In general, setting the VAC sampling rate (SR) to 48KHz, regardless of
the PowerSDR (audio) sampling rate is the established "Best Practice".
PowerSDR does a good job of SR down conversion.
There are however some cases where it may be advantageous to use a
different VAC SR, one of which is when you can't force Win7 or Vista to
accept a default SR for the defined VAC cables of 48KHz and they are
permanently "stuck" at 44.1 KHz/2 channel. See the following KB article:
http://kc.flexradio.com/KnowledgebaseArticle50504.aspx
I have found one other reason to use a different SR than 48K and that is
when you are recording off the monitor video and audio, like for YouTube
videos when you are routing the audio through a VAC cable to the vid
capture program and it is expecting a SR of 44.1 or 22.05 KHz.
The key here is to minimize the SR down (or up) conversions and let the
digital mode program or PowerSDR do them, not Windows.
-Tim
---
Tim Ellison, W4TME
Product Management, Sales & Support
FlexRadio Systems^(TM)
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Austin, TX 78728
Phone: 512-535-4713 Ext. 223
Email: t...@flexradio.com <mailto:t...@flexradio.com>
Web: www.flexradio.com <http://www.flexradio.com>
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On 10/28/2011 10:49 AM, j m swearman wrote:
Hallo all, I recently saw an instruction on changing the sample rate on line 1
and 2 of VAC to that shown in the setup menu in powersdr. I have inadvertently
deleted the details from my computer. Can anyone tell me the source of this
instruction, please? Morrice M5ADZ
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