[linrad] Re: 96000 Hz sampling on laptop

[w3sz <comcast.net; w3sz@xxxxxxxxxxxxxxxx>]

HI,Jeffrey,

Thanks for the note!

The information you provide is very interesting, and may even have more  
general applicability than my original post.

Your comments suggest that you misunderstood the subject of my post,  
though, as my laptop doesn't use an ESS chip.  It uses a SigmaTel chip  
that I believe is rated to sample at up to 192 KHz.  With Cool96 I can  
sample at 96000 and 192000 for both record and playback and things sound  
fine.  The message in my post was that these computers [see the original  
post for details] have SigmaTel chips that CAN sample at 96K, and in fact  
up to 192K.  I never said anything about old ESS sound chips.  By the way,  
I have proven that I can't do 384K sampling even in XP with a SigmaTel  
chip ;)

And while my laptop isn't quite state-of-the-art, as it shipped 7/5/2005,  
I wouldn't call it 'old'.  It uses a Pentium M Dothan, which is not an old  
design; at least as of last July, new versions of the chip were still  
being released.
http://en.wikipedia.org/wiki/Pentium_M

So you have opened up a new avenue of discovery, rather than explaining  
why my laptop can play 96K files.  My laptop can do so because the chip in  
it was designed to sample at up to 192000 Hz.  The fact that old sound  
chips like the ESS chips, when used with the operating systems XP and  
2000, can play 96K files is new [and different] information not directly  
related to my post.

The following wasn't clear from your post:  Does your old computer running  
Windows 2000 or Windows XP with an ESS soundchip function satisfactorily  
with the 96K files when you are using Linrad for Windows and Winrad, or  
just with other sound playback programs.  For example, can you play back  
the leon2001.wav file in Linrad for Windows and Winrad and get  
satisfactory results with the Turtle Beach sound card?  If so, as I expect  
is the case given your post, this is indeed very good news for a lot of  
people.

Thanks for an interesting post, and

73,

Roger
W3SZ

On Sun, 12 Mar 2006 15:02:31 -0500, Jeffrey Pawlan <jpawlan@xxxxxxxxxx>  
wrote:

> I believe I have the answer to Roger and others why the 96KHz wav files  
> are
> played by the old laptop with an ESS chip.
>
> Under Win2000 and also XP the supported sampling rates of the soundcard  
> or chip
> is expanded by conversion within windows. In Win98 this is not the case.  
> I just
> tried this experiment with a 2 channel 96KHz wav file on the very same  
> computer
> that has dual boot. Under 2000, the old Turtle Beach card plays the  
> 96KHz file
> even though I know absolutely for sure that the card itself can't  
> possibly use a
> 96KHz setting. But under 98 there is an error message whe I try to play  
> the
> file, and it says "this wave file is not supported on this sound card."
>
> So practically any older laptop might be able to play the 96KHz files
> provided it is running 2000 or XP. The card or chip is only going up to  
> its true
> limit which is likely 48KHz.  You will see this if you try to record,  
> sampling
> at that high rate when you input a signal to the mic or line input.
>
> 73,
>
> Jeffrey Pawlan  WA6KBL
>
>
>
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--
Roger Rehr
W3SZ
http://www.nitehawk.com/w3sz/

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