Digital audio coarse layering coding method and digital audio coarse layering coding device
A digital audio and layered coding technology, applied in the field of audio coding and decoding, can solve the problems of complex structure, low coding efficiency, high processing logic complexity, etc., and achieve the effect of simple implementation and avoiding the decline of coding efficiency
Active Publication Date: 2015-03-25
广东广晟研究开发院有限公司
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[0011] The technical problem to be solved by the present invention is to provide a digital audio coarse layered coding method and device in view of the disadvantages of low coding efficiency, complex structure, and high processing logic complexity in the above-mentioned fine layered method of the prior art
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[0092] 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.
[0093] figure 1 A flow chart of a digital audio coarse layered coding method 100 according to an embodiment of the present invention is shown. Such as figure 1 As shown, the digital audio coarse layered coding method 100 includes the following steps:
[0094] In step 110, the digital audio signal is divided into a base layer and at least one enhancement layer;
[0095] In step 120, encode the one base layer and the at least one enhancement layer respectively.
[0096] Specific as figure 2 As shown, the digital audio signal is divided into a base layer and at least one enhancement layer in the...
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The invention relates to a digital audio coarse layering coding method and a digital audio coarse layering coding device. The digital audio coarse layering coding method comprises S1, dividing a digital audio signal into a base layer and at least one enhancement layer; and S2, respectively carrying out coding on the base layer and the at least one enhancement layer. The S1 further comprises S11, dividing a single track audio signal into a base layer and at least one enhancement layer based on a frequency band or a residual error layered structure; S12, dividing a stereo audio signal into a base layer and at least one enhancement layer based on a frequency band, tracks, parameter stereo codes or a residual error layered structure; and S13, dividing a multi-track audio signal into a base layer and at least one enhancement layer based on a frequency band, tracks or the residual error layered structure. The digital audio coarse layering coding method and the digital audio coarse layering coding device prevents code efficiency from reduction caused by fine layering, is simple in achievement, can obtain optimal comprehensive sound quality, easily satisfies channel coding requirements, is free from various limiting conditions needed by the fine layering, and ensures compression with higher efficiency.
Description
technical field [0001] The present invention relates to audio codec technology, more specifically, to a digital audio coarse layered coding method and device. Background technique [0002] In layered audio coding, there are already lossy digital audio coding technologies and lossless audio coding technologies in a fine layered manner. For example, ISO / IEC 14496-3MPEG-4BSAC (Bit sliced arithmetic coding) bit slice arithmetic coding proposes fine layering technology. In this coding algorithm, the transform domain coefficients (spectral coefficients) based on MDCT (Modified Discrete Cosine Transform) transformation are quantized into integers, and are divided into multiple groups from low frequency to high frequency, and each group The spectral coefficients form bit slices from high bits to low bits for arithmetic coding, so very fine layered (or scalable) coding can be realized. However, for fine layering, it is necessary to consider limiting the length of spectrum partiti...
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IPC IPC(8): G10L19/20G10L19/008
Inventor闫建新王磊
Owner广东广晟研究开发院有限公司