A third circuit (211) determines an attenuated ambient sound level for the user from the microphone signal and an ambient sound attenuation of the earphone (105).
The composite may provide heat insulation and/or sound attenuation in a vehicular trim panel.
The shell (21) is in the cylindrical shape; the vent pipe (22) is provided with a sound attenuation part (24) and a connection part (25).
The apparatus is capable of creating images of objects immersed in fluids that are optically opaque and have high sound attenuation at resolutions less than about 1 mm.
Apparatus (10) for generating accurate 3-dimensional images of objects (20) immersed in liquids including optically opaque liquids which may also have significant sound attenuation, is described.
In a preferred composite material, three base layers are provided to impart sound deadening, sound dispersion, sound absorption, and sound durability.
The sound-absorbing device remains in working order over a prolonged operating time.
Noise Control in Multi-Family Residential Buildings
Only the most stringent acoustical environments require significant inlet silencing.
Fesco ETS and Fesco ETS 5+ have an additional layer of mineral wools to provide a different density, the result being highly effective sound reduction.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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