共查询到18条相似文献,搜索用时 78 毫秒
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在澄清嗓音源概念的基础上提出了一种以嗓音源变换函数为基础的声门发声效率估计方法。将嗓音源变换函数定义为声门上声学嗓音源与声门气流体积速度波在频域上的比值。通过精心设计的活体犬喉及人体发声实验分别在不同元音、压紧嗓音、气声、假声和典型喉病变条件下。采用稳态元音发声方式对这一新的声门发声效率估计方法实验研究;并与其他发声效率方法综合比较。结果表明,该方法能消除上声道传输与共鸣作用的影响,能反映不同发声方式的差异;频域平均声门发声效率反映了物理定义上的声门发声效率的变化,而声门基频发声效率的变化与AC/DC比值变化一致。 相似文献
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在简易磁屏蔽室中,用单通道的高温超导rf SQUID梯度计构成心磁图(MCG)测量系统,依照MCG测定部位的约定,测得数例成人胸前多点MCG.不计心动周期随时问的变化,用数据分析软件对这些MCG数据进行分析处理,得到包括了空间信息、可直观展示心脏电磁活动的二维心磁图谱(例如等磁图、时序等磁图、电流箭头图和时序电流箭头图等) 相似文献
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带有伴随a粒子探测器的密封中子管是一种具有特殊性能的新型中子管.它不仅由一般中子管所必备的离子源、加速系统、气压调节系统、靶和绝缘瓷壳组成,而且还具有能探测伴随产生的a粒子的装置.因此对它在结构上的设计,桌面的综合实验研究就极为重要;而离子源和引出加速系统是中子管的核心,加上对这两部分的特殊要求,本文就这两部分典型的桌面实验分析作以介绍.1实验分析实验在中子管桌面实验台上进行,装置如图豆所示.图11.高压电极2.玻璃钟罩3.橡胶密封圈4.离子源电源引线5.真空泵组6.引出电极7.离子源图中通人H。的针间还… 相似文献
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对称FIR(有限冲激响应)滤波器的严格的线性相位特性和系统稳定性在数据传输、图像处理等领域得到了广泛的应用。基于单点处理模式的传统数字滤波器能实时处理点信号,但在处理图像、语音等帧信号时,速度较慢,实时性不强。针对这个问题提出了块处理模式的解决方案。通过分析FIR滤波器的原理,设计出基于块处理模式的对称FIR滤波器,并在TMS320C5510芯片中实现。介绍了基于双指针循环寻址的滤波算法,并给出了相应的主要程序。计算机试验仿真表明块处理模式方案提高了帧信号的处理速度,滤波性能良好。 相似文献
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近红外传感器在汽车改造技术中的应用研究 总被引:4,自引:1,他引:3
利用反射式近红外传感器及语音录放组件,研究了汽车倒车防撞语音提示器。当汽车倒车时,只要距车身后尾一定的距离内有人或物体存在,就会有一部分红外光信号经人或物体反射回来,被与发射管同排安装的光敏接收管收到并转换成同频率的电信号后,由模块内部电路进行放大、解调、整形、比较处理后,在输出端输出控制信号,控制语音录放组件工作,告诉司机车后有人、车后有物体。由于近红外线传感器、语音录放组件均为一体化结构,成本低、接线简单、抗震能力强、测量准确、工作稳定可靠,适合在汽车上安装使用。 相似文献
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Corina J. van As-Brooks Florien J. Koopmans-van Beinum Louis C.W. Pols Frans J.M. Hilgers 《Journal of voice》2006,20(3):355-368
SUMMARY: Because of the aperiodicity of many tracheoesophageal voices, acoustic analysis of the tracheoesophageal voice is less straightforward than that of the normal voice. This study presents the development and testing of an acoustic signal typing system based on visual inspection of a narrow-band spectrogram that can be used by researchers for classification of voice quality in tracheoesophageal speech. In addition to this classification system, a selection of acoustic measures [median fundamental frequency, standard deviation of fundamental frequency, jitter, percentage of voiced (%Voiced), harmonics-to-noise ratio (HNR), glottal-to-noise excitation (GNE) ratio, and band energy difference (BED)] was computed to provide more insight into the acoustic components of tracheoesophageal voice quality. For clinical relevance, relationships between the acoustic signal types and an overall judgment of the voice were investigated as well. Results showed that the four acoustic signal types form a good basis for performing more acoustic analyses and give a good impression of the overall quality of the voice. 相似文献
