101. Physics Of Sound by Vincenti and Kruger Chapter IX (who, however, develop the acoustic equations using In this physics section there are no direct links to the Glossary links http://www.silcom.com/~aludwig/Physics/Main/Physics_of_sound.html

Physics of Sound Derivation of the equations of fluid mechanics and sound from a molecular model of an ideal diatomic gas (immediately below). General integral solution of the sound equations Green's function boundary integral. Plane and spherical wave spectra representations of sound. Cone and flat piston radiating in an infinite baffle - exact and numerical solutions. Generalized multipole technique , numerical solution method based on multipoles Point source radiating in a moving medium General solution for Doppler shift. Molecular noise and "blackbody" radiation The first topic occupies the remainder of this section, and includes a number of subtopics listed below. Comments welcome. E-mail to: aludwig@silcom.com Physics books [e.g. Feynman , and Landau and Lifshitz ] typically discuss the molecular nature of sound, but then derive the sound wave equations by modeling air as a continuous elastic medium (i.e. no lumpy molecules). Mathematically this is just fine, but I find it much more satisfying to derive the wave equations directly from the molecular point of view. I also think this is a more straightforward derivation, since it completely avoids any need to deal with "specific heat ratios" or "adiabatic processes." The effects associated with these terms arise quite naturally directly from the molecular model. This is a rather technical section, and assumes familiarity with calculus, differential equations, and statistics. There is an equation-free description of the physics of sound in the

102. Ocean Acoustics Dept: Welcome Welcome to the Ocean acoustics Department. http://depts.washington.edu/aploa/

Welcome to the Ocean Acoustics Department Movie of buried hydrophone deployment during SAX99 APL Didson acoustic camera movie of diver inspecting sand ripple field The Ocean Acoustics Department focuses on the propagation and scattering of sound in the ocean using theory and numerical modeling backed by ocean experiment. We study the effects of variability in the ocean environment on sound, the so-called "forward" ocean acoustics problem, and we exploit our understanding to solve the so-called "inverse" acoustical oceanography problem, where sound is used as a probe to study the ocean environment itself. Research spans the frequency range from a few Hertz to hundreds of kilohertz. Department staff comprises acousticians who focus on the ocean acoustics problem, acousticians who collaborate with oceanographers to develop acoustical oceanography techniques, and oceanographers who use acoustics for their research. Home About Research Education ... Abstracts

103. Physics News 448, September 16, 1999 So it came as a big surprise when Patel discovered that liquid crystals also have acoustic properties. (Kim and Patel, Applied physics Letters, 27 Sept. http://newton.ex.ac.uk/aip/physnews.448.html

Physics News 448, September 16, 1999 PHYSICS NEWS UPDATE The American Institute of Physics Bulletin of Physics News Number 448 September 16, 1999 by Phillip F. Schewe and Ben Stein Next September 1999 Main page LIQUID CRYSTAL ACOUSTICS. acoustics crystals/solids molecular CLAY OSCILLONS. Nature often sorts energy into certain preferred forms such as the unique spectrum of colors emitted by heated atoms or the characteristic note sounded by an organ pipe. This energy sorting can even turn up in a granular material. For example, a few years ago ( Update 286 ) scientists discovered that collections of tiny metal balls, when shaken slightly up and down, vested some of their energy in the form of tiny waterspout heaps called "oscillons" Now physicists at the Hebrew University in Jerusalem (Jay Fineberg, jay@vms.huji.ac.il) have observed a similar effect in a colloid, a fluid material (e.g., milk) in which tiny particles (in this case small bits of clay) are suspended in a solvent (see www.aip.org/physnews/graphics

104. The "Canceling Circles" Algorithm For Pitch Detection: As An Explenation To Visu similar repeating patterns occur. Olson, HF, Music, physics and Engineering, (2nd Ed.), New York, Dover, 1967, 460 pp. 9 That the http://www.geocities.com/Vienna/Choir/4792/wavecir.html

THE "CANCELING CIRCLES" ALGORITHM FOR PITCH DETECTION: AS AN EXPLENATION TO VISUAL ILLUSIONS by Guy Shaked New Article below! by Richard M Smith - Xerox Corp: The "canceling circles" algorithm: As an explenation to a color intensity illusion ABSTRACT This article describes a new algorithm for super fast pitch detection and pitch detection in noisy waves in speech and music sound waves. It employs a new two-dimensional filter of canceling circles for recognition of main points in the sound wave. Following, it is possible to apply two-dimensional distance measurement for estimating difference between repeating similar segments. The result of this algorithm is a rapid and accurate method of recognition of pitch. Further, it is demonstrated that the "canceling circles" mechanism can explain some audio-visual illusions and therefore possibly is a biologically oriented algorithm. 1. INTRODUCTION This is a description of a new algorithm for super fast pitch detection of pitche and pitch detection in noisy speech waves. The algorithm is applicable for other waves with repeating segments, as well as visual repeating patterns. It makes use of a new two-dimensional filter of canceling circles for recognition of main points in the sound wave. Another innovation employed is proceeding by using two-dimensional distance measurement for estimating difference between repeating similar segments, unlike the similar correlation methods of AMDF and autocorrelation [1].

105. Department Building Acoustics, Fraunhofer Institute For Building Physics Localization of sound bridges Localization of sound bridges. For discovering and solving current acoustic problems we are engaged in. Applied Research. http://www.ibp.fhg.de/ba/index_e.html

Fraunhofer-Institute of Building Physics (IBP) Building Acoustics Fraunhofer-Gesellschaft Please contact: Dr. Philip Leistner Phone: +49-711-970-3314 Fax: +49-711-970-3406 e-mail: bauakustik@ibp.fhg.de Welcome to the Department Noise Control in Buildings Environmental Noise Computation, Simulation Auralization ... Job Offers Localization of sound bridges For discovering and solving current acoustic problems we are engaged in Applied Research Innovative Development Certified Testing Competent Consultation in cooperation with industrial partners, architects, planners, standardisation and building authorities and with research institutes.

106. Welcome To The Acoustics And Fluid Dynamics Group Website For queries about this page contact Murray Campbell Last updated on September 6, 2002 at 1214 Copyright © 2002. http://www.ph.ed.ac.uk/fluids/

For queries about this page contact: Murray Campbell Last updated on September 6, 2002 at 12:14

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