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2016 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)最新文献

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Study on offset reduction method for a fully differential filter employing symmetrical floating impedance scaling circuits 采用对称浮动阻抗缩放电路的全差分滤波器的偏置减小方法研究
F. Matsumoto, Shota Matsuo, Syuzo Nishioka, H. Abe, T. Ohbuchi
In this paper, a method to reduce the offset voltage of a fully differential filter employing symmetry-type floating impedance scaling (SFIS) circuits with prevention of wasteful power consumption is proposed. The problem of the filter employing the conventional SFIS circuit and a common-mode rejection (CMR) circuit is that DC offset voltages are high. In order to reduce the offset voltages, much operating currents are necessary for high gain amplifier in the CMR circuit. The proposed solution is to reduce the offset voltage by unifying a common-mode feedback (CMFB) circuit and the SFIS circuit unlike an ordinary way that the CMFB is combined with an OTA or an OPamp. The validity of the proposed technique is examined by simulation. The offset voltage of the 1st-order fully differential active lowpass filter employing the proposed circuit is about 1.56mV. Comparing the current consumption of proposed and the conventional SFIS circuits, the proposed one is reduced by 35.5%.
本文提出了一种利用对称型浮动阻抗缩放(SFIS)电路降低全差分滤波器偏置电压的方法,同时防止了功耗的浪费。采用传统SFIS电路和共模抑制(CMR)电路的滤波器的问题是直流偏置电压高。在CMR电路中,为了降低失调电压,高增益放大器需要大量的工作电流。提出的解决方案是通过统一共模反馈(CMFB)电路和SFIS电路来降低失调电压,而不是将CMFB与OTA或OPamp相结合的普通方式。通过仿真验证了该方法的有效性。采用该电路的一阶全差分有源低通滤波器的失调电压约为1.56mV。与传统的SFIS电路相比,该电路的电流消耗降低了35.5%。
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引用次数: 1
Processing time reduction of tone mapping based on iterative shrinkage smoothing using parallel processing 基于迭代收缩平滑并行处理的色调映射处理时间缩短
Seijiro Imai, Dabwitso Kasauka, Hiroshi Tsutsui, Takashi Imagawa, H. Okuhata, Y. Miyanaga
Iterative shrinkage smoothing algorithm can perform image smoothing with eliminating fine details and preserving principal edges in an image. However, real time processing is difficult due to large processing time when input image size is large. By utilizing downscaled image of an input image, the processing time can be dramatically reduced. In this case, however, the information of preserved principal edges is not accurate. Considering the applications utilizing such edge preserving smoothing algorithms, such as image tone mapping and detail enhancement, inaccurate principal edge information degrades the quality of resulted images. In this paper, we focus on tone mapping in the applications and propose processing time reduction method of tone mapping based on iterative shrinkage smoothing by utilizing parallel processing. Experimental results show that the proposed method improves the frame rates to 16 and 10 times for VGA and full HD resolutions, respectively, compared to single process implementation.
迭代收缩平滑算法可以消除图像中的细微细节并保持图像的主要边缘。然而,当输入图像尺寸较大时,处理时间较长,给实时处理带来困难。通过利用输入图像的缩小图像,可以大大减少处理时间。然而,在这种情况下,保留的主边信息是不准确的。考虑到使用这种边缘保持平滑算法的应用,如图像色调映射和细节增强,不准确的主边缘信息会降低结果图像的质量。本文针对色调映射中的应用,提出了一种基于迭代收缩平滑的并行处理方法来减少色调映射的处理时间。实验结果表明,与单进程实现相比,该方法在VGA和全高清分辨率下的帧率分别提高了16倍和10倍。
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引用次数: 0
Development of stance correction system for billiard beginner player 台球初学者姿态校正系统的研制
M. Mishima, A. Suganuma
The billiard is necessary to acquire proper stance. If the player hit the ball in irregular stance, he or she would occur that mishits or the ball does not roll to the aimed place. Learning and using proper stance is the most critical aspect of a person's early billiard career. Thereby, we have been developing stance correction system. When the rear elbow is a right angle or the forward arm stretches, that stance is correct. Therefore, this system captures the player using the Kinect, and compares the angle of rear elbow and forward shoulder with thresholds. Using this system, the beginner can enjoy if he or she participates in the game.
