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An acoustic metamaterial, sonic crystal, or phononic crystal is a material designed to control, direct, and manipulate sound waves or phonons in gases, liquids, and solids (crystal lattices). Sound wave control is accomplished through manipulating parameters such as the bulk modulus β, density ρ, and chirality. They can be engineered to ...
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. Part of the absorbed energy is transformed into heat and part is transmitted through the absorbing body.
KEF is the first company in the HiFi industry to use metamaterial to absorb the unwanted sound from the rear of a speaker driver; the technology is called Metamaterial Absorption Technology (MAT). KEF has received over 300 awards and holds more than 150 patents.
A metamaterial (from the Greek word μετά meta, meaning "beyond" or "after", and the Latin word materia, meaning "matter" or "material") is a type of material engineered to have a property, typically rarely observed in naturally occurring materials, that is derived not from the properties of the base materials but from their newly designed ...
Acoustics is a branch of continuum mechanics and is the study of sound, ... Absorption (acoustics) ... Acoustic metamaterial; Acoustic metric; Acoustic mirror;
A laboratory metamaterial device, applicable to ultra-sound waves was demonstrated in January 2011. It can be applied to sound wavelengths corresponding to frequencies from 40 to 80 kHz. The metamaterial acoustic cloak is designed to hide objects submerged in water. The metamaterial cloaking mechanism bends and twists sound waves by intentional ...