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Two signal-processing algorithms, designed to separate the voiced speech of two talkers speaking simultaneously at similar intensities in a single channel, were compared and evaluated. Both algorithms exploit the harmonic structure of voiced speech and require a difference in fundamental frequency (F0) between the voices to operate successfully. One attenuates the interfering voice by filtering the cepstrum of the combined signal. The other uses the method of harmonic selection [T. W. Parsons, J. Acoust. Soc. Am. 60, 911-918 (1976)] to resynthesize the target voice from fragmentary spectral information. Two perceptual evaluations were carried out. One involved the separation of pairs of vowels synthesized on static F0's; the other involved the recovery of consonant-vowel (CV) words masked by a synthesized vowel. Normal-hearing listeners and four listeners with moderate-to-severe, bilateral, symmetrical, sensorineural hearing impairments were tested. All listeners showed increased accuracy of identification when the target voice was enhanced by processing. The vowel-identification data show that intelligibility enhancement is possible over a range of F0 separations between the target and interfering voice. The recovery of CV words demonstrates that the processing is valid not only for spectrally static vowels but also for less intense time-varying voiced consonants. The results for the impaired listeners suggest that the algorithms may be applicable as components of a noise-reduction system in future digital signal-processing hearing aids. The vowel-separation test, and subjective listening, suggest that harmonic selection, which is the more computationally expensive method, produces the more effective voice separation. 相似文献
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Some effects of talker variability on spoken word recognition 总被引:2,自引:0,他引:2
J W Mullennix D B Pisoni C S Martin 《The Journal of the Acoustical Society of America》1989,85(1):365-378
The perceptual consequences of trial-to-trial changes in the voice of the talker on spoken word recognition were examined. The results from a series of experiments using perceptual identification and naming tasks demonstrated that perceptual performance decreases when the voice of the talker changes from trial to trial compared to performance when the voice on each trial remains the same. In addition, the effects of talker variability on word recognition appeared to be more robust and less dependent on task than the effects of word frequency and lexical structure. Possible hypotheses regarding the nature of the processes giving rise to these effects are discussed, with particular attention to the idea that the processing of information about the talker's voice is intimately related to early perceptual processes that extract acoustic-phonetic information from the speech signal. 相似文献
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蛟龙号的水声通信机实现了世界上首次7000 m深度的潜器与母船间的图像、语音、数据和文字的水声通信传输。研究了适用于载人潜水器的水声通信信号处理。(1)它有4种通信功能:1)相干水声通信,传输速率为5~15 kbps,用于传输图像;2)非相干水声通信,传输速率300 bps,传输文字、指令和数据;3)扩频水声通信,传输速率16 bps,传输指令;4)水声语音通信,采用单边带调制技术传输语音。(2)相干水声通信信号处理方法主要是自适应多普勒补偿的多通道自优化判决反馈自适应均衡器,它与Turbo码级联工作,同时采用定长编码的小波图像压缩方法。(3)声呐线阵吊放至水中一定深度,实现空间分集合并技术。(4)太平洋水域试验表明,水声通信机的作用距离几乎覆盖了所有地球海洋的深度,7s或14s传输一幅光图或声图。 相似文献
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本文介绍近30年来水声信号处理领域理论研究的新进展和在声纳设计中的应用。包括水声信号建模、声场匹配、海洋波导和内波现象的探索和研究、声矢量场信息获取和处理,低频水声信道的时/空相关特性,水下目标辐射噪声的不变特征量提取和检测技术,水下语音、图像传输和抗干扰技术。同时概述,声纳设计的前沿领域:大孔径拖曳线列阵声纳、高分辨力合成孔径声纳、深海传呼机等的发展情况。 相似文献
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