分区频域卡尔曼滤波(Partitioned block frequency domain Kalman filtering,PBFDKF)因其收敛速度快、稳态误差小的优势被应用在自适应滤波声反馈抑制(Adaptive feedback cancellation,AFC)。然而,当声反馈路径发生突变时,卡尔曼滤波会...分区频域卡尔曼滤波(Partitioned block frequency domain Kalman filtering,PBFDKF)因其收敛速度快、稳态误差小的优势被应用在自适应滤波声反馈抑制(Adaptive feedback cancellation,AFC)。然而,当声反馈路径发生突变时,卡尔曼滤波会进入锁死状态,难以再次跟踪。本文提出一种融合神经网络的卡尔曼滤波啸叫抑制状态检测算法(Kalman⁃filter⁃based AFC with state detection model,KFSD)。该系统将卡尔曼滤波声反馈抑制系统的传声器采集信号、残差信号和滤波器更新量作为输入特征,通过神经网络对卡尔曼滤波的状态误差协方差矩阵进行修正,从而实现路径突变情况下的再次跟踪和收敛。仿真实验结果验证了所提算法具有较高的正判率、较低的虚警率和较短的延迟帧数,算法同时具备快速再跟踪性能,提高了声反馈抑制效果。展开更多
This paper mainly evaluated the walkability of the streets around the subway Futong Station in Wangjing area,and with the help of relevant theoretical research conclusions such as environmental behavioral psychology,t...This paper mainly evaluated the walkability of the streets around the subway Futong Station in Wangjing area,and with the help of relevant theoretical research conclusions such as environmental behavioral psychology,to study the effect of the visual walkability of streets in different communities on the walking activities of young male residents.Through in-depth analysis of the characteristics of streets that are suitable for walking and young male residents like to walk,practical and feasible reference suggestions were provided for the design of street public space and the establishment of a more livable urban environment.The text was divided into 3 parts:the determination of the functional types of the streets around Futong Station;the characteristics of young men's crowd activities and the establishment of an evaluation system;the visual walkability evaluation of the streets around Futong Station.展开更多
文摘分区频域卡尔曼滤波(Partitioned block frequency domain Kalman filtering,PBFDKF)因其收敛速度快、稳态误差小的优势被应用在自适应滤波声反馈抑制(Adaptive feedback cancellation,AFC)。然而,当声反馈路径发生突变时,卡尔曼滤波会进入锁死状态,难以再次跟踪。本文提出一种融合神经网络的卡尔曼滤波啸叫抑制状态检测算法(Kalman⁃filter⁃based AFC with state detection model,KFSD)。该系统将卡尔曼滤波声反馈抑制系统的传声器采集信号、残差信号和滤波器更新量作为输入特征,通过神经网络对卡尔曼滤波的状态误差协方差矩阵进行修正,从而实现路径突变情况下的再次跟踪和收敛。仿真实验结果验证了所提算法具有较高的正判率、较低的虚警率和较短的延迟帧数,算法同时具备快速再跟踪性能,提高了声反馈抑制效果。
基金Sponsored by 2022 Beijing Undergraduate Innovation and Entrepreneurship Training Plan,and Construction of an Exemplary off-campus Internship Base for the Integration of Industry and Education。
文摘This paper mainly evaluated the walkability of the streets around the subway Futong Station in Wangjing area,and with the help of relevant theoretical research conclusions such as environmental behavioral psychology,to study the effect of the visual walkability of streets in different communities on the walking activities of young male residents.Through in-depth analysis of the characteristics of streets that are suitable for walking and young male residents like to walk,practical and feasible reference suggestions were provided for the design of street public space and the establishment of a more livable urban environment.The text was divided into 3 parts:the determination of the functional types of the streets around Futong Station;the characteristics of young men's crowd activities and the establishment of an evaluation system;the visual walkability evaluation of the streets around Futong Station.
