Figure 1.

(A) Frequency spectrum of WTN during 2-h periods with filters simulating window ajar and window closed scenarios. The spectra were identical for the low and high AM cases. (B) Eight-hour nocturnal noise exposure with additional 1-h lead-in noise. In this example, the constituent 2 h scenarios are in the order low AM/closed window, low AM/ajar window, high AM/closed window, high AM/ajar window. The periodicity of WTN level within each 2-h period is due to random time-varying fluctuations introduced into the 10-min synthesized file, which was repeatedly played back within the 2-h period.