To grasp the mechanism, a brief look at acoustics is helpful. Sound propagates through air as vibrational patterns that ultimately vibrate your eardrums. Wave frequency, measured in oscillations per second, determines the perceived pitch. Lower frequencies, such as aircraft engine hum, are heard as deep tones, while higher frequencies, like emergency sirens or barking, are perceived as sharp, high-pitched sounds.
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Свитер со «Смешариками» от российской дизайнерши стал интернет-сенсацией14:49