acoustic absorption - translation to greek
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acoustic absorption - translation to greek

TRANSFER OF SOUND ENERGY INTO INTERNAL ENERGY OF THE ABSORBER
Sound absorption; Acoustic insulator

acoustic absorption      
ακουστική απορρόφηση
ακουστική απορρόφηση      
acoustic absorption
sound wave         
  • oscillating]] usually at the same [[frequency]]. One of the forks is being hit with a rubberized mallet. Although only the first tuning fork has been hit, the second fork is visibly excited due to the oscillation caused by the periodic change in the pressure and density of the air by hitting the other fork, creating an [[acoustic resonance]] between the forks. However, if we place a piece of metal on a prong, we see that the effect dampens, and the excitations become less and less pronounced as resonance isn't achieved as effectively.</small>
  • Figure 2. Duration perception
  • date=19 August 2007}}</ref>
  • Figure 3. Loudness perception
  • Figure 1. Pitch perception
  • Sinusoidal waves]] of different frequencies. The bottom waves have higher frequencies than those above. The horizontal axis represents time.
  • Spherical compression (longitudinal) waves
  • A 'pressure over time' graph of a 20 ms recording of a clarinet tone demonstrates the two fundamental elements of sound: Pressure and Time.
  • Figure 4. Timbre perception
  • Approximate frequency ranges corresponding to ultrasound, with rough guide of some applications
VIBRATION THAT PROPAGATES AS AN ACOUSTIC WAVE
Radiation of sound; Sounds; Sound wave; Sound waves; Auditory Range; Auditory range; Airborne sound; Acoustic Radiation; Sound propagation; Acoustic energy; Characteristics of sound; Sonida; Duration of sound; Sound duration
ηχητικό κύμα

Definition

acoustic shock
¦ noun damaged hearing suffered by the user of an earphone as a result of sudden excessive noise in the device.

Wikipedia

Absorption (acoustics)

Acoustic 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. The energy transformed into heat is said to have been 'lost'.

When sound from a loudspeaker collides with the walls of a room part of the sound's energy is reflected, part is transmitted, and part is absorbed into the walls. Just as the acoustic energy was transmitted through the air as pressure differentials (or deformations), the acoustic energy travels through the material which makes up the wall in the same manner. Deformation causes mechanical losses via conversion of part of the sound energy into heat, resulting in acoustic attenuation, mostly due to the wall's viscosity. Similar attenuation mechanisms apply for the air and any other medium through which sound travels.

The fraction of sound absorbed is governed by the acoustic impedances of both media and is a function of frequency and the incident angle. Size and shape can influence the sound wave's behavior if they interact with its wavelength, giving rise to wave phenomena such as standing waves and diffraction.

Acoustic absorption is of particular interest in soundproofing. Soundproofing aims to absorb as much sound energy (often in particular frequencies) as possible converting it into heat or transmitting it away from a certain location.

In general, soft, pliable, or porous materials (like cloths) serve as good acoustic insulators - absorbing most sound, whereas dense, hard, impenetrable materials (such as metals) reflect most.

How well a room absorbs sound is quantified by the effective absorption area of the walls, also named total absorption area. This is calculated using its dimensions and the absorption coefficients of the walls. The total absorption is expressed in Sabins and is useful in, for instance, determining the reverberation time of auditoria. Absorption coefficients can be measured using a reverberation room, which is the opposite of an anechoic chamber (see below).