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A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.
Archiving, data management, analysis of sound recordings for bat surveys. Supports bat corder raw and wave files. PAMGuard [19] GPL v3: Windows (parts will run under Linux) Open Source software for the Detection Classification and Localisation (DCL) of marine mammal sounds. Can process hydrophone data in real time or can process files offline.
Both these type of tests and simulations allow to determine the acoustic attenuation in the far-field. Moreover, the acoustic performance is linked to the acoustic impedance which can be measured with one of the following techniques: Impedance tube or Kundt's tube; Flow-duct-facilities [5] In-situ method or Dean's method [6]
A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out – an effect which is called destructive interference .
An acoustic transmission line is the use of a long duct, which acts as an acoustic waveguide and is used to produce or transmit sound in an undistorted manner. Technically it is the acoustic analog of the electrical transmission line , typically conceived as a rigid-walled duct or tube, that is long and thin relative to the wavelength of sound ...
The attenuator is a specialty duct accessory that typically consists of an inner perforated baffle with sound-absorptive insulation. Sound attenuators may take the place of ductwork; conversely, inline attenuators are located close to the blower and have a bellmouth profile to minimize system effects.
President-elect Donald Trump is set to challenge policies aimed at boosting diversity at companies and universities when he takes office next month, throwing the weight of the U.S. government ...
Transmission loss (TL) in duct acoustics is defined as the difference between the power incident on a duct acoustic device and that transmitted downstream into an anechoic termination. Transmission loss is independent of the source, [ 1 ] [ 2 ] if only plane waves are incident at the inlet of the device. [ 2 ]