1. Pitch: refers to the level of sound, which is determined by the number of times an object vibrates in one second (that is, the frequency in hertz). The more times of vibration, the higher the sound; If the number of vibrations is small, the sound will be low.

2. Sound value: refers to the length of sound, which is determined by the time when the object vibrates. The longer the object vibrates, the longer the sound; The vibration duration is short, and the sound is short.

3. Volume: refers to the strength of sound, which is determined by the vibration amplitude of the object. When the vibration amplitude is large, the sound is strong; If the vibration amplitude is small, the sound will be weak.