Music formats include: MPEG, MP3, MPEG-4, MIDI, WMA, etc.
1. MPEG
MPEG is the abbreviation of Moving Picture Experts Group. This expert group was founded in 1988 and is responsible for establishing video and audio compression standards for CDs. MPEG audio files refer to the sound part of the MPEG standard, the MPEG audio layer.
MP3 is currently the most common music format on the INTERNET. Although it is a lossy compression, its biggest advantage is that it exchanges minimal sound distortion for a higher compression ratio.
2. MP3
The MP3 format was born in Germany in the 1980s. The so-called MP3 refers to the audio part of the MPEG standard, which is the MPEG audio layer. It is divided into 3 layers according to the difference in compression quality and encoding processing, corresponding to the three types of sound files: *.mp1 / *.mp2/ *.mp3.
3. MPEG-4
The MPEG-4 standard is a video compression standard for multimedia applications announced by the International Moving Picture Experts Group in October 2000.
It uses object-based compression coding technology. Before encoding, it first analyzes the video sequence, segments each video object from the original image, and then analyzes the shape information and motion of each video object separately. Information and texture information are encoded separately, and temporal redundancy between consecutive frames is removed through better motion prediction and motion compensation than MPEG-2.
4. MIDI
The MIDI (Musical Instrument Digital Interface) format is used by people who often play music. MIDI allows digital synthesizers and other devices to exchange data. The MID file format is inherited from MIDI. The MID file is not a piece of recorded sound, but a set of instructions that records the sound information and then tells the sound card how to reproduce the music.
5. WMA
WMA (Windows Media Audio) format is a heavyweight player from Microsoft. It has a strong backend and its sound quality is better than MP3 format and far better than RA format. It is the same as the VQF format developed by Japan's YAMAHA company. It achieves a higher compression rate than MP3 by reducing data traffic but maintaining sound quality. The compression rate of WMA can generally reach about 1:18.
6. CD
The sound quality of CD format is a relatively high audio format. Therefore, when it comes to audio formats, CD is naturally the pioneer. In the "Open File Type" of most playback software, you can see the *.cda format, which is the CD audio track.
The standard CD format is a sampling frequency of 44.1K, a rate of 1411K/second, and 16 quantization bits. Because the CD track can be said to be approximately lossless, its sound is basically loyal to the original sound. , so if you are an audiophile, CD is your first choice. It will make you feel the sound of nature. CDs can be played in CD players or replayed using various playback software on computers.
A CD audio file is a *.cda file. This is just index information and does not actually contain sound information. Therefore, regardless of the length of the CD music, the "*.cda file" seen on the computer ” are both 44 bytes long.
7. RealAudio
RealAudio is mainly suitable for online music appreciation on the Internet. There are several main file formats of real: RA (RealAudio), RM (RealMedia, RealAudio G2), RMX (RealAudio Secured), and more.
The characteristic of these formats is that the sound quality can change with different network bandwidths, so that listeners with richer bandwidth can obtain better sound quality while ensuring that most people can hear smooth sound.
With the general improvement of network bandwidth recently, Real Company is launching a format for network broadcast that achieves CD sound quality. If your RealPlayer software cannot handle this format, it will remind you to download a free upgrade package.
Many music websites provide listening versions of songs in Real format. The latest version now is RealPlayer 9.0.
Baidu Encyclopedia-Music Format