Results 131 to 140 of about 2,193,667 (187)
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Noise News International, 1993
Active noise control exploits the long wavelengths associated with low frequency sound. It works on the principle of destructive interference between the sound fields generated by the original primary sound source and that due to other secondary sources, acoustic outputs of which can be controlled.
Stephen J. Elliott, Philip Arthur Nelson
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Active noise control exploits the long wavelengths associated with low frequency sound. It works on the principle of destructive interference between the sound fields generated by the original primary sound source and that due to other secondary sources, acoustic outputs of which can be controlled.
Stephen J. Elliott, Philip Arthur Nelson
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Active noise control systems for controlling outdoor environmental noise
1999 European Control Conference (ECC), 1999A unique theory for generating electronically controlled acoustic shadows for environmental noise reduction was reported in [1]. The theory has been extended to complex high frequency sound from large non-compact sources [2] and implemented into hardware [3]. These studies show that deep acoustic shadows are possible.
S. E. Wright, H. Atmoko
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Active Shielding and Control of Noise
SIAM Journal on Applied Mathematics, 2001Summary: We present a mathematical framework for the active control of time-harmonic acoustic disturbances. Unlike many existing methodologies, our approach provides for the exact volumetric cancellation of unwanted noise in a given predetermined region of space while leaving unaltered those components of the total acoustic field that are deemed ...
Josip Loncaric +2 more
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2009
So far we have dealt with sound sources that convert electric energy into mechanic/acoustic energy. These sound sources are mainly used to radiate desired sounds because the mechanic/acoustic signals are easily controlled by the electric ones. In addition to desired sound, there is undesired sound that one would reduce or even eliminate if possible ...
Ning Xiang, Jens Blauert
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So far we have dealt with sound sources that convert electric energy into mechanic/acoustic energy. These sound sources are mainly used to radiate desired sounds because the mechanic/acoustic signals are easily controlled by the electric ones. In addition to desired sound, there is undesired sound that one would reduce or even eliminate if possible ...
Ning Xiang, Jens Blauert
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Journal of the Air Pollution Control Association, 1973
The national Environmental Protection Agency is expected to issue its recommendations on noise legislation some time during the latter part of 1973. This agency will assume primary responsibility for enforcing noise limits on new products, such as vehicles, construction equipment, electrical equipment, etc.
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The national Environmental Protection Agency is expected to issue its recommendations on noise legislation some time during the latter part of 1973. This agency will assume primary responsibility for enforcing noise limits on new products, such as vehicles, construction equipment, electrical equipment, etc.
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Noise controller which noise-controls movable point
The Journal of the Acoustical Society of America, 1994A noise controller which noise-controls a movable point so that a noise generated from a noise source and transmitted to the movable point can be reduced. The noise controller filters the noise in accordance with a least mean square algorithm and generates an antinoise to be collided with the noise so that the antinoise and the noise can cancel each ...
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Fifty Years of Noise Modeling and Mitigation in Power-Line Communications
IEEE Communications Surveys and Tutorials, 2021Tong Bai +2 more
exaly