Acoustic device capable of producing active noise reduction

An acoustic device capable of producing active noise reduction, which may be positioned on the head of a user, comprising at least one microphone able to sense a representative sound signal of ambient noise, wherein the acoustic device comprises at least one acoustic module for active noise reduction comprising an osteophonic transducer, capable of being positioned on a side flank of the head of the user and of transmitting a vibratory signal transformed by bone conduction into an acoustic signal which may be perceived by the user,

• wherein said acoustic module is connected to said at least one microphone, and wherein said at least one acoustic module includes an electronic circuit capable of generating a vibratory signal giving the possibility of attenuating the perception of said ambient noise by the user;
• wherein said electronic circuit implements a filter defined by a transfer function for noise reduction, said transfer function being determined in order to produce noise attenuation according to direct bone conduction between the osteophonic transducer and an inner ear of the user located on a same side flank of the head of the user as said transducer;
• and
• wherein said transfer function is defined by the formula:
• H
• FO
• =
• -
• R
• ·
• H
• b
• G
• H
• m
• ·
• H
• TO
• wherein R is a ratio of a direct bone conduction transfer function and of an airborne conduction transfer function, HbG is a characteristic transfer function of ambient noise, Hm is a transfer function of said microphone, and HTO is a transfer function of said osteophonic transducer.