Nobuhisa Atoji

Headphone with two resonant peaks for simulating loudspeaker reproduction

A headphone is designed to have two resonant peaks for simulating loudspeaker reproduction. The headphone comprises a housing in which an electroacoustic transducer with a diaphragm is positioned, wherein the housing is formed with a rearward cavity positioned adjacent to the diaphragm remote from the listeners ear to provide an acoustic compliance to the generated acoustic energy. In order to generate the two resonant peaks to simulate a sensation of realism as if the listener is hearing sound from a loudspeaker, the rearward cavity is communicated with the atmosphere through apertures. The acoustic compliance of the rearward cavity coacts with the apertures to produce two resonant peaks at frequencies corresponding to the frequencies of the peaks which occur in a signal from the loudspeaker.

Binaural earphone for out‐of‐head localization

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.