听觉的空间感受及立体声信息监控

1.立体听觉听觉的空间感受能力,来自于方向听觉和距离听觉的综合效应。双耳对水平面信号的方向感知差异具有决定意义;对于垂直面的方向感和表现为与声入射角度相关的含有     

基于听觉模型的客观音质评价方法研究

本文阐述了一种基于听觉模型的客观音质评价方法研究,我们在使用谱失真和谱包络失真进行了客观音质评价同时采用了听觉系统模拟的三个听觉感知模型,实验结果表明,在于听觉模型的谱夫真方法测量结果与主观评价更人一致性,在与主观评价具有同样相关系数时,采用听觉模型谱包失真方法的预测系数为４阶而ＬＰＣ倒谱距离方法的预测系数为８阶。     

用户网络音频知识付费意愿的影响机制研究——基于感知价值的中介效应

音频媒介具有伴随和知识属性,在为用户带来良好收听体验的同时更加注重知识的传递,满足用户自我提升需求,进而提升用户付费意愿。本研究通过问卷调查法,选取401名有试听或收听线上音频付费产品经验的成年用户为研究对象,探究网络音频知识付费的影响因素和在影响过程中感知价值发挥的作用。研究表明,听觉体验、感知内容质量和感知有用性与用户的付费意愿成正比,且感知价值在听觉体验、感知内容质量、感知有用性与付费意愿之间起中介效用。     

视觉任务对听觉掩蔽效应影响的实验分析

视觉和听觉的交互作用是重要的感知心理现象,视觉和听觉同时做感知任务,可能会相互影响。在听觉掩蔽效应实验中,如果同时有视觉任务,听觉掩蔽效应可能会发生变化。变化的听觉掩蔽效应在应用中又可能对视频感知造成影响。设计了3组不同的视觉任务来观察这个问题,要求被试同时完成视觉和听觉系统给予的感知任务。结果发现,同时进行视觉任务,听觉掩蔽效应受到影响,并且视觉任务与听觉感知对象的相关性也表现出干扰效果。     

船舶噪声合成与听觉感知分析

船舶噪声人耳听觉感知训练是提高声呐员目标识别能力的重要手段,但是实录各类船舶在各个状态下的辐射噪声作为训练噪声样本根本无法实现,而且实录船舶辐射噪声易受环境噪声和海洋声信道传播的影响,无法清晰且不失真地呈现船舶的状态信息。依据人耳听觉感知的临界带通特性,提出了通过临界带通滤波和线谱迭加合成方法合成船舶辐射噪声的方法,并对舰船辐射噪声的原始声和合成声进行了听觉感知特性分析。研究结果表明辐射噪声的合成声与原始声在尖锐度、粗糙度和波动强度三个音色属性方面一致,可以作为船舶噪声人耳听觉感知训练中的噪声样本。     

一种新的听觉感知模型

本文根据心理声学的基本理论和实验资料,提出了一个基于听觉感知特征的听觉模型,与基于生理声学的听觉模型相比较,该模型更能反映人对连续自然语音的感知特性,因而适于对连续语音的识别。     

骨导超声听觉感知综述

通过骨导振动,人耳能够产生超声听觉感知,从而颠覆了人耳听不到超声的传统概念。对骨导超声感知研究领域国内外发展历程进行系统介绍,着重分析并探讨了三大研究热点:骨导感知的基本特点、人耳主观感知声以及感知机制的阐明,为后续的研究工作奠定了基础。     

一种新的听觉感知模型

本文根据心理声学的基本理论和实验资料，提出了一个基于听觉感知特征的听觉模型，与基一生理声学的听觉模型相比较，该模型更能反映人对连续自然语音的感知特性，因而适于对连续语音的识别。     

视觉信息对听觉定位的影响

人类对声源的空间定位是人的听觉系统的主要功能体现,人对声源定位判断的机理非常复杂。然而人类感知外界的信息,80％以上是通过视觉得到,人们很早就发现视觉信息对人耳听觉的定位有一定的影响。     

