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Re: [Discuss-gnuradio] Source of annoying problem found

From: Dave Emery
Subject: Re: [Discuss-gnuradio] Source of annoying problem found
Date: Tue, 6 Jan 2004 22:25:45 -0500
User-agent: Mutt/1.4.1i

On Tue, Jan 06, 2004 at 08:34:11AM +0000, Ian Wraith wrote:

>  I should be OK Nyquist wise since I am sampling what is basically a
> 18 KHz waveform at 44.1 KHz. I had noticed my waveform amplitude was
> varying before but in my last test this suddenly became much worse. I
> now realise this was caused by me changing motherboards between these
> tests. I suspect this new motherboard has a 11 KHz low pass filter
> where as the old motherboard (another Asus but with a different sound IC)
> had a low pass filter set at a much higher frequency.

        Is there some reason why you could not consider using an
external PCI card like the Creative Audigy II which truly and genuinely
samples at 96 khz ?   Bought OEM without all the Windoze cruft they are
around $73 in the US....

        Hard to see an obvious reason for sticking just with the
motherboard sound chips...

   Dave Emery N1PRE,  address@hidden  DIE Consulting, Weston, Mass 02493

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