[wdmaudiodev] Re: There is noise in my audio driver with USB 3.0 controller
- From: Moore Zhang <chinahearing@xxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sun, 30 Sep 2012 22:10:24 +0800
Hi Tim:
Thanks for your info and suggestion, I will try to install a win8 OS and
test the USB 3 port later.
发件人: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] 代表 Tim Roberts
发送时间: 2012年9月29日 0:34
收件人: wdmaudiodev@xxxxxxxxxxxxx
主题: [wdmaudiodev] Re: There is noise in my audio driver with USB 3.0
controller
Moore Zhang wrote:
I happened to find that when I plug in my USB 1.1 audio device in the USB 3.
0 controller port, there will be noisy when playing music with WMP. But if
plug in USB 1.1 or 2.0 controller port, always fine. I’m prepared to
analyze and debug the driver code now, but before that does any guy in this
list has similar experience of this issue? Should AVStream audio driver make
special process for USB 3.0?
Prior to Windows 8, the world of USB 3.0 is a jungle, because Microsoft does
not support it. When you use a USB 3 host controller in Windows 7, you are
using a driver stack provided by the host controller manufacturer. No one
knows what rules they followed, or what quality control they used.
There SHOULD NOT be any difference for a USB 2 device plugged in to a USB 3
port, but I know some of my web cameras do not operate in some USB 3 ports,
and I have no explanation for it.
I suggest you try your device in a Windows 8 system with USB 3 and see if it
behaves correctly.
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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