Acoustic wave transformation and attenuation membrane

An acoustic wave transformation and attenuation sound proofing membrane comprising:

• an acoustic wave transformation layer;
• an acoustic absorption layer;
• and
• a constrained vibration damping layer comprising:
• a constraining face material;
• and
• a viscoelastic vibration damping layer;
• wherein the acoustic absorption layer is in between the acoustic wave transformation layer and the constrained vibration damping layer;
• wherein a structure of the sound proofing membrane, which includes the acoustic wave transformation layer, the acoustic absorption layer, and the constrained vibration damping layer, is configured to, relative to a bare concrete subfloor, reduce wavelengths of acoustic noise propagating through a concrete subfloor at each frequency within a range of 400 Hz to 3150 Hz by at least a factor of 10 when used with a non-resilient floor covering and without a suspended ceiling in the room below.

A method for creating an acoustic wave transformation and attenuation sound proofing membrane, the method comprising:

• forming an acoustic wave transformation layer;
• bonding an acoustic absorption layer to the acoustic wave transformation layer;
• bonding the acoustic absorption layer to a constraining face material;
• and
• bonding a viscoelastic vibration damping layer to the constraining face material;
• wherein a structure of the sound proofing membrane, which includes the acoustic wave transformation layer, the acoustic absorption layer, and the constrained vibration damping layer, is configured to, relative to a bare concrete subfloor, reduce impact noise by at least 12 dB at each frequency within a range of 500 Hz to 3150 Hz.