This paper describes a binaural sound reproduction system which converts a monaural electric signal to a sound wave by an electroacoustic transducer and transmits the converted sound wave through acoustic transmission paths such as tubes to the left and the right ears of listener. This system has a reverberation unit comprising a pure mechanoacoustic element which produces two indirect sounds. These indirect sounds have a time delay relative to the direct sound and a phase difference of 180° from each other, and are mixed with the direct sound for each ear. These mixed sounds are transmitted through the acoustic transmission paths to the left and the right ears so that a sound image is localized externally of the head of the listener. As mentioned above, this paper presents the construction of the binaural earphone for out-of-head localization.
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