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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现有的录波分析软件多为C/S架构,兼容性较差,客户端软件升级与服务器维护易给用户带来使用不便。随着网络发展,电力系统运行管理趋于网络化,本系统采用B/S架构,顺应了这一趋势。本系统服务器可通过TCP/IP协议同时接收协议转换器转发的常规存储卡、基于IEC61850-9-1标准的采样值和遵循IEC61850-8-1标准的面向通用对象的数字化变电站事件(GOOSE)等三种数据报文,排除硬件上的差异,从而实现录波数据的快速采集、高效启动判断、综合分析处理与保存,通过Web发布以供用户远程浏览信息及波形,下载文件,很好地满足了数字化变电站对录波系统的新要求。 相似文献
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本文推导了DS-UWB信道估计中最大比合并(maximum ratio combining)结合滑动窗(sliding window)算法的理论公式,给出DS-UWB系统中最大似然(maximum likelyhood)算法公式并与之比较,经理论分析和计算机仿真证明,在没有码间干扰的条件下,MRC-SW算法等价于一阶ML算法,其性能随着输出端采样频率的提高逼近ML算法.在接收端采样频率一定的条件下,本文还提出了一种通过延迟重复发送导频信号等效提高采样频率的方法,可以在不改变接收端硬件电路的情况下,大幅提高算法性能. 相似文献
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本文介绍了一种利用Install Shield制作数据库软件安装版的方法,并着重阐述了如何利用InstaUScript语言来注册设置ODBC. 相似文献
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