共查询到19条相似文献,搜索用时 125 毫秒
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0引言头相关传输函数(HRTF)定义为自由场情况下从声源到双耳的频域声学传输函数[1]。虚拟听觉重放则是应用一对HRTF对输入信号进行滤波并用耳机重放,以产生相应方向的虚拟声源。HRTF与个体的生理结构和尺寸密切相关,采用非个性化HRTF容易导致虚拟声源定位错误,特别是前后和上下镜像方位混乱以及角度错误[2]。理想的虚拟听觉重放需要个性化的HRTF处理,但会使信号处理变的复杂。 相似文献
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0引言头相关传输函数(HRTF)表征了自由场情况下声波从声源到双耳的传输过程中,生理结构和声波的相互作用[1]。高质量的虚拟听觉重放需要采用个性化HRTF进行双耳信号合成。由于HRTF和生理结构(例如头部、耳廓等)密切相关,通过个性化生理参数近似获取个性化HRTF成为可能[2]。Zotkin提出个性化HRTF的生理参数匹配法,即从HRTF基准数据库中挑选出与受试者生理参数相似度高 相似文献
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0引言双耳录音时录音点的位置一般选择在耳道入口处或鼓膜位置处。国外相关学者认为,耳道的传输特性是与方向无关的,但不同人研究成果中得到的与方向无关的频段各不相同,且对真人耳道测量中考察的方向仅为水平面上3、4个有限方向[1]。为考察声波导管理论对耳道的适用性,以及不同录音点位置选择对声源定位听感上的影响。本文设计制作了三种耳道模型,研究耳道传输特性以及录音点选取对听感定位的影响。 相似文献
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声源被动测向和定位属于水声学中的逆问题。利用浅海水声环境中传播波的简正波特性,将平面波波束形成的概念加以推广构成模波束形成,可以实现声源定位(深度和距离)或改善两维搜索条件下的信号检测能力。本文论述了这种方法,并给出了常规和最佳模波束形成的计算机模拟实验结果;模拟实验的基阵数据,分别来自对模程序产和的声场和实际声场的采集。文中还研究了实际环境条件下可能出现的模型失配及其对两种模波束形成的影响,以及相应的Robust处理问题。 相似文献
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0引言近年来,智能手机和平板电脑等移动终端日益普及,用户对移动多媒体应用中音视频质量的要求也不断提高。作为适合耳机重放的双耳录音技术[1]因其逼真的声场还原能力越来越受到人们的重视。在实际应用中,音频一般会伴随着相应的视频信息同时出现,因此本文针对与声学头模双耳录音信号同步的视频信息,探究了视觉辅助信息对声学头模双耳录音听感效果的影响。 相似文献
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在用耳机观影时,音源位置会随人头姿态改变而变化,这与真实环境下的听觉效果不同.本文通过将人体姿态变化转化为虚拟音源的位置变化,利用HRTF函数重建音频的虚拟声像,实现对耳机姿态感知的音频反馈.另一方面结合空间声场的特点对音频进行特定空间声场渲染,最终实现通过耳机播放音频实现空间音频的头部追踪效果,使用户获得更好的沉浸感... 相似文献
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本文利用波导不变性概念对Bartlett匹配场处理器距离-频率模糊度表面上旁瓣轨迹所包含的声源位置信息进行了理论分析,并结合计算机仿真以及某次海试数据进行了旁瓣结构定位技术的验证.浅水波导中,波导不变量β能够表征声场中干涉图像和色散特性这类最重要的声场相干特征,并可以反演声源的位置信息.Bartlett匹配场处理器距离-频率模糊度表面上呈现出的若干条连续的旁瓣结构是波导不变性特征的直接表现.仿真研究和海试数据分析表明,利用旁瓣结构进行声源定位较之利用主瓣结构进行声源定位具有更好的宽容性. 相似文献
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随着目标声源级不断减小、环境噪声级不断增大,常规的基于单节点的被动定位方式已经不能满足声纳探测的需求,因此提出一种新的将网络化探测系统和模基处理技术相结合的被动定位方法,可以从空间不同角度对目标进行观察并充分利用环境声场的复杂性对目标进行定位。模基处理方法主要有匹配场处理、匹配模处理等,以匹配场处理为例进行分析,将常规波束形成(Conventional Beamforming, CBF)、自适应波束形成(Minimum Variance Distortionless Response, MVDR)两种匹配场处理器和阵间相干、非相干信号处理方法相结合进行仿真,对单阵和多阵、MVDR和CBF、相干处理和非相干处理、宽带和窄带之间的定位性能进行了对比。仿真结果显示,基于多节点的阵间模基相干处理方式在定位性能上明显优于单节点的模基处理结果。 相似文献
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Moore BC 《Philosophical transactions. Series A, Mathematical, physical, and engineering sciences》2002,360(1794):833-858
This paper reviews interference effects in the auditory system, particularly effects occurring in the outer ear and the inner ear (cochlea). Sounds enter the ear canal both directly and after reflections from the pinna. This results in complex spectral patterns, which vary systematically with the direction of incidence of the sound source relative to the head. Evidence is described indicating that these spectral patterns are used in the localization of sounds in space. The cochlea behaves like a limited-resolution frequency analyser. When the components of a complex sound are closely spaced in frequency, they can interfere on the basilar membrane (BM) within the cochlea. Interference effects on the BM are complex, as they are influenced by a physiologically active mechanism which introduces strong nonlinearities, including level-dependent amplification. Interference effects on the BM play a role in many aspects of auditory perception, including the perception of consonance and dissonance, the perception of pitch, the perception of changes in phase, and the perception of timbre. Interference effects in the cochlea may also play a role in producing the spectral regularity observed in sounds reflected from the ear (otoacoustic emissions). 相似文献
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Jie Huang Ohnishi N. Sugie N. 《IEEE transactions on instrumentation and measurement》1995,44(3):733-738
