PURPOSE: To prevent voice of a speaker from introducing crosstalk to a microphone by placing a speaker to a position where sound is received omnidirectionally within a plane including 2 directivity microphones or over and the sensitivity is minimized and making the direction coincident with the sound transmission direction.
CONSTITUTION: The device consists of a main body 2 having a speaker 1 for talking and one sub case 3 or over removable therefrom, and two directional microphones 10, 11 or over are mounted to the one sub case 3 or over. In this case, the device is configurated such that it is possible for nondirectivity sound reception within a plane including the directivity microphones 10, 11, the position minimizing the sensitivity is a position of the said speaker 1 and the direction minimizing the sensitivity is made coincident with the sound transmission direction of the speaker 1. That is, the directivity 6 within a plane including ≥two microphones 10 is omnidirectional in this arrangement and a region 62 is a region where its sensitivity is minimized in a direction at a right angle with respect to a face including the two microphones 10 or over. Thus, the sound from the speaker 1 does not introduce crosstalk to the microphones 10.
FUJII KENSAKU
MASUDA HIROYUKI
HOSHINO TSUTOMU
OGA TOSHIRO
