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1.
杜鹏  房宁  赵群飞 《计算机工程》2012,38(13):260-262,265
为解决动画流与语音流的同步问题,设计并实现一种人脸语音同步动画系统。将所有中文音素分为16组中文可视音素,并用输入的人脸图像合成对应的关键帧,分析输入文本得到中文可视音素序列和动画的关键帧序列,将该关键帧序列与语音流对齐,在关键帧之间插入过渡帧的同时,播放语音流和动画流,以实现人脸语音同步动画。实验结果表明,该系统能产生符合人们视觉和听觉感受的人脸语音同步动画。  相似文献   
2.
许友亮  张连海  屈丹  牛铜 《计算机工程》2012,38(11):160-162,166
提出一种基于长时性信息的音位属性检测方法,该方法通过高、低两层时间延迟神经网络(TDNN)进行实现,低层TDNN在短时特征上进行音位属性的检测,高层TDNN在低层检测结果的基础上,对更长时段上的信息进行融合。实验结果表明,引入长时性特征使得音位属性检测率提升约3%,将音位属性后验概率作为音素识别系统的观测特征,使用长时性特征的识别结果提升约1.7%。  相似文献   
3.
为提高连续语音识别中的音素识别准确率,采用深可信网络提取语音音素后验概率进行音素识别.首先利用受限玻尔兹曼机的学习原理,对深可信网络进行逐层的预训练;然后通过增加一个“软最大化(softmax)”输出层,得到用于音素状态后验概率检测的深层神经网络,并采用后向传播算法进行网络权值的精细调整;最后以后验概率为HMM发射概率,使用Viterbi解码器进行音素识别.针对TIMIT语料库的实验结果表明,该系统的音素识别率优于GMM/HMM,MLP/HMM和TANDEM系统性能.  相似文献   
4.
Cross-modal semantic priming and phoneme monitoring experiments investigated processing of word-final nonreleased stop consonants (e.g., kit may be pronounced /kIt/ or /kI/), which are common phonological variants in American English. Both voiced /d/ and voiceless /t/ segments were presented in release and no-release versions. A cross-modal semantic priming task (Experiment 1) showed comparable priming for /d/ and /t/ versions. A second set of stimuli ending in /s/ were presented as intact, missing /s/, or with a mismatching final segment and showed significant but reduced priming for the latter two conditions. Experiment 2 showed that phoneme monitoring reaction time for release and no-release words and onset mismatching stimuli (derived pseudowords) increased as acoustic-phonetic similarity to the intended word decreased. The results suggest that spoken word recognition does not require special mechanisms for processing no-release variants. Rather, the results can be accounted for by means of existing assumptions concerning probabilistic activation that is based on partial activation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
5.
Four experiments used the psychological refractory period logic to examine whether integration of multiple sources of phonemic information has a decisional locus. All experiments made use of a dual-task paradigm in which participants made forced-choice color categorization (Task 1) and phoneme categorization (Task 2) decisions at varying stimulus onset asynchronies. In Experiment 1, Task 2 difficulty was manipulated using words containing matching or mismatching coarticulatory cues to the final consonant. The results showed that difficulty and onset asynchrony combined in an underadditive way, suggesting that the phonemic mismatch was resolved prior to a central decisional bottleneck. Similar results were found in Experiment 2 using nonwords. In Experiment 3, the manipulation of task difficulty involved lexical status, which once again revealed an underadditive pattern of response times. Finally, Experiment 4 compared this prebottleneck variable with a decisional variable: response key bias. The latter showed an additive pattern of responses. The experiments show that resolution of phonemic ambiguity can take advantage of cognitive slack time at short asynchronies, indicating that phonemic integration takes place at a relatively early stage of spoken word recognition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
6.
The aims of this study were to investigate the adequacy of electronic voice keys for the purpose of measuring naming latency and to test the assumption that voice key error can be controlled by matching conditions on initial phoneme. Three types of naming latency measurements (hand-coding and 2 types of voice keys) were used to investigate effects of onset complexity (e.g., sat vs. spat) on reading aloud (J. R. Frederiksen & J. F. Kroll, 1976, A. H. Kawamoto & C. T. Kello, 1999). The 3 measurement techniques produced the 3 logically possible results: a significant complexity advantage, a significant complexity disadvantage, and a null effect. Analyses of the performance of each voice key are carried out, and implications for studies of naming latency are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
7.
Previous research has suggested that the initial portion of a word activates similar sounding words that compete for recognition. Other research has shown that the number of similar sounding words that are activated influences the speed and accuracy of recognition. Words with few neighbors are processed more quickly and accurately than words with many neighbors. The influences of the number of lexical competitors in the initial part of the word were examined in a shadowing and a lexical-decision task. Target words with few neighbors that share the initial phoneme were responded to more quickly than target words with many neighbors that share the initial phoneme. The implications of onset-density effects for models of spoken-word recognition are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
8.
Many models of spoken word recognition posit the existence of lexical and sublexical representations, with excitatory and inhibitory mechanisms used to affect the activation levels of such representations. Bottom-up evidence provides excitatory input, and inhibition from phonetically similar representations leads to lexical competition. In such a system, long words should produce stronger lexical activation than short words, for 2 reasons: Long words provide more bottom-up evidence than short words, and short words are subject to greater inhibition due to the existence of more similar words. Four experiments provide evidence for this view. In addition, reaction-time-based partitioning of the data shows that long words generate greater activation that is available both earlier and for a longer time than is the case for short words. As a result, lexical influences on phoneme identification are extremely robust for long words but are quite fragile and condition-dependent for short words. Models of word recognition must consider words of all lengths to capture the true dynamics of lexical activation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
9.
适合《水情信息编码标准》报汛系统的开发研制   总被引:1,自引:0,他引:1  
水情报汛站与水情信息分中心之间的水文情报传输是水情信息传输的“瓶颈”。文中介绍了适合新的《水情信息编码标准》要求的报汛系统的组成、功能、特点以及应用前景。该系统适用于新标准情况下水情报汛站与地市级水情信息分中心的水情信息传输,为水情报汛站贯彻实施《水情信息编码标准》提供了简单易行的手段。  相似文献   
10.
This paper examines the applicability of some learning techniques to the classification of phonemes. The methods tested were artificial neural nets (ANN), support vector machines (SVM) and Gaussian mixture modeling (GMM). We compare these methods with a traditional hidden Markov phoneme model (HMM), working with the linear prediction-based cepstral coefficient features (LPCC). We also tried to combine the learners with linear/nonlinear and unsupervised/supervised feature space transformation methods such as principal component analysis (PCA), independent component analysis (ICA), linear discriminant analysis (LDA), springy discriminant analysis (SDA) and their nonlinear kernel-based counterparts. We found that the discriminative learners can attain the efficiency of HMM, and that after the transformations they can retain the same performance in spite of the severe dimension reduction. The kernel-based transformations brought only marginal improvements compared to their linear counterparts.  相似文献   
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