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Multi-channel digital audio coding method based on DRA coder and coding system thereof

A coding method and digital audio technology, applied in stereo systems, instruments, speech analysis, etc., can solve problems such as distortion and subjective sound quality degradation, and achieve the effect of ensuring backward and forward compatibility

Inactive Publication Date: 2010-08-11
数维科技(北京)有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the subjective sound quality has obvious decline and distortion under the low bit rate (high compression) of the high-quality audio coding algorithm DRA

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  • Multi-channel digital audio coding method based on DRA coder and coding system thereof
  • Multi-channel digital audio coding method based on DRA coder and coding system thereof
  • Multi-channel digital audio coding method based on DRA coder and coding system thereof

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Embodiment Construction

[0016] The preferred embodiments of the present invention will be described below with the aid of the drawings. In the following description, the functions or structures that have become the prior art will not be described in detail, because unnecessary details will cause the introduction of the present invention to be ambiguous.

[0017] in Figure 1A A typical DRA audio encoder is shown in, which can be implemented by hardware, software, and / or firmware. In short, the technology involved in the DRA standard is to use multiple technology modules to process the source sound (for example, input PCM samples) to achieve the goal of almost lossless compression of the source sound. The above-mentioned multiple technical modules include, but are not limited to: transient analysis module 120, multi-resolution filter bank module 122, linear scalar quantization module 130, quantization index encoding module 132, codebook selection module 134, human hearing model module 140, The global bi...

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Abstract

The invention relates to a multi-channel digital audio coding method based on a DRA coder, which is characterized by comprising the following steps of: firstly downmixing a plurality of channels into less channels by using a parameter multi-channel coding method; processing a low frequency part of the channels subjected to the downmixing by using the DRA coder; and carrying out bandwidth expansion processing on a high frequency part of the channels subjected to the downmixing.

Description

Technical field [0001] The present invention relates to a digital audio coding method and a coding system thereof under a low bit rate condition, and more specifically, to a low bit rate digital audio coding method and a coding system thereof based on DRA audio coding and decoding technology. Background technique [0002] Such as Figure 1A-1B As shown, the DRA audio coding and decoding technology, which is the standard of China's audio coding electronics industry, has been well-known in the industry in recent years. For more detailed content of the DRA (Digital Rise Audio) audio codec technology, please refer to the industry standard of the standard serial number SJ / T 11368-2006 issued by the Ministry of Information Industry on January 4, 2007. The entire content of the standard is hereby quoted. The way is incorporated into this article. In addition, for the convenience of description, hereinafter this standard is referred to as "DRA standard", and the DRA audio codec technolog...

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Application Information

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IPC IPC(8): G10L19/00H04S3/00G10L19/008
Inventor 闫建新
Owner 数维科技(北京)有限公司
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