[wdmaudiodev] Re: Why would you want USB Audio 2.0 in Windows?

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 18 Nov 2009 09:15:56 -0800

Clemens Ladisch wrote:
> And for a purely technical reason: High-speed USB audio devices do not
> eat as much bandwith on the bus, so they work better together with other
> devices.
>   

Well, this statement is not quite accurate.  A full-speed isochronous
device uses a larger percentage of a full-speed controller's available
bandwidth than a high-speed device uses of a high-speed controller, but
having a full-speed device on a high-speed controller doesn't have any
more impact than a high-speed device of the same rate.

Further, it's quite possible to have a USB Audio 1.0 device run at high
speed, as long as your isochronous interval is not smaller than 1 per
frame.

-- 
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.

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