The 22.2 multichannel system and its simplified system with 10-channel and 8-channel have been proposed, which brings people 3 D listening experience. But these systems could only accurately reproduce sound field at a central listening point which is called sweetspot. In order to solve this problem, this paper proposes a non-central zone sound field reproduction method PVMDZ(particle velocity matching between different zones) based on the physical property of sound. The proposed method matches the physical property of sound of non-central zone in reconstructed sound field with that of central zone in original sound field, so the reproduced non-central zone would produce the same listening experience as the central zone of the original system does. By experiments, we compare the performances of the proposed method with the traditional one, and the result proves that the sound field error of proposed method is reduced.
Classic sparse representation,as one of prevalent feature learning methods,is successfully applied for different computer vision tasks.However it has some intrinsic defects in object detection.Firstly,how to learn a discriminative dictionary for object detection is a hard problem.Secondly,it is usually very time-consuming to learn dictionary based features in a traditional exhaustive search manner like sliding window.In this paper,we propose a novel feature learning framework for object detection with the structure sparsity constraint and classification error minimization constraint to learn a discriminative dictionary.For improving the efficiency,we just learn sparse representation coefficients from object candidate regions and feed them to a kernelized SVM classifier.Experiments on INRIA Person Dataset and Pascal VOC 2007 challenge dataset clearly demonstrate the effectiveness of the proposed approach compared with two state-of-the-art baselines.
This paper proposes an unequal error protection(UEP)coding method to improve the transmission performance of three-dimensional(3D)audio based on expanding window fountain(EWF).Different from other transmissions with equal error protection(EEP)when transmitting the 3D audio objects.An approach of extracting the important audio object is presented,and more protection is given to more important audio object and comparatively less protection is given to the normal audio objects.Objective and subjective experiments have shown that the proposed UEP method achieves better performance than equal error protection method,while the bits error rates(BER)of the important audio object can decrease from 10^(–3) to 10^(–4),and the subjective quality of UEP is better than that of EEP by 14%.
YANG ChengHU RuiminSONG YuchengSU LiuyueWANG XiaochenCHEN Wei
