HANDS-FREE CALLING DEVICE FOR EMERGENCY NOTIFICATION SYSTEM

The purpose of the present invention is to provide a hand-free call device for an emergency notification system, wherein a speaker and a microphone are accommodated in a same housing to make an integrated speaker/microphone device while an influence of a speaker on a microphone is reduced. For the p...

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Bibliographische Detailangaben
Hauptverfasser: MIYAZAWA KIYOSHI, FUJII EIKI, FUJIMOTO YOSHITO, OKUTANI JUNICHI, TSUNEKI YASUHIRO, MURAOKA SHUNJI
Format: Patent
Sprache:eng ; kor
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Beschreibung
Zusammenfassung:The purpose of the present invention is to provide a hand-free call device for an emergency notification system, wherein a speaker and a microphone are accommodated in a same housing to make an integrated speaker/microphone device while an influence of a speaker on a microphone is reduced. For the purpose of the present invention, the call device (20) comprises: a microphone (M) composed of microphones (M1, M2) disposed on a position of symmetric axis which is a central line (CL) in a transverse direction of a housing (30), and a microphone (M3) disposed on the central line (CL) closer to a speaker (SP) than the microphones (M1, M2); a beam former unit (102) connected to the microphones (M1, M3) to form a pair of directivities (102c), wherein directivities of two directions perpendicular to the CL are strong and directivities of two directions along with the CL are weak; and a voice sound processing unit (100) connected to the beam former unit (102) and the microphone (M3) to have an echo cancel unit (103) deleting a voice sound signal outputted by the microphone (M3) from a voice sound signal outputted by the beam former unit (102). 본 발명의 과제는, 마이크에의 스피커의 영향을 저감하면서, 스피커와 마이크를 동일 하우징에 수납한 스피커·마이크 일체형의 긴급통보 시스템용 핸즈프리 통화장치를 제공하는 것을 목적으로 한다. 본 발명의 과제를 해결하기 위하여, 통화장치(20)는, 마이크(M)를, 하우징(30)의 폭방향의 중심선(CL)을 대칭축으로 하는 축 대칭의 위치에 배치된 마이크(M1),(M2)와, 스피커(SP)에 대해서 마이크(M1),(M2)보다도 가까운 중심선(CL) 상의 위치에 배치된 마이크(M3)로 구성하고, 마이크(M1),(M3)에 접속되어, 중심선(CL)과는 수직인 2 방향의 지향성이 강하고, 중심선(CL)에 따른 2 방향의 지향성이 약한 쌍 지향성(102c)을 형성하는 빔 포머부(102)와, 빔 포머부(102)와 마이크(M3)에 접속되어, 빔 포머부(102)로부터 출력된 음성 신호에서 마이크(M3)로부터 출력된 음성 신호를 제거하는 에코 캔슬부(103)를 설치한 음성 처리부(100)를 부가하여 구비한다.