Acoustics & Sound For Musicians - Online Book

The Theory Of Sound Which Constitutes The Physical Basis Of The Art Of Music.

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158 NUMBER of beats per second,
other in that time. We may express this result more briefly as follows :—
The number of beats per second due to two simple tones is equal to the difference of their vibration -numbers.
77. By means of the associated wave-forms we can obtain a graphic representation of beats, which will probably be more directly intelligible than any verbal description. In Fig. 56, the constituent simple waves are laid down, and their resultant is constructed, for the interval of a semi-Tone. The
vibrations of the higher tone are performed in the same time as 15 of the lower. The figure repre­sents completely the state of things from a maxi­mum of intensity to the adjacent minimum. The time during which this change occurs is one-half of that above-mentioned : accordingly the figure shows
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