The USB cameras we typically purchase not only include the camera itself but also, in most cases, a USB microphone. These devices adhere to the USB Common Driver Profile specification, and under Windows, the USB driver USBCCGP.sys is used to enumerate their subdevices.
For example, with a UVC camera in hand, the Windows system enumerates it based on its interface descriptor, identifying both a UVC camera and a UAC microphone.
Therefore, UVC and UAC correspond to two distinct device class specifications within USB. They are often encountered together in everyday use simply because they coexist.
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