3m Svenska Ab

3m Innovative Properties Company

3m Svenska Aktiebolag

Henrik Fransson

A hearing protector comprises two protective muffs () with passive noise damping, a microphone () disposed in at least the one protective muff () and connected to an analog and a digital signal processing device (and, respectively), the signal processing devices () being connected to loudspeakers () disposed interiorly in the protective muffs () for extinguishing interior noise in the protective muffs (). The analog signal processing device is rehearsed for processing non-repeatable noise, while the digital signal processing device is rehearsed for processing repeatable noise. According to the invention, a further microphone () is disposed outside the passive noise damping and is connected to the digital signal processing device for tracing and locking onto repeatable noise.

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Vallentuna, Sweden

Henrik Fransson