[hpsdr] Mercury v2.4 -- still distorted audio ( Atom 330 )

[Steve Niles]

My Atom 330 also has audio distortion when set to 192000 sample rate and 2048 buffer.  If I lower either the sample rate to 96000 or lower the buffer to 1024, the audio distortion goes away.

The audio distortion does not happen when using my other PC (HP dc7600).

My Mercury is at v2.4 and PowerSDR on both PC's is v1.10.4 + BaseSVN 2025.  Both PC's have fresh Windows XP Pro installs.  No other USB devises are connected to either PC besides OZY.

I'll keep checking to see if I can find what's up with the Atom 330's USB config.

73
Steve N5EN

--- kd8b at thebades.net wrote:

From: Doug Bade <kd8b at thebades.net>
To: Bill Tracey <bill at ewjt.com>, Paul Beckmann <wa0rse at gmail.com>
Cc: hpsdr at lists.hpsdr.org
Subject: Re: [hpsdr] Mercury v2.4 -- still distorted audio ( Atom 330 )
Date: Sat, 24 Jan 2009 14:58:34 -0500

***** High Performance Software Defined Radio Discussion List *****

In mine, nothing besides what is on the motherboard... Only 1 usb 
device plugged in, the cable to the HPSDR...

Doug
KD8B



At 02:47 PM 1/24/2009, Bill Tracey wrote:
>Is there anything else on the USB bus on the Atom boxes?  Wondering 
>if we're not taking a perf hit with contention for the USB bus?
>
>Regards,
>
>Bill (kd5tfd)
>
>At 01:42 PM 1/24/2009, Doug Bade wrote:
>>***** High Performance Software Defined Radio Discussion List *****
>>
>>Mine is the Atom 330 board.. lIt seems the usb subsytem is slower 
>>than expected by the software... as an above board Pci USB card did 
>>not help either... CPU load is very low but high processing rates 
>>seem to flood the data on the usb ..and introduce nasty distortion 
>>and garble.... Only the highest setting is broken, but some of the 
>>lower pairings introduce clicks and pops as well as high cpu 
>>load... Experimenting on mine I settled on 192k with buffers set to 1024...
>>
>>Doug
>>KD8B
>

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