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Spectrum of the noise gated by a 40-ms pulse to form ASR stimuli and presented continuously during the noise background condition. The output of the Sony MDR-V6 headphones used for ASR stimulus and background noise delivery was measured using an artificial ear (Larson Davis). The Fourier transform of the right and left headphone outputs (A-weighted) is plotted with solid and dotted lines, respectively. Magnitude is in dB re maximum.
