MP3 is a data compression format, 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) and other components. MP3 uses MPEG Audio Layer3 technology, which is designed to greatly reduce the amount of audio data and can compress files to a smaller extent with little loss of sound quality.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
MP3 is a data compression format. MP3 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 decoding DSP (digital signal processor)), etc.
MP3 uses MPEG Audio Layer 3 technology to compress music into files with a smaller capacity at a compression rate of 1:10 or even 1:12. In other words, it can achieve very little loss of sound quality. Next compress the file to a smaller size. And it also maintains the original sound quality very well. It is precisely because of the small size and high sound quality of MP3 that the MP3 format has become almost synonymous with online music. The MP3 format of music per minute is only about 1MB in size, so each song is only 3-4 megabytes in size. Use an MP3 player to decompress (decode) MP3 files in real time, so that high-quality MP3 music can be played.
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 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.
Features
MP3 takes advantage of the human ear's insensitivity to high-frequency sound signals to convert the time domain waveform signal into a frequency domain signal and divide it into multiple Frequency band, use different compression ratios for different frequency bands, increase the compression ratio for high frequencies (or even ignore the signal), and use a small compression ratio for low-frequency signals to ensure that the signal is not distorted. This is equivalent to discarding the high-frequency sound that is basically inaudible to the human ear, and only retaining the audible low-frequency part, thus compressing the sound with a compression ratio of 1:10 or even 1:12. Since the full name of this compression method is MPEG Audio Player3, people call it MP3 for short.
According to the MPEG specification, AAC (Advanced audio coding) in MPEG-4 will be the next generation of the MP3 format.
The sound quality of MP3 (320Kbps) with the highest parameters is not much different from that of CD, FLAC and APE lossless compression formats. Its advantage is that it takes up less space after compression and is suitable for storage and use on mobile devices.
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 (MP3 players) DVD and CD players.
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