[wdmaudiodev] Re: Discovery of Analog Audio Device

Thanks Hakon, I would love to read that whitepaper.

Ernest L. Burghardt
Software Engineer
Logitech
360-256-3239 (office)


                                                                           
                                                                           
                                                                           
             Hakon Strande                                              To 
             <hakons@xxxxxxxxx         <wdmaudiodev@xxxxxxxxxxxxx>         
             icrosoft.com>                                              cc 
                                                                           
             Sent by:                                              Subject 
             wdmaudiodev-bounc         [wdmaudiodev] Re: Discovery of      
             e@xxxxxxxxxxxxx           Analog Audio Device                 
                                                                           
                                                                           
             11/06/2007 09:57                                              
             AM                                                            
                                                                           
                                                                           
             Please respond to                                             
             wdmaudiodev@freel                                             
                 ists.org                                                  
                                                                           
                                                                           




Some vendors use Impedance Sensing to guess the nature of the analog
peripheral connected as impedances are different from Microphones to
headphones to speakers to line level devices. It is hardly an exact science
but the results are surprisingly accurate when those who implemented it
knew what they were doing...

There was an MS white paper published on the subject but now I can't find
it on our web site. I'll keep looking.

Sincerely,

Hakon Strande | Windows Sound Team PM | (p) 425.705.0637

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of
Ernest_Burghardt@xxxxxxxxxxxx
Sent: Tuesday, November 06, 2007 9:35 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Discovery of Analog Audio Device


Hi All,

Is there a way to know what the analog audio device (i.e. speaker) that is
plugged into the jack?

Thanks in advance,
Ernie

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