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Experimental analysis of considering the sound pressure distribution pattern at the ear canal entrance as an unrevealed head-related localization clue

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Chinese Journal of Acoustics 2018年第1期37卷 110-128页

作者： TONG Xin QI Na meng zihou Communication Acoustics Laboratory Communication University of China

By analyzing the differences between binaural recording and real listening, it was deduced that there were some unrevealed auditory localization clues, and the sound pressure distribution pattern at the entrance of ear canal was probably a clue. It was proved through the listening test that the unrevealed auditory localization clues really exist with the reduction to absurdity. And the effective frequency bands of the unrevealed localization clues were in- duced and summed. The result of finite element based simulations showed that the pressure distribution at the entrance of ear canal was non-uniform, and the pattern was related to the direction of sound source. And it was proved that the sound pressure distribution pattern at the entrance of the ear canal carried the sound source direction information and could be used as an unrevealed localization clue. The frequency bands in which the sound pressure distribution patterns had significant differences between front and back sound source directions were roughly matched with the effective frequency bands of unrevealed localization clues obtained from the listening tests. To some extent, it supports the pattern could be a kind of unrevealed auditory hypothesis that the sound pressure distribution localization clues.

关键词： Experimental analysis of considering the sound pressure distribution pattern at the ear canal entrance as an unrevealed head-related localization clue

The influence of dummy head on measuring speech intelligibility

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Chinese Journal of Acoustics 2016年第2期35卷 178-192页

作者： ZHANG Siyu ZHENG Xiaolin meng zihou Communication Acoustics Laboratory Communication University of China

In order to investigate the influence of dummy head on measuring speech intelligi- bility, the objective and subjective speech intelligibility evaluation experiments were respectively carried out for different spatial configurations of a target source and a noise source in the horizontal plane. The differences between standard STIPA measured without a dummy head and binaural STIPA measured with a dummy head were compared and the correlation of subjective speech intelligibility and objective STIPA was analyzed. It is showed that the position of sound source affects significantly on binaural STIPA and subjective intelligibility measured by a dummy head or measured in a real-life scenario. The standard STIPA is closer to the lower value of the two binaural STIPA values. The speech intelligibility is higher for a single ear which is on the same side with the target source or on the other side of the noise source. Binaural speech intelligibility is always the lowest when both target and noise sources are at the same place but once apart the speech intelligibility will increase sharply. It is also found that the subjective intelligibility measured by a dummy head or measured in a real-life scenario is uncorrelated with standard STIPA, but correlated highly with STIPA measured with a dummy head. The subjective intelligibility of one single ear is correlated highly with STIPA measured at the same ear, and the binaural speech intelligibility is in well agreement with the higher value of the two binaural STIPA values.

关键词： head The influence of dummy head on measuring speech intelligibility

Statistical survey of female monophthong formants in Chinese Putonghua

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Chinese Journal of Acoustics 2006年第4期25卷 342-347页

作者： meng zihou Communication Acoustics Laboratory Communication University of China Beijing 100024

In order to investigate the group characteristics of Putonghua monophthong formants, the tokens of 90 female students were surveyed. The formants were measured using LPC method. The averaged values and spread of formant frequencies were given with statistical meaning. The results show the difference from the previous measurements by other researchers decades ago. For all monophthongs, F4/F3 and F5/F4 are generally around 1.4. To discriminate monophthongs, F2/F1 and F3/F2 are possibly the two new parameters besides the first three formants.

关键词： Statistical survey of female monophthong formants in Chinese Putonghua

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普通话单元音女声共振峰统计特性测量

声学学报 2006年第3期31卷 199-202页

作者：孟子厚中国传媒大学传播声学研究所北京100024

为了在群体意义上研究普通话单元音共振峰的特征,对90个女生的普通话单元音共振峰做了测量。共振峰的测量采用 LPC法,给出了具有统计意义的前五个共振峰的平均值和散布。对所测结果的观察发现统计测量的结果与前人的测量结果有明显的差... 详细信息

为了在群体意义上研究普通话单元音共振峰的特征,对90个女生的普通话单元音共振峰做了测量。共振峰的测量采用 LPC法,给出了具有统计意义的前五个共振峰的平均值和散布。对所测结果的观察发现统计测量的结果与前人的测量结果有明显的差别。所有单元音的F4／F3和F5／F4基本上都处于1．4附近;除了常用的最低的三个共振峰外,F2／F1、F3／F2 可能会给单元音的细节辨识提供两个新的特征参量。

关键词：特性测量统计意义共振峰元音话单特征参量 LPC 平均值 F2

Study of just noticeable difference of the reverberance with Chinese instrumental music

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Chinese Journal of Acoustics 2010年第2期29卷 199-208页

作者： ZHAO Fengjie meng zihou SHENG Shengwo Institute of Acoustics Tongji University Shanghai 200092 Communication Acoustics Laboratory in Communication University of China Beijing 100024

The just noticeable difference （JND） of the reverberance was tested using the constant-stimulus, method. Some factors that may influence the tested results are analyzed to validate the experimental data. The test materials are the Chinese instrumental music. Three subjects groups were tested, including the audio technician group, the students from audio engineering department and a group of postgraduates majoring in acoustics. It is found that the value of JND of reverberance is about 25%. The difference possibly caused by the professional training and experience of different subjects groups is noticeable, but the difference caused by different music motifs is insignificant.

