. Elements of acoustical engineering. Electro-acoustics; Sound. SOUND WAVES 3 condensations); the points below represent negative pressures (expansions, rarefactions) with respect to the normal atmospheric pressure represented by the straight line. From the above examples a few of the properties of sound waves and vibrations in general may be BOARD Fig. Production of sound waves by a vibrating piston. Periodic Quantity. — A periodic quantity is an oscillating quantity the values of which recur for equal increments of the independent variable. Cycle. — One complete set of recurre
. Elements of acoustical engineering. Electro-acoustics; Sound. SOUND WAVES 3 condensations); the points below represent negative pressures (expansions, rarefactions) with respect to the normal atmospheric pressure represented by the straight line. From the above examples a few of the properties of sound waves and vibrations in general may be BOARD Fig. Production of sound waves by a vibrating piston. Periodic Quantity. — A periodic quantity is an oscillating quantity the values of which recur for equal increments of the independent variable. Cycle. — One complete set of recurrent values of a periodic quantity comprises a cycle. Or, in other words, any one set of variations starting at one condition and returning once to the same condition is a cycle. Period. — The period is the time required for one cycle of a periodic quantity. Frequency. — The number of cycles occurring per unit of time, or which would occur per unit of time if all subsequent cycles were identical with the cycle under consideration is the frequency. The unit is the cycle per second. Fundamental Frequency.—A fundamental frequency is the lowest com- ponent frequency of a periodic wave or quantity. Harmonic — A harmonic is a component of a periodic wave or quantity having a frequency which is an integral multiple of the fundamental fre- quency. For example, a component, if the frequency of which is twice the fundamental frequency, is called the second harmonic. Subharmonic. —A subharmonic is a component of a complex wave having a frequency which is an integral submultiple of the basic frequency. Wavelength. —The wavelength of a periodic wave in an isotropic medium is the perpendicular distance between two wave fronts in which the dis- placements have a phase difference of one complete Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may n
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