Hertz is the frequency unit in the international system of units, and it is a unit to measure the number of repetitions of periodic changes per second. Hertz is also a unit of frequency in the international system of units. It measures the number of repetitions of periodic changes per second. Hertz's name comes from the German physicist heinrich rudolf hertz. Its symbol is Hz.

1Hz = 1/s, that is, the number of times to complete the vibration in unit time, in hertz (1Hz = 1 times/second). Hertz is mainly used to measure the frequency of sound.

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Commonly used frequency units are kilohertz (kHz), megahertz (MHz), gigahertz (GHz) and so on.

The information electric signal sometimes contains many frequency components, all of which are plotted on the frequency axis, indicating the magnitude of each power or voltage component, that is, the "frequency spectrum" of the signal. The frequency range it occupies is called the frequency band range of the signal. For example, in telephone communication, the frequency range of voice signal is 300-3400 Hz; ; In FM broadcasting, the frequency range of voice is 40-15 khz; In TV broadcasting, the frequency range of sound signal is 0-4.2 MHz.

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