Download Speech Science Primer: Physiology, Acoustics, and Perception by Lawrence J. Raphael, Gloria J. Borden, Katherine S. Harris PDF

By Lawrence J. Raphael, Gloria J. Borden, Katherine S. Harris

Written in a transparent, reader-friendly variety, Speech technology Primer serves as an advent to speech technology and covers simple info on acoustics, the acoustic research of speech, speech anatomy and body structure, and speech notion. it is also issues similar to examine method, speech motor keep watch over, and history/evolution of speech technological know-how. With its reader-friendly content material and necessary on-line assets, Speech technology Primer: body structure, Acoustics, and notion of Speech, 6th version is a perfect textual content for starting speech pathology and audiology scholars and college.

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Additional resources for Speech Science Primer: Physiology, Acoustics, and Perception of Speech , Sixth Edition

Sample text

Receiving only part of the signal, we often cannot understand what is being said. RESONANCE If you have ever pushed a child in a swing, you know that you must time each push to coincide with the harmonic motion of the swing. If you run forward and push the swing while it is still moving toward you, you will simply shorten its arc. You may also be knocked to the ground if you attempt to push the swing as it passes at maximum velocity through its rest position. The frequency with which the swing completes a cycle during 1 second is the natural resonant frequency of the swing.

Notice that as time proceeds, areas of compression, in which molecules are closer together and the air pressure is higher, alternate with areas of rarefaction, in which molecules are farther apart and the air pressure is lower. For example, in time 7, a high-pressure area formed by the juxtaposition of molecules B, C, and D is surrounded by relatively low-pressure areas. By time 10, the first area of high pressure has moved farther from the sound source and now consists of particles E, F, and G.

The information it presents is thus valid only for a particular instant in time. If we want to see how harmonic amplitude varies over time, we must make a sequential series of line spectra or resort to alternative types of displays, some of which are described in later chapters. The sort of analytic process that produces a line spectrum reverses the synthetic process of adding sine waves to each other (Fig. 12). In the synthetic process of addition, as long as the simple waves being added are harmonically related, the summed wave will be periodic (and, of course, complex).

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