About: Diffusion (acoustics) is a research topic. Over the lifetime, 842 publications have been published within this topic receiving 10431 citations. The topic is also known as: diffusion.
Papers published on a yearly basis
TL;DR: The authors found that structural constraints are lost in the diffusion of the New York City pattern of tensing short-a to four other communities: northern New Jersey, Albany, Cincinnati, and New Orleans.
Abstract: The transmission of linguistic change within a speech community is characterized by incrementation within a faithfully reproduced pattern characteristic of the family tree model, while diffusion across communities shows weakening of the original pattern and a loss of structural features. It is proposed that this is the result of the difference between the learning abilities of children and adults. Evidence is drawn from two studies of geographic diffusion. (i) Structural constraints are lost in the diffusion of the New York City pattern of tensing short-a to four other communities: northern New Jersey, Albany, Cincinnati, and New Orleans. (ii) The spread of the Northern Cities Shift from Chicago to St. Louis is found to represent the borrowing of individual sound changes, rather than the diffusion of the structural pattern as a whole.
TL;DR: In this article, a critical frequency for thermal fluctuations is calculated above which heat transport proceeds by wave propagation rather than by diffusion, which is the analog of second sound in helium II.
Abstract: A critical frequency for thermal fluctuations is calculated above which heat transport proceeds by wave propagation rather than by diffusion. This phenomenon should occur in some dielectric solids. It is the analog of second sound in helium II. A macroscopic point of view is used which relies upon a modification in the Fourier heat equation. Some quantitative results are obtained on the magnitude of this modification.
01 Jan 2009
TL;DR: In this paper, the authors present a suite of software for room acoustics measurement, including a room optimizer, a room controller, and a room reverbator, as well as several other tools.
Abstract: Ch 1. Fundamentals of Sound Ch 2. Sound Levels and the Decibel Ch 3. The Ear and the Perception of Sound Ch 4. Speech, Music, and Noise Ch 5. Reverberation Ch 6. Absorption of Sound Ch 7. Reflection of Sound Ch 8. Diffraction of Sound Ch 9. Refraction of Sound Ch 10. Diffusion of Sound Ch 11. The Schroeder Diffuser Ch 12. Modal Resonances in Enclosed Spaces Ch 13. Sound Reflections in Enclosed Spaces Ch 14. Adjustable Acoustics Ch. 14. Control of HVAC Noise Ch. 15. Control of Interfering Noise Ch. 16. Recording Studio Acoustics Ch. 17. Studio Control Room Acoustics Ch. 18. Audio/Video Tech Room and Voice-Over Ch. 19 Home Listening Room Acoustics Ch. 20 Concert Hall Acoustics Ch. 21 Acoustical Distortion Ch. 22 Room Acoustics Measurement Software Ch. 23. Room Optimizer Ch. 24. Desktop Auralization Ch. 25. Electro-Acoustic Software for Engineers
TL;DR: A review of recent advances in the use of surface integral methods in Computational AeroAcoustics (CAA) for the extension of near-field CFD results to the acoustic far-field is given in this paper.
Abstract: A review of recent advances in the use of surface integral methods in Computational AeroAcoustics (CAA) for the extension of near-field CFD results to the acoustic far-field is given. These integral formulations (i.e. Kirchhoff's method, permeable (porous) surface FfowcsWilliams Hawkings (FW-H) equation) allow the radiating sound to be evaluated based on quantities on an arbitrary control surface if the wave equation is assumed outside. Thus only surface integrals are needed for the calculation of the far-field sound, instead of the volume integrals required by the traditional acoustic analogy method (i.e. Lighthill, rigid body FW-H equation). A numerical CFD method is used for the evaluation of the flow-field solution in the near field and thus on the control surface. Diffusion and dispersion errors associated with wave propagation in the far-field are avoided. The surface integrals and the first derivatives needed can be easily evaluated from the near-field CFD data. Both methods can be extended in orde...
TL;DR: This paper showed that sound changes do not always affect the most frequent words first; on the contrary, certain changes affect the least frequently words first, acting on underlying phonetic forms, and a direct correlation is drawn between the direction of diffusion and sound change.
Abstract: By presenting evidence from three different sound changes within the history of English, this paper demonstrates that sound changes do not always affect the most frequent words first; on the contrary, certain changes affect the least frequent words first. A comparison of sound changes exhibiting each direction of diffusion reveals that changes affecting the most frequent words first are motivated by physiological factors, acting on surface phonetic forms; changes affecting the least frequent words first are motivated by other, non-physiological factors, acting on underlying forms. Thus a direct correlation is drawn between the direction of diffusion and the actuation of sound change.
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