Re: LF: Sound blaster issues or maybe a Dell....

[Daniele Tincani <danieletincani@yahoo.com>]

Hello gents,

 

personally, I use an external E-MU 0202 USB card with ASIO drivers for Winrad, SpecLab, etc. while the on-board Realtek device is used with Windows drivers for normal audio in/out (e.g. system sounds, MediaPlayer, VoIP, etc.). Also, in Windows audio control panel, I keep every thing disabled except the Realtek mic/line input and speakers/phones output.

 

Best regards

Daniele

Da: wolf_dl4yhf <dl4yhf@freenet.de>
A: rsgb_lf_group@blacksheep.org
Inviato: Martedì 6 Dicembre 2011 22:04
Oggetto: Re: LF: Sound blaster issues or maybe a Dell....

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
>>
>
>
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