What are the common audio formats

Audio format is music format. Audio format refers to the process of playing or processing audio files in a computer, which is the process of digital-to-analog conversion of sound files. The maximum bandwidth of the audio format is 20KHZ, the rate is between 40~50KHZ, linear pulse code modulation PCM is used, and each quantization step has an equal length.

Some common audio formats:

1. CD The standard CD format is a sampling frequency of 44.1K, a rate of 1411K/second, and 16 quantization bits, because the CD audio track can be said to be It is nearly lossless, so its sound is basically faithful to the original sound.

2. WAVE is a sound file format developed by Microsoft. It is used to save audio information resources of the WINDOWS platform and is supported by the WINDOWS platform and its applications.

3. AIFF (Audio Interchange File Format) format and AU format. AIFF is the English abbreviation of Audio Interchange File Format. It is an audio file format developed by APPLE and is supported by the MACINTOSH platform and its applications. Many compression technologies are supported.

4. MPEG is the English abbreviation of the Moving Picture Experts Group. Currently, MP3 is the most common music format on the INTERNET. Although it is a type of lossy compression, its biggest advantage is that it exchanges minimal sound distortion for a higher compression ratio.

5. MP3 The compression of MPEG audio files is a kind of lossy compression. MPEG3 audio encoding has a high compression ratio of 10:1~12:1, while basically keeping the low audio part without distortion, but sacrificing the sound. The quality of the 12KHz to 16KHz high audio part in the file is exchanged for the file size. Music files of the same length, stored in *.mp3 format, are generally only 1/10 of *.wav files, so the sound quality is inferior to CD format or Sound files in WAV format.

6. MPEG-4 uses object-based compression coding technology. Before encoding, the video sequence is first analyzed, each video object is segmented from the original image, and then each video object is processed separately. Shape information, motion information, and texture information are encoded separately, and temporal redundancy between consecutive frames is removed through better motion prediction and motion compensation than MPEG-2. Its core is content-based scalability, which can assign priorities to each object in the image. More important objects can be represented with high spatial and temporal resolution, and less important objects (such as monitoring systems) can be represented with high spatial and temporal resolution. background) is represented at a lower resolution or not even displayed. Therefore, it has the ability to adaptively allocate resources and can achieve high-quality and low-rate image communication and video transmission. It takes up less resources, has strong flexibility, has good network performance, and has a wider scope of application.

7. The MIDI (Musical Instrument Digital Interface) format is used by people who often play music. MIDI allows digital synthesizers and other devices to exchange data.

8. The WMA (Windows Media Audio) format is a heavyweight player from Microsoft. It has a tough background and its sound quality is better than the MP3 format and far better than the RA format. It is the same as the VQF format developed by Japan's YAMAHA company. , which achieves a higher compression rate than MP3 by reducing data traffic but maintaining sound quality. The compression rate of WMA can generally reach about 1:18. Another advantage of WMA is that content providers can pass DRM (Digital Rights) Management) solutions such as Windows Media Rights Manager 7 add anti-copy protection.

9. RealAudio has RA (RealAudio), RM (RealMedia, RealAudio G2), RMX (RealAudio Secured)

10. VQF Yamaha Another format is *.vqf, its The core is to achieve a higher compression ratio by reducing data traffic but maintaining sound quality. VQF's audio compression rate is nearly twice as high as the standard MPEG audio compression rate, and can reach around 18:1 or even higher.

11. OggVorbis is a new audio compression format, similar to existing music formats such as MP3. But one thing is different: it is completely free, open and patent-free.

12. AMR AMR stands for Adaptive Multi-Rate, adaptive multi-rate coding, mainly used for audio on mobile devices. The compression ratio is relatively large, but the quality is relatively poor compared to other compression formats, because it is mostly used for human voices. ,call.

13. APE APE is one of the currently popular digital music file formats. APE is a lossless compression audio technology.

14. FLAC LAC is similar to MP3, both are audio compression encodings, but FLAC is lossless compression.

15. AAC AAC is actually the abbreviation of Advanced Audio Coding. It also supports up to 48 audio tracks, 15 low-frequency audio tracks, more sample rates and bit rates, and multiple language compatibility. capabilities and higher decoding efficiency.

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