基于模糊决策的激光威胁源识别方法

激光威胁源识别是激光告警数据处理的一个重要方面,识别方法直接影响着识别结果的准确性。基于激光信号各技术参数在表明威胁源时都具有一些模糊性的特点,提出了一种基于模糊决策的激光威胁源识别方法。通过运用模糊决策理论,建立了激光能量、波长、重频等技术参数的模糊化数学模型和激光威胁源识别的模糊决策规则库,设计出模糊决策专家系统。在激光告警系统使用不同类型传感器,获得激光波长、重频和脉冲特性等技术参数后,可借助此模糊决策专家系统,判明激光威胁源的类型。仿真结果表明：该方法能够准确快捷地实现激光威胁源的识别,具有一定的应用价值,且可为激光告警的其他数据融合研究提供参考。     

基于等价型模糊神经网络的战场辐射源识别算法

针对多变量、环境干扰复杂的现代战场电子对抗辐射源识别非线性系统,应用早期的识别方法已经无法满足辐射源识别系统的精度要求,采用等价型模糊神经网络,产生模糊规则和隶属函数,再基于这些规则产生模糊逻辑推理来构造模式识别算法.仿真结果表明:该算法与传统模式识别方法相比具有更高的识别能力和较强的抗干扰能力,大大提高了战场辐射源识别的正确率和可靠性.     

一种安全事件模糊关联规则挖掘算法

随着信息技术和数据库技术的飞速发展,从大量的数据中获取有用的信息和知识变得越来越重要。模糊关联规则挖掘是数据挖掘中针对数量型属性关联规则发现的一种有效方法。提出了一种基于矩阵的模糊关联规则挖掘算法,并将其应用于网络安全事件关联分析中,通过对DARPA标准数据集的分析,得出了预期数量的关联规则,并成功验证了某些攻击场景,该模糊关联规则挖掘算法取得了较好的实验结果。     

基于T-S模型的FNN降水粒子相态识别方法

提出一种基于T-S(Takagi-Sugeno)模型的模糊神经网络(Fuzzy Neural Network,FNN)降水粒子相态识别方法。该方法建立一种多层前馈的模糊神经网络,在对双线偏振气象雷达接收的偏振参量进行模糊化、规则计算、模糊推理和退模糊处理基础上,利用模糊神经网络误差反馈的思想自适应的调节不同降水类型各偏振参量隶属函数的参数,保证降水粒子相态识别的精度要求。经过实测数据的处理结果证明了该方法的有效性。     

基于激光传感探测技术的多机器人编队协调控制研究

传统编队协调控制方易产生部分路径数据丢失,机器人产生方向角误差大,为此设计基于激光传感探测技术的多机器人编队协调控制方法.利用激光传感探测技术获取机器人路径数据,采用一致性数值关系更新获取得到的路径数据,设定分散参数控制路径数据发生丢失,制定机器人编队规则,积分处理机器人在行驶路径上产生的滑面,设计机器人终端协调控制策...     

基于Relax散射点特征提取的舰船目标识别方法

针对基于高分辨距离像(HRRP)的舰船目标识别问题,提出了一种基于Relax散射点特征提取和设计了基于散射中心最近邻模糊分类器的目标识别方法.首先对数据进行预处理,然后基于Relax算法提取出散射中心,最后通过最近邻模糊分类器进行识别匹配.通过仿真4类军民船目标的数据进行测试,验证结果表明该方法在舰船目标识别领城具有很...     

参数自适应的析取云模糊置信规则识别方法

为获得准确的模糊置信规则结构参数,提出了参数自适应的析取云模糊置信规则识别方法.为完成模糊域的自适应划分,提出了基于频数统计的双门限检测方法和基于包含度的双门限检测方法.用云模型作为模糊集,改变熵系数和超熵系数,实现对模糊集形状的调整;前提属性的联接设置为析取逻辑关系,改进了证据的基本概率赋值方式,对规则权重和属性权重...     

