Experiments were conducted with a listening panel to investigate just perceptible irregularities in electroacoustic frequency responses. Music, speech, and white noise were used as test signals. Peaks in the frequency response are far more audible than equivalent valleys or dips. Peaks are detected even when valleys of the same size are not perceptible. Intelligibility measurements made with peaks or valleys introduced in the passband of a telephone transmission system reveal that peaks reduce intelligibility more than corresponding valleys.
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