Bit distribution method and apparatus with progressively fine spacing parameter
A technology of bit allocation and spatial parameters, applied in voice analysis, instruments, etc., can solve problems such as frequency characteristics, constraints, and spatial parameter coding redundancy that do not consider spatial parameters
Inactive Publication Date: 2009-08-05
WUHAN UNIV
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Problems solved by technology
Due to the frequency masking effect of the human ear and the frequency dependence of the spatial parameters, the bit allocation method used in the current spatial audio coding system does not consider the frequency characteristics of the spatial parameters to finely quantize the spatial parameters, and there is a redundant coding of the spatial parameters. In addition, it restricts the application of stereo or multi-channel audio coding under limited bit rate
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[0104]The present invention mainly adopts inter-frame, intra-frame and intra-band fine-grained allocation methods for spatial parameters, and allocates more bits to the most sensitive part of human ear perception, and allocates less bits to the insensitive part of human ear perception part, so as to effectively improve the coding efficiency under the premise of ensuring transparent sound quality. attached figure 2 Shown is a schematic diagram of the relationship between the frame, each frequency band in the frame, and each spatial parameter in the frequency band. It can be seen from the figure that the input signal is divided into n frames, each frame includes m frequency bands, and each frequency band includes spectral lines ILD, ICD, IC, etc. of spatial parameters. The three are a step-by-step relationship.
[0105] The bit allocation method provided by the present invention can be realized by using computer software technology, and can also be realized by using the modul...
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Spatial parameter is spatial information used for expressing the effect that human ears perceive a sound field. The bit allocation of the spatial parameter is one of core technologies of spatial audio coding. The invention discloses a bit allocation method with the spatial parameter fined step by step and the method includes the steps of: first carrying out frame-dividing processing to an input signal; allocating frequency band of each frame signal according to bark band rule after time-frequency transform and selecting bit allocation mode; and then carrying out bit allocation to all parameters of inter-frame, intra-frame and intra-frequency band according to the selected allocation mode, realizing the bit allocation with the spatial parameter fined step by step and designing an application device based on this. The method gives more bit allocation to a human ear part which perceives the most amount of information most sensitively and less bit allocation to a human ear part which perceives insensitively, thus achieving the purpose of effectively improving coding efficiency on condition of ensuring transparent timbre.
Description
technical field [0001] The present invention relates to a bit allocation method and its device for stepwise fine spatial parameters, and more particularly, to a stepwise fine bit allocation method for spatial parameters in a spatial audio coding system and its device. Background technique [0002] Spatial audio coding technology is an efficient coding method developed for the number of channels in traditional audio coding that increases linearly with the bit rate. Encoding rate. Spatial parameters mainly describe the orientation information and sound image width of the signal. The results of psychoacoustic research show that the most important basis for sound source localization is the difference between the sound signals between the two ears, usually using two parameters, Interaural Time Difference (ITD) and Interaural Level Difference (Interaural Level Difference, ILD). Describes the difference between the sound signals between the two ears; another description of the ch...
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Inventor 胡瑞敏陈水仙陈冰王恒陈文琴曹晟陈琪张磊
Owner WUHAN UNIV