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Undulating playback
macdekker
post Feb 2 2013, 12:29
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Hi,
I play all my lossy and lossless music with Foobar2000 1.2.2. But the sound seems to be undulating, as if someone is constantly playing with the volumecontrol. Really irritating.
It seems to have started when I downloaded and integrated the equalizer. Any views on this?
Thanks in advance.
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db1989
post Feb 2 2013, 14:00
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Yes. You probably have bands equalised upwards in gain, which is causing the final signal to exceed full scale (0 dB), causing some element of the subsequent signal chain to limit the signal to avoid this, causing ‘pumping’ compression.

Click on the “Auto level” button to fix this. It decreases the gains of all bands proportionally so that none are positive. Never equalise any bands over 0 dB unless you are highly confident that (A) the entire signal was quiet enough that the EQd result will not clip or (B) the increase in overall gain from the increased frequencies will be offset by decreases at other frequencies.

This applies generally, not just to foobar2000. I accept the need for it to be possible to EQ bands upwards in some cases, but applications would do well to provide more caveats about the potential results, as questions like this pop up every few months.

This post has been edited by db1989: Feb 2 2013, 14:06
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dhromed
post Feb 2 2013, 14:08
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Alternative: Do you have a Xonar sound card on XP?
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macdekker
post Feb 3 2013, 17:00
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QUOTE (macdekker @ Feb 2 2013, 12:29) *
Hi,
I play all my lossy and lossless music with Foobar2000 1.2.2. But the sound seems to be undulating, as if someone is constantly playing with the volumecontrol. Really irritating.
It seems to have started when I downloaded and integrated the equalizer. Any views on this?
Thanks in advance.


Wow, never considered this solution.

Tried it and it works. Thanks a lot.

tongue.gif tongue.gif
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db1989
post Feb 3 2013, 18:56
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QUOTE (macdekker @ Feb 3 2013, 16:00) *
Wow, never considered this solution.

Tried it and it works. Thanks a lot.

tongue.gif tongue.gif

Do you mean the auto levelling? If so, glad to help!

I don’t mean to indicate that positive gain will always cause the signal to exceed 0 dB (and thus introduce clipping or other adverse effects), as it does of course depend upon the signal in question, but it’s most definitely something to watch out for whenever EQing. One could perhaps offset the overall decrease of an auto-levelled EQ curve using careful manual adjustment or a separate gain control, but it depends on how much you need the extra volume in software and how confident you are in your ability to tweak to a final volume. Definitely the safest option is never to gain anything positively/past 0 dB.

This post has been edited by db1989: Feb 3 2013, 19:00
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macdekker
post Feb 4 2013, 09:17
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QUOTE (db1989 @ Feb 3 2013, 18:56) *
QUOTE (macdekker @ Feb 3 2013, 16:00) *
Wow, never considered this solution.

Tried it and it works. Thanks a lot.

tongue.gif tongue.gif

Do you mean the auto levelling? If so, glad to help!

I donít mean to indicate that positive gain will always cause the signal to exceed 0 dB (and thus introduce clipping or other adverse effects), as it does of course depend upon the signal in question, but itís most definitely something to watch out for whenever EQing. One could perhaps offset the overall decrease of an auto-levelled EQ curve using careful manual adjustment or a separate gain control, but it depends on how much you need the extra volume in software and how confident you are in your ability to tweak to a final volume. Definitely the safest option is never to gain anything positively/past 0 dB.


I indeed used the autolevel button and this had the desired effect.
I installed the equalizer in Foobar because I bought a Creative T3 set of speakers and the bass-unit produced way too much bass. With the equalizer I brought it down only to experience the undulating sound. It's fixed now and the combination of Foobar and the T3 set works perfectly now.

Thanks again for your help.

Regards,
Rob
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