stereophonic AK-900, Сборка и инструкция по эксплуатации

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Now consider the following two tones, which differ slightly in frequency:
If they are played at the same time then their sound waves would be added together to produce:
Notice that the combined wave has a regular pattern of where the two tones add together and where they cancel
each other out. This is the effect that produces the
beat you hear in music. Two tones (that are close in
frequency and have similar amplitude for their fundamental and for each of their overtones) will beat at the rate
of their frequency difference.
Rhythm is the pattern of regular beat that a song has.