There is mp3 mp4, so is there any mp2 and mp1?

There are mp1 and mp2, but everyone doesn't use it often and is not familiar with it.

Here's an encyclopedia's explanation.

The audio standard defines three different levels of compression, namely MPEG Audio Layer-1, MPEG Audio Layer-2, and MPEG Audio Layer-3, which are abbreviated as MP1, MP2, and *** respectively. The higher the level, the better the compression performance, but the encoding overhead and decoding complexity also increase. The MP2 balances performance and complexity, and it delivers CD-level sound quality at 192 256kbps.

MPEG audio file ——.mp1/.mp2/.***

MPEG is the English abbreviation of Moving Picture Experts Group, which stands for MPEG Moving Picture Compression Standard, and the audio file format here refers to the audio part of the MPEG standard, that is, the MPEG audio layer. The compression of MPEG audio files is a kind of lossy compression, which can be divided into three layers (MPEG audio layer 1 2 3) according to the compression quality and encoding complexity, corresponding to MP1, MP2 and *** sound files. MPEG audio coding has a high compression ratio, MP1 and MP2 compression rates are 4 1 and 6 1 8 1, respectively, and the compression rate is as high as 10 1 12 1, that is to say, a minute of CD sound quality, uncompressed needs 10MB storage space, and after *** compression encoding only about 1MB, while its sound quality basically remains undistorted, therefore, the most used at present is the *** file format.

mp2 With the further improvement of industrial technology, it is imperative for enterprises to establish a systematic and stable maintenance management software. As a fully integrated equipment asset management system solution, MP2 can help enterprises to:

Plan and track inventory.

Manage device costs.

Keep track of device history.

Plan preventative maintenance tasks.

Guarantee the confidentiality of employee files.

Allocate resources wisely.

Generate a work order. Requisition and procurement of spare parts.

Equipment failure.

mp1mpeg audio file – mp1

MP1 (MPEG-1) is used to transmit 1 5Mbps data transmission rate of digital storage ** image and its accompanying sound encoding, after MPEG-1 standard compression, ** data compression ratio of 1 100-1 200, audio compression ratio of 1 provides 30 frames per second 352 * 240 resolution of the image, when using appropriate compression technology, with close to the quality of home ** standard (VHS) video tape. MPEG-1 allows more than 70 minutes of high quality** and audio to be stored on a single CD-ROM disk. VCD uses the MPEG-1 standard, which is a quality-level audio compression standard for home TV.

Fifth, the difference on the **: due to the function, effect and other influences, the MP5 is generally set at more than RMB 200, while the sales of MP4 are basically set at about RMB 100, and the difference is a big improvement in the function of more than 100 pieces. However, it also depends on personal usage habits and ease of carrying.

It's to listen to songs.,MP4 can watch movies.,MP5 has no market norms yet.,It should be based on the function of MP4 to add something like photography!

Categories: Computer Network >> Software >> Multi** Software.

Analysis: *** It is the use of MPEG audio layer 3 technology to use 1:10 or even 1:

12 compression, which makes it a smaller file, but to the human ear, it sounds no different. Of course, this is a kind of distortion compression, just like the graphics file jpg, because of the distortion compression, so you can press a lot, you can also adjust the compression ratio, the more you press, the more distortion.

The compression of MPEG audio files is a kind of lossy compression, which can be divided into three layers (MPEG audio layer 1 2 3) according to the quality of compression and the complexity of encoding, corresponding to MP1, MP2 and *** sound files. MPEG audio coding has a high compression ratio, MP1 and MP2 compression ratios are 4 1 and 6 1 8 1, respectively, and the compression rate of *** is as high as 10 1 12 1, that is to say, a minute of CD sound quality, uncompressed needs 10MB storage space, and after *** compression encoding is only about 1MB, while its sound quality is basically not distorted.

Audio MP4 format: AAC

MP4 was originally an audio format, which didn't have much to do with MPEG-4, just like *** has nothing to do with MPEG-3. is an abbreviation for MPEG-1 Audio Layer 3; And MP4 is MPEG-2 AAC, which is completely an audio compression format, adding new features such as perfect reproduction of stereo sound, multi-** control, noise reduction, and most importantly, MP4 achieves digital copyright protection through special technology, which is incomparable.

Now most of the MP4 on the market tends to be more chaotic **** device,Can**AAC,It can be said that it is rare。 There are even ** who say that MP4 is the abbreviation of MPEG4, which seemed to be a fallacy before, but after the continuous hype of the business, this fallacy has become the truth. Now if you go to the computer city and hear the word mp4, it is definitely the concept of multi-**** device that can **** format, not a walkman that can ** audio mp4 aac.

This strange phenomenon is not for no reason,It has been mentioned above that AAC has a copyright protection function,This is also the reason why many record companies support AAC,To make their own ** device support AAC,You have to support the payment of a certain copyright fee or patent fee,In addition,AAC's ** is also a problem,It's not as open as ***,There are very few on the Internet**,So the current development of audio MP4** device is not mature,In view of the above status quo,The merchants simply "borrow the corpse to return the soul", The mp4 is equivalent to the mpeg-4 abbreviation, which also happens to respond to the law that mp4 is the next generation of the first generation, in addition to supporting the **** function that the *** has, it also has a strong mpeg-4 **** ability, in addition, it happens to be "4" after "3", from this point of view, it is reasonable to equate mpeg-4.

Just take it to listen to songs,The general function is very few,The screen is very small,Only a few color screens*** can watch movies,The picture quality is naturally very poor,But the sound quality at the same price is much better than mp4 mp4 mp4 is mainly used to watch movies,low-end picture quality and sound quality are poor,Generally, only the relatively high-end mp4 picture quality and sound quality are good,Secondly, some high-end mp4 functions will be more,such as dictionary,small games,fm,bluetooth, etc. mp5 only a very good brand will be played mp5,In fact, that's fooling people, Don't think that the screen is bigger,The high point of the supported resolution is high-tech,It's mp5,The so-called mp5** is generally not 400,Now mp5 is not defined mp6 is not defined,Although copycat manufacturers will print mp5,But it is rare to print mp6···

All I know is on the computer"Folder options""View", after removing the tick in front of "Hide the extensions of known file types", you can see almost all the extensions, so mp1, mp2, *** are not distinguished?

The so-called mp1 and mp2 are also mpeg-1 and mpeg-2. It is a dynamic image compression standard developed by the IEEE (Institute of Electrical and Electronics Engineers), and its counterpart is JPEG (static image compression standard).

The compression level can be divided into 1,2,3 layers and three ways, of which the first layer is called mp1, the second layer is called mp2, and the third layer is called *** (the computer does not have this name, here is just a common name to distinguish each other). Of these, only *** is the standard format of ***, and the other two are non-standard formats. In addition, if you use the default compression method of Haojie Jieba to compress the *** file, this file is mp2, which is the *** format of the second layer.

Some people also figuratively say: listening to songs with a gramophone is mp0, listening to songs with a radio is mp1, and listening to songs with a tape recorder is mp2.