The principle is that power drives the sound tube with small protrusions on the surface to rotate at a uniform speed. When the protrusion passes through the sound bar of the soundboard, the reed will be plucked (first slowly lifted, then suddenly put down), so that the reed will vibrate at a set vibration frequency and make a set sound. The soundboard part of the music box is composed of thin strips with the same length but different thickness on the elastic steel plate (the thickness varies according to the set vibration frequency). The bulge on the sound tube is equivalent to a note on the score. Pronunciation principle of music box

A sound tube rotates according to bumps arranged regularly, and the bumps pass through the edge of the sound board. Because of the different bumps, the pronunciation is different, and with the damping effect, the sound tube rotates at a uniform speed, and an ordinary action of 8- 17 seconds is enough to express the climax of a song; Of course, high-end music boxes generally cycle between 30 seconds and 8 minutes;

There are many similarities between Japanese characters and China characters. Music box translated into Chinese is "music box". It is said that in medieval Europe, the bell tower of17th century was tuned to play music. At the end of 18, octave is designed to play monotonous music, with electric bells and electric bells as sound sources. Later, after various improvements, there were barrel octave, manual octave, humanoid automatic octave and automatic piano.