排序方式: 共有94条查询结果,搜索用时 15 毫秒
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小波变分辨率频谱特征静音检测和短时自适应混音算法 总被引:1,自引:0,他引:1
静音检测算法使用两种语音感觉特征与变分辨率频谱的Mel频率倒谱系数组合成音频特征,采用多门限过零率对静音进行初判,并通过二分类支持向量机对组合语音特征进行分类;实时混音算法使用每一路音频的短时能量作为混音权重.测试表明,静音检测算法在不同信噪比下语音识别正确率高于G.729b静音检测算法;实时混音算法听觉测试优于传统的算法,并且混音计算延时低,满足网络实时传输的要求;两种算法同时应用于视频会议系统,视频会议服务器的运算量低于使用了G.729b静音检测算法的视频系统. 相似文献
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基于ARM11 MPCore的多核间通信机制研究 总被引:1,自引:0,他引:1
嵌入式应用中采用SMP(对称多处理)系统所面临的主要难题是多处理器内核之间的通信.对 ARM11 MPCore 处理器的多核间通信机制进行研究,并结合 Linux-2.6.19 对这一通信机制的具体实现作深入分析,并在 RealView Emulation Baseboard 上面进行相应的验证.实验结果表明,多核间通信机制可以使多线程之间的交互时间减小为原来的16.7%,从而提升并行计算系统的性能. 相似文献
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The variable block-size motion estimation(ME) and disparity estimation(DE) are adopted in multi-view video coding(MVC) to achieve high coding efficiency. However, much higher computational complexity is also introduced in coding system, which hinders practical application of MVC. An efficient fast mode decision method using mode complexity is proposed to reduce the computational complexity. In the proposed method, mode complexity is firstly computed by using the spatial, temporal and inter-view correlation between the current macroblock(MB) and its neighboring MBs. Based on the observation that direct mode is highly possible to be the optimal mode, mode complexity is always checked in advance whether it is below a predefined threshold for providing an efficient early termination opportunity. If this early termination condition is not met, three mode types for the MBs are classified according to the value of mode complexity, i.e., simple mode, medium mode and complex mode, to speed up the encoding process by reducing the number of the variable block modes required to be checked. Furthermore, for simple and medium mode region, the rate distortion(RD) cost of mode 16×16 in the temporal prediction direction is compared with that of the disparity prediction direction, to determine in advance whether the optimal prediction direction is in the temporal prediction direction or not, for skipping unnecessary disparity estimation. Experimental results show that the proposed method is able to significantly reduce the computational load by 78.79% and the total bit rate by 0.07% on average, while only incurring a negligible loss of PSNR(about 0.04 d B on average), compared with the full mode decision(FMD) in the reference software of MVC. 相似文献
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