The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 31, 2015
Filed:
Mar. 23, 2009
Henrik Fransson, Vallentuna, SE;
Henrik Fransson, Vallentuna, SE;
3M Svenska AB, Sollentuna, SE;
Abstract
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.