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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.
The vestibular fold (ventricular fold, superior or false vocal cord) is one of two thick folds of mucous membrane, each enclosing a narrow band of fibrous tissue, the vestibular ligament, which is attached in front to the angle of the thyroid cartilage immediately below the attachment of the epiglottis, and behind to the antero-lateral surface of the arytenoid cartilage, a short distance above ...
Acoustic attenuation in water is frequency-squared dependent, namely =. Acoustic attenuation in many metals and crystalline materials is frequency-independent, namely =. [10] In contrast, it is widely noted that the of viscoelastic materials is between 0 and 2.
The acoustic reflex (also known as the stapedius reflex, [1] stapedial reflex, [2] auditory reflex, [3] middle-ear-muscle reflex (MEM reflex, MEMR), [4] attenuation reflex, [5] cochleostapedial reflex [6] or intra-aural reflex [6]) is an involuntary muscle contraction that occurs in the middle ear in response to loud sound stimuli or when the person starts to vocalize.
The waves originated by the airflow modulated by the vibrating vocal folds travel along the bones, cartilages, and muscles of the neck, head, and upper chest, causing them to vibrate by forced resonance. There is little evidence that these vibrations, sensed by tactile nerves, make any significant contribution to the external sound. [6]
Bone conduction hearing aids have also been fitted to glasses, which fit tightly to the side of the head. [ 13 ] In the 1970s, a team of doctors in Gothenburg , most notably Anders Tjellström, had the idea to implant a bone vibrator plate into the mastoid bone with an adjoining screw that allowed an external audio processor to be attached to ...
P. Palatine aponeurosis; Palatopharyngeus muscle; Paranasal sinuses; Parietal bone; Pars intermedia; Patulous Eustachian tube; Peripharyngeal space; Pharyngeal pouch ...
1 Additional images. 2 References. ... Anterolateral view of head and neck (supraclavicular fossa labeled at center right) ... Diagram at droid.cuhk.edu.hk