Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(Color online) Effect of different masks on sound levels measured at the listener position for a head-shaped loudspeaker (left) and human talker (right). Human speech attenuation values are means over three recordings. The overall standard deviation between human recordings was between about 1 and 2 dB at the plotted frequencies.
