The higher the sample rate, the better?
First of all, we need to understand what sampling rate is. Sample rate refers to how many sound samples the computer collects per second. Generally speaking, the higher the sampling rate, that is, the shorter the sampling interval, the more sound sample data the computer can obtain per unit of time, and the more accurate the sound waveform representation will be. sound.
So the higher the audio sample rate of the MP3 chip, the better? In principle: the higher the sample rate, the better the sound quality.
Sampling frequency is generally divided into three levels: 22.05KHz, 44.1KHz and 48KHz; 22.05 KHz can only reach the sound quality of FM radio, 44.1 KHz is the theoretical limit of CD sound quality, and 48 KHz has reached DVD sound quality. The low and high frequencies that our human ear can perceive are 20 Hz and 20 KHz, so to meet the hearing requirements of the human ear, at least 40,000 samples per second are required.
expand:
8000 Hz: the sampling rate used by phones, sufficient for human speech
11,025 Hz: the sample rate used for AM broadcasts
22,050 Hz and 24,000 Hz: sample rates used by FM radio
32,000 Hz: Sampling frequency used by miniDV digital video camera, DAT (LP mode)
44,100 Hz: Audio CD, also sample rate commonly used for MPEG-1 audio (VCD, SVCD, MP3)
47,250 Hz: the sample rate used by commercial PCM recorders
48,000 Hz: sample rate used for digital sound used in miniDV, digital TV, DVD, DAT, movies, and professional audio
50,000 Hz: the sample rate used by commercial digital recorders
96,000 or 192,000 Hz: Sample rate used by DVD-Audio, some LPCM DVD audio tracks, BD-ROM (Blu-ray Disc) audio tracks, and HD-DVD (high-definition DVD) audio tracks. )
2.8224 MHz: The sample rate used by Direct Stream Digital’s 1-bit sigma-delta modulation process
