Tell me then... Where are the >4 channel 192kHz audio USB devices??
Eric Wachsmann FlexRadio Systems On Fri, Feb 20, 2009 at 10:55 AM, Lux, James P <james.p....@jpl.nasa.gov>wrote: > > > The PowerSDR software and the Windows drivers available do not know how to > deal with the asynchronous nature of USB. > > Whether it's isochronous is a canard in this situation. You're looking at, > say, 4 audio channels at 200ksamples/second at 24bits/sample, or about 20 > Mbps. A 480 Mbps channel (which is what USB2.0 is) should be able to keep > up, even with all the various inefficiencies. People (which includes me) do > 20Mbps sorts of sustained rates over 100Mbps ethernet without dropping > packets. > > It's all a matter of software design (particularly buffer management) and > system configuration (to make sure that you have enough reserve capacity in > the channel and processor so that you don't overrun). This is a difficult > challenge in the Windows PC world. But, it is clearly doable, since it's > comparable to streaming a single HDTV signal. For $99 you can buy a HDTV > receiver that is a dongle that plugs into a USB2.0 jack. > _______________________________________________ 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/
