What are the formats of audio? Which recording quality is better? Which one is more common?

People who often play music should often hear the word MIDI (Musical Instrument Digital Interface), which allows digital synthesizers to exchange data with other devices. The MID file format is inherited from MIDI. MID file is not recorded sound, but a set of instructions that record sound information and then tell the sound card how to reproduce music. This MIDI file only needs about 5 ~ 1 0kb of music per minute. Nowadays, MID files are mainly used for original musical instruments, amateur performances of pop songs, game tracks and e-cards. *. * effect. Mid file playback depends entirely on the grade of sound card. * the biggest use. Mid format belongs to the field of computer typesetting. *.MID files can be written in composition software, or the music played by an external sequencer can be input into the computer through the MIDI port of the sound card to make *. Intermediate file.

MP3 file

The full name of MP3 is Audio Layer III of Moving Picture Experts Group. 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, and compresses music into files with smaller capacity with the compression ratio of 1: 12 or even1:12. In other words, it can compress files to a smaller extent without losing sound quality. But also the original sound quality is well maintained. Because of its small size and high sound quality, MP3 format has almost become synonymous with online music. The MP3 format of music per minute is only about 1MB, so the size of each song is only 3-4MB. Use MP3 player to decompress (decode) MP3 files in real time, thus playing high-quality MP3 music.

WMA: the most powerful enemy

WMA (Windows MediaAudio) format is a heavyweight player from Microsoft. Its background is tough, and its sound quality is better than MP3 format and far better than RA format. Like the VQF format developed by Yamaha Company in Japan, it aims to achieve a higher compression ratio than MP3 by reducing data traffic but maintaining sound quality. The compression ratio of WMA can generally reach about 1: 18. Another advantage of WMA is that content providers can add copyright protection through DRM (Digital Center Management) schemes such as Windows Media centersManager7. This built-in copyright protection technology can limit the playing time and times, even the playing machine. This is good news for music companies that have been overwhelmed by piracy. In addition, WMA also supports audio streaming technology, which is suitable for play online on the Internet. As the pioneer of Microsoft's online music, it can be said that it is advanced in technology and powerful, and it is not more convenient to install a player like MP3. The seamless combination of windows operating system and WindowsMediaPlayer allows you to play WMA music directly as long as you install Windows operating system. The new version of WindowsMediaPlayer7.0 adds the function of directly converting CD into WMA sound format. In the newly produced operating system WindowsXP, WMA is the default encoding format. Everyone knows what happened to Netscape, and now the "wolf" is coming again. WMA is a format that can adjust the sound quality during recording. The same format, good sound quality can be comparable to CD, high compression rate can be used for network playback. Although it is not very popular on the Internet now, with the large-scale promotion of Microsoft, it has been recognized and strongly supported by more and more websites. In the field of online music, it is almost equal to * * .mp3, and it is also carving up the world laid by Real in terms of online playing. Therefore, almost all audio formats feel the pressure of WMA format.

The melody of real audio flow

RealAudio is mainly suitable for online music appreciation on the Internet. At present, most users are still using Modem with a speed of 56Kbps or lower, so typical playback is not the best sound quality. Some download websites will prompt you to choose the best real file according to your modem speed. At present, real has several file formats: RA(RealAudio), RM(RealMedia, RealAudioG2), RMX(RealAudioSecured), and so on. The characteristics of these formats are that they can change the sound quality with the different network bandwidth, and on the premise of ensuring that most people can hear smooth sound, the audience with richer bandwidth can get better sound quality.

Recently, with the general improvement of network bandwidth, Real Company is launching a format for network broadcasting, which can reach the sound quality of CD. If your RealPlayer software can't handle this format, it will remind you to download a free upgrade package. For example, many music websites provide audition versions of songs in real format. Now the latest version is RealPlayer9.0, and the 39th issue of Computer News also introduced RealPlayer9.0 in detail, so I won't go into details here.

VQF: doomsday yellow flower

Another format of Yamaha Company is *. Vqf, its core is to reduce data traffic while maintaining sound quality, in order to achieve a higher compression ratio. It can be said that the technology is also very advanced, but due to poor publicity, this format is difficult to use. *.vqf can be played with Yamaha's player. At the same time, Yamaha also provides software for converting from *. Wav file to *. Vqf file.

Common formats are WMA, MP3 and MIDI.

