Adrien DANIEL wrote: > On Tue, Aug 12, 2008 at 9:16 AM, Clemens Ladisch <cladisch@xxxxxxxxxxxx> wrote: > > USB doesn't have a built-in sample rate; audio samples are transported > > in packets. > > Yes. I am interested by the frequency at which these packets are send. > [...] > I read a post on another list that I could report here : > -- > The reason is, the data bus of the USB is not all that fast - it's high > bandwidth, but has a slow sample rate - default is only 125 Hz. > This means you can only "deliver" a sound to begin roughly every 7.5 ms... That post is wrong, audio data packets are always sent at 1000 Hz (every 1 ms), in both Windows and Linux (input devices use a different transfer type). Regards, Clemens _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
