MP3 audio format. What is the bit rate?
2. MP3 (CBR, VBR, ABR)
MP3 is currently the most widely used and widely used lossy compressed digital audio format. It has been explained above and will not be repeated here.
CBR (constant bit rate)
CBR is the oldest and simplest MP3 encoding (compression) method. When this method is used for encoding, the bit rate of the entire file is the same, in other words, the bit rate used by the MP3 file per second is the same. Although the music file has sections of varying complexity, the encoder always keeps the bit rate constant, unless you use the highest sound quality, otherwise the sound quality of the different sections of the MP3 file will vary. The more complex the passage, the worse the sound quality. Its biggest advantage is that the file size is fixed, which is convenient for calculating storage space.
VBR (Variable Bit Rate, Variable Bit Rate)
VBR is a variable encoding rate MP3 compression method. Its principle is to encode the complex part of a song with a high bit rate and the simple part with a low bit rate. Through this dynamic adjustment of the encoding rate, the sound quality can be improved. additionally obtained and the size of the file. Its main advantage is that the entire song can approximately meet our sound quality requirements, but the disadvantage is that the size of the compressed file cannot be estimated during encoding.
Most MP3 players released now support VBR, but although some machines can play songs in VBR format, they can’t display the playing time correctly. Nowadays, a lot of high-quality MP3 music is encoded in VBR.
ABR (average bit rate, average bit rate)
ABR is an interpolation parameter of VBR. It is an encoding method developed on the basis of VBR. This encoding mode is created for the large file size of CBR and the variable size of files generated by VBR. ABR is within the specified file size, with every 50 frames (about 1 second for 30 frames) as a segment, low-frequency and insensitive frequencies use relatively low traffic, high-frequency and large dynamic performance use high traffic , which can be used as VBR and CBR A compromise.