This paper presents a system for sound source localization and separation inspired by the auditory mechanisms of biological systems. The system consists of three omni-directional microphones, banks of band-pass filters, and a personal computer with a digital signal processor. Sound sources are localized using arrival temporal disparities. The zero-crossing method is used to quickly detect the arrival temporal disparities at signal onset to cope with echo. Arrival temporal disparity histograms remove ambiguity and improve accuracy. The Histogram Mapping Method is introduced to localize multiple sound sources. The system separates multiple sound sources by obtaining their direction information from the localization process. Localization and separation experiments were conducted in an anechoic chamber and an empty room. Two sound sources, human voices, were used. Directions of the sound sources were localized within a few degrees. Sound sources were separated by 25 dB attenuation 相似文献
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针对三维多重信号分类(Multiple Signal Classification,MUSIC)算法估计声源位置时计算速度慢,计算量大等缺点,提出了一种基于鸡群优化(Chicken Swarm Optimization,CSO)算法的近场声源三维定位算法。首先建立近场声源信号接收的数学模型,并选取三维MUSIC算法中的空间谱函数为文章算法中的适应度函数。通过不断迭代和局部搜索,以适应度值为指标对鸡群个体进行排序,最终得到最优鸡群个体的位置,即近场待测声源的坐标。仿真和实验结果表明:文中算法具有定位精度高、计算效率高、实时性好等优点,文中算法的平均用时仿真时为三维MUSIC算法平均用时的1.9%,实验时为三维MUSIC算法用时的3.2%。 相似文献
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Evaluating the performance of BSBL methodology for EEG source localization on a realistic head model 下载免费PDF全文
Sajib Saha Rajib Rana Yakov Nesterets Murat Tahtali Frank de Hoog Timur Gureyev 《International journal of imaging systems and technology》2017,27(1):46-56
In this paper, we evaluate the performance of block sparse Bayesian learning (BSBL) method for EEG source localization. By exploiting the internal block structure, the BSBL method solves the ill‐posed inverse problem more efficiently than other methods that do not consider block structure. Simulation experiments were conducted on a realistic head model obtained by segmentation of MRI images of the head. Two definitions of blocks were considered: Brodmann areas and automated anatomical labeling (AAL). The experiments were performed both with and without the presence of noise. Six different noise levels were considered having SNR values from 5 dB to 30 dB with 5dB increment. The evaluation reveals several potential findings—first, BSBL is more likely to produce better source localization than sparse Bayesian learning (SBL), however, this is true up until a limited number of simultaneously active areas only. Experimental results show that for 71‐channel electrodes setup BSBL outperforms SBL for up to three simultaneously active blocks. From four simultaneously active blocks SBL turns out to be marginally better and the difference between them is statistically insignificant. Second, different anatomical block structures such as Brodmann areas or AAL does not seem to produce any significant difference in EEG source localization relying on BSBL. Third, even when the block partitions are not known exactly BSBL ensures better localization than SBL as soon as block structure persists in the signal. © 2017 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 27, 46–56, 2017 相似文献
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针对到达时间差(Time Difference of Arrival,TDOA)体制下海上声源定位测量问题,研究了Chan算法在定位测量中的应用。建立了基于TDOA体制的海上声源被动定位模型,推导了Chan算法求解TDOA定位方程的步骤,采用了蒙特卡洛数值方法对Chan算法与初始值选择真值的泰勒(Taylor)级数展开法在不同阵元数条件下的定位精度进行了比较,得出了Chan算法在海上声源定位测量中应用条件及基阵布设原则。仿真结果表明,在一定条件下,Chan算法可应用于海上声源定位测量且定位精度较高,研究结果可为海上声源测量系统定位算法设计及基站布设提供参考依据。 相似文献
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利用声压幅度比模型,提出了一种基于声压幅度比的多声源分离定位方法,该方法利用盲信号分离算法实现混合声源信号的分离,根据谱估计的相似度确定接收信号中各声源的分配情况,结合幅度差异因子获得传感器的声源信号分布,再通过单声源的声压幅度比模型确定声源位置,实现多声源定位。由于盲信号分离算法比较成熟,且实际中的声源信号大多为非高斯,因而满足盲信号分离条件。该方法具有实用强、应用性广等特点,对其它分离、定位问题也有借鉴作用。 相似文献