Microphone device including a baffle on which two or more microphone elements are disposed
View Patent ↗A microphone device according to the present disclosure includes: two or more microphone elements for picking up sounds which are disposed in spatially different locations; a baffle that has a surface on which the two or more microphone elements are disposed, and interferes with, among the sounds, a passage of a sound other than a direct sound that travels from a frontal direction in which the two or more microphone elements face and directly reaches the two or more microphone elements; and a directionality synthesizer that produces a directionality synthesized signal by performing directionality synthesis on output signals outputted by the two or more microphone elements.
1. A microphone device, comprising:
two or more microphone elements for picking up sounds which are disposed in spatially different locations;
a baffle that has a surface on which the two or more microphone elements are disposed, and interferes with, among the sounds, a passage of a sound other than a direct sound that travels from a frontal direction in which the two or more microphone elements face and directly reaches the two or more microphone elements; and
a directionality synthesizer that produces a directionality synthesized signal by performing directionality synthesis on output signals outputted by the two or more microphone elements, wherein
the baffle is in a shape of a cone, and
the two or more microphone elements are disposed at locations on the surface of the baffle such that none of the two or more microphone elements are disposed at a vertex of the cone.
2. The microphone device according to claim 1 , wherein
the baffle is disposed such that the vertex of the cone is oriented toward a front toward which the two or more microphone elements face.
3. The microphone device according to claim 2 , wherein
the surface of the baffle includes:
an upper part which is a region on which the two or more microphone elements are disposed; and
a lower part which is a base region on which the two or more microphone elements are not disposed.
4. The microphone device according to claim 1 , wherein
the directionality synthesizer produces, by performing directionality synthesis on the output signals outputted by the two or more microphone elements:
a directionality synthesized signal having sensitivity in the frontal direction; and
a directionality synthesized signal having a blind spot in sensitivity in the frontal direction.
5. The microphone device according to claim 1 , wherein
the two or more microphone elements include at least two and at most 16 microphone elements.
6. A microphone device, comprising:
two or more microphone elements for picking up sounds which are disposed in spatially different locations;
a baffle that has a surface on which the two or more microphone elements are disposed, and interferes with, among the sounds, a passage of a sound other than a direct sound that travels from a frontal direction in which the two or more microphone elements face and directly reaches the two or more microphone elements; and
a directionality synthesizer that produces a directionality synthesized signal by performing directionality synthesis on output signals outputted by the two or more microphone elements, wherein
the baffle is in a shape of a cone, and
all of the two or more microphone elements are disposed at locations on the surface of the baffle in a region that extends from a vertex of the cone to no more than approximately one third in distance from the vertex of the cone to a bottom surface of the cone.
7. The microphone device according to claim 6 , wherein
one microphone element among the two or more microphone elements is disposed at the vertex of the cone, and
the baffle is disposed such that the vertex of the cone is oriented toward a front toward which the two or more microphone elements face.