[cliftonc]

Why not use a headset? They work really well at blocking out background noise (we use the plantronics ones). Worth every cent.

[jbergens]

Those don't block out your sound, the others in the same room still hears you and get disturbed.

[eneveu]

Just use Hushme and look like Bane /s

http://gethushme.com/

https://www.youtube.com/watch?v=w2wF8LOV5kw