On 2014-12-18 17:10, Alan Stern wrote: > On Thu, 18 Dec 2014, Udo van den Heuvel wrote: >> In fact the airspy samples at 20 MSPS with 2 bytes per sample, but the >> host converts that to the I/Q pairs at 10 MSPS, with 2 bytes for each I >> and Q. (I was explained in #airspy) > > I don't know what "#airspy" is. An IRC channel at freenode. > If the airspy sends 20 million samples per second to the host and each > sample is 2 bytes, then the host would have to receive 40 MB/s of data > from the airspy. As I mentioned before, the usbmon trace showed that > the actual transfer rate was about 24 MB/s. That is weird or an issue or what? > 40 MB/s is a little beyond the limit of what most EHCI host controllers > are able to handle, although an xHCI host controller ought to be able > to do it. The device is usb2. I will try other ports and also recording to a plain harddisk. (not raid or encrypted) Udo -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
