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2. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   Automotive soundproofing aims to decrease or eliminate the effects of exterior noise, primarily engine, exhaust and tire noise across a wide frequency range. A panel damping material is fitted which reduces the vibration of the vehicle's body panels when they are excited by one of the many high-energy sound sources in play when the vehicle is ...

3. Acoustic metamaterial - Wikipedia

   en.wikipedia.org/wiki/Acoustic_metamaterial

   The spectral gaps prevent the transmission of waves at prescribed frequencies. The frequency can be tuned to desired parameters by varying the size and geometry. [7] The fabricated material consisted of high-density solid lead balls as the core, one centimeter in size and coated with a 2.5-mm layer of rubber silicone. These were arranged in an ...

4. Acoustic foam - Wikipedia

   en.wikipedia.org/wiki/Acoustic_foam

   This type of sound absorption is different from soundproofing, which is typically used to keep sound from escaping or entering a room rather than changing the properties of sound within the room itself. [11] Acoustic foam panels typically suppress reverberations in the mid and high frequencies. [11]

5. Absorption (acoustics) - Wikipedia

   en.wikipedia.org/wiki/Absorption_(acoustics)

   An example of a material in which absorption can observed: sound absorbing foam, also known as acoustic foam. In acoustics , absorption refers to the process by which a material, structure, or object takes in sound energy when sound waves are encountered, as opposed to reflecting the energy.

6. Noise reduction coefficient - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction_coefficient

   A reverberation chamber is used to test the sound absorption coefficients and NRC of a material. The noise reduction coefficient (commonly abbreviated NRC) is a single number value ranging from 0.0 to 1.0 that describes the average sound absorption performance of a material. An NRC of 0.0 indicates the object does not attenuate mid-frequency ...

7. Thin-film bulk acoustic resonator - Wikipedia

   en.wikipedia.org/wiki/Thin-film_bulk_acoustic...

   Any material like lead zirconate titanate (PZT) [7] or barium strontium titanate (BST) [8] from the list of piezoelectric materials could act as an active material in an FBAR. However two compound materials aluminium nitride (AlN) and zinc oxide (ZnO) are the two most studied piezoelectric materials manufactured for high frequency FBAR ...