[cma-l] Audio crackling

[Tony Bailey]

Peter,

I mostly run Linux which has a lot of online and software support. I
Googled your problem which may have something to do with the hard drive
apparently.

http://www.techspot.com/vb/topic108566.html

Try control panel, hardware, system, device manager, disk drive, there's
a trouble shooter you can run, failing that:

http://sniptools.com/vault/getting-back-to-dma-mode-in-windows-xp#comment1891

I think DMA is direct memory access which presumably is necessary for
fast data transfer of mp3 at high bit rates.

You could prove this by running lower bit rates of course but I doubt if
that is a practical option.

I think you can mess with the windows registry these days without
wrecking things, but it's a good idea to check the helps on windows
restore points (where you can go back a day or two) in case you have
problems.  I think there are also auto checking processes that look for
registry errors you might have made.

Regards,  Tony


London Chinese Radio wrote:
> Hi,
> 
> Here is a sample of the audio. As you can see, it's pretty bad!
> It doesn't solve it by disconnecting and reconnecting the audio stream. 
> But it does sound very software-y.
> 
> The HD is an old IDE drive, but the motherboard, which has mostly SATA 
> ports on it, had an IDE port, so I installed it. So it could be 
> that...   I'm not properly trained, only find out things by overcoming 
> problems like this...!
> 
> Anyway, I am attaching a small sample from the stream...
> 
> 
> Peter
> 
> 
> 
> 
> 2011/10/31 Two Lochs Radio <tlr at gairloch.co.uk <mailto:tlr at gairloch.co.uk>>
> 
>     __
>     Does the crackle stop for a while if you stop and restart the audio
>     stream? If so, that would suggest a small bite rate mismatch is not
>     being properly handled and is resulting in repeated buffer
>     overflows, which depending on how well the software handles dumping
>     the excess data can sound like a crackle or a 'glitch'.
>      
>     But the description 'crackle' can cover a multitude of effects. is
>     it possible for you to post a little audio sample of it somewhere we
>     can access (or email me a small pice directly if you want) in case
>     the actual sound triggers any other thoughts.
>      
>     Alex
>      
> 
>         ----- Original Message -----
>         *From:* London Chinese Radio <mailto:admin at londonhuayu.co.uk>
>         *To:* CMA-L <mailto:cma-l at commedia.org.uk>
>         *Sent:* Monday, October 31, 2011 10:41 AM
>         *Subject:* [cma-l] Audio crackling
> 
>         Hi,
> 
>         I wonder if anyone has had problems with audio crackling?
>         I have recently changed to a different streaming PC, (because it
>         was XP, and I had a Marian marc8 midi sound card which has 8 ins
>         and outs, but doesn't support Win7), and it was fine for about a
>         month, until it started crackling. I put all the audio on a
>         seperate HD, and because they are quite close together, I also
>         fitted a large fan next to them, which delivers quite an icy
>         blast across the disks.
>         It starts crackling after a few hours, and it ruins the stream.
>         It is solvable by rebooting. I originally thought it could be
>         something overheating, but since it is solved by rebooting,
>         without the time for anything to cool down, I don't think that
>         is it.
> 
>         System info:
> 
>         Airmate out into Soundcard in (channels 1 & 2)
>         mAirlist (6 Channels) and computer audio (2 channels) via
>         Soundcard outs into Airmate channels
>         Asus P5K-VM motherboard with an Intel Core2 duo CPU. (it's a Red
>         Sub computer with a few extra things I've added) 
>         The CPU cooler is a bog standard one but with a funnel that
>         directs the hot air out of a vent on the side.
> 
>         Anyway, if you have an idea, I'd really appreciate any advice.
> 
> 
>         Peter Vautier
>         London Chinese Radio
>         -- 
> 
> 
>           野火烧不尽，春风吹又生
> 
> 
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