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降采样固定时延估算法在声回波对消系统中的应用 被引量:4
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作者 王心一 杜光 《山东大学学报(工学版)》 CAS 北大核心 2011年第3期42-45,共4页
提出一种基于降采样的固定时延估计算法,该算法在进行时延估计之前先对语音信号进行白噪声化和降采样,有效抑制互相关函数中的局部极大值旁瓣,克服了传统归一化互相关函数时延估计算法应用于声学回波对消系统中时估计误差大、鲁棒性差... 提出一种基于降采样的固定时延估计算法,该算法在进行时延估计之前先对语音信号进行白噪声化和降采样,有效抑制互相关函数中的局部极大值旁瓣,克服了传统归一化互相关函数时延估计算法应用于声学回波对消系统中时估计误差大、鲁棒性差的问题;并以基于降采样的固定时延估算法为基础,设计实现声学回波抵消系统。计算机仿真结果证明:该算法运算量低、收敛速度快、性能稳定。 展开更多
关键词 语音信号处理 回波对消 固定时延估计 降采样滤波器 归一化互相关
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RISK-SENSITIVE FIXED-POINT SMOOTHING ESTIMATION FOR LINEAR DISCRETE-TIME SYSTEMS WITH MULTIPLE OUTPUT DELAYS 被引量:1
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作者 ZHAO Hongguo CUI Peng 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2013年第2期137-150,共14页
This paper investigates the risk-sensitive fixed-point smoothing estimation for hnear omcrete-time systems with multiple time-delay measurements. The problem considered can be converted into an optimization one in ind... This paper investigates the risk-sensitive fixed-point smoothing estimation for hnear omcrete-time systems with multiple time-delay measurements. The problem considered can be converted into an optimization one in indefinite space. Then the risk-sensitive fixed-point smoother is obtained by solving the optimization problem via innovation analysis theory in indefinite space. Necessary and sufficient conditions guaranteeing the existence of the risk-sensitive smoother are also given when the risk-sensitive parameter is negative. Compared with the conventional approach, a significant advantage of presented approach is that it provides less computational cost. 展开更多
关键词 Innovation Riccati equation risk-sensitive time-delay.
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