台球是获得正确站位的必要条件。如果球员以不规则的姿势击球,他或她就会出现失误或球没有滚到目标位置。学习和使用正确的站位是一个人早期台球生涯中最关键的方面。因此,我们一直在开发姿态校正系统。当后肘成直角或前臂伸展时,这个姿势是正确的。因此,该系统捕捉使用Kinect的玩家,并将后肘和前肩的角度与阈值进行比较。使用这个系统,初学者可以享受如果他或她参与游戏。
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引用次数: 2
Threshold decision for rank adaptation based on cumulative channel capacity 基于信道累积容量的等级自适应阈值决策
Kazuki Aono, N. Sasaoka, Y. Itoh
The channel capacity is improved by MIMO (Multiple Input Multiple Output) increasing the number of transmit and receive antennas. However, it is difficult for a receiver to decode symbols when the rank of a MIMO channel is less than the number of transmitted antennas. Thus, rank adaptation has been proposed to control the number of transmitted streams in accordance with propagation environments. Conventional rank adaptation degrades the performance of controlling the number of streams in an unanticipated channel environment. Therefore, we proposed the rank adaptation using cumulative channel capacity. Although the rank adaptation has potential to improve the channel capacity, the performance depends on the threshold, which is used to change the number of streams. Therefore, threshold decision, which is robust to varying channel environments, is introduced into the rank adaptation based on cumulative channel capacity in this paper.
通过MIMO(多输入多输出)增加发射和接收天线的数量来提高信道容量。然而,当MIMO信道的秩小于发射天线的数量时,接收器解码符号是困难的。因此,提出了等级自适应,根据传播环境控制传输流的数量。传统的秩自适应降低了在非预期信道环境中控制流数量的性能。因此,我们提出了基于信道累积容量的秩自适应算法。虽然秩自适应有可能提高信道容量,但性能取决于阈值,该阈值用于改变流的数量。因此,本文在基于信道累积容量的秩自适应中引入了对不同信道环境具有鲁棒性的阈值决策。
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引用次数: 1
Correlation based active regions identification from fMRI data 基于fMRI数据关联的活动区识别
Nattapol Aunsri, Waralak Chongdarakul
The studies of neuroimaging have been shown that odorant-induced responses to the prolonged stimulation in primary olfactory cortex (POC) are characterized by a rapidly habituating time course. This paper is concerned the identification of the active regions in the brain after that stimulation. The correlation technique is used to obtain the quantity that could be a parameter to exhibit the regions of interest. This paper also illustrates the ways to remedy problems that occurred during data acquisition process. The real functional magnetic resonance imaging (fMRI) data obtained from the experiment is used to evaluate the performance of the method.
神经影像学研究表明,气味诱导的初级嗅皮质(POC)对长时间刺激的反应具有快速适应的时间过程。本文关注的是这种刺激后大脑活动区域的识别。使用相关技术来获得可以作为显示感兴趣区域的参数的数量。本文还阐述了在数据采集过程中出现的问题的补救方法。实验中获得的真实功能磁共振成像(fMRI)数据用于评价该方法的性能。
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引用次数: 1
Blind signal separation based on band division using QMF Bank 基于QMF库分带的盲信号分离
Kazuaki Matsushima, H. Matsumoto
Blind signal separation method is the method that the source signals are obtained by separating only the mixed signals. Generally, separation precision is lower when the basic method of blind signal separation is used for the sound signals. It is the cause that the power of the sound signals is concentrated in the low-frequency band. For the problem, we already considered that the method of the blind signal separation using QMF. Specifically, the mixed signals are divided into two frequency bands, and we perform suitable separation for each two bands. As the result, the conventional method has higher separation precision than the basic method. However, in the low-frequency band, power spectrum is not constant for frequency. Therefore, it is expected that the separation precision is higher than the conventional method by performing the suitable separation for each of signals based on the division to several narrow frequency bands on the low-frequency band. Then, in this paper, we propose the method that has higher separation precision and we evaluate the proposed method by computer simulation.
