음향신호기는 횡단보도에 있는 보행신호등의 정보를 음향과 음성으로 알려주는 장치로써, 시각장애인에게 횡단보도의 이름, 음향신호기의 신호 상태 및 횡단보도의 보행 방향 정보를 제공한다. 시각장애인들은 음향신호기를 편리하게 동작시키기 위하여 358.5MHz 무선 리모컨으로 음향신호기를 동작시키고, 횡단보도를 건너가게 된다. 현재의 음향신호기는 무선 리모컨으로부터 동작 신호 수신만 가능하다. 따라서, 교차로 횡단보도와 같이 다수의 음향신호기가 설치된 교차로에서 기존의 음향신호기는 무선 리모컨의 통신 반경에 있는 음향신호기는 모두 동시에 작동하는 문제점이 있으며, 이는 시각장애인에게 혼란을 줄 수 있다. 본 논문에서는 블루투스를 이용하여 스마트폰으로 동작시킬 수 있는 양방향 통신 지원 BLE 기반 음향신호기를 제안한다. 제안하는 시스템은 상기의 문제점을 극복할 수 있으며, 신호 정보 등을 부가정보를 받을 수 있어, 횡단보도 횡단시 보다 편리하게 이용할 수 있는 장점이 있다.
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