Results 221 to 230 of about 26,557 (265)

Acoustic analysis of perceptual sound categories.

The Journal of the Acoustical Society of America, 2010
Acoustic 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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Sound Production and Acoustic Communication

2004
Fishes 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, 1992
The 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 sounding of the atmosphere

Endeavour, 1978
Abstract Measurement of vertical and horizontal wind velocity is of great importance in many contexts, such as investigation of air pollution, weather forecasting, and air-traffic control. In recent years continuously recording acoustic sounders have been developed which give reliable results at reasonable cost: some 200 are now in use in at least 15
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Sound restoration in damaged acoustical recording

[Proceedings] ICASSP-92: 1992 IEEE International Conference on Acoustics, Speech, and Signal Processing, 1992
Modeling of an acoustical signal in transformed form is presented. The signal is transformed to the frequency domain, and the behavior of each spectral component is modeled. Estimation of each spectral component for a time frame is made from the individual models. The spectral frame is then transformed into the corresponding time frame. The application
K. S. Jog, Ajay Ingle
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Monostatic radio-acoustic sounding system

IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293), 2003
Practical 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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Combined Radar-Acoustic Sounding System

Applied Optics, 1972
Acoustic pulses at 85 Hz (4 m) directed vertically into the lower atmosphere have been tracked by a 36.8-MHz (8-m) pulse doppler radar. Signal-to-noise power ratios in excess of 10 dB were obtained to a height of 1.5 km in the initial tests under conditions of calm winds.
J M, Marshall, A M, Peterson, A A, Barnes   +2 more
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Acoustic archaeology: sound science or sound and fury?

New Scientist, 2010
The idea that our ancestors built for acoustic effect has recently been gaining ground. But how much is design, and how much accident?
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Acoustics and Aerodynamic Sound

2014
Music, calm speech, whispering leaves fluttering in a breeze are pleasant and desirable sounds. Noise, howling gales, explosions and screeching traffic are less so. A quantitative understanding of the sources of all such sounds can be obtained by careful analysis of the mechanical equations of motion. This is provided by Acoustics and Aerodynamic Sound,
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ACTIVE CONTROL OF ACOUSTIC FIELDS AND THE REPRODUCTION OF SOUND

Acoustics '93, 1994
Abstract In recent studies of the active control of acoustic fields analytical methods and multi-channel signal processing techniques have been used that can be usefully applied to problems in sound reproduction. In this paper several aspects of the reproduction of sound are considered. First, the possibility is considered of the perfect reproduction
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