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SAE Technical Paper Series, 1974
<div class="htmlview paragraph">This paper describes a variety of methods employed in the past to modify or suppress jet noise. Some of the intriguing aspects of the factors that contribute to noise suppression are brought out. The paper concludes that a systematic study of the physics of jet suppression, in place of the ad hoc methods used in ...
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<div class="htmlview paragraph">This paper describes a variety of methods employed in the past to modify or suppress jet noise. Some of the intriguing aspects of the factors that contribute to noise suppression are brought out. The paper concludes that a systematic study of the physics of jet suppression, in place of the ad hoc methods used in ...
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High Noise suppression microphone
The Journal of the Acoustical Society of America, 2002A noise suppressing microphone employing a thin film of piezoelectric material sandwiched between two conductive layers, one of which is laminated to a flat inflexible laminate. The sandwich is embedded in a mechanical sound filter except for one exposed face which is placed in contact with a user's body for sound pickup.
Edward F. Downs, Kevin M. Venturella
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The Journal of the Helicopter Association of Great Britain, 1959
The Chairman, in opening the meeting, said that after all the comment in the Press in the last few days concerning the noise of helicopters flying over London and in view of the possibility of further comment in the immediate future because of the existence now of a heliport in London, it was opportune that the Association should be having a lecture ...
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The Chairman, in opening the meeting, said that after all the comment in the Press in the last few days concerning the noise of helicopters flying over London and in view of the possibility of further comment in the immediate future because of the existence now of a heliport in London, it was opportune that the Association should be having a lecture ...
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The Journal of the Acoustical Society of America, 2010
In a noise suppression structure of the present invention, a sound absorption sheet is pinched between a flange of a speaker grille and an interior trim. An opening of a space formed by the flange of the speaker grille and a sound guiding tube is covered with the sound absorption sheet.
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In a noise suppression structure of the present invention, a sound absorption sheet is pinched between a flange of a speaker grille and an interior trim. An opening of a space formed by the flange of the speaker grille and a sound guiding tube is covered with the sound absorption sheet.
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Water, Air, and Soil Pollution, 1973
Noise control in the Department of Defense is discussed in terms of the Noise Control Act of 1972.
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Noise control in the Department of Defense is discussed in terms of the Noise Control Act of 1972.
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The Journal of the Acoustical Society of America, 1992
A noise suppression apparatus has a main microphone for mainly picking up a voice and for outputting an input signal including an audio signal and a first noise component generated from a noise source, a reference microphone for picking up a second noise component generated from the noise source, a filter bank for band-dividing the input signal from ...
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A noise suppression apparatus has a main microphone for mainly picking up a voice and for outputting an input signal including an audio signal and a first noise component generated from a noise source, a reference microphone for picking up a second noise component generated from the noise source, a filter bank for band-dividing the input signal from ...
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Ambient noise suppression circuit
The Journal of the Acoustical Society of America, 1999An ambient noise suppression electrical circuit to be used with a voice communication terminal comprising a gain control amplifier, whose input is a microphone, and a peak-hold circuit that includes a band-pass amplifier that amplifies a specified frequency range of the output signals of the microphone, a peak detection circuit that produces signals in
Noboru Yamaguchi, Masao Konomi
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The Journal of the Acoustical Society of America, 1985
A noise suppression panel having a first cellular core positioned between and bonded to an imperforate facing sheet on one surface thereof and a first sheet of microporous material on the other surface. A second core is bonded between the other surface of the first sheet of microporous material and a perforated sheet.
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A noise suppression panel having a first cellular core positioned between and bonded to an imperforate facing sheet on one surface thereof and a first sheet of microporous material on the other surface. A second core is bonded between the other surface of the first sheet of microporous material and a perforated sheet.
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The Journal of the Acoustical Society of America, 1990
An improved centrifuge. The centrifuge may be a conventional centrifuge having a rotor and a plurality of tube receiving adaptors inserted into the rotor in a circular configuration. The improvement comprises a flexible flap having a fixed end mounted on the rotor at an adaptor and having an opposing free end.
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An improved centrifuge. The centrifuge may be a conventional centrifuge having a rotor and a plurality of tube receiving adaptors inserted into the rotor in a circular configuration. The improvement comprises a flexible flap having a fixed end mounted on the rotor at an adaptor and having an opposing free end.
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Coherent Optical Noise Suppression Device
Applied Optics, 1974In optical data processing the quality of the output image is usually degraded by diffraction noise generated by the optical components of the system. The suitability of previously suggested techniques to a dc spatial filtering processor is discussed.
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