Talking about some basic differences between VBR and CBR in mp3 files
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From the perspective of bitrate encoding, one of the most common audio file formats, MP3, can be divided into two types: one is constant bitrate CBR (constant bitrate).
The bit rate of a frame is constant and unique. ; the other is Variable Bit-Rate VBR, which is the opposite of CBR. The bit rate of each frame is not fixed. The bitrate may or may not be the same. Due to the existence of these two types, some jobs that need to be done when playing mp3 files, such as getting audio information and controlling playback progress, need to be handled separately.
Introduction to some basic concepts.
To clearly understand the specific differences between CBR and VBR, you need to understand an important attribute of audio files: bit rate, also known as bitrate or bit rate, refers to the number of bits transmitted per second. The unit is bps (bits per second). The higher the bit rate, the higher the data transmission speed. Bitrate in audio refers to the amount of binary data per unit of time after converting an analog sound signal to a digital sound signal, which is an indirect measure of audio quality.
The bitrate unit of audio files is generally kbps, 1 kbps = 1000 bps. The default bitrate of mp3 is 128kbps, but the mp3 downloaded from the net is more common at 192kbps, and if you want to get high definition mp3 with better sound quality, the bitrate usually reaches 320kbps. The higher the bitrate, the better the sound quality, but the more disk space it will take up.
In general, the higher the pitch of the sound clip, the more space it needs to store and the higher the bitrate. The traditional mp3 file is encoded with CBR, that is, the bit rate of each frame is the same, which brings a problem: if the bit rate of each frame is the same, then the data size of each frame it’s the same way, no matter the pitch of this frame is high or low, the storage space of the audio frame with the highest pitch in all audio is used to store this frame, but for the audio frame with low pitch, not much storage space is needed. This will result in a loss of storage space and will virtually increase the size of the mp3 file.
