Glossary

The devices we use today for communications generate noise - it can be the A/C supply connected to them, the fans they have internally to keep their CPUs cool, or a myriad of other such "noise generators". While this noise may not be loud, the microphones will usually be close enough to the source of noise to pick it up.

In addition there are acoustic noises generated by air condition fans, projectors and other equipment that operates in the room.

For these there are noise suppression algorithms. For each device you develop, you will need to fine tune these algorithms to suite the noise sources around the device.