Patent ID: 8472656
Filing Date: 2013-06-25
Classification: H04R,Y10T

Abstract:
1. A microphone unit comprising: a housing which has an inner space; a partition member which is provided in the housing and divides the inner space into a first space and a second space, the partition member being at least partially formed of a diaphragm; an electrical signal output circuit which outputs an electrical signal based on vibrations of the diaphragm; and a first through-hole formed in the housing through which the first space communicates with an outer space of the housing and a second through-hole formed in the housing through which the second space communicates with the outer space, wherein a center-to-center distance between the first through-hole and the second through-hole is set so that a phase component intensity ratio of a user's voice which is a ratio of phase component intensity of a user's voice included in the differential sound pressure to the intensity of a user's voice included in the sound pressure incident on a first face or a second face of the diaphragm is smaller than an amplitude component intensity ratio of a user's voice which is a ratio of amplitude component intensity of a user's voice included in the differential sound pressure to the intensity of a user's voice included in the sound pressure incident on the first face or the second face of the diaphragm; and wherein a center-to-center distance between the first through-hole and the second through-hole is set so that noise intensity ratio which is a ratio of phase component intensity of a noise included in the differential sound pressure to the intensity of a noise included in the sound pressure incident on the first face or the second face of the diaphragm is less than 1.