![\"MP3](\"https:\/\/cdn4.vectorstock.com\/i\/1000x1000\/71\/48\/blue-icon-mp3-file-format-extensions-icon-vector-29057148.jpg\"){kind=icon}
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\u00fc ID3:<\/p>\n
![\"mp3](\"https:\/\/img.freepik.com\/free-vector\/modern-flat-design-mp3-file-icon-web-simple-style_599062-487.jpg\"){kind=icon}
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Usually located in several bytes at the beginning or end of an mp3 file, it records the singer, title, album name, era, style, and other mp3 file information.<\/p>\n
ID3 is divided into two versions, the V1 ID3 version is fixed at the end of the 128-word file section, it begins with the TAG character, if there is no ID3V1 information, it is considered that there is no ID3V1 information, the V2 ID3 version is found. at the beginning of mp3 and the length is variable.<\/p>\n
\u00fc Sampling rate:<\/p>\n
The number of samples extracted from a continuous signal to form a discrete signal per second. It is expressed in Hertz (Hz). Sampling rate refers to the sampling frequency when converting an analog signal to a digital signal, i.e. how many points are sampled per unit of time. The higher the sample rate, the more realistic and natural the sound will be. On today’s major capture cards, the sample rate is generally divided into three levels: 22.05 KHz, 44.1 KHz, and 48 KHz. 22.05 KHz can only achieve the sound quality of FM radio, and 44.1 KHz is the theoretical limit of CD sound quality, and 48 KHz is more accurate.<\/p>\n
\u00fc Bit rate:<\/p>\n
Bit rate refers to the number of bits (bits) transmitted per second. The unit is bps (bit per second). The higher the bit rate, the more information transmitted. In the audio and video fields, bit rate often translates to bit rate. The bit rate indicates how many bits per second the encoded (compressed) audio and video data should represent, and a bit is the smallest unit in binary. 0 or 1. The relationship between bitrate and audio and video compression is simply that the higher the bitrate, the better the quality of the audio and video, but the larger the encoded file; if the bitrate is lower, the situation is just the opposite.<\/p>\n
Bit rate = sample rate * number of samples * number of channels<\/p>\n
\u00fc Bitrate\/Stream\/Bitrate:<\/p>\n
It refers to the data stream used by audio and video files in a unit of time. The popular understanding is the sample rate, which is the most important part of quality control in audio and video encoding. Generally, the units we use are Kb\/s and Mb\/s. . Generally speaking, the higher the code stream, the lower the compression ratio and the higher the quality. The higher the code stream, the higher the sampling rate per unit time, the higher the data stream, the higher the accuracy, and the closer the processed file is to the original file.<\/p>\n
\u00fc Code:<\/p>\n
From the point of view of information theory, the data that describes the source of information is the sum of the redundancy of information and data, namely: data = information + data redundancy. The audio signal has correlation in the time domain and the frequency domain, that is, there is data redundancy. Taking audio as the source, the essence of audio encoding is to reduce redundancy in the audio.<\/p>\n","protected":false},"excerpt":{"rendered":"