Comparison of acoustic characteristics of headphones and earphones is a major concern during design or product selection. There are several specifications for the acoustic characteristics, such as frequency response, impedance, sensitivity, and so on. They rarely provide hints for a comparison between devices. In this study, we compared headphones and earphones by acoustical measurements to find the acoustical factors that explain the characteristics of headphones and earphones. Impulse response, correlation factors, and psychoacoustic factors were analyzed. The difference among headphones and earphones were represented by magnitude of the interaural cross-correlation function, effective duration of the autocorrelation function, and so on.
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