My answer is use the smallest AUDIO buffer size consistent with stable operation on your computer.
The DSP buffer size sets the performance of the filters and other algorithms but the filters are the largest impact on performance here. Set the sample rate to the lowest rate consistent with how you intend to use the radio since this increases the stability of operation. Alas, there is often tension between these requirements so the answer is "it depends" and it can be complicated. There is no simple single answer. Bob N4HY On Tue, Aug 30, 2011 at 11:43 AM, Tim Ellison, W4TME <[email protected]>wrote: > That question has and will always get an "it depends" answer. > > Understanding the cause and effect of buffer sizes (audio and DSP) and > their interaction with sampling rate is paramount before you can answer that > question. There is also a very important PC resource dependency too; > smaller audio buffers require more PC resources. > > You can begin here on your buffer knowledge quest. > http://kc.flexradio.com/**KnowledgebaseArticle50437.aspx<http://kc.flexradio.com/KnowledgebaseArticle50437.aspx> > > In my case, the answer is neither. I use 512. > > -Tim > --- > Tim Ellison, W4TME > Product Management, Sales & Support > FlexRadio Systems^(TM) > 4616 W Howard Ln Ste 1-150 > Austin, TX 78728 > Phone: 512-535-4713 Ext. 223 > Email: [email protected] <mailto:[email protected]> > Web: www.flexradio.com <http://www.flexradio.com> > > logo > /Tune In Excitement^(TM) > PowerSDR^(TM) is a trademark of FlexRadio Systems/ > > > > On 8/30/2011 9:13 AM, dan edwards wrote: > >> what setting should be used for audio buffers? still 1024 or 2048 ? >> >> 73, w5xz, dan >> --- On Tue, 8/30/11, Bob McGwier<[email protected]> wrote: >> >> From: Bob McGwier<[email protected]> >> Subject: Re: [FlexEdge] TNF + WBIR reset = hello, new radio! >> To: "Michael Smith"<[email protected]> >> Cc: [email protected] >> Date: Tuesday, August 30, 2011, 1:06 PM >> >> For my part, EVERY time there is a new code load, I run the >> calibrations. >> This is a huge piece of code and I never trust changes to be free of >> unintended consequences ESPECIALLY if I had anything to do with it. ;-). >> I >> regularly chastise that guy in the mirror while I am shaving every day >> (when >> I remember to .....). >> >> Bob >> N4HY >> >> On Sun, Aug 28, 2011 at 12:32 AM, Michael Smith<[email protected]>** >> wrote: >> >> I gotta say the TNF is an amazingly awesome feature. Being able to >>> tune out individual birdies in the passband while on 80m AM is just >>> amazing. Works so well, and the user interface is so simple and >>> effective. Absolutely class A1 implementation, guys! >>> >>> I also did a WBIR reset today. A long long time ago (in a galaxy far, >>> far away?) I loaded PSDR V 2.x, which did the WBIR calibration on my >>> rig. Not knowing any better I wasn't concerned in the slightest about >>> my antennas being connected. I did see some articles that doing WBIR >>> cal with antennas connected can lead to some not so good results. >>> I've been meaning to redo this, but hadn't got around to it. Well >>> today I had time and boy am I glad I did. Living in the Houston area >>> means, yep, there are a few pretty strong signals around. After >>> redoing the WBIR and the level calibration, it's like I have a new >>> radio. It's so QUIET! Really really amazing. I don't think >>> conditions changed that much, but man, it seems to be a pretty >>> significant difference. >>> >>> Just thought i'd pass along my kudos and good fortune! >>> >>> 73, >>> Michael >>> >>> ______________________________**_________________ >>> Flexedge mailing list >>> [email protected] >>> http://mail.flex-radio.biz/**mailman/listinfo/flexedge_**flex-radio.biz<http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz> >>> This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is >>> used >>> for posting topics related to SDR software development and >>> experimentalist >>> who are using beta versions of the software. >>> >>> >> >> ______________________________**_________________ > Flexedge mailing list > [email protected] > http://mail.flex-radio.biz/**mailman/listinfo/flexedge_**flex-radio.biz<http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz> > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used > for posting topics related to SDR software development and experimentalist > who are using beta versions of the software. > -- Flex Radio, Inc. Consultant Professor ECE Virginia Tech ARS N4HY _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software development and experimentalist who are using beta versions of the software.
