HANDBOOK OF ACOUSTICS - online book

A complete view of Acoustical Science & its bearings on music, for musicians & music students.

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128
CHAPTER XI!.
Combination Tones. In the preceding chapters, musical sounds, whether simple or compound, have been considered singly, and the phenomena they present, so studied. When two or more such sounds are heard simultaneously, other phenomena usually occur. In the present chapter, we proceed to study one of these.
When two musical tones, either simple or compound, are sounded together, new tones are often heard, which cannot be detected when either of the two tones is sounded by itself. For example : press
the fingers, and this tone will vanish.
These tones, which make their appearance when two independent tones are simultaneously sounded, have heen termed by some authors, Resultant Tones, by others Combination Tones. The inde­pendent tones, which give rise to a combination tone, may con­veniently be termed its generators.
Two varieties of combination tone are met with : in the one, the vibration number of the combination tone is equal to the difference