Helmets

By Chung-Ying Ho, Ting-Kuo Yeh (何宗穎、葉定國)

Helmet is an important equipment when riding motorcycles. A lot of people travel and commute using motorcycles. However, motorcycle noise can reach 95 dB at high speed. After riding for a long time, the hearing might be damaged by loud and continue noise. Therefore, active noise control (ANC) technique is developed to produce quiet zones around ears to protect riders' hearing. Meanwhile, communication and audio functions can also be integrated in helmet ANC system.