鼻辅音感知线索研究

语音识别系统的性能受许多因素的影响,如不同的说话人、说话方式、环境噪音等。为了提高系统的识别率和稳定性,一种重要的解决方法是寻找更好的、高强健性的基于人耳听觉感知特性的感知线索。基于此,三维深度研究方法（3DDS）被发明,用来探究语音信号在人耳内部的感知线索,并已成功的运用于对摩擦音和爆破音的感知线索识别。本文将这种方法拓展到鼻辅音的感知线索研究。在三个感知实验结果分析的基础上,定义了冗余感知线索和次要感知线索,并找到了/m/的感知线索是大约位于363~1250Hz的语音部分,/n/的感知线索是大约位于939~2826Hz的语音部分。      

Measurement and Analysis of Impulsive Noise from Bullet Trains

Measurements of impulsive noise radiating from bullet trains running either an upward or downward slope on the New Tokaido Line have been performed with the amplitude probability distribution-crossing rate distribution (APD-CRD) measuring apparatus using vertical dipole antennas. APD and CRD pairs have been simultaneously measured in a narrow bandwidth for some VHF. It is noted that APD's and CRD's change remarkably, depending on whether the bullet train runs an upward or downward slope. Generally, this effect is reduced to the following. These two distributions change remarkably, depending on whether the bullet train runs with or without current feeding the main motors of the vehicles. Models of the two categories of noise are presented; they lead to reasonable agreements between the measured and calculated CRD and/or ADP curves.     

异常检测模式性能评估技术研究

在对现有异常检测模式性能评估技术分析的基础上,给出一种基于理想异常检测临界值的异常检测模式性能评估方法,从而进一步增强了异常检测模式性能评估技术。     

Performance analysis of the approximate dynamic programmingalgorithm for parameter estimation of superimposed signals

We consider the classical problem of fitting a model composed of multiple superimposed signals to noisy data using the criteria of maximum likelihood (ML) or subspace fitting, jointly termed generalized subspace fitting (GSF). We analyze a previously proposed approximate dynamic programming algorithm (ADP), which provides a computationally efficient solution to the associated multidimensional multimodal optimization problem. We quantify the error introduced by the approximations in ADP and deviations from the key local interaction signal model (LISMO) modeling assumption in two ways. First, we upper bound the difference between the exact minimum of the GSF criterion and its value at the ADP estimate and compare the ADP with GSF estimates obtained by exhaustive multidimensional search on a fine lattice. Second, motivated by the similar accuracy bounds, we use perturbation analysis to derive approximate expressions for the MSE of the ADP estimates. These various results provide, for the first time, an effective tool to predict the performance of the ADP algorithm for various signal models at nonasymptotic conditions of interest in practical applications. In particular, they demonstrate that for the classical problems of sinusoid retrieval and array processing, ADP performs comparably to exact (but expensive) maximum likelihood (ML) over a wide range of signal-to-noise ratios (SNRs) and is therefore an attractive algorithm     

An efficient VLSI architecture design for logarithmic multiplication by using the improved operand decomposition

Over the last few years, the Logarithmic Number System (LNS) has played a pivotal and decisive role in the field of Digital Signal Processing (DSP) and Image processing. Multiplication is a ubiquitous thirsty area to perform arithmetic operations in DSP applications and researchers have found that LNS is the possible solution for multiplication to be performed for a DSP application. In this paper, we propose a novel approach based on the Improved Operand Decomposition (IOD) to make an efficient logarithmic multiplier and subsequent achievement through scale realization. The Pipeline technique and the efficient correction circuit are used for error minimization at the cost of minimal hardware and delay. Reported and proposed multiplier is evaluated and compared in terms of Data Arrival Time (DAT), area, power, Area Delay Product (ADP), and EPS (Energy per Sample) at 90 nm CMOS technology by using Synopsys Design Compiler. Simulation results show that the proposed IOD method for logarithmic multiplication without the pipelining gives maximum of 35.39% less ADP and 11.15% less EPS for 32-bit architecture than of the reported logarithmic multiplier architecture. The proposed IOD based logarithmic multiplier with the pipelining gives a maximum of 20.17% less ADP for 8-bit architecture and 21.72% for 32-bit architecture than of the reported iterative pipelined architecture of logarithmic multiplier. Simulation results show that the optimized logarithmic converter gives 7.32%, and optimized antilogarithmic converter gives 41.59% less ADP respectively than of the reported logarithmic and antilogarithmic converter structures. The optimized antilogarithmic converter architecture gives a maximum of 43.94% less EPS than of the reported antilogarithmic converter structure.     

