煤矿井下语音通讯系统的实现

基于飞思卡尔单片机DG128作为系统的核心控制,采用一款高性能多速率语音编码/解码芯片AMBE-1000,设计了一种煤矿机车语音通讯电路的设计方案。现场实验结果表明,该设计方案不仅语音质量好,而且系统稳定、抗干扰性强。     

单片机控制声动同步机械原理示教柜

本教学演示柜由单片机控制各机械模型运动演示,ＶＣＤ机播放语音解说,使教学内容与相应模型的运动演示同步,达到教学自动化,形象直观。文中离控制系统结构及工作原理。     

利用频谱搬移控制语音转换中的共振峰

在研究频谱搬移方法和分析语音共振峰性质及变化规律的基础上,提出了利用频谱搬移调整共振峰的算法,能有效控制共振峰轨迹合成声道模型。讨论了语音转换的实现流程,并将合成的声源模型应用于男、女声之间的转换,实验结果和分析表明,该方法可实现对共振峰的灵活控制,使语音转换具有更高的融合度。     

基于HHT变换的病态嗓音特征提取及识别研究

主要介绍基于HHT变换提取的瞬时能量(A)和瞬时频率(f)的标准差参数作为病态嗓音特征参数的有效性,详细描述了A-f新特征参数的提取过程,并利用DHMM模型对A-f标准差新特征参数,与语音识别中常用的MFCC系数进行识别。识别结果表明,由HHT变换提取的A-f标准差参数更适合于描述病态嗓音,更能有效区分病态嗓音和正常嗓音。     

噪音情况下语音端点检测方法的研究

语音信号处理中减谱法是一种传统的降噪方法,但减谱法利用固定的无音片段作为噪声样本容易产生误差。谱熵法是一种有效的端点检测方法,但在低信噪比环境下,检测效果将大大降低,并且门限估计也采用初始的固定无音片段。为此,提出了一种降噪和端点检测同步的方法。实验结果表明,該方法可以得到较高正确率的端点检测结果。     

一种基于塑料光纤的计算机网络的研制与开发

提出一种基于塑料光纤(POF)传输媒质的计算机网络.该网络由个人计算机、光发射/接收单元和650nm的POF组成,光发射/接收模块用Agilent公司生产的HFBR-1505/2505A.为满足数字光纤通信系统对线路编码的要求,采用传号反转码并由光收发单元实现码型变换.研究结果表明,该网络具有高带宽、高可靠性的特点.通过编写的Visual C 网络语音电话程序,验证了该方案的有效性和可行性.     

Motormouth: Mere exposure depends on stimulus-specific motor simulations.

The authors apply an embodied account to mere exposure, arguing that through the repeated exposure of a particular stimulus, motor responses specifically associated to that stimulus are repeatedly simulated, thus trained, and become increasingly fluent. This increased fluency drives preferences for repeated stimuli. This hypothesis was tested by blocking stimulus-specific motor simulations during repeated exposure. In Experiment 1, chewing gum while evaluating stimuli destroyed mere exposure effects (MEEs) for words but not for visual characters. However, concurrently kneading a ball left both MEEs unaffected. In Experiment 2, concurrently whispering an unrelated word destroyed MEEs for words but not for characters, even when implemented either exclusively during the initial presentation or during the test phase and when the first presentation involved an evaluation or a mere study of the stimuli. In Experiment 3, a double dissociation between 2 classes of stimuli was demonstrated, namely, words (oral) and tunes (vocal). A concurrent oral task (tongue movements) destroyed MEEs for words but not for tone sequences. A concurrent vocal task (humming “mm-hm”) destroyed MEEs for tone sequences but not for words. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The science of sex appeal: An evolutionary perspective.

Growing evidence shows that features we find attractive in members of the opposite sex signal important underlying dimensions of health and reproductive viability. It has been discovered that men with attractive faces have higher quality sperm, women with attractive bodies are more fertile, men and women with attractive voices lose their virginity sooner, men who spend more money than they earn have more sex partners, and lap dancers make more tips when they are in the fertile phase of their menstrual cycle. This paper highlights recent evidence showing that the way we perceive other people has been shaped by our evolutionary history. An evolutionary approach provides a powerful tool for understanding the consistency and diversity of mating preferences and behaviors across individuals and cultures. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

无线双模数字对讲机的设计与实现

传统模拟对讲机由于频谱利用率低、抗干扰性能差、频道开放、不具有保密性等原因已经很难满足需求。文章介绍的无线双模对讲机用于改善传统模拟对讲机抗干扰及保密性差的缺点,所提双模对讲机设计方案综合了集群和无中心两种工作模式功能,具有灵活设置与抗干扰性强的优点。文中重点设计了对讲机的软硬件结构,还对音频编解码进行了讨论分析。     

实时实现低延迟码激励线性预测编码

扼要地介绍低延迟码激励激线性预测ＣＣＩＴＴ１６ｋｂｉｔ／ｓＬＤ－ＣＥＬＰ语音编码方案和用高速信号处理器ＴＭＳ３２０Ｃ３０实时实现的有关技术。