Of all flooring materials, carpet is the number 1 noise killer.

The choice of the right floor covering can make a crucial contribution to air
sound proofing. Indeed, carpet strongly reduces sound reverberation,
because it absorbs over ten times more airborne noise than any other
flooring material. By creating more quietness, carpet considerably enhances
the feeling of well-being.

Noise Reduction Coefficient

(Source: Dow Chemical Company)