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(Top) Center-target to left-ear impulse response recorded inside the classroom shown in Fig. 5. The reverberation time T60 of this enclosure ranges from 150 to 300 ms depending on the source-to-sensor distance. (Bottom) Energy decay curves of the left-ear (solid line) and right-ear (dash line) impulse responses at 30°. The time taken for the amplitude to drop by 60 dB (thick line) below the original sound energy level is equal to 300 ms.
