Three-dimensional audio space parameter quantification method based on perception characteristic

Abstract

At present, three-dimensional audio signals are mostly stored and played locally, coding compression of the audio signals is unavailable, or only each sound track is coded independently, code rate can be increased in a linear mode along with the number of the sound tracks, and data size of a audio file can be very large. Compression ratio can be greatly improved with a parameterization coding method, however, space information code rate can also be increased in a linear mode along with the number of the sound tracks, and distortion of the space direction sense of a three-dimensional audio and obvious reducing of the rebuilding effect of the three-dimensional audio can be caused by parameter quantification errors under the condition that the code rate is limited by a real-time rebroadcast bandwidth and capacity of a storage medium. According to the three-dimensional audio space parameter quantification method based on the perception characteristic, in order to solve the problems in the prior art, an uneven quantization table is generated by obtaining perception threshold values in different directions, and encoding rate of parameters is effectively reduced compared with a traditional even quantification table.

Description

technical field [0001] The invention belongs to the field of audio coding, in particular to the space parameter quantization technology in three-dimensional audio. Background technique [0002] At the end of 2009, the 3D movie "Avatar" topped the box office charts in more than 30 countries around the world. By the beginning of September 2010, the cumulative global box office had exceeded 2.7 billion US dollars. The reason why "Avatar" can achieve such brilliant box office results is that it uses a new three-dimensional special effect production technology to bring shocking effects to people's senses. The gorgeous pictures and realistic sound effects shown in "Avatar" not only shocked the audience, but also made the industry assert that "movies have entered the three-dimensional era". Not only that, it will also give birth to more technologies and standards related to film and television, recording, and playback. At the International Consumer Electronics Show held in Las Ve...

AI Technical Summary

Problems solved by technology

When the bit rate is limited by the bandwidth of the transmission channel and the capacity of the storage medium, it will cause distortion of the sound and image orientation of the three-dimensional audio, making the existing three-dimensional audio system unable to be applied to real-time broadcast and home theater environment, which seriously limits the application of the three-dimensional audio system Application and Development

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