The sampling frequency is to use a piece of audio as a sample. Because WAV uses a digital signal, it uses a bunch of numbers to describe the original analog signal, so it needs to analyze the original analog signal. We know that all sounds have their own waveforms. The digital signal is to "take points" at regular intervals on the original analog signal waveform, and assign a value to each point. This is "sampling", and then all the "sampling" is done. The analog signal can be described by connecting "points". Obviously, the more points taken within a certain period of time, the more accurate the waveform will be described. This scale is called "sampling frequency". Our most commonly used sampling frequency is 44.1kHz, which means 44,100 samples per second. The reason why this value is used is because after repeated experiments (actually it was the legacy of the video 27/1.0001 clock for CD burning in that era), people found that this sampling frequency is the most suitable. If it is lower than this value, there will be obvious losses. , and above this value it is difficult for human ears to distinguish, and it increases the space occupied by digital audio. Generally, in order to achieve "extremely accurate", we will also use a sampling frequency of 48kHz or even 96kHz. In fact, the difference between the 96kHz sampling frequency and the 44.1kHz sampling frequency will never be as big as the difference between 44.1kHz and 22kHz. The sampling frequency we use The sampling standard of CD is 44.1kHz. Currently, 44.1kHz is still the most popular standard. Some people believe that 96kHz will be the trend in the recording industry in the future. Increasing the sampling frequency should be a good thing, but can we really hear the difference between music produced with a 96kHz sampling frequency and music produced with a 44.1kHz sampling frequency? However, with the popularization of high-end audio equipment, we may be able to hear higher quality music at parties.

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