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Crazy problem: USB port provides bad sound, but only at low CPU usage, Was: CrazyProblem:BadSound@lowCPU-usage (Please use your space bar.)
post Jan 20 2012, 12:14
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USB port provides poor sound quality

Itís a Windows XP or Hardware not a DJ-Soft Problem.
Only I do not know, where I could ask such a question otherwise.

Problem occurs when sound output via USB (via Jack OK).
- Via ext USB Sound Card
- Via USB Headphone / Mic earphones (which have a well-integrated sound card)

No Problem when:
+ powered USB hub between PC and sound card "sound OK" ( "bad sound" without power )
+ The REALLY WEIRD: if I increase CPU usage, e.g. if I move a window in Windows continuously the output is OK

Attachment: 2 WAV sound files:
I'm alternating every 10 seconds during playback,
- move a window in a circle permanently CPU Usage 60..64% >> Sound ok
- Then without window moving CPU Usage 2...7% >> sound bad
Each WAV starting with window moving(so: 10s good, 10s bad, and so on (etc))

Could it be due to the USB power? (Not yet measured)
I've read that some USB devices could damage PC.
"This could, in extreme cases damage the USB port on the host or upset the energy management of the computer, which can lead to unstable behavior."
Possible? While yes: enough to measure only via Soft-PC-Diagn.Tool e.g. SpeedFan? Or do I have to measure with a MultiMeter?

Could it be speed of USB?
My PC has USB2.0, however I have not found out about whether "Hi-Speed" or "Full Speed"

What ever could it be???

Am glad to rest every tip, even to the other proposals in which forum should be posted!
Thank you
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post Jan 21 2012, 08:00
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From: Pomerania
Member No.: 7541

reselty, the description in your first post would seem to suggest a power issue, yes, like few already suggested. Possibly the USB devices getting a bit "dirty" power when the CPU constantly falls in & out of sleep modes (which happens virtually only when its idling). And it's unlikely you'd be able to measure fluctuations of such kind with software tools or with a standard issue multimeter (OTOH they should nicely show on an oscilloscope...)

QUOTE (Roseval @ Jan 20 2012, 13:46) *
As this looks to be CPU load related, sometimes power saving schemes can hav a very negative impact.
Try disabling the power saving

QUOTE (reselty @ Jan 20 2012, 14:35) *
Hi Roseval
ThanX for the fast answer!
Tried it -didn't changed anything.
If I understood you the right way: Power management settings:
Configurated like :
(In all cases "never")

That link would NOT be about the issue which I suspect to be responsible; the article, this kind of power management, is a "global" or "macro-scale" operating system behaviour - a computer hibernating when not in usage.

But your symptoms look more like due to something which nowadays happens constantly on a "micro" level (together with...; or even more aggressive, the CPU essentially going into short micro-sleep periods, imperceptible to us).
I guess it's conceivable that, with your particular motherboard or laptop, the impact of those constant & extremely frequent changes isn't filtered adequately enough (for your USB audio devices at least) from the power supplied to the USB ports...

...while the audio from line-out (from integrated sound, I guess) is OK since that part of your motherboard is adequately shielded from those effects; because somebody did think about that.

CPU-Z can show if your CPU dynamically adjusts its speed & voltages.

It's all probably kinda related to how, a decade+ ago, moving the mouse pointer seemed to generate some line-out buzz on many PCs... (then: possibly activity from mouse interrupts, and/or simply just different kind of electrical impulses from the mouse, manifesting themselves on power levels). Heck, on one old motherboard of mine, when you turn on such aggressive CPU power saving (then typically not enabled, not used on desktop machines, hence the motherboards universally - not just rarely - neglected to implement it properly, its effects), some component on the motherboard itself starts to... "sing", in response to those fluctuations.

If that's the culprit, you can always turn it off of course (maybe in some control panel of your motherboard drivers / tool from the manufacturer installed together with them, maybe in the BIOS like A_Man_Eating_Duck suggests - I think those settings can be found there on every of my machines). But remember, probably at the cost of higher overall power consumption.

Can't you just continue using the powered hub?

Could it be speed of USB?
My PC has USB2.0, however I have not found out about whether "Hi-Speed" or "Full Speed"

BTW, USB 2 always has Hi-Speed capability, that's what it is. Full Speed is one of the USB 1 modes.

This post has been edited by zima: Jan 21 2012, 08:09

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Posts in this topic
- reselty   Crazy problem: USB port provides bad sound, but only at low CPU usage   Jan 20 2012, 12:14
- - Roseval   As this looks to be CPU load related, sometimes po...   Jan 20 2012, 13:46
|- - reselty   Hi Roseval ThanX for the fast answer! Tried it...   Jan 20 2012, 14:35
- - slks   If you could tell us how the audio sounded "b...   Jan 20 2012, 14:46
|- - reselty   Answer 4 slks Thanks a lot about your thoughts. ...   Jan 27 2012, 22:31
- - hlloyge   Reinstall chipset drivers, check DMA settings if y...   Jan 20 2012, 15:13
|- - reselty   hlloyge Thanks I tried - No Changings (Chipset-Dri...   Jan 20 2012, 20:00
|- - reselty   QUOTE (hlloyge @ Jan 20 2012, 16:13) Rein...   Jan 27 2012, 22:52
- - Ouroboros   It seems illogical that it should work better at h...   Jan 20 2012, 15:17
|- - reselty   QUOTE (Ouroboros @ Jan 20 2012, 16:17) It...   Jan 27 2012, 23:24
- - JimH   QUOTE (reselty @ Jan 20 2012, 05:14) No P...   Jan 20 2012, 16:44
- - Maggi   you could also have a look into your system's ...   Jan 20 2012, 17:09
|- - reselty   QUOTE (Maggi @ Jan 20 2012, 18:09) you co...   Jan 28 2012, 01:46
|- - Maggi   QUOTE (reselty @ Jan 28 2012, 01:46) QUOT...   Jan 31 2012, 15:26
|- - reselty   Thanks for Inputs Maggi and Arnold I tried many o...   Feb 1 2012, 15:01
- - reselty   Thanks 4 the moment to all of you !!! ...   Jan 20 2012, 20:02
|- - Nessuno   Try to boot in a different OS install, a live Linu...   Jan 21 2012, 01:34
- - A_Man_Eating_Duck   What is the model number of your motherboard? Som...   Jan 20 2012, 21:33
- - zima   reselty, the description in your first post would ...   Jan 21 2012, 08:00
- - reselty   Thanks to all of you So much answers and I could...   Jan 27 2012, 22:17
- - reselty   Thanks JimH That's why the powered hub works b...   Jan 27 2012, 23:31
- - saratoga   Overloaded USB voltage regulator seems most likely...   Jan 28 2012, 00:11
- - A_Man_Eating_Duck   what motherboard\PC do you have?   Jan 28 2012, 02:48
- - reselty   Hi - Found the problem Thanks a lot to all of you ...   Jan 28 2012, 13:34
- - reselty   Infos you asked me in between my absence and for o...   Jan 28 2012, 13:59
- - zima   C-states: http://en.wikipedia.org/wiki/Advanced_Co...   Jan 28 2012, 14:29
- - reselty   Thnx again I'll only use it, when necessary.....   Jan 28 2012, 16:46
- - A_Man_Eating_Duck   When i had random bacon sizzling noises on my m-au...   Jan 28 2012, 20:00
|- - reselty   QUOTE (A_Man_Eating_Duck @ Jan 28 2012, 21...   Jan 30 2012, 17:44
- - Arnold B. Krueger   I think you are onto something with the USB power ...   Jan 31 2012, 14:13

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