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how is frequency of sound waves and the levels in HZ that represents human voice and...

how is frequency of sound waves and the levels in HZ that represents human voice and how pitch is distingushed?

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The frequencies are divided into kHz (kilo-hertz, 1 kilo-hertz = 1000 hertz). Physically, sounds are sound waves. The unit frequency gives the number of vibrations of a sound wave / sec. The deepest test tone the human hearing organ can hear has 125 vibrations / sec. (= 0.125 kHz) and is a low buzz. The human hearing organ can thus hear a very extensive frequency range (large pitch). This means that the level of shrillness or nature of voice is determined as the pitch.

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