# Does the higher the sampling rate of the mp3 chip correspond to the higher the sound quality?

Sampling rate, also known as sampling frequency, refers to how many sound samples the computer collects per second. It describes the sound quality and tone of the sound file, and measures the quality standard of the sound card and sound file; generally speaking, the higher the sampling frequency, the sampling interval time The shorter it is, the more sound sample data the computer can obtain in a unit time, and the more accurate the representation of the sound waveform.

What is the sampling rate

Sampling rate, also known as sampling frequency, refers to how many sound samples the computer collects per second. It describes the sound quality and tone of the sound file, and measures the quality standard of the sound card and sound file; generally speaking, the higher the sampling frequency, the sampling interval time The shorter it is, the more sound sample data the computer can obtain in a unit time, and the more accurate the representation of the sound waveform.

So, is the higher the sampling rate, the higher the corresponding sound quality?

The lowest and highest frequencies that the human ear can perceive are 20Hz and 20KHz. Therefore, to meet the hearing requirements of the human ear, it is necessary to sample at least 40k times per second. So does sampling higher than 40K improve the sound quality heard by human ears?

In fact, according to the Nyquist sampling theory, the sampling frequency of most mp3 decoding chips must be twice the highest frequency of the signal. For example, the frequency of an audio signal generally reaches 20 Hz, so its sampling frequency generally requires 40 Hz. The human ear can only listen to the range below 23Khz, so the CD sampling rate is only 44.1Khz. 22Khz×2=44Khz, considering a certain margin, 44.1Khz is adopted. Therefore, the daily general sampling frequency is 11KHz (collecting sound samples 11 thousand times per second), 22KHz, 44.1KHz and 48KHz, and the sound scale obtained by the sampling rate of 11KHz It is telephone sound quality, which basically allows you to distinguish the voice of the caller; 22KHz is called broadcast sound quality; 44.1KHz is called CD sound quality. The sound quality of more than 44.1KHz conveys the effect of “distortion” to the human ear. At this time, the higher the sampling rate, the higher the “distortion”, and it can even reach the point where the human ear can’t hear it, the “ultrasonic” of the four cities.

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