针对前馈管道非线性有源噪声控制系统,提出一种基于通用切比雪夫滤波器的次级通道建模方法和通用切比雪夫滤波x最小均方误差算法(GCFXLMS,general Chebyshev filtered-x least mean square)。通用切比雪夫滤波器由第一类切比雪夫滤波器...针对前馈管道非线性有源噪声控制系统,提出一种基于通用切比雪夫滤波器的次级通道建模方法和通用切比雪夫滤波x最小均方误差算法(GCFXLMS,general Chebyshev filtered-x least mean square)。通用切比雪夫滤波器由第一类切比雪夫滤波器扩展获得,交叉项部分可通过对角结构实现,根据对角结构的性质,可以采用减少通道信号的实现策略以降低结构复杂度;使用该滤波结构建模次级通道,并给出了稀疏虚拟次级通道模型,基于此模型推导了GCFXLMS算法。该方法性能比较包括计算复杂度对比和控制效果对比。实验结果表明,在非线性有源噪声控制系统中,通用切比雪夫滤波器可达到与Volterra次级通道建模类似的建模效果,相比于传统的前馈滤波器,通用切比雪夫滤波器具有更优的控制性能。展开更多
针对非线性有源噪声控制,提出一种基于通用勒让德滤波器及其对应的滤波x最小均方误差算法(General Legendre Filtered-X Least Mean Square,GLFXLMS)。通用勒让德滤波器具有正交性,可在[-1,1]区间逼近任何因果、时不变、有限记忆、连续...针对非线性有源噪声控制,提出一种基于通用勒让德滤波器及其对应的滤波x最小均方误差算法(General Legendre Filtered-X Least Mean Square,GLFXLMS)。通用勒让德滤波器具有正交性,可在[-1,1]区间逼近任何因果、时不变、有限记忆、连续、非线性系统。基于滤波X最小均方(Filtered-X Least Mean Square,FXLMS)算法架构推导通用勒让德滤波器对应的自适应GLFXLMS算法,并分析该算法的计算量,完成该方法与其他方法在不同非线性条件下的控制效果对比。实验结果表明,对于不同的非线性有源噪声控制模型,所提算法控制效果良好。展开更多
A 3rd-order Butterworth active-RC complex band-pass filter was presented for Zig Bee(IEEE802.15.4) transceiver applications. The filter adopted cascaded complex pole stages to realize the 3 MHz bandwidth with a centre...A 3rd-order Butterworth active-RC complex band-pass filter was presented for Zig Bee(IEEE802.15.4) transceiver applications. The filter adopted cascaded complex pole stages to realize the 3 MHz bandwidth with a centre frequency of 2 MHz which was required by the Zig Bee transceiver applications. An automatic frequency tuning scheme was also designed to accommodate the performance deterioration due to the process, voltage and temperature(PVT) variations. The whole filter is implemented in a 0.18 μm standard process and occupies an area of 1.3 mm×0.6 mm. The current dissipation is 1.2 m A from a 1.8 V single power supply. Measurement results show that the image rejection ratio(IRR) of the filter is 24.1 d B with a pass-band ripple less than 0.3 d B. The adjacent channel rejection is 29.8 d B@7 MHz and alternate channel rejection 47.5 d B@12 MHz, respectively.展开更多
文摘针对前馈管道非线性有源噪声控制系统,提出一种基于通用切比雪夫滤波器的次级通道建模方法和通用切比雪夫滤波x最小均方误差算法(GCFXLMS,general Chebyshev filtered-x least mean square)。通用切比雪夫滤波器由第一类切比雪夫滤波器扩展获得,交叉项部分可通过对角结构实现,根据对角结构的性质,可以采用减少通道信号的实现策略以降低结构复杂度;使用该滤波结构建模次级通道,并给出了稀疏虚拟次级通道模型,基于此模型推导了GCFXLMS算法。该方法性能比较包括计算复杂度对比和控制效果对比。实验结果表明,在非线性有源噪声控制系统中,通用切比雪夫滤波器可达到与Volterra次级通道建模类似的建模效果,相比于传统的前馈滤波器,通用切比雪夫滤波器具有更优的控制性能。
文摘针对非线性有源噪声控制,提出一种基于通用勒让德滤波器及其对应的滤波x最小均方误差算法(General Legendre Filtered-X Least Mean Square,GLFXLMS)。通用勒让德滤波器具有正交性,可在[-1,1]区间逼近任何因果、时不变、有限记忆、连续、非线性系统。基于滤波X最小均方(Filtered-X Least Mean Square,FXLMS)算法架构推导通用勒让德滤波器对应的自适应GLFXLMS算法,并分析该算法的计算量,完成该方法与其他方法在不同非线性条件下的控制效果对比。实验结果表明,对于不同的非线性有源噪声控制模型,所提算法控制效果良好。
基金Projects(61334003,61274026) supported by the National Natural Science Foundation of ChinaProject(K5051225006) supported by the Fundamental Research Fund for the Central Universities,China
文摘A 3rd-order Butterworth active-RC complex band-pass filter was presented for Zig Bee(IEEE802.15.4) transceiver applications. The filter adopted cascaded complex pole stages to realize the 3 MHz bandwidth with a centre frequency of 2 MHz which was required by the Zig Bee transceiver applications. An automatic frequency tuning scheme was also designed to accommodate the performance deterioration due to the process, voltage and temperature(PVT) variations. The whole filter is implemented in a 0.18 μm standard process and occupies an area of 1.3 mm×0.6 mm. The current dissipation is 1.2 m A from a 1.8 V single power supply. Measurement results show that the image rejection ratio(IRR) of the filter is 24.1 d B with a pass-band ripple less than 0.3 d B. The adjacent channel rejection is 29.8 d B@7 MHz and alternate channel rejection 47.5 d B@12 MHz, respectively.
