Shulou(Shulou.com)06/03 Report--

In this issue, the editor will bring you about the common audio formats. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

The audio format is the music format. Audio format refers to the process of digital and analog conversion of audio files, which means to play or process audio files in the computer. The maximum bandwidth of the audio format is 20KHZ, and the rate is between 40~50KHZ. PCM is modulated by linear pulse code, and each quantization step has the same length.

Some common audio formats:

1. CD standard CD format is the sampling frequency of 44.1K, 1411K/ seconds, 16-bit quantized digits, because the CD track can be said to be nearly lossless, so its sound is basically loyal to the original sound.

2. WAVE is a sound file format developed by Microsoft, which is used to save audio information resources on WINDOWS platform and is supported by WINDOWS platform and its applications.

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

4. MPEG is the abbreviation of moving Picture expert Group. At present, MP3 is the most common music format on INTERNET. Although it is a kind of lossy compression, its biggest advantage is that it has a high compression ratio with minimal sound distortion.

5. The compression of MP3 MPEG audio file is a kind of lossy compression. MPEG3 audio coding has a high compression rate of 10 mp3 1, while basically keeping the low audio part undistorted, but sacrificing the quality of the 12KHz to 16KHz high audio part of the sound file in exchange for the file size. Music files of the same length are stored in *. Mp3 format, generally only 1x10 of * .audio files. Therefore, the sound quality is inferior to the sound file in CD format or WAV format.

6. MPEG-4 adopts object-based compression coding technology. Before coding, the video sequence is analyzed, each video object is segmented from the original image, and then the shape information, motion information and texture information of each video object are encoded separately, and the time redundancy between consecutive frames is removed by better motion prediction and motion compensation than MPEG-2. Its core is content-based scale variability (Content-basedscalability), which can assign priority to each object in the image, represent the more important objects with high spatial and temporal resolution, and the less important objects (such as the background of the monitoring system) with lower resolution, or even not display. Therefore, it has the ability of adaptive allocation of resources, and can achieve high-quality and low-speed image communication and video transmission. The utility model has the advantages of less resources, strong flexibility, good network performance and a wider range of application.

7. The MIDI (Musical Instrument Digital Interface) format is used by frequent music players, and MIDI allows digital synthesizers to exchange data with other devices.

8. WMA (Windows Media Audio) format is a heavyweight player from Microsoft. Its background is tough, and its sound quality is stronger than that of MP3 format and much better than RA format. Like VQF format developed by YAMAHA Company of Japan, it achieves a higher compression ratio than MP3 by reducing data flow but maintaining sound quality. The compression ratio of WMA can generally reach around 1:18. Another advantage of WMA is that content providers can add anti-copy protection through DRM (Digital Rights Management) schemes such as Windows Media Rights Manager 7.

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

10. VQF Yamaha another format is * .vqf, whose core is to reduce data traffic but maintain sound quality to achieve a higher compression ratio. VQF audio compression ratio is nearly double that of the standard MPEG audio compression ratio, and can reach around 18:1 or even higher.

11. OggVorbis is a new audio compression format, which is similar to existing music formats such as MP3. But the difference is that it is completely free, open and without patent restrictions.

12. AMR AMR, the full name of Adaptive Multi-Rate, adaptive multi-rate coding, is mainly used for audio of mobile devices, the compression ratio is relatively large, but the quality of other compression formats is relatively poor, because it is mostly used for human voice and phone calls.

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

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

15. AAC AAC is actually an acronym for advanced audio coding. It also supports up to 48 tracks, 15 low-frequency tracks, more sampling and bit rates, compatibility in multiple languages, and higher decoding efficiency.

These are the common audio formats that the editor has shared for you. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.