1. The original file is a lossless file, because it is a single, including two files 2.
AAC format:
3. mp3 format:
It can be seen from the three pictures that the AAC file and the The spectrum of APE files is very close, and there is no loss at high frequency 20K, while MP3 files are seriously lost at the high frequency end. Comparing the volume, the AAC file is 8.73M, the MP3 file is 9.05M, and the AAC file is even smaller. This is the truth.
1. The popularity of MP3 is obviously not broadcasting, but the popularity of the windows system. In addition to supporting wma, the windows system has also strongly promoted the development of mp3. When you bought the mp3 player, where did you direct the songs from? Not from windows.
2. What about aac? Strong support for aac, at most can be considered to be Apple, itune basically uses aac, but they also support mp3. And other aac invention team members, including sony, etc. are talking in the market Servings are limited.
3. Compatibility, mp3 caught up with the good times of Internet development and seized the opportunity. Make mp3 basically become standard, want to change it is not a matter of a while. Just imagine, your record company made a song, but you used aac, what if the customer bought it and put it in his broken car and couldn't play it? Are they getting a new car or a song? There are software and hardware replacement times here. If you want to replace all of them with aac, you have to consider the pressure and time for most people to change hardware devices.
4. Codecs, mp3 are basically ready-made, aac codec speed is much slower than mp3, the time-consuming and cpu-consuming on hardware devices are obvious, this data is readily available.
5. Patent fees, the patents of mp3 have basically expired, and the only ones are not very important, while the patent fees of aac are expensive and scary, and there are a lot of rules and regulations. Check some of the data yourself, so I won't say more here, let's talk about revealing business secrets.
6. The most powerful thing about aac is the low bit rate, and the low bit rate means that the hardware devices are relatively poor. In this case, the various consumption of aac can not keep up. However, the advantages of aac at high bit rates are not very obvious, and many people can't even hear or care about the feeling of pulling a large distance.
Generally speaking, mp3 has caught up with the good times, and aac has done much more finely, but it was born a few years later. To replace, the key is to update the hardware device, and the hardware device update is much slower than the software.
Here is for pure audio, if the influence of mp4 and 264 video formats is added, aac must be ahead now.