噪声自适应的多数据流复合子带语音识别方法

首先针对现有丢失数据语音识别技术中的边缘化(marginalisation)技术在特征运用上的局限,提出了一种倒谱特征分量的可靠性估计方法,将边缘化技术推广到常用的倒谱语音识别系统中; 然后利用基于全带和子带倒谱特征的边缘化识别器在不同噪声中的互补性能,提出了一种噪声自适应的多数据流复合子带语音识别方法。实验结果表明,所提识别方法可以自适应地选出全带和子带数据流中受噪声影响较小者并以之为主要依据进行识别,有效地提高了识别系统在多变噪声环境中的鲁棒性。     

大数据环境下并行数据流预测及优化方法

以模糊集成联机分析处理(On-Line Analytical Processing,OLAP)为基础对关联规则挖掘算法进行改进,该算法为多维联机研究提供一种关联规则计算架构。基于模糊数据立方体的知识发现,为用户提供灵活的多维数据层次抽象模式。在多维数据集的多维属性处理中,引入模糊数据立方体作为问题措施补充,并利用不同层次的模糊关联规则构造模糊数据立方体,然后利用权重和多层次的概念构建模糊加权多层次关联规则。最后,通过对所提算法在合成数据集以及2000年中国人口普查的数据仿真测试,验证了基于OLAP的挖掘方法要比离散关联规则挖掘方法、单独支持阈值关联规则及最小挖掘项集关联规则三种对比算法,在最小支持度、置信度、权重均值等指标上,性能更加优异。     

关联规则中基于模糊遗传算法的研究与改进挖掘技术

网络数据通常以爆炸式的聚集形式出现,导致曾提出的关联规则挖掘方法挖掘性能不好。基于上述原因,提出一种关联规则中基于模糊遗传算法的挖掘方法,此方法通过构建挖掘模型,将关联规则与模糊遗传算法融合在一起,进而给出待挖掘数据的适应度函数,并使用阈值对其进行限制。模糊遗传算法将对适应度函数进行交叉分配和编译分配,以改进方法的隶属度线性状态,获取更为有效的挖掘结果。实验结果表明,改进后的方法挖掘稳定性较强,挖掘精度较高,且挖掘时间较少。     

Blind Model Selection for Automatic Speech Recognition in Reverberant Environments

This communication presents a new method for automatic speech recognition in reverberant environments. Our approach consists in the selection of the best acoustic model out of a library of models trained on artificially reverberated speech databases corresponding to various reverberant conditions. Given a speech utterance recorded within a reverberant room, a Maximum Likelihood estimate of the fullband room reverberation time is computed using a statistical model for short-term log-energy sequences of anechoic speech. The estimated reverberation time is then used to select the best acoustic model, i.e., the model trained on a speech database most closely matching the estimated reverberation time, which serves to recognize the reverberated speech utterance. The proposed model selection approach is shown to improve significantly recognition accuracy for a connected digit task in both simulated and real reverberant environments, outperforming standard channel normalization techniques.     

民航陆空通话语音识别BiLSTM网络模型

民航陆空通话对民航飞行安全十分重要,但因其通话模式有特殊的语法结构与发音方式,日常语音识别声学模型无法有效应用于民航陆空通话的语音处理问题。针对民航陆空通话的特殊语境,本文提出了基于双向长短时记忆网络(BiLSTM)的民航陆空通话语音识别方法。首先,提取民航陆空通话语音的FBANK特征作为输入,以时序链式连接(CTC)为目标函数,训练BiLSTM网络得到BiLSTM/CTC模型。然后,利用声学模型,语言模型与陆空通话词典实现民航陆空通话的语音识别,并结合数据增强与数据迁移对模型进行增强训练提高语音识别性能。实验结果表明本文提出的方法适用于民航陆空通话语音识别,并且数据增强模型可有效降低民航陆空通话语音识别的词错误率。      

背景噪声下的语音识别技术研究

研究了3种背景噪声下与说话人有关的孤立词语音识别方法。即语音前端声学处理法、正则相关分析的谱变换补偿方法和同模极点增加法。实验结果表明,这3种方法都有效地提高了噪声环境中语音识别率,其中较好的方法在强噪声环境中(信噪比为0 dB)的语音识别率达到80%以上,为信噪比较低的噪声环境中自动语音识别展现了美好前景。     

Adaptation of hidden Markov model for telephone speech recognitionand speaker adaptation