关键词： JND Study of just noticeable difference of the reverberance with Chinese instrumental music test

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动态乐音谐波调制的听感谐和性分析

声学技术 2023年第3期42卷 326-330页

作者：郭天艺孟子厚中国传媒大学传播声学研究所北京100024

使用正弦加剩余噪声模型对不同乐器的乐音信号进行动态谐波调制,通过主观评价实验对不同调制模式下乐音的谐和感、粗糙感、自然感、尖锐感四项听感指标进行对比打分。结果表明,谐波调制所带来的谐和相关听感的影响以及合奏的协和感变化... 详细信息

使用正弦加剩余噪声模型对不同乐器的乐音信号进行动态谐波调制,通过主观评价实验对不同调制模式下乐音的谐和感、粗糙感、自然感、尖锐感四项听感指标进行对比打分。结果表明,谐波调制所带来的谐和相关听感的影响以及合奏的协和感变化,在不同音色类型中具有一致性,谐和听感结果与调制方式有关。

关键词：谐和性主观听感谐波调制正弦模型

A vertical track nonlinear energy sink

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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 931-946页

作者： meng LI Hu DING Shanghai Key Laboratory of Mechanics in Energy Engineering School of Mechanics and Engineering ScienceShanghai Frontier Science Center of MechanoinformaticsShanghai UniversityShanghai 200444China

Eliminating the effects of gravity and designing nonlinear energy sinks(NESs)that suppress vibration in the vertical direction is a challenging task with numerous damping *** this paper,the dynamic design of a vertical track nonlinear energy sink(VTNES)with zero linear stiffness in the vertical direction is proposed and realized for the first *** motion differential equations of the VTNES coupled with a linear oscillator(LO)are *** the strong nonlinearity considered of the VTNES,the steady-state response of the system is analyzed with the harmonic balance method(HBM),and the accuracy of the HBM is verified *** this basis,the VTNES prototype is manufactured,and its nonlinear stiffness is *** damping effect and dynamic characteristics of the VTNES are studied theoretically and *** results show that the VTNES has better damping effects when strong modulation responses(SMRs)***,even for small-amplitude vibration,the VTNES also has a good vibration suppression *** sum up,in order to suppress the vertical vibration,an NES is designed and developed,which can suppress the vertical vibration within certain ranges of the resonance frequency and the vibration intensity.

关键词： track nonlinear energy sink(TNES) vertical direction gravity nonlinear stiffness harmonic balance method(HBM) vibration control

Nested Saturated Control of Uncertain Complex Cascade Systems Using Mixed Saturation Levels

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1163-1174页

作者： meng Li Zhigang Zeng Wuhan National Laboratory for Optoelectronics Wuhan 430074 School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhan 430074China School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhan 430074 Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China Wuhan 430074China

This study addresses the problem of global asymptotic stability for uncertain complex cascade systems composed of multiple integrator systems and non-strict feedforward nonlinear systems. To tackle the complexity inherent in such structures, a novel nested saturated control design is proposed that incorporates both constant saturation levels and state-dependent saturation levels. Specifically, a modified differentiable saturation function is proposed to facilitate the saturation reduction analysis of the uncertain complex cascade systems under the presence of mixed saturation levels. In addition, the design of modified differentiable saturation function will help to construct a hierarchical global convergence strategy to improve the robustness of control design scheme. Through calculation of relevant inequalities, time derivative of boundary surface and simple Lyapunov function,saturation reduction analysis and convergence analysis are carried out, and then a set of explicit parameter conditions are provided to ensure global asymptotic stability in the closed-loop systems. Finally, a simplified system of the mechanical model is presented to validate the effectiveness of the proposed method.

关键词： method saturation differentiable

Adaptive admittance tracking control for interactive robot with prescribed performance

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Journal of Systems Engineering and Electronics 2024年第2期35卷 444-450页

作者： meng Qingrui LIN Yan School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100190China College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

An adaptive control approach is presented in this paper for tracking desired trajectories in interactive manipulators. The controller design incorporates prescribed performance functions (PPFs) to improve dynamic performance. Notably, the performance of the output error is confined in an envelope characterized by exponential convergence, leading to convergence to zero. This feature ensures a prompt response from admittance control and establishes a reliable safety framework for interactions. Simulation results provide practical insights,demonstrating the viability of the control scheme proposed in this paper.

关键词： prescribed performance admittance control adaptive control robots