| 摘要 |
<p>A sound receiver comprising:
a plurality of microphones (111, 112) that receive a sound wave;
a casing (110) that has a plurality of opening cavities (201, 202) that respectively house the microphones and through which the sound wave enters, the opening cavities not opening through a rear surface (210) of the casing and being formed in a substantially spherical shape, and the opening cavities respectively having an inner peripheral wall (301, 302); and
a plurality of supporting sponges (106) that closely contact the inner peripheral walls, and that cover surfaces of the
microphones other than surfaces to which the sound wave reaches, such that the microphones are not in contact with the inner peripheral walls, wherein the supporting sponges are formed with a material determined such that a resonance frequency of a mass of the supporting sponges and of the microphones is outside a predetermined low frequency band, and wherein
the position of the microphones is different from a volume center point of the opening cavities.</p> |
