Figure 3
From: Active control of broadband sound through the open aperture of a full-sized domestic window
Moving-average sound pressure level as a function of time before active control 
, after active control 
, and with windows fully shut without active control 
. Cases shown for 100 Hz to 1 kHz bandlimited (a) MRT pass-by noise, and (b) aircraft fly-by noise. The spectrograms before control (c,d), after control (e,f), and windows fully closed (g,h) are shown for MRT and aircraft noise, respectively.