盲信号分离方法是通过只分离混合信号来获得源信号的方法。一般情况下,对声信号采用盲信号分离的基本方法,分离精度较低。这是声信号的功率集中在低频段的原因。针对这个问题,我们已经考虑了利用QMF进行盲信号分离的方法。具体来说,我们将混合信号分为两个频段,并对每个频段进行适当的分离。结果表明,常规方法比基本方法具有更高的分离精度。然而,在低频频段,功率谱对于频率来说是不恒定的。因此,通过在低频段上划分为几个窄频带,对每个信号进行适当的分离,期望比传统方法的分离精度更高。在此基础上,提出了一种具有较高分离精度的方法,并通过计算机仿真对该方法进行了评价。
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引用次数: 0
A self-sustaining unmanned aerial vehicle routing protocol for smart farming 一种用于智能农业的自维持无人机路由协议
Prusayon Nintanavongsa, Weerachai Yaemvachi, Itarun Pitimon
Increasing agricultural productivity has been a long quest for farmers and only a few can achieve it. One major factor that hinders them to achieve such goal is the lack of proper agricultural monitoring technique. Recent advancement in technology has enabled the integration of sensor networks and traditional farming, resulting in effective monitoring through smart farming. However, there exists a hefty investment in equipment and infrastructure installation throughout the coverage area. We design two routing approaches, called Location-agnostic (LA) and Location-specific (LS) protocols, to facilitate the self-sustaining agricultural monitoring platform, requiring no infrastructure installation, comprises of Unmanned Aerial Vehicle (UAV) with solar energy harvesting and wireless power transfer capability. The LA protocol does not require location information of monitoring stations to be visited prior to the flight, and is useful for dynamic environment. The LS protocol relies on the complete view of the topology prior to the flight and is suitable for static environment. These protocols determine the optimal UAV routing path from a set of monitoring stations under various conditions. Through a combination of simulation and experimentation studies, we demonstrate significant energy efficiency and coverage area improvement over the classical routing protocol.
提高农业生产力是农民长期追求的目标,但只有少数人能做到。阻碍他们实现这一目标的一个主要因素是缺乏适当的农业监测技术。最近的技术进步使传感器网络与传统农业相结合,从而通过智能农业实现有效的监测。然而,在整个覆盖范围内,在设备和基础设施安装方面存在着巨额投资。我们设计了两种路由方法,称为位置不可知(LA)和位置特定(LS)协议,以促进自给自足的农业监测平台,不需要安装基础设施,包括具有太阳能收集和无线电力传输能力的无人机(UAV)。LA协议不需要在飞行前访问监测站的位置信息,对于动态环境非常有用。LS协议依赖于飞行前的完整拓扑视图,适用于静态环境。这些协议确定了一组监测站在各种条件下的最优无人机路由路径。通过仿真和实验研究的结合,我们证明了与经典路由协议相比,该协议的能源效率和覆盖面积有显著提高。
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引用次数: 8
Valiable frequency characteristics multi-channel on-chip patch-clamp system using 0.18 um CMOS technology 采用0.18 um CMOS技术的可靠频率特性多通道片上膜片钳系统
M. Kubo, T. Kosaka, Takanori Miyawaki, K. Ito, N. Nakano
Patch-clamp measurement system is one of the useful techniques in the field of Electrophysiology. This technique makes it possible to measure ion current and is expected to contribution of the treatment of neurological disease and elucidation of the neuronal activity. In this paper, we propose multi-channel patch-clamp measurement system. The system is composed of I–V converter, parasitic components compensation circuit, programmable gain amplifier, anti-aliasing filter, multiplexer, and serial to parallel converter. The current-to-voltage conversion rate of the whole system is a maximum 379 Gohm. The input referred current noise is achieved 1.86 pArms in simulation, 2.09 pArms in measurement. In order to fine tune the cutoff frequency of entire system, the variable capacitance is used for the filter. It is possible to eliminate the influence of variations between the channels in a multi-channel system. The system was fabricated using the 0.18um CMOS process. 8-channel system is implemented in a chip size of 2.5 mm times 5 mm.