MIDI is the smallest, WMA is relatively small, and MP3 is the largest (but the sound quality is the best).

WAV format is a sound file format developed by Microsoft, also known as waveform sound file. It is the earliest digital audio format and is widely supported by Windows platform and its applications. WAV format supports a variety of compression algorithms and a variety of audio bits, sampling frequencies and channels. It uses the sampling frequency of 44. 1kHz and the quantization bit of 16, so the sound quality of WAV is almost the same as that of CD. However, WAV format requires too much storage space for communication and propagation.

laser record

*.cda format, that is, CD audio track. The standard CD format is 44. 1K sampling frequency, 88K/ s rate and 16 quantization bits. Because the CD track can be said to be almost lossless, its sound is basically loyal to the original sound, so if you are an audio enthusiast, CD is your first choice. A CD can be played in a CD player or in a computer through various playing software. The CD audio file is a *. CDA file, which is only an index information, does not really contain sound information, so no matter what the length of CD music is, you should put *. The CDA file seen on the computer is 44 bytes long. You cannot directly copy * in CD format. CDA files are played on the hard disk, but you need to use audio capture software such as EAC to convert CD files into WAV. If the quality of the optical drive is up to standard and the parameters of EAC are set properly, it can be said that the audio capture is basically intact.

OGG

Ogg is an advanced lossy audio compression technology, and its official name is Ogg Vorbis, which is a free and open source audio format. OGG coding format is far more advanced than MP3 successfully developed in 1990s, and it can achieve better sound quality than MP3 at relatively low data rate. In addition, Ogg Vorbis supports VBR (variable bit rate) and ABR (average bit rate) encoding methods, and Ogg also has a bit rate scaling function, which can adjust the bit rate of files without recoding. OGG format can encode all channels and support multi-channel mode, unlike MP3 which can only encode two channels. Multi-channel concerts bring more presence, and enjoying movies and symphonies is more advantageous. This revolutionary change cannot be supported by MP3. Now and in the future, people's requirements for sound quality are constantly improving, and the advantages of Ogg will be more obvious.

2. How to make OGG music format files?

Music files in OGG format are not widely used now. Generally, we need to use CD records or other formats downloaded from the Internet for conversion. Firstly, introduce some knowledge of Ogg coding. There are three bit rate options in Ogg coding: ABR, VBR and quality. In fact, the bit rate of Ogg is variable. It is suggested to use simple quality mode, which can meet the requirements of most people.

MP3 format

What is MP3 format, what file is MP3 format, and how to save it as MP3? My mobile phone, MP3 player, MP3 music CD and so on all store music files in MP3 format. Compared with WAV files, MP3 format is very small. Basically, the file playback time is around 1M, and the sound quality is good. (Mega (m): the data storage unit in the computer is1m =1m =1024 KB). You must want to know what mp3 format is. Continue reading:

Simply put, MP3 (Moving Picture Experts Group Audio Layer III) is an audio compression technology. Because the full name of this compression method is MPEG Audio Layer3, people call it mp3 for short, and its file extension is .mp3 (and .mp2, which readers can understand). MP3 uses the technology of MPEG Audio Layer 3, and compresses music into files with smaller capacity with the compression ratio of 1: 12 or even1:12.

MP3 features: MP3 can ensure that files are compressed to the lowest degree with little loss of sound quality, and the original sound quality is well maintained. Because of its small size and high sound quality, MP3 format has almost become synonymous with online music. The MP3 format of music per minute is only about 1MB, so the size of each song is only about 3 to 5 meters.

RA is a streaming media audio format with poor quality, so MP3 is not recommended. Ogg Vorbis, AAC and WMA are all audio formats with high compression rate and high quality. Unless your MP3 player doesn't support them (Ogg Vorbis and AAC only support some MP3 players, and WMA supports almost all MP3 players), you don't need to convert to MP3.

APE and FLAC are lossless compression formats with excellent sound quality. FLAC can support some MP3 players, but its size is relatively large, so it must be compressed before it can be put into MP3 players. They are excellent raw materials for making MP3 music (as are WAV).

AAC stands for Advanced Audio Coding. It is an audio compression algorithm with high compression ratio, far exceeding the older audio compression algorithms such as MP3 (up to 20∶ 1). At present, Apple's iPod and other high-end MP3 walkman already support AAC audio format, and AAC audio uses AAC or MP4 as the file extension.