1. the full name of MP3 format is moving picture experts group audio layer iii. Simply put, MP3 is an audio compression technology. Because the full name of this compression method is MPEG Audio Layer3, people call it MP3 for short. MP3 uses the technology of MPEG Audio Layer 3 to compress music into a file with a small capacity with a compression ratio of 1:1 or even 1:12. In other words, it can compress the file to a smaller extent with little loss of sound quality. But also keeps the original sound quality very well. It is precisely because of its small size and high sound quality that MP3 format is almost synonymous with online music. The MP3 format of music per minute is only about 1MB, so the size of each song is only 3-4 megabytes. Use MP3 player to decompress (decode) MP3 files in real time, so that high-quality MP3 music can be played. The coding quality of MP3 is divided into fixed bit rate (CBR), average bit rate (ABR) and dynamic bit rate (VBR). Supplement: The highest bit rate is 32K, and the high-frequency part is one size fits all. The sound quality is not high! 2, WMA format WMA's full name is Windows Media Audio, which is an audio format promoted by Microsoft. WMA format aims to achieve higher compression ratio by reducing data flow but maintaining sound quality. Generally, the compression ratio can reach 1:18, and the generated file size is only half that of the corresponding MP3 file. This is very important for the model that only assembles 32M. It supports WMA and RA formats, which means that the space of 32M is expanded by 2 times invisibly. In addition, WMA can also add copy prevention through DRM(Digital Rights Management) scheme, or add restrictions on playing time and times, even playing machines, which can effectively prevent piracy. Supplement: 128kbps is the optimal compression ratio of wma, 128kbps WMA = 192kbps MP3, WAV format is a sound file format developed by Microsoft, also called waveform sound file, which is the earliest digital audio format and widely supported by Windows platform and its applications. WAV format supports many compression algorithms, and supports a variety of audio bits, sampling frequencies and channels. It uses a sampling frequency of 44.1kHz and 16-bit quantization bits, so the sound quality of WAV is almost the same as that of CD, but WAV format requires too much storage space for communication and propagation. Supplement: lossless format, disadvantages: very large volume! 4. ASF format The full name of ASF is Advanced Streaming Format, which is a media playing format developed by Microsoft and suitable for playing on the network. Windows Media On-Demand Producer is a free software for making ASF files, so that even beginners can easily make ASF files by using ready-made WAV or AVI files. Supplement: Rare format 5. AAC format AAC is actually the abbreviation of advanced audio coding. AAC is composed of Fraunhofer IIS-A, Dolby and AT&; An audio format developed by T***, which is a part of MPEG-2 specification. The algorithm adopted by AAC is different from that of MP3, and AAC improves the coding efficiency by combining other functions. AAC's audio algorithm far exceeds some previous compression algorithms (such as MP3, etc.) in compression ability. It also supports up to 48 audio tracks, 15 low-frequency audio tracks, more sampling rates and bit rates, multi-language compatibility and higher decoding efficiency. In a word, AAC can provide better sound quality on the premise that it is 3% smaller than MP3 files. Supplement: One of the best lossy formats at present. There are many kinds of coding, faac and nero are common, and the highest bit rate is 448kbps. In terms of hardware support, advanced mp3 and current mobile phones are generally supported. 6. Mp3Pro Format Mp3Pro is an upgraded version of Mp3 encoding format. MP3Pro was developed by Swedish Coding technology company, which can also compress the file size of sound files to half the original MP3 format while maintaining the same sound quality. But also can improve the original sound quality of MP3 music without basically changing the file size. It can compress audio files at a lower bit rate, and maintain the sound quality before compression to the greatest extent. MP3pro can achieve full compatibility. Files compressed by mp3Pro still have an extension of .mp3.. It can be played on the old mp3 player. Old mp3 files can be played on the new mp3pro player. Achieved what the company called "forward and backward compatibility". Supplement: mp3 compressed format, it can be said that 7. VQF format VQF format is an audio compression technology jointly developed by YAMAHA and NTT***, and its compression ratio can reach 1:18, so the compressed file volume of VQF is 3% ~ 5% smaller than that of MP3 under the same conditions, which is more convenient for online transmission, and the sound quality is excellent, close to that of CD (16-bit 44.1kHz stereo). However, VQF did not disclose the technical standards, so it has not been popular so far. Supplement: Rare 8. FLAC format FLAC is the abbreviation of Free Lossless Audio Codec, and Chinese can be interpreted as lossless audio compression coding. FLAC is a famous set of free audio compression coding, which is characterized by lossless compression. Different from other lossy compression codes such as MP3 and AAC, it will not destroy any original audio information, so it can restore the sound quality of music CDs. Now it has been supported by many software and hardware audio products. In short, FLAC is similar to MP3, but it is lossless compression, that is, audio is compressed in FLAC mode without losing any information. This compression is similar to Zip, but FLAC will give you a larger compression ratio, because FLAC is a compression method specially designed for the characteristics of audio, and you can play FLAC compressed files with the player, just like you usually play your MP3 files. Supplement: It is a lossless format. Compared with ape, it is larger, but it has good compatibility, fast coding speed and wider player support. 