膜片钳测量系统是电生理学领域中非常有用的技术之一。该技术使测量离子电流成为可能,有望对神经系统疾病的治疗和神经元活动的阐明作出贡献。本文提出了一种多通道膜片钳测量系统。该系统由I-V变换器、寄生元件补偿电路、可编程增益放大器、抗混叠滤波器、多路复用器和串并联变换器组成。整个系统的电流-电压转换率最大为379戈姆。仿真时输入参考电流噪声达到1.86 pArms,测量时达到2.09 pArms。为了对整个系统的截止频率进行微调,滤波器采用了可变电容。在多通道系统中,消除通道之间变化的影响是可能的。该系统采用0.18um CMOS工艺制备。8通道系统在2.5毫米乘以5毫米的芯片尺寸中实现。
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引用次数: 0
Verification of search process in CSD coefficient FIR filter design CSD系数FIR滤波器设计中搜索过程的验证
Tomohiro Sasahara, K. Suyama
In this research, several design methods of FIR (Finite Impulse Response) filters with CSD (Canonic Signed Digit) coefficient are compared to investigate a search process of each method. The design problem is formulated as a 1, 0, −1 combinatorial optimization problem. In this problem, high computation time is required to obtain the optimal solution. Thus, many design methods using metaheuristic approaches have been proposed. In this study, the search process of design methods is verified. As a result, the differences between the design methods are clarified and thus it is expected that some cues for improving the performance can be attained.
在本研究中,比较了几种具有经典符号数字(CSD)系数的FIR (Finite Impulse Response)滤波器的设计方法,研究了每种方法的搜索过程。设计问题被表述为一个1,0,−1组合优化问题。在该问题中,计算时间较长,难以得到最优解。因此,已经提出了许多使用元启发式方法的设计方法。在本研究中,验证了设计方法的搜索过程。因此,澄清了设计方法之间的差异,从而有望获得一些改进性能的线索。
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引用次数: 0
Cross-correlation functions with binary signal involving phase information for speech enhancement 包含相位信息的二值信号相互关函数用于语音增强
Kyohei Mitani, Yosuke Sugiura, T. Shimamura
In this paper, adding phase information to the cross-correlation function between speech signal and its binary signal, we propose a speech enhancement method in noisy environments. Methods to connect the auto-correlation function periodically or utilize exponentiated amplitude spectrum are known as a correlation function based approach for speech enhancement. In the conventional methods, spectral square distortion occurs. In the proposed method, by using the binary signal to calculate the cross-correlation function, it is possible to mitigate the influence of spectral square distortion. Experimental results show that the proposed method effectively works especially in non-stationary noise environments.
本文通过在语音信号与其二值信号的互相关函数中加入相位信息,提出了一种噪声环境下的语音增强方法。周期性连接自相关函数或利用指数化幅度谱的方法被称为基于相关函数的语音增强方法。在常规方法中,会产生谱方畸变。在该方法中,利用二值信号计算互相关函数,可以减轻谱方失真的影响。实验结果表明,该方法特别适用于非平稳噪声环境。
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引用次数: 1
期刊
2016 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)
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