Category Archives: Acoustics & Sound

Secrets of Recording: Professional Tips, Tools & Techniques

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Jennifer Ouellette is a science writer who loves to indulge her inner geek by finding quirky connections between physics, popular culture, and the world at large. Probably the most significant difference is that a Helmholtz resonator has rigid walls, while the guitar body couples the air inside to the flexible top and back. Procedures, however, have been added to take into account the differences between field conditions and laboratory conditions (e.g. flanking paths, absorption, modal distribution, etc.).

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Testing Loudspeakers

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REFLECTION: The amount of sound wave energy (sound) that is reflected off a surface. The hole removes the constriction of the air at that point—it’s almost as if the tube were cut off there. The fitting of new windows may reduce the level of air ventilation, and it will be vital to compensate for this, if necessary with by improving the noise insulation of certain party walls. The animal makes a chirp or whir by moving the two body parts against each other, dragging the scraper across the file.

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The Oxford Handbook of Sound Studies (Oxford Handbooks)

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How would you use solar energy most effectively in your home or school? John Storyk, a renowned Architectural Acoustician, highly recognized though his work in recording studio designs, delivered a guest lecture "Critical Listening Environment in Recording Studios" on Mar. 4th, 2010 to RPI Architectural Acoustics graduate students at the School of Architecture. Science Olympiad is thrilled to welcome its founding sponsor, Army ROTC, back into the fold! You can get it at the publisher AK Peters/CRC Press or at Amazon.

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Evolution of Boundary Layer Height in Response to Surface

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If there are two sound sources in a room - for example a radio producing an average sound level of 62.0 dB, and a television producing a sound level of 73.0 dB - then the total sound level is a logarithmic sum ie Combined sound level = 10 x lg ( 10^(62/10) + 10^(73/10) ) = 73.3 dB Note: for two different sounds, the combined level cannot be more than 3 dB above the higher of the two sound levels. Kashyup has also built a photonic guitar, replacing the nylon strings on the frame of a standard acoustic guitar with a multimode optical fiber.

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IEC 61788-2 Ed. 1.0 b:1999, Superconductivity - Part 2:

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The "source spectrum," or plot of amplitude against frequency, for a singer is not very different from that for a nonsinger, although the spectrum does tend to slope more steeply in soft speech than it does in soft singing. Our life is a long and arduous quest after Truth. The polar plot (see image) of the transducer is close to 180°. Ball, Physical Review Letters, vol. 198, no. 7, 2012. The basilar membrane is wider at its apex than at its base near the oval window; the cochlea tapers towards its apex.

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The Design of Active Crossovers

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October 1, 2011. http://cnx.org/content/m12378/1.9/ ). An alternative description that is much easier to work with for three-dimensional problems and for deeper theoretical analysis is the Eulerian picture in which the values at a fixed point as a function of time are considered. For instance, there are settings provided to make driver integration ideal for various listening distances, compensating for the relatively different distances of bass units and treble unit to the listening position.

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LearnSmart Access Card Two Semester for University Physics

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This is achieved by introducing time delays between waves propagating from two closely spaced loudspeakers. Or may drop a coin and the sound travels that distance. A line source will produce cylindrical spreading, resulting in a sound level reduction of 3 dB per doubling of distance. In recognition of his service, he was awarded a lifetime grant of care. You may have overlooked the nature of the vertical aperture of your loudspeaker systems. In short, we estimate size based on experience (both our own and all that came before), body dimensions, soundhole(s) location.

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Acoustics for Audiologists

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Mainly a survey of sound phenomena, acoustical theory and practices, the course is highly content oriented and not demanding, mathematically. The singer does pay a price. however, since the darkened vowel sounds deviate considerably from what one hears in ordinary speech. HOW THE REGISTER HOLES WORK Most saxophones have two register holes, activated by the octave key. Dekeyser, “Acoustic diffraction effects at the Hellenistic amphitheatre of Epidaurus: Seat rows responsible for the marvellous acoustics”, J.

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Sound Systems: Design and Optimization: Modern Techniques

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A good balance between the instruments (and their amplifiers) on stage is very important. Whenever a stringed instrument is plucked, the tension of the string changes as it vibrates. D. student in the Graduate Program in Architectural Acoustics, has been appointed the Student Council Representative for the Technical Committee on Architectural Acoustics of the Acoustical Society of America. A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string.

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Digital Audio Revealed: Core Concepts Explained

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I have a long stairwell in my home with a spacing of 36.5 inches between walls. So if you have a 20 ft ceiling, sounds below 50 Hertz will distort as you increase the volume to “feel the sound.” To change the room, changing the ceiling is cheaper and better than changing the floor as the angle of the floor is limited to how long people have to stand on a sloped floor. In 2003, the Wilkinson Microwave Anisotropy Probe (WMAP) generated its own headline when it provided the most detailed microwave map of space to date.

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