1. MP3

MP3 is an audio compression technology, its full name is Moving Picture Experts Group Audio Layer III (Moving Picture Experts Group Audio Layer III), referred to as MP3. It is designed to significantly reduce the amount of audio data. Using MPEG Audio Layer 3 technology, music is compressed into smaller files at a compression rate of 1:10 or even 1:12;

For most users, the playback sound quality is the same as the original There is no noticeable drop compared to uncompressed audio. It was invented and standardized in 1991 by a team of engineers at the Fraunhofer-Gesellschaft, a research organization based in Erlangen, Germany. Music stored in MP3 format is called MP3 music, and a machine that can play MP3 music is called an MP3 player.

2. ape

APE is one of the popular digital music lossless compression formats. Because it appeared earlier, it has a wide user base around the world, especially in mainland China. Unlike lossy compression formats such as MP3, which irreversibly delete data (insensitive to human hearing) to reduce the size of the source file, lossless compression formats such as APE use a more refined recording method to reduce the size. After restoration, the data is The source file is the same, thus ensuring the integrity of the file.

APE is suppressed by the software Monkey's audio. The developer is Matthew T. Ashland. The source code is open. It is famous for its "monkey" logo on the interface. Compared with FLAC, a similar file format, ape has error checking capabilities but does not provide error correction functions to ensure that the files are lossless and pure. Another feature of ape is that the compression rate is about 55, which is higher than FLAC, and the volume is about half of the original CD. Easy to store.

3. FLAC

FLAC in Chinese can be interpreted as lossless audio compression coding. FLAC is a well-known set of free audio compression codes, which is characterized by lossless compression. Unlike other lossy compression codes such as MP3 and AAC, it does not destroy any original audio information, so it can restore the sound quality of music discs. Since 2012, it has been supported by many software and hardware audio products (such as CDs, etc.).

FLAC is different from MP3. MP3 is a lossy audio compression encoding, but FLAC is lossless compression, which means that the audio will not lose any information after being compressed with FLAC encoding. After restoring the FLAC file to a WAV file, The same content as the WAV file before compression.

Extended information:

FLAC characteristics——

1. Fast:

FLAC pays more attention to the speed of decoding. Decoding only requires integer operations and has very low computational speed requirements compared to most encoding methods. Real-time decoding can be easily achieved on very common hardware.

2. Hardware support:

Because FLAC provides free decoding examples and has low decoding complexity, FLAC was the only one that received extensive and good hardware support until 2012. Lossless compression encoding.

3. Can be used for streaming media:

Each data frame of FLAC contains all the information required for decoding. The current frame is decoded without reference to the data frames preceding or following it. FLAC uses synchronization codes and CRCs (similar to encoding formats such as MPEG) so that the decoder can have minimal time delays when positioning jumps in the data stream.

Baidu Encyclopedia-MP3

Baidu Encyclopedia-APE

Baidu Encyclopedia-FLAC