The authors propose a channel compensation method for the hidden Markov model (HMM) parameters in automatic speech recognition. The proposed approach is to adapt the existing reference models to a new channel environment by using a small amount of adaptation data. The concept of HMM parameter adaptation by incorporating the corresponding phone-dependent channel compensation (PDCC) vectors is applied to improve the performance of speech recognition. Two extended PDCC techniques are presented. One is based on the refinement of PDCC using vector quantisation. The other is based on the interpolation of compensation vectors. Both techniques are evaluated on the experiments on telephone speech recognition and speaker adaptation. The experimental results show that the performance can be significantly improved     

Continuous Mandarin speech recognition for Chinese language withlarge vocabulary based on segmental probability model

The author presents a study of large-vocabulary continuous Mandarin speech recognition based on a segmental probability model (SPM) approach. The SPM was found to be very suitable for recognition of isolated Mandarin syllables especially considering the monosyllabic structure of the Chinese language. To extend the application of the model to continuous Mandarin speech recognition, a concatenated syllable matching (CSM) algorithm in place of the conventional Viterbi search algorithm is first introduced. Also, to utilise the available training material efficiently, a training procedure is proposed to re-estimate the SPM parameters using the maximum a posteriori (MAP) algorithm. A few special techniques integrating acoustic and linguistic knowledge are developed further to improve the performance step by step. Preliminary experimental results show that the final achievable rate is as high as 91.62%, which indicates a 18.48% error rate reduction and more than three times faster than the well studied subsyllable-based CHMM     

Feature classification criterion for missing features mask estimation in robust speaker recognition

Currently, many speaker recognition applications must handle speech corrupted by environmental additive noise without having a priori knowledge about the characteristics of noise. Some previous works in speaker recognition have used the missing feature (MF) approach to compensate for noise. In most of those applications, the spectral reliability decision step is performed using the signal to noise ratio (SNR) criterion, which attempts to directly measure the relative signal to noise energy at each frequency. An alternative approach to spectral data reliability has been used with some success in the MF approach to speech recognition. Here, we compare the use of this new criterion with the SNR criterion for MF mask estimation in speaker recognition. The new reliability decision is based on the extraction and analysis of several spectro-temporal features from across the entire speech frame, but not across the time, which highlight the differences between spectral regions dominated by speech and by noise. We call it the feature classification (FC) criterion. It uses several spectral features to establish spectrogram reliability unlike SNR criterion that relies only in one feature: SNR. We evaluated our proposal through speaker verification experiments, in Ahumada speech database corrupted by different types of noise at various SNR levels. Experiments demonstrated that the FC criterion achieves considerably better recognition accuracy than the SNR criterion in the speaker verification tasks tested.     

矿井旋转机组碰摩声发射源监测系统的设计

研究提出了一种基于声发射源特征识别的矿井旋转机组碰摩故障检测方法。为了能对矿井旋转机组实时远程监控并实现分布式网络化管理,设计了一种基于ARM嵌入式系统的矿井旋转机组振动监测系统。针对高斯混合模型在建模时需要较多的训练数据的缺陷,提出了一种基于模糊矢量量化混合模型的声发射识别方法,该方法综合考虑了模糊集理论、矢量量化和高斯混合模型的优点,通过用模糊矢量量化误差尺度取代传统高斯混合模型的输出概率函数,减少了建模时对训练数据量的要求,提高了模型精度和识别速度。通过实验观察上位机输出结果,验证了监测数据的实时性和准确性,达到了对旋转机组运行的状态信息实时监测和故障诊断的要求。     

A NEW ACOUSTIC PERCEPTUALl MODEL

On the basis of psychological acoustic theories and experiments, this paper proposes an acoustic model which is based on acoustic perceptual feature. Compared with the physiological acoustics based acoustic model, this model is more suitable to represent human's perceptual features of continuous speech, so it is suitable for recognition of continuous speech.     

基于声学模型的不良语音识别技术研究

不良语音识别技术是在高清音视频业务中监测不良信息的有效手段。本文提出了一个基于声学模型的不良语音识别框架。并针对框架中特征提取、声学模型构建、不良语音判定模型三个重要部分的实现方法进行分析描述。并列举了各种方法的优缺点。对构建高效的不良语音识别系统具有较高的参考价值。     

一种新的听觉感知模型

本文根据心理声学的基本理论和实验资料,提出了一个基于听觉感知特征的听觉模型,与基于生理声学的听觉模型相比较,该模型更能反映人对连续自然语音的感知特性,因而适于对连续语音的识别。