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Date: Tue, 06 Dec 2011 22:04:33 +0100
From: wolf_dl4yhf <dl4yhf@freenet.de>
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Subject: Re: LF: Sound blaster issues or maybe a Dell....
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Hi Laurence,

I had a similar effect once (but with an internal audio device in a 
notebook):
The ADC's sampling rate jumped by a few percent in the moment some other 
program decided to play some acoustic speaker through the card. My 
guess: Windows 'helpfully' jumped in when the other program asked for a 
different sampling rate than the first, and activated a resampling 
process (most likely implemented in software). In that case, it helped 
to use a second ("dummy") audio device as the DEFAULT soundcard (= audio 
device number '-1'), use that one for the windoze system sounds etc, and 
another (real) audio device for Argo & Co.
On the windows driver development kit, there is a dummy driver called 
'MSVAD' (microsoft virtual audio device). It's intended to be used by 
software developers, but maybe (I didn't try this) it can be used as a 
dummy 'default audio' device. Alternatively, use an unused bluetooth 
audio device, or an el-cheapo USB audio device for the same purpose.
Then, there will hopefully only be *one* application using your external 
24 bit sound blaster.

Second alternative: If there's an ASIO driver for your 24-bit device, 
use it. ASIO only allows exclusive use, which means once it is allocated 
by one application, no other application can hijack it. You may even 
uninstall the 'standard multimedia' drivers for your card; the ASIO 
drivers will keep working. At least they did with a Creative Extigy 
which I had been using several years ago.

All the best,
     Wolf .

Am 06.12.2011 21:16, schrieb Steve Dove:
> Hi Laurence,
>
> Just a stab: it's unlikely an oscillator is coming up on different 
> frequencies but it may be that in one 'mode' it's using the USB 
> device's clock and in the other cuddly Widnows is nicely using it's 
> sample-rate-converter on you.  How to make it stop doing that I don't 
> know - boot order or such?
>
>         Cheers,
>
>                 Steve
>
>
> On 12/6/2011 7:51 PM, Laurence KL7UK wrote:
>> Im using an external 24 bit sound blaster (USB) @ 96k on one of the dell
>> pc's in Alaska and not sure if its the PC or the card but it
>> occasionally and annoyingly on PC reboot "moves" 20Hz or so (dang it) -
>> so here I am looking at DCF39 and in fact its off the scale somewhere
>> for a couple of days - that and Stefan may have been visible but I was
>> looking/cal'd in the wrong place.
>>
>> It apparently flips to one rate or another - checking up what it flipped
>> to last time comes up with the same cal figure using Argo. Highly
>> annoying but not being able to physically throttle the devices
>> (electronically or physically!) Im a bit restrained. As an example in
>> one state using Argo cal of 1000Hz the offset is 1003.2 and
>> alternatively 1023.7 Hz - Not sure if anyone else has seen a simliar
>> issue but its annoying - it appears only to "flip" when the PC is
>> booted. At the moment its on spec and giving a nice daylight view of
>> DCF39 or the 137.777 window - Ill move it down to 136.172 and HGA22
>> windows later
>>
>> Laurence KL7UK Alaska remotely operated from (freezing cold) Oklahoma
>>
>>
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - www.avg.com
>> Version: 8.5.454 / Virus Database: 271.1.1/4059 - Release Date: 
>> 12/05/11 19:34:00
>>
>
>
>