acoustic absorption - определение. Что такое acoustic absorption
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Что (кто) такое acoustic absorption - определение

TRANSFER OF SOUND ENERGY INTO INTERNAL ENERGY OF THE ABSORBER
Sound absorption; Acoustic insulator
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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.
Acoustic shock         
NEGATIVE SYMPTOMS IN RESPONSE TO LOUD NOISE
Acoustic Shock
Acoustic shock is the set of symptoms a person may experience after hearing an unexpected, loud sound. The loud sound, called an acoustic incident, can be caused by feedback oscillation, fax tones, or signalling tones.
Acoustic microscopy         
  • In the plastic-encapsulated IC, gating was on a depth that included the silicon die, the die paddle and the lead frame.
  • Still scanning the top of the sample, the gating of the return echoes was then changed to include only the plastic encapsulant (mold compound) above the die. The resulting acoustic image is shown above. It shows the structure of the particle-filled plastic mold compound, as well as the circular mold marks at the top surface of the component. The small white features are voids (trapped bubbles) in the mold compound. (These voids are also visible in the previous image as dark acoustic shadows.)
  • Gating was then changed to include only depth of the die attach material that attaches the silicon die to the die paddle. The die, the die paddle, and other features above and below the die attach depth are ignored. In the resulting acoustic, shown above slightly magnified, the red areas are voids (defects) in the die attach material.
MAGNIFIED VISUALIZATION THROUGH ULTRASOUND
Ultrasonic force microscopy; Acoustic microscope; Acoustic Microscopy; Ultrasonic Force Microscopy
Acoustic microscopy is microscopy that employs very high or ultra high frequency ultrasound. Acoustic microscopes operate non-destructively and penetrate most solid materials to make visible images of internal features, including defects such as cracks, delaminations and voids.
acoustic shock         
NEGATIVE SYMPTOMS IN RESPONSE TO LOUD NOISE
Acoustic Shock
¦ noun damaged hearing suffered by the user of an earphone as a result of sudden excessive noise in the device.
Acoustic bass guitar         
TYPE OF ACOUSTIC INSTRUMENT
Acoustic bass; Acoustic bass guitars; Arco bass; Acoustic Bass guitar
The acoustic bass guitar (sometimes shortened to acoustic bass or initialized ABG) is a bass instrument with a hollow wooden body similar to, though usually larger than a steel-string acoustic guitar. Like the traditional electric bass guitar and the double bass, the acoustic bass guitar commonly has four strings, which are normally tuned E-A-D-G, an octave below the lowest four strings of the 6-string guitar, which is the same tuning pitch as an electric bass guitar.
Acoustic harassment device         
  • Law enforcement officer holding a [[Hypershield]], an acoustic hailing device used for crowd and riot control
  • An acoustic pinger ([[active sonar]]) used to repel cetaceans (including dolphins and porpoises) away from fishing nets
  • One use of [[LRAD]]s (long range audio devices) is deploying them to prevent people from entering [[line of fire]] areas
ACOUSTIC TECHNOLOGIES USED TO KEEP ANIMALS OR HUMANS AWAY FROM AN AREA
Acoustic deterrent; Acoustic deterrent device; Acoustic deterent; Acoustic deterents; Acoustic deterrents; Acoustic deterrent devices; Acoustic harassment
Acoustic harassment and acoustic deterrents are technologies used to keep animalsEncyclopedia of Marine Mammals edited by William F. Perrin, Bernd Wursig, J.
Acoustic survey in fishing         
Acoustic Survey
Acoustic survey in fishing is one of the research methods that can detect the abundance of target species using acoustic detectors.
Acoustic-electric guitar         
  • Acoustic-electric guitar with slotted headstock and an electric sound hole pickup.
STRING INSTRUMENT
Acoustic electric; Electro-acoustic guitar; Acoustic electric guitar; Acoustic Electric Guitar; Electric acoustic guitars; Electro-acoustic guitars; Electroacoustic guitar; Electric acoustic guitar; Acoustic Electric; Vintage Acoustic Electric
An acoustic-electric guitar is an acoustic guitar fitted with a microphone or a magnetic or piezoelectric pickup. They are used in a variety of music genres where the sound of an acoustic guitar is desired but more volume is required, especially during live performances.
Absorption (pharmacology)         
MOVEMENT OF A DRUG INTO THE BLOODSTREAM OR LYMPH
Absorption (Pharmacokinetics); Drug absorption; Bloodstream absorption; Absorption into the bloodstream; Absorption (pharmacokinetics); Instantaneous absorption; Zero-order absorption; Zero order absorption; First-order absorption; First order absorption; Instantaneous absorption rate; First-order absorption rate; Zero-order absorption rate
Absorption is the journey of a drug travelling from the site of administration to the site of action.
acoustic coupler         
  • Sendata Series 700
COMMUNICATION DEVICE
Accoustic coupler; Acoustic coupling; Acoustically coupled modem; Phone coupler
<hardware, communications> A device used to connect a modem to a telephone line via an ordinary handset. The acoustic coupler converts electrical signals from the modem to sound via a loudspeaker, against which the mouthpiece of a telephone handset is placed. The earpiece is placed against a microphone which converts sound to electrical signals which return to the modem. The handset is inserted into a sound-proof box containing the louspeaker and microphone to avoid interference from ambient noise. Acousitic couplers are now rarely used since most modems have a direct electrical connection to the telephone line. This avoids the signal degradation caused by conversion to and from audio. Direct connection is not always possible, and was actually illegal in the United Kingdom before {British Telecom} was privatised. BT's predecessor, the General Post Office, did not allow subscribers to connect their own equipment to the telephone line. (1994-11-08)

Википедия

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).