what is mp3

mp3 can refer to an MP3 player or an audio encoding method. An MP3 player is a player that can play music files. It is mainly composed of a memory (memory card), a display (LCD display), a central processing unit MCU (microcontroller) or a decoding DSP (digital signal processor). The full name of MP3 compression technology is Motion Picture Expert Compression Standard Audio Level 3, which is designed to significantly reduce the amount of audio data. Music stored in MP3 format is called MP3 music, and a machine that can play MP3 music is called an MP3 player.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

MP3 has two common meanings, let’s learn about it below.

mp3 (a player that can play music files)

MP3 is a player that can play music files, mainly composed of memory ( Memory card), display (LCD display), central processing unit MCU (microcontroller) or decoding DSP (digital signal processor), etc.

Saehan launched the world's first MP3 player - MPMan F10 in 1998.

MP3 player is actually a small computer with specific functions. In the small body of the MP3 player, there are MP3 player memory (memory card), MP3 player display (LCD display), MP3 player central processing unit MCU (microcontroller) or MP3 player decoding DSP ( digital signal processor) etc. The microprocessor is the "brain" of the player. It is used to receive the playback control selected by the user, display the currently playing song information on the LCD screen, and then issue instructions to the data signal processing chip to accurately process the audio signal. . The digital signal processor first uses a decompression algorithm to decompress the MP3 file, then uses a digital-to-analog converter to convert the digital information into waveform information, and then the amplifier amplifies the signal and sends it to the audio port. Finally, we can use the headphones connected to the audio port Hear beautiful music. At the same time, we can use its built-in data cable (USB) to connect to the computer and import our favorite audio files into MP3 through the network. Not only can we listen to music, but we can also perform necessary English listening training. In short, it is the crystallization of the wisdom of this information-based world.

mp3 (an audio encoding method)

MP3 is an audio compression technology, its full name is the moving image expert compression standard audio layer 3 (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 with a compression rate of 1:10 or even 1:12. For most users, the playback sound quality is no better than the original uncompressed audio. A significant decline. 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.

1. MP3 is a data compression format;

2. It discards data in pulse code modulation (PCM) audio data that is not important to human hearing (similar to JPEG, which is a lossy Image compression), thereby achieving a much smaller file size;

3. MP3 audio can be compressed at different bit rates, providing a range of trade-offs between data size and sound quality. MP3 The format uses a hybrid conversion mechanism to convert time domain signals into frequency domain signals;

4, 32-band polyphase integral filter (PQF);

5, 36 or 12 tap improved discrete Cosine filter (MDCT); each sub-band size can be selected independently between 0...1 and 2...31;

6. MP3 not only has a wide range of client software support, but also many Hardware support such as portable media players (referring to MP3 players) DVD and CD players

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