The NoiseMaster is an active acoustic protection helmet that enhances low-frequency sound reduction where the shells are ineffective and improves the intelligibility of communications and warning signals on-site. The device consists of a shell equipped with an internal microphone which picks up the noise not treated by the traditional shell. This is connected to a miniature electronics, which drives a small loudspeaker, positioned near the ear, to provide real-time active anti-noise.
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