[Study on effects of combined hearing protector on communication quality and noise protection].

To study the communication quality and the protection effects of single protector and the combined ones, sound attenuation experiments and the communication experiments were conducted in 14 male subjects. The results showed that the sound attenuation of combined protectors were 13 dB or 6dB more than that of single earplug or earmuff respectively, and combined protectors could avoid sound attenuation caused by the harmonics on some frequency bands in single one. After combined usage, the single protector reduced the distortion which came from the overload of hearing organs and maintained the communication quality. The combined protector is an effective hearing protection device in high noise environment in aerospace field.