Hi Tom, OK regarding your results.
I probably should have been a bit clearer in my original message. The problem I had was choppy audio when Audio and DSP buffer sizes were reduced from 2048. And it was this problem, rather than audio popping, that I fixed with the smaller DMA buffer size (just in case there was any confusion with respect to what I'd fixed by changing the M-Audio's DMA Buffer size). 73, - Jeff --- Tom Thompson <[EMAIL PROTECTED]> wrote: > Hi Jeff, > > I tried reducing the dma buffer size to 512, but it > did not help. What > did help was to reduce the X2 delay from 60 to 30. > I think Bob and > Frank are still working on this. Bob placed a new > version (1.6.3 svn: > 560) on the server. It had the pop problem solved, > but there were some > other issues with audio motor boating and buffer > sizes. Knowing this > community, a good solution will be forthcoming soon. > Thanks for the > suggestion. > > 73 Tom W0IVJ > > > Jeff Anderson wrote: > > >Hi Tom, > > > >Are you using the Delta 44 card? If so, try > changing its DMA Buffer size to > >512 samples. Note: you *cannot* access this third > buffer (the other two > >being the SDR1K Audio buffer and DSP buffer) from > the SDR1K Console Setup > >menues. Instead, you must launch the M-Audio > Control Panel from your > >computer's Task Bar (on my computer this is the bar > at the bottom of the > >screen, and the M-Audio Control Panel is a small > icon on its right-hand > >side). You'll find this buffer under "Hardware > Settings" in this control > >panel. > > > >I'd had exactly the same problem on my computer, > and this fixed it. > > > >Best of luck! > > > >- Jeff, K6JCA > > > > > >-----Original Message----- > >From: [EMAIL PROTECTED] > >[mailto:[EMAIL PROTECTED] Behalf > Of Tom Thompson > >Sent: Tuesday, June 27, 2006 5:33 PM > >To: Robert McGwier > >Cc: [email protected] > >Subject: Re: [Flexradio] audio pop > > > > > >Bob, > > > >I downloaded 1.6.3 svn 560 and the pop is gone with > the dma buffer set > >to 2048, the audio buffer to 1024, and the dsp > buffer to 2048 with the > >sampling rate at 96000. When I set the dsp buffer > to anything smaller > >than 2048, the audio motorboats. However, if I set > the audio buffer to > >2048, the dsp buffer can be set all the way to 256 > without > >motorboating. I just do not understand the > relatioship between these > >buffers well enough to know if this is really a > malfunction or not. > > > >On the X2 delay issue, I thought the delay was to > enable one to key an > >external amplifier before the SDR put out any RF > and then to turn the > >SDR off before the external amplifier was switched > from the antenna, > >and the delay was in milliseconds. It appears that > that is exactly what > >is happening when the SDR is keyed. When the SDR > is unkeyed, the RF and > >X2 relay keying drop off together, but the tone > during tune remains for > >the delay time. I set the X2 delay to one second > so I could better tell > >what is happening. Under normal operating > conditions this is not a > >problem. The only reason I mention it is maybe > that is not the way you > >intended it to be. > > > >Thank you for all the effort on this. > > > >73, Tom W0IVJ > > > > > > > > > > > > > > _______________________________________________ FlexRadio mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
