Hello Howard,
In this case, you are dealing with a device that is called, a digital to analog converter.
However, this device is inside of your headphone mike combo.
You are getting the audio as an analog signal, but your device is converting the bit streams of 0's and 1's in to the analog signal that you are receiving when you listen through your headphones.
The same thing is happening when you talk through your mike.
Hope this helps.
My best regards.
 John.
----- Original Message ----- From: "Howard Traxler" <[email protected]>
To: "PC Audio Discussion List" <[email protected]>
Sent: Monday, June 07, 2010 7:44 AM
Subject: audio on a USB PORT


Does anyone know how many conductors are terminated in the various types of USB connectors? Is audio actually carried on any of these conductors? Ideally it would be 6 conductors for audio: two each for stereo output, high level input, and low level input. However, it seems that anything I've read points to serial data only, and is only a port through which one could connect an external audio device. I have a stereo headset with a mic that connects to a USB port. I wonder what kind of data is being passed up that wire?

Wonder if anyone has any thoughts (or, perhaps, some real knowledge).

Thanks.
Howard

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