My webcam has new drivers designed for Windows 10 versus those that were installed for Windows 7 & 8. Plus, since it may actually be your audio driver, visit the computer manufacturer or the sound card manufacturer's website and install any new audio drivers there.
Hope this helps.
I'm wondering if this is a Win 10 Anniversary bug,
I've been using my webcam mic for Google phone calls and Cortana. It's been working fine for years. Suddenly, Cortana stopped responding. I recorded my voice and heard it come back high pitched and very fast like a chipmunk. At first, to fix it, I was disabling and re-enabling the mic which worked, but it would be screwed up again after a reboot. I eventually found that the sampling rate could be changed via the advance property tab. It was set at 48 khz. Dropping it down to 16 khz made it work normally again. So I'm wondering what went wrong? Why did it work before at 48 khz? Furthermore, the problem was on my desktop computer, my tablet computer doesn't have the option of lowing the sampling rate down from 48 khz, and it works fine. Anyone know what's going on?