|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
203.36.94.95
In Reply to: Nope posted by Christine Tham on February 16, 2007 at 14:15:26:
On page 15, it clearly states:In Windows Server 2003 and earlier versions of Windows, including Windows Me and Windows 98, usbaudio.sys supports the adaptive and synchronous endpoints, but does not implement the asynchronous endpoint correctly. Full support for asynchronous endpoints in usbaudio.sys is planned for Windows Vista.
Follow Ups:
I think I have explained this a long time ago. I believe this is legal speak for there might be a bug that makes this not 100% standards compliance.Depending on your computer and USB interface it works actually quite well.
Cheers
*** Depending on your computer and USB interface it works actually quite well. ***I would like so see some evidence of this, other than an assertion.
My understanding is the XP usbaudio.sys is a USB 1 audio class driver, and USB 1 does not support sampling rates higher than 48k.
Therefore, if a device works at 96k, it's probably not using that particular driver.
Things may be different if you also have the UAA driver loaded in your system. I believe UAA comes with an updated USB audio class driver which may well support additional features. But remember, this is NOT the original XP usbaudio.sys driver.
So basically what I would like to see is evidence that, on a computer without UAA loaded, you have attached a USB device, which can be shown to be using the usbaudio.sys driver (you should be able to show this using the Hardware Manager device properties), and you can show that it's operating in asynchronous mode, at 96kHz (I'm not sure how you can demonstrate this, but I'm all ears).
I don't mean to be intentionally skeptical, but I am finding it difficult to believe what you are saying.
I can check for the async mode since I don't have access to an 2NX right now but I am happy to plug-in my Optoplay for you right now.Works just as it has for many years. Shows up as USB audio device in the device manager and uses USBaudio.sys as the driver. When I play 24/96 material the data rate indicator on my DAC switches from 44 to 96.
The simple way to show which mode it is operating under is with a USB monitor. That is at least the way I used last time. In async mode you will find a second isochronous endpoint that is going from the sound card to the computer. This channel is being used to tell the computer how much data to send over the primary channel.
No need to get worked worked up about this I am just trying to help.Cheers
.
.
This post is made possible by the generous support of people like you and our sponsors: