Point-Source Loudspeaker Reversely-Attached Acoustic Horn: Its Architecture, Acoustic Characteristics, and Application to HRTF Measurements
It is ideal to measure acoustic characteristics by point-source sound. In the case when simultaneous recording of single source by multiple microphones located at under 1 m from the source, it is difficult to regard the loudspeaker as a point-source. In this study, we propose a point-source loudspeaker whose radiation diameter is smaller than 2 cm. The loudspeaker is designed to attach the mouse of hyperbolic horn to the diaphragm of loudspeaker unit. Directional patterns of the prototype was measured at a distance of 50 cm from the radiation point in anechoic chamber. As a result, the difference of directional intensity at the frequency range of 20 - 700 Hz were within 3 dB at any combination of azimuth and elevation. At the frequency range over 700 Hz, difference of azimuthal directional intensity were within 10 dB while that of the elevational ones were within 20 dB.
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