Coding method and system for dual-core coding mode
A technology of dual-core coding and coding method, which is applied in audio and speech signal coding method and the system field applying the method, can solve problems such as no available bits, inability to fully consider the global subjective quality, and unstable coding quality, so as to improve the coding quality Effect
Active Publication Date: 2014-08-06
广东广晟研究开发院有限公司
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[0026] The technical problem to be solved by the present invention is that the ABR of the FD branch in the prior art does not perform bit pool control, and it is possible that the number of bits in the bit pool of some signals will be used up quickly. There are no bits available, resulting in unsteady coding quality, and the LPC branch simply uses CBR coding, which cannot fully consider the global subjective quality and other issues. The present invention provides the following technical solutions
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[0038] figure 2 A block diagram of an encoding system 200 for dual-core encoding mode implementing bit control according to an exemplary embodiment of the present invention is shown. and figure 1 Compared with the dual-core encoding mode encoder 100, the present invention adds a first bit control module 209 and / or a linear prediction domain encoding module 206 (corresponding to the linear A second bit control module 210 is added before the prediction domain coding module 106 ). In this embodiment, the first bit control module 209 is an ABR bit control module 209 , and the second bit control module 210 is a pABR bit control module 210 .
[0039] Wherein, the ABR bit control module 209 performs bit control according to bit control parameters such as perceptual entropy and bit pool fullness. The principle of ABR bit control is to use less bits (less than average bits) for easy-to-encode frames, and store the remaining bits in the bit pool; use more bits (more than average bit...
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The invention relates to a coding method and a coding system for a dual-core coding mode. The method comprises of judging an input signal to be a signal similar to music or voice; carrying out surrounded sound encoding on the input signal, and judging the input signal to be a stereo signal or a multi-channel signal; reproducing an enhanced frequency band after the surrounded sound parameter of the input signal is extracted; carrying out first bit control or second bit control on the input signal after reproduction of the enhanced frequency band; carrying out frequency domain coding on the input signal subjected to the first bit control, and carrying out linear forecast domain coding on the input signal subjected to the second bit control; and carrying out quantization coding on the input signal, and finally carrying out multiplex on all obtained coding data and side information through the multiplex. By the adoption of the coding method and the coding system for the dual-core coding mode, the coding quality of mixed signals is improved.
Description
technical field [0001] The present invention relates to an audio and speech signal coding method and a system applying the method, more specifically, to a coding method and system for a dual-core coding mode. Background technique [0002] Currently popular perceptual encoders generally adopt two types of methods in bit rate control. One is an algorithm based on constant bit rate (Constant Bit Rate, CBR), for example, Dolby-AC3, layer 1 and layer 2 in MPEG-1, AMRWB+ of 3GPP, and applied to China Mobile Multimedia Broadcasting (China MobileMultimedia Broadcasting, Digital Rise Audio (DRA) in CMMB) (Chinese National Standard GB / T22726-2008). The advantage of CBR is that the delay is fixed, no overflow and underflow will occur at the decoding end, and the bit control algorithm at the encoding end is simple; the disadvantage is that when the audio signal is a non-stationary signal, the encoding quality may be unstable. The other is an algorithm based on the average bit rate (Av...
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IPC IPC(8): G10L19/24G10L19/02G10L19/04
Inventor 王磊闫建新
Owner 广东广晟研究开发院有限公司