| 摘要 |
PROBLEM TO BE SOLVED: To arrange two microphones with little interference from other components in a stable manner by effectively acquiring sound of an object side as stereo sound with high sensitivity. SOLUTION: Two microphone assemblies 3 having a main sound hole 61M one-sided to one side with respect to the center of an axis of an electret condenser microphone 4 and communicating with the back face 4B of the electret condenser microphone 4 and a sub-sound hole 61S one-sided to the other side opposite from the one side with respect to the center of an axis of the electret condenser microphone 4 and communicating with the front face 4F of the electret condenser microphone 4 with respect to the main sound hole 61M are arranged separately in the same direction. Also, the sub-sound hole 61S is provided on one face 1F of a casing 1, the main sound hole 61M is provided on another face 1R (1L) continuing to the one face of the casing 1, and a directional axis defined from the position of the sub-sound hole 61S to the position of the main sound hole 61M is set in mutually expanding angles. COPYRIGHT: (C)2007,JPO&INPIT
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