基于概率DP匹配法的噪声环境下说话人识别方法的研究

提出了一种在噪声环境下利用复数语音帧段主分量特征输入的概率DP匹配的说话人识别算法。通过对噪吉环境下与文本无关的说话人识别实验，验证了这种方法的有效性。     

基于统计匹配的VoIP说话人特征补偿算法

在VoIP说话人识别中,当使用原始语音(未经过编译码处理)训练的说话人模型识别经过语音编译码处理的测试语音时,系统的识别性能会发生下降.本文给出了一种基于统计匹配和EM(期望最大化)算法的VoIP说话人特征(12阶的LPCC系数)补偿算法,其中对假设失真特征与未失真识别特征间符合非线性(二次函数型)和线性函数关系时的函数参数进行了估计,并使用得到的补偿函数对失真特征进行补偿.实验结果表明,该特征补偿算法对VoIP中广泛使用的G.729 8kb/s、G.723.1 6.3kb/s、G.723.1 5.3kb/s编译码所造成的识别性能下降有较大的改善,其性能也优于CMS(倒谱均值减)方法.     

基于ARM的说话人识别系统的研究与实现

提出了一种基于压缩感知(CS)的说话人识别算法以及在ARM系统中的实现,首先,介绍压缩感知理论框架,提出说话人识别可以与压缩感知理论相结合的依据;其次,提出基于压缩感知的说话人识别算法的基本方法,即建立说话人语音特征数据库和基追踪匹配得到最大均值系数,其中,语音特征向量由GMM均值超向量核算法得到,大量实验数据表明,该方法一定程度上提高了识别率,并且在说话人集合较大的情况下识别效果较好。     

基于多特征有效组合的说话人识别

通过分析当今说话人识别系统中常用的一些特征参数，以提高说话人识别的识别率为目的，在Matlab 6．5软件环境下提出了将Mel频率倒谱(MFCC)、线性预测倒谱(LPCC)及他们的一阶差分和基音周期等多种特征有效结合进行说话人识别的方法。采用短时自相关法提取基音周期，在识别过程中采用改进的动态规整算法，将模板的匹配过程与检验量的计算分离开，每帧给出一个说话人辨认结果，最后综合各帧的辨认结果，得出最佳匹配结果。经过多次实验证明，采用以上方法使用多特征有效结合比单个使用各种特征效果要好，能在一定程度上提高系统区分说话人的能力。     

改进的非匹配信道法庭自动说话人识别方法

在新的似然比法庭证据评估体系下,为降低对问题语音和嫌疑人语音样本数量的要求,提出了改进的基于GMM-UBM识别核心的法庭自动说话人识别系统。为降低信道差异对法庭自动说话人识别系统性能的影响,提出了一种不同信道间说话人模型补偿与Logistic回归混合处理的方法。固定电话信道和移动电话信道的实验结果表明:改进的自动识别系统在非匹配信道中使用4秒的测试语音,与未使用模型补偿的系统相比,错误认定率从28.95%下降为6.32%,大幅度提高了系统在非匹配条件下的可靠性。     

针对说话人识别进行的加权小波去噪方法

采用改进的小波去噪方法对含噪语音进行了前端处理,并针对说话人识别的特点,在小波重构之前对各小波系数进行加权处理;识别过程采用GMM识别算法。实验结果显示,相比纯粹使用MFCC作为识别特征的说话人识别提出的方法对于含噪说话人识别有明显的优越性。该方法对实时说话人识别有很好的指导作用。     

基于聚类统计与文本无关的说话人识别研究

从语音信号特征矢量的空间映射出发,在二元分裂算法的基础上提出了一种裂合并的聚类算法,并用于与本文无关的说话人识别研究,初步建立了基于聚类统计的开放系统,该系统用说话人语音信号在特征空间的分布中心建立参考模板,用聚类统计中心代替待识语音段的特征矢量进行了模式匹配计算,系统规模的越大,节省的计算量就越多。在小规模说话人辨认系统的实践研究中,研究了特征矢量的加权,语音段的时长以及a因子的选择对系统性能的影响。     

基于BP神经网络的说话人识别技术的实现

说话人识别就是从说话人的一段语音中提取出说话人的个性特征,通过对这些个人特征的分析和识别,从而达到对说话人进行辨认或者确认的目的。神经网络是一种基于非线性理论的分布式并行处理网络模型,具有很强的模式分类能力及对不完全信息的鲁棒性,为说话人识别技术提供了一种独特的方法。BP(Back-propagation Neural Network)是一种非循环多级网络训练算法,有输入层,输出层和N个隐含层组成。首先概述了语音识别技术,介绍了BP神经网络训练过程的7个步骤及其模型,如何建立BP神经网络模型。同时介绍了与其相关的特征参数的提取,神经网络的训练和识别过程,最后,通过编程在Linux系统下实现说话人身份的识别。     

一种新的基于模板匹配的车型识别

为提高当前车型检测在交通场景下的实时性和准确性,提出了一种新的基于模板匹配的车型识别方法。首先,基于车辆区域的显著性设计了非均匀采点,然后采用梯度量化,二进制图像,线性化内存等手段实现模板的并行化匹配,最后通过kmeans聚类产生多层次的车型模板索引,实现快速查表的车型匹配算法。实验表明,该算法能实时高效地实现交通场景下的车型识别。     

基于并行化的说话人识别方法的研究

随着人工智能时代的到来,语音信号处理已经成为热门的研究方向之一。基于并行化的说话人识别方法,利用拾音器阵列采集多路语音信号,传输到嵌入式GPU系统,在嵌入式GPU系统内依次进行预处理、并行化特征提取和特征匹配并把输出结果进行显示。针对现在大数据量的语音信号进行处理,对说话人识别算法进行了并行化改进,优化了语音信号处理等过程,提高说话人识别系统的效率和准确率,增强了说话人识别系统的鲁棒性。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.