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THE NATURE OF SOUND
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his throat and mouth cavities in the usual way, they act as suitable resonators and the vowels and consonants may be enunciated in a very intelligible manner.
Another illustration is given by the action of a strong wind
FIGURE 9
across the mouth when adjusted for "oh." This sound will be generated quite prominently without use of the vocal cords at all.
ANALYSIS OF SOUNDS
Devices have been constructed which give us a record of the pressure wave of any sound.
In the case of a very simple tone, like that of a tuning fork, where the fundamental alone is present, the record shows as a smooth wave ; as in Fig. 8.
But in most cases it will be more complicated, as in Fig. 9.
It has been found possible to analyze all such curves into simple components. For example, in the case just illustrated, the analysis shows that three simple components were present. (See Fig. 10.)
The analysis in Fig. 10 shows a fundamental tone (1) and two overtones or partials, (2) and (3), both of considerable intensity. As a check on such an analysis we may add together the three components (having regard to plus and minus pressure values) and, if the original curve is obtained, the analysis was correct.
Theory and practice show that there is only one analysis for a given curve and many facts lead us to believe that the ear hears the original sound just as if it had consisted of the separate individual tones shown by the analysis.
A very interesting and important result of this is the fact