Acoustics

Acoustic Waves in Physics  An acoustic wave can simply be described as a longitudinal wave. A longitudinal wave is a wave that vibrates and moves in the direction of its propagation. This means the medium is either in the same or opposite direction of the way the wave travels. Acoustic waves are a form of Mechanical longitudinal waves; these waves are otherwise known as compression waves or compressional waves. Compressional waves obviously produce compression, decompression, and rarefaction

Introduction A range of observations were conducted to assess acoustic spaces in terms of their characteristics and ambient noise levels. Using a Digitech QM 1589 (see figure one) three studies were measured in order to successfully account for characteristic behaviours and differentiate between ambient noise levels. These studies where assessed under A and C weightings and in fast and slow settings. A weighting follows the frequency sensitivity of the human ear at low Figure One: Digitech QM 1589

Acoustic Theory and Synthesis Frequency: Frequency means the number of cycles per second and depending on the amount of cycles per second determines how high or low pitched the sound is and the time that it takes to complete one cycle is called the period. Frequency is measured in Hertz (Hz). And An average human is able to hear sounds between 20Hz and 20,000Hz. As the cycles per second increases, the smaller the wavelengths become, therefore there is a higher frequency which will cause

According to the acoustic theory of speech production, what we know to be speech output results from a source of sound energy (e.g. the larynx) modulated by a transfer (filter) function which is determined by the shape of the resonator (vocal tract). This model, often referred to as the "source-filter theory of speech production," originates from the works of Gunner Fant (1960, 1980) and Stevens and House (1955, 1961) (Haskins Laboratory, Yale University 2008). Source filter theory puts forth two

qualification of atmosphere factors perturbation in sound speed and comparing different acoustic tomography methods. Then, these techniques have been applied to series of synthetic and obtained data from field trials. This part contains tasks and activities will be provided with the aim of the PhD project as follows: • Estimate variations impact on tomography process • Develop tomographic method with acoustic variations effects • Simulation of UAV AAT using LES Data • Conduct And Analysis modeling

Concert Hall Acoustics: Focus on Chan Shun Concert Hall The Chan Centre for the Performing Arts is an acoustic marvel. It was built in 1997 and was designed by Bing Thom Architects in conjunction with Artec Consultants and Theatre Projects and is situated at the University of British Columbia. The Centre has won many awards for it’s architectural design and acoustics. David Harrington, the Artistic Director/Violinist of 
Kronos Quartet says it very well: "The Chan Centre...has the rare distinction

Acoustic Energy Conversion into Useful Electric Energy from Disk Jockey by Using Piezoelectric Ttransducers Kyrillos K. Selim1, Ayman Haggag2, H. M. Yehia3 1,2Dept of Electronics Technology, 3Dept of Mechanics Technology Faculty of Industrial Education-Helwan University Cairo; Egypt Fathy Z.Amer4, Ahmed M. El-Garhy5 4,5Dept of Electronics, communication Engineering Faculty of Engineering-Helwan University Cairo; Egypt Abstract—In this study a new noise source is proposed as a one of renewable

Another study looked at the effects of acoustic trauma in adult Cotirnix quail, and if hair cell regeneration was possible (Ryals and Rubel, 1988). The quail is used because, similarly to humans, it cannot reproduce hair cells after birth and are sensitive to ototoxicity and acoustic trauma. The animals are also relatively quick developing enough to use for such a study and allow researchers more examine the cochlea. This early paper was looking more towards physical damage to the hair cells as opposed

The Effect Mixing Has on the Wave Patterns of a Song Anna Rezhko Grade 10 Woodbridge High School January 16, 2014 Miss Cooper Abstract The purpose of the experiment was to find the objective difference between an original song and an acoustic or a remix version of the same song. The expectation was that the difference lies in the amount of contrast between the highest and lowest amplitude. Sound waves are created when an object vibrates back and forth and they have amplitudes, wavelengths, and

The experiment was measured in terms of its pitch in order to find the best tone from the clarinet. The pitch and the sound of clarinet is really dependent on its reed. (3) There are several different sizes, or thicknesses, of reeds and the 3½ reed would be able to produce the most in-tune pitch. The sound stays as important matter in our life; it is the natural potential of most organisms and also the one that would used the most essentially. Sound is the awareness produced by stimulation of an