org/?v=2.0.4 by: Adam! http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-29865 Tue, 18 Dec 2007 05:43:44 +0000 http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-29865 Heres a (late) question: if the target format is MP3, does explicitly avoiding inter-sample overs help? The reason I ask is because it was my impression that the mp3 decoding process changes the waveform, introducing new inter-sample overs. Infact the mp3 example you posted, once decoded to wav, actually has <i>regular</i> overs, which have been induced by the decoding process. Surely keeping the track out of the red is good advice regardless, but I wonder if having zero inter-sample overs in your mixed down WAV means that an mp3 encoding of that WAV will also be free of them? Heres a (late) question: if the target format is MP3, does explicitly avoiding inter-sample overs help? The reason I ask is because it was my impression that the mp3 decoding process changes the waveform, introducing new inter-sample overs. Infact the mp3 example you posted, once decoded to wav, actually has regular overs, which have been induced by the decoding process.

Surely keeping the track out of the red is good advice regardless, but I wonder if having zero inter-sample overs in your mixed down WAV means that an mp3 encoding of that WAV will also be free of them?

]]> by: des http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-24954 Thu, 15 Nov 2007 14:23:10 +0000 http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-24954 > <em>If it goes above red then I reduce the main volume. </em> A sound practice <strong>:-)</strong> > <em>I am having a hard time believing they could be as much as 1.0 dB, though.</em> The Neilsen/Lund paper that lays out the theory for this shows a contrived example where the inter sample peaks are <em><strong>6dB</strong></em> (!!!) higher than the sampled level. They go on to say that many mastering engineers agree 3dB is a safe, conservative allowance. (And 1dB, like I said above, is the general consensus on the web, and among my engineer friends.) Here's the paper, if you want more details: <a href="http://www.tcelectronic.com/media/Level_paper_AES109.pdf" rel="nofollow">http://www.tcelectronic.com/media/Level_paper_AES109.pdf</a> > If it goes above red then I reduce the main volume.

A sound practice :-)

> I am having a hard time believing they could be as much as 1.0 dB, though.

The Neilsen/Lund paper that lays out the theory for this shows a contrived example where the inter sample peaks are 6dB (!!!) higher than the sampled level.

They go on to say that many mastering engineers agree 3dB is a safe, conservative allowance. (And 1dB, like I said above, is the general consensus on the web, and among my engineer friends.)

Here's the paper, if you want more details:
http://www.tcelectronic.com/media/Level_paper_AES109.pdf

]]> by: Michael http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-24772 Wed, 14 Nov 2007 20:56:47 +0000 http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-24772 Thanks for this, so often I hear digital anomalies. but there are so few explanations as to where they are coming from. I am having a hard time believing they could be as much as 1.0 dB, though. That is a very large interpolation for any DAC to make. Thanks for this, so often I hear digital anomalies. but there are so few explanations as to where they are coming from. I am having a hard time believing they could be as much as 1.0 dB, though. That is a very large interpolation for any DAC to make.

]]> by: kubton http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-23436 Fri, 09 Nov 2007 16:24:52 +0000 http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-23436 Good article. I fell victim to them. I lower the levels and they disappeared but never knew why when I never saw clipping on my meters. Good article. I fell victim to them. I lower the levels and they disappeared but never knew why when I never saw clipping on my meters.

]]> by: abplanet » Blog Archive » Avoiding inter sample peaks http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-23430 Fri, 09 Nov 2007 16:07:11 +0000 http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-23430 [...] sourced here [...] […] sourced here […]

]]> by: Kay Kastum http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-23324 Fri, 09 Nov 2007 02:53:27 +0000 http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/#comment-23324 Hmmm.. seriously new stuff to me. I normally just look at those little meter's. If it goes above red then I reduce the main volume. :D Hmmm.. seriously new stuff to me.
I normally just look at those little meter's. If it goes above red then I reduce the main volume. :D

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