Randy Houser - Anything Goes

BEATS - periodic. attenuation and amplification of the volume, felt when two (or several) sounds are heard simultaneously, so close in frequency that they cannot be perceived separately by the ear. B. frequency of the resulting tone is equal to the frequency difference of the combined sounds. So, the sounds of la with a frequency of 440 count. / sec and 435 count / sec. give B. with a frequency of 5 counts / sec. B. arise not only between DOS. tones of complex sounds, but also between overtones. B.'s phenomenon is used at tuning of muses. instruments, in particular for obtaining pure unions and octaves, tempered fifths and quarts. At some muses. B. instruments are sometimes specially introduced to revitalize the sound and obtain a special coloring of the sound (for example, the so-called “flood” setting on the accordion). E.V. Nazaikinsky.