overview of music formats as the most classic Windows multimedia audio format, the classic WAVE WAVE is widely used. It uses three parameters to represent sound: sampling bit number, sampling frequency and channel number. There are mono and stereo channels, and the sampling frequencies are generally 1125Hz(11kHz), 225Hz(22kHz) and 441Hz(44kHz). Capacity of WAVE file = (sampling frequency × sampling number × channel) × time /8(1 byte =8bit). The traditional MOD MOD is a music format similar to a wave table, but its structure is similar to MIDI, which uses real sampling and is very small. In the previous DOS era, MOD was often used as the background music of games. The current MOD can contain many audio tracks with many formats, such as S3M, NST, 669, MTM, XM, IT, XT and RT, etc. Computer music MIDI MIDI is the abbreviation of Musical Instrument Data Interface. It records the sounds played by musical instruments in a digital way (each note is recorded as a number), and then synthesizes these records through FM or wave table when playing: FM synthesis simulates the sounds of musical instruments by mixing sounds of multiple frequencies; Wave table synthesis is to store the sound samples of musical instruments in the sound card waveform table, and take them out from the waveform table to produce sound when playing. The leader MP3 MP3 is famous. It uses MPEG Audio Layer 3 technology to compress sound with a compression ratio of 1: 1 or even 1: 12, with a sampling rate of 44kHz and a bit rate of 112 kbit/s.. MP3 music is stored digitally. If you want to play it, you must have a corresponding digital decoding and playing system. Generally, MP3 digital music is decoded by special software, and then it is restored to a waveform sound signal for playing and outputting. This software is called MP3 player, such as Winamp. Internet overlord RA series RA, RAM and RM are all mature network audio formats of Real Company, which adopt "audio streaming" technology, so they are very suitable for network broadcasting. Information such as copyright, singer, producer, Mail and the Title of the song can be added when making. RA can be called the overlord of multimedia communication on the Internet, which is suitable for real-time playing on the Internet and is the best format for listening to online music at present. VQF VQF with high compression ratio, TwinVQ, is an audio compression technology developed by Nippon Telegraph and Telephone and YAMAHA Company. The audio compression rate of VQF is nearly twice as high as the standard MPEG audio compression rate, which can reach about 1∶18 or even higher. However, popular compression formats such as MP3 and RA are generally only about 1∶12. But it still won't affect the sound quality. When VQF compresses music at the audio sampling rate of 44kHz-8kbit/s, its sound quality will be better than that of MP3 at 44kHz-128kbit/s, and when compressed at 44kHz-96kbit/s, the music will be close to that of MP3 at 44 kHz-256 kbit/s.. Mini MD MD (MiniDisc) is a complete portable music format introduced by SONY in 1992, and its compression algorithm is ATRAC technology (compression ratio is 1∶5). MD is divided into MD(Recordable MD (with magnetic head and laser head) and pre-recorded MD (with laser head only). Powerful editing function is the strength of MD, which can quickly select songs, move tracks, merge, split, delete and edit titles. It is more personalized than CD, and you can have your own MD album at any time. MD products include MD walkman, MD bedside stereo, MD car stereo, MD recording deck, MD camera gun and MD driver. A music CD is a CD record. A CD can play a sound file for about 74 minutes. The Windows system comes with a CD player. In addition, the software attached to most sound cards provides the CD playing function. Some optical drives even can be used as an independent CD player as long as they are connected to the power supply. WMA Microsoft, which has unlimited potential, mainly promotes ASF(Audio Steaming format) in developing its own network multimedia service platform, which is a standard that openly supports data transmission on various networks and protocols. It supports audio, video and a series of other multimedia types. WMA is the abbreviation of Windows Media Audio, which is equivalent to ASF file containing only audio. The compression ratio of WMA file can reach 1∶18 in the mode of 8kbps and 44kHz, which is basically the same as VQF. And the compression speed is twice as high as that of MP3. So it should be more competitive than VQF. Free music format Vorbis In order to prevent the patent fees charged by MP3 music companies from rising, programmers of iCast company of GMGI developed a new free music format Vorbis, whose sound quality can be comparable to or even better than MP3. And it will be released through the network, which can be downloaded for free, without worrying about infringement. However, MP3 has become very popular on the Internet, and Microsoft's Windows Media technology has also become popular, so the prospect of Vorbis is still not optimistic. Other audio formats AIF/AIFF: A sound file format developed by Apple, which supports MAC platform and 16-bit 44.1kHz stereo. AU: SUN's Au compressed sound file format only supports 8-bit sound, and is a common sound file format on the Internet, which is mostly created by Sun workstations. Cda: CD audio track file. CMF: A MIDI-like sound file developed by Creative Company. DSP: short for digital signal processing. By improving the signal processing method, the sound quality will be greatly improved and the songs will be more pleasant to listen to. S3U：MP3 playlist RMI：MIDI musical instrument sequence lossy compression: AAC: The sound quality is second only to MPC at high bit rate, and the appearance is very good at both high bit rate and low bit rate. The coding speed is too slow! MPC: The performance is average at low bit rate, which is not as good as MP3 and OGG encoded by Mp3Pro. At high bit rate, the sound quality is the best and the encoding speed is fast! OGG: The sound quality is the best at low bit rate, and the high bit rate is also good. The coding speed is a little slow. MP3(MP3Pro): the sound quality is inferior to OGG at low bit rate, and it is the same as MP3 WMA in other aspects: it is not supported at high and low bit rates, and lossless compression of up to 192Kbit/s: FLAC: the compression rate is the worst among the four, the coding speed is good, and the platform support is good. PAC: slightly slower coding speed, third compression rate and good platform support. APE: the fastest coding speed and the best compression rate, and the platform support is average. WV: The coding speed is very fast, and the compression rate ranks second among the four kinds, only supporting the Windows platform

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