信息优先级保护的动态频谱分配算法

为提高海上无人艇编队无线网络频谱利用率,同时满足不同优先级信息的传输需求,提出了一种信息优先级保护的动态频谱分配算法。算法采用完全信息动态博弈模型,引入异步分布式定价（Asynchronous Distributed Pricing,ADP）算法设计效用函数。鉴于传统ADP算法在有较多通信余量时干扰价格定价过高,改进干扰价格定义。为体现优先级对分配的影响,在效用函数中加入信息权重。对效用函数成本部分进一步更改,可在实现高优先级信息优先传输的同时,依据通信速率需求合理分配信道通信容量。经过仿真验证,所提算法在吞吐量和可靠性方面优于基于节点优先级的分配算法。     

Excess noise sources due to defects in forward biased junctions

In forward biased junctions crystallographic defects and impurities may be the cause of three different noise sources: (a) recombination noise, (b) flicker noise and (c) burst noise. Recombination noise is shown to be lower than the full shot noise of the recombination current and measurements at intermediate frequencies are shown to be very close to the theoretical value. For flicker noise at least two kinds of sources have been proposed: dislocations or surface traps. It is shown that the effects of dislocations on flicker noise can be explained by the surface model. Finally, the physical sources of burst noise are investigated. From statistical experiments carried out on several dozens of wafers it is concluded that crystallographic defects are the main source of burst noise.     

基于ADP1043的数字电源设计

介绍了ADI公司最近推出的全数字电源管理芯片ADPI043的特点,设计了基于此芯片的一个数字控制的带同步整流的全桥变换器,分析了主电路参数以及数字控制环路参数的设计,并给出了实验结果。     

抑制电子电路中空间干扰噪音的措施

在进行电子产品开发过程中,必然会遇到各种各样的噪音。为了揭示空间噪音的根源、传输途径及抑制方法.在实验中,反复采用系统接地和电磁屏蔽有效结合的手段,对电路信号中的空间噪音波形进行观察、比较与分析。实践中,使用这些措施去抑制电子产品的空间噪音,都达到了事半功倍的效果。     

Multi-frame super-resolution reconstruction based on mixed Poisson–Gaussian noise

In this paper, a non-blind multi-frame super-resolution (SR) model based on mixed Poisson–Gaussian noise (MPGSR) is proposed. Poisson noise arises from the stochastic nature of the photon-counting process. Readout noise and reset noise inherent to the readout circuitry can be modeled by an additive Gaussian noise. Therefore, a mixed Poisson–Gaussian noise model is more appropriate for real imaging system. Instead of deriving the data fidelity term from the perspective of error norms and the corresponding influence functions, we address the multi-frame SR problem based on a statistical noise model. The derived objective function is decomposed into sub-functions and solved by the alternating direction method of multipliers (ADMM) algorithm which allows using techniques of constrained optimization. The validation of the proposed MPGSR was performed quantitatively and qualitatively on natural and X-ray images. In comparison to the optimization-based and learning-based state-of-the-art methods, we have demonstrated the feasibility of MPGSR and the significance of applying a more appropriate noise model on the SR image reconstruction.     

A transient noise simulation model for the analysis of the optimal number of stages of the analog accumulator in TDI CMOS image sensors

In this paper, a fast transient noise simulation model is proposed to analyze the optimal number of stages for the maximum signal to noise ratio (SNR) of the analog accumulator in a fixed silicon area. The Transient Noise Simulation (TNS) is required to confirm the analysis of the optimal number of stages, which requires long simulation time. In order to accelerate our analysis, a fast transient noise simulation model (TNSM) is proposed based on the noise analysis and shown to be effective by TNS. Numerical analysis is verified by the TNSM, and it indicates that the optimal number of stages in a fixed area changes with the noise of the input signal.