The frequency range that the human ear can hear is actually between 20 Hz and 20 Hz.

The level of sound is called tone, and frequency determines tone. Pitch is also related to the structure of the vocal body, because the structure of the vocal body affects the frequency of sound.

Extended data

The frequency of international standard sound is 440Hz, that is, the number of vibrations per second is 440 times.

Based on the international standard sound A-la-440HZ:

C - do -？ 26 1.6hz； Is it? 293.6HZ

Amy-? 329.6HZ hair-hair-? 349.2 Hz;

g-sol-392hz； Ah-la-? 440 Hz;

B - si -？ 493.8 Hz.

Seven tonic sounds in c major: do re mi fa so ras (notation is 1 to 7). Scientific pitch notation is to combine the above two together to represent a sound. For example, A4 is alto la with a frequency of 440 Hz. C5 is a high-pitched do (notation is 1 plus a dot).

Raising an octave means doubling the frequency. The frequency of A5 is 880 Hz, which is exactly twice that of A4. An octave has 12 semitones, that is, the frequency interval of these two times is divided into 12, so the frequency ratio of two adjacent semitones is 2 to the power of 12, which is about 1.05946. This method of determining pitch is called 12-TET.

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