As shown in the figure: the amplitude is the difference between the peak and the trough. Look at the difference between the highest peak (peak) and the lowest peak (valley) of the waveform. The following figure is 30; Look at the cycle mainly to find a starting point, look down along the starting point, and meet the first point with the same starting point value and derivative. The distance from this point to the starting point is the cycle, the frequency is the reciprocal of the cycle, and the frequency is 1/30:

Frequency is the number of times to complete periodic changes in unit time, and it is a quantity to describe the frequency of periodic motion. It is usually represented by the symbol F or V, with the unit of one second and the symbol s- 1. In order to commemorate the contribution of German physicist Hertz, people named the unit of frequency Hertz, abbreviated as "Hertz", and the symbol was Hertz. Every object has a frequency independent of amplitude, which is determined by the nature of the object itself and is called the natural frequency. The concept of frequency is not only used in mechanics and acoustics, but also in electromagnetism, optics and radio technology.

Amplitude refers to the maximum value that the physical quantity of vibration can reach, which is usually represented by a, and it is a physical quantity representing the amplitude and intensity of vibration.