PORTS Forum

Ports and Interfaces => USB => Topic started by: tec on August 20, 2013, 10:17:01 am

Title: Syncing USB Microphones
Post by: tec on August 20, 2013, 10:17:01 am

Is there any prevision or standard way to synchronize multiple USB microphones?  Ideally in real time. Our product is not actually a microphone but will appear as an Audio device and act like a USB microphone.  Would it be possible to use the Start-Of-Frame marker for synchronization?  If there is a defined approach for this, I would rather use that then develop my own.

Thanks for any help or pointers.

Title: Re: Syncing USB Microphones
Post by: Jan Axelson on August 20, 2013, 12:12:01 pm

The USB audio class defines methods for synchronizing. I believe there is little support thus far for audio 2.0, so see audio 1.0, starting with section 3.3:

http://www.usb.org/developers/devclass_docs#approved

Some other reading that might be helpful:

http://www.edn.com/design/consumer/4419643/Select-your-USB-audio-MCU-with-care--Scary-stories-from-the-test-bench

http://staging.edn.com/design/consumer/4403381/USB-audio-simplified