[hpsdr] audio distortion issue

[Mark Amos]

All,

I hear the same distortion issue with the new release.  Very quiet signals
seem to be a little better, but it's hard to tell. 

Filter width doesn't seem to matter - even at 25 Hz, the distortion is quite
pronounced - sounds like an early transistor guitar fuzz box - not the warm
fuzzy fuzz of a tube amp. So, that would suggest that the distortion is
happening "after" the filter.

This is new - a CW note at 25 Hz before was very round and sinusoidal.

Mark

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org]On Behalf Of Riho B., ES7AAZ
Sent: Thursday, June 11, 2009 3:50 AM
To: hpsdr at openhpsdr.org
Subject: Re: [hpsdr] New code posted


There is a noticeable distortion is audio now, no matter what the sample
rate is.
No glitches, but sounds really strange. I have a previous versison as well,
no distortion,
sounds very nice.


Regards,
Riho, ES7AAZ


Message: 11
Date: Thu, 11 Jun 2009 23:18:19 -0700
From: "Dan Quigley" <dquigley at msn.com>
Subject: [hpsdr] New Code and Distortion
To: <hpsdr at lists.openhpsdr.org>
Message-ID: <BLU142-DS7C62347DEF9861A661618DB430 at phx.gbl>
Content-Type: text/plain; charset="us-ascii"

I can confirm that the new FPGA code works from a cold start. Woot!  I can
also confirm that there is a new "high frequency" audio distortion on some
received signals. It seems to be relative to signal strength (e.g. the
higher the signal strength level the more likely there is distortion.  It
appears to be an issue with Rx ALC. 

Best 73's,
Dan (N7HQ)