HUANG, JIUNG-YAO; SAMANI, HOOMAN A.; CHOU, YU-TING, Speaker apparatus, control method thereof, and playing control system, Patent/Publication Number: I603626, Issued/Publication Date 2017/10/21, Application Date 2016/04/26, Application Number 105112921. http://twpat1.tipo.gov.tw/tipotwoc/tipotwekm?!!FR_I603626