Method and device for code rate allocation in digital audio coding

A digital audio and medium bit rate technology, applied in the field of digital audio coding, can solve the problems of less adoption and complex implementation, and achieve the effect of good subjective sound quality

Active Publication Date: 2019-12-13
广州广晟数码技术有限公司
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Problems solved by technology

[0006] The second allocation method is more complicated to implement and less used
[0009] It can be seen that the intensity stereo coding method has the following problem in bit rate allocation: since only one mixed high-frequency detail is transmitted, the high-frequency detail and the high-frequency envelope of each channel are used to restore the high-frequency details of each channel during decoding. high frequency part

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  • Method and device for code rate allocation in digital audio coding
  • Method and device for code rate allocation in digital audio coding
  • Method and device for code rate allocation in digital audio coding

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[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0057] The present invention proposes a method and device for bit rate allocation in digital audio coding, which are mainly applied to the application fields of multi-channel coding such as 3D audio systems of ultra-high-definition televisions. The method and device of code rate allocation in the digital audio coding that the present invention proposes mainly consider following problem: (1) under certain code rate condition, the impact of the low-frequency and high-frequency distortion of each sound channel on total subjective sound quality is different (2) The contribution of each full-band channe...

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Abstract

The invention relates to a bit rate allocation method and a bit rate allocation device in digital audio coding. The bit rate allocation method includes selecting a group of specific adjustment coefficients to subject mask thresholds of low-frequency and high-frequency sub-bands in one sound channel to adaptive adjustment so as to achieve adaptive bit rate allocation in the sound channel. According to the method, adaptive bit rate allocation among sound channels is achieved according to characteristics of every sound channel, and a specific weight coefficient is selected to subject the mask thresholds of the mixed high-frequency signals to adaptive adjustment so as to achieve adaptive bit rate allocation during intensity stereo coding. By the adaptive bit rate allocation method, better subjective sound quality can be obtained.

Description

technical field [0001] The present invention relates to digital audio coding technology, more specifically, to a method and device for code rate allocation in digital audio coding. Background technique [0002] With the development of applications such as ultra-high-definition television, the audio requirements have further increased in order to obtain immersive and immersive listening effects. For this reason, the number of channels of the input audio signal is significantly increased (for example, 5.1.4, 7.1.4, and 22.2, etc.), and there are even multiple independent target audio signals. Under the condition of a given coding total bit rate, how to deal with the bit rate allocation of each channel (including the target signal) and the bit rate allocation in each channel will affect the overall coding quality. [0003] The current multi-channel digital audio coding, such as DRA5.1, AAC5.1, DD(DD+), DTS, etc., all belong to perceptual audio coding technology, and the maskin...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G10L19/008G10L19/24
CPCG10L19/008G10L19/24
Inventor闫建新王磊
Owner广州广晟数码技术有限公司