5 CLAIMS 1. Anti-noise protection device which can be used in an ear plug, comprising a modular acoustic system assembled from an acoustic 5 inlet part (3) and an acoustic output part (2), which are separated by an acoustic stack (M), and characterized in that it comprises a cone (6), oriented towards the eardrum and placed in the acoustic output part (2), whose shape is a function of a hyperbolic curve of the type f(x) = 1/x2, and an 10 acoustic resonator (5) in the acoustic output part (2), consisting of the internal volume of the cylinder of the acoustic output part (2) minus the volume occupied by the internal shape of the acoustic cone (6). 15 2. Device according to Claim 1, characterized in that said acoustic stack (M) comprises at least one porous membrane, one or more seals and one or more protective metal meshes. 3. Device according to Claims 1 and 2, characterized in 20 that the acoustic inlet part (3) and the acoustic output part (2) are assembled by adhesive bonding or by snap-fitting, compressing the acoustic stack (M) such that it is sealed over its periphery. 25 4. Device according to Claim 1 or 2, characterized in that the inlet (7) of the acoustic cone (6) is concentric with the acoustic stack (M). 5. Device according to Claim 1, characterized in that it 30 comprises a retaining region (8) allowing said device to be held in and removed from the ear plug (1) by snap-fitting. 6. Sealed ear plug, characterized in that it comprises, inside it, an anti-noise protection device according to one of 35 the preceding claims.
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