I am newbee in this field .I want to Develop USB audio system for that I have decided to use USB to Serial Converter. My problem is How PC will recognize that connected USb device is AUDIO i/o and redirect audio stream to it.
Which format it uses for the audio data.
Do I need to write saperate USb audio drivers for the same???
Take a look at BurrBrown PCM2702. This is a usb to Audio converter, quite easy to use. Windows does have a usb audio driver. This is loaded during usb enumeration. Download the specs for usb hid devices.
Maybe look at the Pic micros with full speed usb. You need to enumerate as a usb adio device when you plug in, then windows will load the right driver. Windows does support usb audio devices.
The place for info is usb.org.