The maximum audio buffer size in PowerSDR is 2048, so I wouldn't recommend going higher than that in the driver. Note that the DSP buffers can go as large as 4096. Note that the DSP buffer size (not the audio buffer size) affects the filter shape. You are correct that multiples of the driver could be used in the audio setting and it will work. But you'd have to ask yourself...why? ;)
Eric Wachsmann FlexRadio Systems "*Tune in Excitement!" ™* On Fri, Feb 20, 2009 at 12:19 PM, Brian Lloyd <brian-wb6...@lloyd.com>wrote: > On Fri, Feb 20, 2009 at 9:46 AM, Eric Wachsmann <e...@flex-radio.com> > wrote: > > So Eric, it seems to me that the right answer is: always set the > buffer size in PowerSDR to the same value as the buffer size set into > the FireWire driver. Is there any situation where that would not be > the case? (Hmm, I may have answered my own question below but I would > like confirmation if possible.) > > Also, do you contemplate allowing driver buffer sizes larger than 2K? > When operating at 192Ksps I would like my buffer to be twice as large > so that a buffer represents the same total sample period so I can get > the same filter performance. Does this mean that I should set the > driver buffer size to maximum, i.e. 2048, and then PSDR audio buffer > size to 4096? My normal reaction would be to always make buffer sizes > a power-of-2 so that things end up on nice address boundaries. I would > also think that PSDR buffer sizes should be exact multiples of driver > buffer sizes to ensure no wasted memory and efficient transfers. > > Inquiring minds want to know. ;-) > > 73 de Brian, WB6RQN/J79BPL > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
