Results 111 to 120 of about 25,812 (165)
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Refractive Acoustic Devices for Airborne Sound
Physical Review Letters, 2001It is shown that a system made of periodic distributions of rigid cylinders in air acts as a new material which allows the construction of refractive acoustic devices for airborne sound. This kind of crystal, named sonic crystal, has low impedance and transmits the sound at subsonic velocities. Here, the fabrication and characterization of a convergent
F, Cervera +8 more
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Monostatic radio-acoustic sounding system
IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293), 2003Practical radar-acoustic sounding systems (RASS) generally employ a bistatic scheme with the radar source and receiver placed symmetrically beside the acoustic radiator. This paper presents a novel method to combine the acoustic and the electromagnetic waves.
M. Weiss, R. Knoechel
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SOUND REFLECTIVE ACOUSTIC PANEL
The Journal of the Acoustical Society of America, 2012A sound reflective acoustic panel includes a panel having a scored surface. The scored surface includes a plurality of substantially parallel spaced apart kerfs. The kerfs are configured to allow the panel to flex. A plurality of support ribs are attached to the scored surface of the panel. The plurality of support ribs have a curved shape and a length.
Dennis R. Kliegle, Alfonso E. Perez
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High Altitude Acoustic Soundings
SPIE Proceedings, 1985Atmospheric turbulence below 300 meters has been probed with an Echosondel acoustic sounder at the Mauna Kea, Hawaii observatory. Continuous hourly averages for several months yield "characteristic" site profiles of Cn2 and Cn2 with altitude as well as the diurnal signatures.
Fred F. Forbes +4 more
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SPIE Proceedings, 1999
For remote measurements of rains, radars have been successfully used for many years. In the last decade, high- frequency acoustic radars (sodars) are being increasingly employed to measure the parameters of precipitation. They have a number of advantages over the conventional radars.
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For remote measurements of rains, radars have been successfully used for many years. In the last decade, high- frequency acoustic radars (sodars) are being increasingly employed to measure the parameters of precipitation. They have a number of advantages over the conventional radars.
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Sound Production and Acoustic Communication
2004Fishes have evolved a diversity of sound-generating organs. These include vibrating the swimbladder and pectoral girdle by rapidly contracting muscles or rubbing bony elements against each other (stridulation) and plucking enhanced tendons. While the former mechanisms produce low-frequency, often harmonic signals (< 500 Hz), the latter usually generate
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Acoustics and orchestral sound.
The Journal of the Acoustical Society of America, 1992The tone quality of an orchestra rests on the cooperation of a multitude of differing instruments which are used partly in solo fashion and partly gathered in groups; it is furthermore shaped by the spatial extension of the ensemble and by the influence of room acoustics.
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Acoustic analysis of perceptual sound categories.
The Journal of the Acoustical Society of America, 2010Acoustic analyses were conducted on several groups of sound events. The sound events were derived from a combination of physical analyses and perceptual data. The acoustic analyses utilized both low-level properties, such as spectral centroid, and higher-level properties.
Heller, Laurie M., Skerritt, Benjamin
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Acoustical sound proofing material
The Journal of the Acoustical Society of America, 2010Panels for use in building construction (partitions, walls, ceilings, floors or doors) which exhibit improved acoustical sound proofing in multiple specific frequency ranges comprise laminated structures having as an integral part thereof one or more layers of viscoelastic material of varied shear moduli which also function as a glue and energy ...
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The Journal of the Acoustical Society of America, 1997
An acoustic imaging sound apparatus includes an acoustically reflective dome for reflecting and focusing stereophonic sound waves from stereo speakers directed into the interior of the dome. The stereophonic sound waves are focused by the dome to a listening area to provide a listener with pure stereophonic sound.
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An acoustic imaging sound apparatus includes an acoustically reflective dome for reflecting and focusing stereophonic sound waves from stereo speakers directed into the interior of the dome. The stereophonic sound waves are focused by the dome to a listening area to provide a listener with pure stereophonic sound.
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