Based on this effect, experts designed a psychological model of the human ear. After this model was imported into mp3 encoding, it led to an earth-shaking revolution in sound quality. The mp3 encoding technology has always been burdened with a reputation for poor sound quality, but this notoriety is now Was gradually washed away. At this time, the VBR technology that has been buried is radiant, and with the use of the mental model, it has a powerful temptation and lethality.
For a long time, many people have a bad impression of MP3, and more people think that the best sound quality of WMA is better than MP3. This statement is incorrect. At medium and high bit rates, properly coded MP3 is much better than WMA, which can be very good. Close to CD sound quality. With the support of not-so-good hardware devices, not many people can distinguish the difference between the two. This is not a myth. Although you used to be able to easily distinguish between MP3 and CD in blind listening, now you can’t guarantee that you can. The resolution is correct. Because MP3 is an excellent codec, it was buried before.
4. OGG encoding
An audio codec called Ogg Vorbis appeared on the Internet, known as the MP3 killer! What is the origin of Ogg Vorbis? OGG is the project name of a huge multimedia development plan, which will involve the development of video and audio coding. The purpose of the entire OGG project plan is to provide anyone with a completely free multimedia coding solution! OGG’s belief is: OPEN! FREE! The term Vorbis is the name of a "playboy" character in Terry Prattchat's fantasy novel "Small Gods". This term became the official name for audio coding in the OGG project. At present, Vorbis has been successfully developed and an encoder has been developed.
Ogg Vorbis is a high-quality audio coding scheme. Official data shows: Ogg Vorbis can achieve better sound quality than MP3 at a relatively low data rate! The encoding of Ogg Vorbis is far more advanced than the MP3 that was successfully developed in the 1990s. She can support multi-channel. What does this mean? This means that Ogg Vorbis can encode all channels with the support of SACD, DTSCD, and DVD AUDIO ripping software (this kind of software does not yet exist), instead of MP3 which can only encode 2 channels. The rise of multi-channel music has brought revolutionary changes to music appreciation, especially when appreciating symphony, it will bring more sense of presence. This revolutionary change cannot be adapted to MP3.
Like MP3, Ogg Vorbis is a flexible and open audio coding that can make obvious adjustments to sound quality and improve new algorithms after the coding scheme has been fixed. Therefore, its sound quality will get better and better. Similar to MP3, Ogg Vorbis is more like an audio coding framework, which can be continuously improved by introducing new technologies. Like MP3, OGG also supports VBR.
5. MPC encoding
MPC is another impressive player. Its popularization process is very low-key, and there is no complicated background story. She has only one purpose, smaller volume and better sound quality! MPC was formerly known as MP+, and it is obvious that you can see who the competitor she is targeting. However, anyone who has used this kind of encoding will be impressed by her outstanding sound quality.
6. mp3PRO encoding
On June 14, 2001, Thomson Multimedia SA and the Fraunhofer Institute released a new music format version named mp3PRO, which is a The improved scheme based on mp3 encoding technology is indeed quite attractive from the official features. According to various data, mp3PRO is not a brand-new format. It is an improvement based on traditional mp3 encoding technology. The biggest technical highlight in itself is SBR (Spectral Band Replication), which is a new format. Audio coding enhancement algorithm. It provides the possibility to improve the performance of audio and speech coding under low bitrate conditions. This method can increase the audio bandwidth or improve the coding efficiency at a specified bit rate. The biggest advantage of SBR is to achieve very efficient encoding at low data rates. Unlike traditional encoding technology, SBR is more like a post-processing technology, so the quality of the decoder algorithm directly affects the sound quality. . The high frequency is actually generated by the decoder (player), and the SBR encoded data is more like a command set for generating high frequency, or called the instructive signal source, which is a bit like idi's working method. We can see that mp3PRO is actually a mixed data stream encoding of mp3 signal stream and SBR signal stream. Relevant information shows that SBR technology can improve the high-frequency sound quality under low data traffic by about 30%. We don’t care how this 30% is obtained, but we can predict in advance that this improvement can make 64kbps mp3 reach 128kbps. The sound quality level of mp3 (note: under the same encoding conditions, the increase in data rate is not proportional to the increase in sound quality, at least in terms of human hearing), which is comparable to the official 64kbps mp3PRO which is comparable to 128kbps mp3 The propaganda is basically consistent.
7. WMA
WMA is the file format encoded by Windows Media Audio, developed by Microsoft. WMA is not aimed at the stand-alone market, but the network! The competitor is the famous Real Networks in the online media market. Microsoft claims that with a bit rate of only 64kbps, WMA can achieve sound quality close to CD. Unlike previous encodings, WMA supports the anti-copy function. It supports adding protection through Windows Media Rights Manager, which can limit the playback time and the number of playbacks and even the playback machine, and so on. WMA supports streaming technology, which means reading and playing at the same time, so WMA can easily realize online broadcasting. Because it is a masterpiece of Microsoft, Microsoft has added support for WMA in Windows. WMA has excellent technical characteristics. Under vigorous promotion, this format is accepted by more and more people.
8. RA
RA is the RealAudio format, which is a format that many networms come into contact with. Most of the online auditions of music websites use RealAudio. This format is completely aimed at the media market on the Internet and supports very rich functions. The biggest flashing point is that this format can control its own bit rate according to the bandwidth of the listener, and improve the sound quality as much as possible on the premise of ensuring smoothness. RA can support a variety of audio coding, including ATRAC3. Like WMA, RA not only supports reading and playback, but also supports the use of special protocols to hide the real network address of the file, so as to realize the enjoyment mode of only playing online without downloading. This is very important for record companies and record sales companies. With the vigorous promotion of all parties, RA and WMA are currently the most frequently used audio media formats for online auditions on the Internet.
9. APE
APE is a lossless compression format provided by Monkey's Audio. Monkey's Audio provides Winamp plug-in support, so this means that the compressed file is no longer a simple compression format, but an audio file format that can be played like MP3. The compression ratio of this format is much lower than other formats, but it can be truly lossless, so it has won the favor of many enthusiast users. Among the many existing lossless compression schemes, APE is a format with outstanding performance, satisfactory compression ratio and fast compression speed, making it the only choice for many friends to privately exchange fever music.v
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