Those who follow Apple must have watched its annual Technology Spring Festival Gala. In addition to the release of new Sierra Blue and pink color schemes and an upgraded camera system, the most eye-catching feature is ProMotion, which can achieve a refresh rate of up to 120Hz, which is what we commonly call high brush. So what does this 120Hz mean? What is Hz, a concept we often hear in our lives?
Before talking about frequency, we first introduce a term, namely Oscillation, which refers to the reciprocating motion of an object, such as the circular motion of the earth around the sun and swinging Simple harmonic vibration up and down. Since the reciprocating motion has periodicity, it can be described by frequency and period.
period (period), is the time required for a periodic event, the international unit is expressed in seconds (symbol: s); frequency (frequency) is the number of times a periodic event occurs per second, in international units Expressed in Hertz (symbol: Hz). Hertz is named after the German physicist Heinrich Hertz, and is often used to describe waves, communications, and computers.
That frequency will be used in many times, let’s give a simple example below to illustrate:
01, sonic span0ph133 is a typical span vibration. The sound wave is produced by the periodic vibration of air molecules, and the frequency of the vibration is the frequency of the sound. For sounds of different frequencies,People will hear different pitches. For notes of different pitches in music, the basic frequency corresponding to the number of hertz is fixed. For example, the fundamental frequency of the A sound above the center C is 440 Hz.
02, electromagnetic wave
Frequency is actually an important feature of electromagnetic wave. It refers to the frequency at which electric and magnetic fields oscillate in electromagnetic waves. The frequency corresponding to visible light is 430-790THz; and the FM broadcast frequency band of the radio that is often heard in the car is generally 87.5 to 108.0MHz.
03, CPU
In the computer field, the clock frequency of most CPUs (their CPUs) is marked in MHz or GHz. The clock frequency of the CPU is usually determined by the frequency of the crystal oscillator . This value refers to the frequency of the CPU's main clock pulse signal. Nowadays, common commercial computers generally have a clock frequency of 3 GHz (about 3 billion times per second).
04, alternating current
Hertz in alternating current represents the number of times the current direction changes within one second. The frequency of alternating current in daily life is generally 50 Hz or 60 Hz; Mainland China, Singapore and most countries in Europe use 50 Hz alternating current, while the United States uses 60 Hz alternating current.
05, refresh rate
The refresh rate refers to the number of times the monitor displays a new image per second.On the display, a higher refresh rate can reduce eye fatigue. Generally speaking, a refresh rate above 80 Hz is better for the eyes, while the frequency of common computers and mobile phones is 60 Hz, for example: Apple, Samsung, , Huawei and other new mobile phones have a maximum refresh rate of 120 Hz.
The End
Okay, the above is the frequency-related knowledge introduced by the teachers and students. I hope that the students have some understanding of frequency. Of course, if students want to experience the visual impact brought by high brush more intuitively, they might as well go to various mobile phone manufacturers experience stores to find out. In the process of understanding, if you encounter difficulties with , you can seek the help of our "most powerful brains" (Yanya professional team). I believe that with their help, they will give students good guidance.
The picture comes from the Internet.
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