9.APE format APE is one of the popular digital music file formats. Different from MP3 lossy compression, APE is a lossless audio compression technology, that is to say, when you compress the audio data files read from audio CD into APE format, you can restore the files in APE format, and the restored audio files are exactly the same as before compression, without any loss. The file size of APE is about half of that of CD, but with the popularity of broadband, APE format is loved by many music lovers, especially for friends who want to transmit audio CDs through the network, APE can help them save a lot of resources. Supplement: it is lossless compression format, which is just more than flac, and it is smaller. The coding speed is slow. 1.MID format MID is the abbreviation of midi, which is its extension. MIDI is the abbreviation of English music instrument digital interface, which translates to "digital musical instrument interface", that is to say, its real meaning is the name of an interface for different devices to transmit signals. Our current MIDI music production all depends on this interface, and the information transmitted between these interfaces is also called MIDI information. MIDI was first applied to an electronic synthesizer, an electronic musical instrument played with a keyboard. Because the technical specifications of the early electronic synthesizers were not uniform, it was difficult to link different synthesizers. In August 1983, YAMAHA, ROLAND, KAWAI and other famous electronic musical instrument manufacturers jointly designated a unified digital musical instrument interface specification, which was MIDI1. technical specification. Since then, all kinds of electronic synthesizers and electronic instruments such as electronic organ have adopted this unified specification, so that all kinds of electronic instruments can be linked with each other to convey MIDI information and form a real synthetic music performance system. Due to the rapid development of multimedia computer technology and the powerful processing ability of computers for digital signals, it is natural for computers to process MIDI information. Therefore, many people now call MIDI music computer music. In fact, using multimedia computers can not only play, create and play MIDI music in real time. You can even turn MIDI music into visible music score (staff or notation) and print it out, and vice versa. Using this property of MIDI, it can be used in music teaching (especially music reading), so that students can learn music knowledge and create music by computer. 11.Ogg format The full name of OGG should be OGG Vobis(ogg Vorbis), which is a new audio compression format, similar to existing music formats such as MP3. But one difference is that it is completely free, open and without patent restrictions. OGG Vobis has an outstanding feature, that is, it supports multi-channels. With its popularity, it will not be a dream to listen to DTS-encoded multi-channel works with walkman in the future. Vorbis is the name of this audio compression mechanism, while Ogg is the name of a project, which intends to design a completely open multimedia system. At present, the plan has only realized OggVorbis. The extension of Ogg Vorbis file is. OGG. The design format of this file is very advanced. The OGG file created now can be played on any player in the future, so this file format can be continuously improved in size and sound quality without affecting the old encoder or player. Supplement: At present, one of the best lossy formats is supported by MP3, and can be supported by smart phone software, with the highest bit rate of 5kbps. 12.M4A format M4A is the extension of files of MPEG4-4 audio standard. It is mentioned in the MPEG-4 standard that the common MPEG-4 file extension is .mp4.. Since Apple began to use .m4a in its iTunes and iPod to distinguish MPEG4-4 video and audio files, the extension .m4a has become popular. At present, almost all software supporting MPEG4-4 audio supports .m4a.. The most commonly used .m4a file is in AAC format (file), but other formats, such as Apple Loss and even mp3, can also be placed in .m4a container (TC Note: the concept of this container is similar to that of .mkv file). You can safely change the extension of an audio-only .mp4 file to .m4a so that it can be played in your favorite player, and vice versa. 13.eAAC+ eaac+ format is a new generation of optimized music format applied to mobile phones. Eaac+ has the extension M4A. It can approach the sound quality of CD, and takes up less storage space than MP3 format. Summary: The common formats for music lovers are flac ape wav mp3 aac ogg wma, in which the compression ratio is aac> ogg> mp3(wma)> ape> flac> Wav is the same as sound quality) mp3 and wma take 192kbps as the dividing line, mp3 above 192kbps is good, and wma below is good. Highest sound quality: wav=flac=ape> aac> ogg> mp3> Wma (general online music network download, non-Baidu sogou download casually) wav=flac=ape=wma> aac> ogg> Among mp3 players, wma (lossless, but rare) wav is rare in hardware support: MP3 player mp3> wma> wav> flac> Ape aac ogg mobile phone mp3> wma> aac wav> flac ogg> Ape performance (that is, comprehensive sound quality volume coding rate): aac> ogg> flac ape> mp3> wav wma