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公开(公告)号：US08077767B2
公开(公告)日：2011-12-13
申请号：US12358993
申请日：2009-01-23
IPC分类号： H03H7/30
CPC分类号： H03H21/0067 , H03H21/0001 , H03H21/0012
摘要： An adaptive transversal filter having tap weights Wj which are products of corresponding tap coefficients Cj and tap gains Mj is provided. A filter control loop controls all of the tap coefficients Cj such that an error signal derived from the filter output is minimized. One or more tap control loops controls a tap gain Mk such that the corresponding tap coefficient Ck satisfies a predetermined control condition. For example, |Ck| can be maximized subject to a constraint |Ck|≦Cmax, where Cmax is a predetermined maximum coefficient value. In this manner, the effect of quantization noise on the coefficients Cj can be reduced. Multiple tap control loops can be employed, one for each tap. Alternatively, a single tap control loop can be used to control multiple taps by time interleaving.
摘要翻译： 提供具有作为对应抽头系数Cj和抽头增益Mj的乘积的抽头权重Wj的自适应横向滤波器。 滤波器控制环控制所有抽头系数Cj，使得从滤波器输出得到的误差信号最小化。 一个或多个抽头控制回路控制抽头增益Mk使得对应的抽头系数Ck满足预定的控制条件。 例如| Ck | 可以最大化受限于| Ck |＆nlE; Cmax，其中Cmax是预定的最大系数值。 以这种方式，可以减小量化噪声对系数Cj的影响。 可以采用多个抽头控制回路，每个抽头一个。 或者，可以使用单抽头控制回路来通过时间交织来控制多个抽头。
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公开(公告)号：US20090198755A1
公开(公告)日：2009-08-06
申请号：US12358993
申请日：2009-01-23
IPC分类号： G06F17/10
CPC分类号： H03H21/0067 , H03H21/0001 , H03H21/0012
摘要： An adaptive transversal filter having tap weights Wj which are products of corresponding tap coefficients Cj and tap gains Mj is provided. A filter control loop controls all of the tap coefficients Cj such that an error signal derived from the filter output is minimized. One or more tap control loops controls a tap gain Mk such that the corresponding tap coefficient Ck satisfies a predetermined control condition. For example, |Ck| can be maximized subject to a constraint |Ck|≦Cmax, where Cmax is a predetermined maximum coefficient value. In this manner, the effect of quantization noise on the coefficients Cj can be reduced. Multiple tap control loops can be employed, one for each tap. Alternatively, a single tap control loop can be used to control multiple taps by time interleaving.
摘要翻译： 提供具有作为对应抽头系数Cj和抽头增益Mj的乘积的抽头权重Wj的自适应横向滤波器。 滤波器控制环控制所有抽头系数Cj，使得从滤波器输出得到的误差信号最小化。 一个或多个抽头控制回路控制抽头增益Mk使得对应的抽头系数Ck满足预定的控制条件。 例如| Ck | 可以最大化受约束| Ck | <= Cmax，其中Cmax是预定的最大系数值。 以这种方式，可以减小量化噪声对系数Cj的影响。 可以采用多个抽头控制回路，每个抽头一个。 或者，可以使用单抽头控制回路来通过时间交织来控制多个抽头。
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公开(公告)号：US20120076195A1
公开(公告)日：2012-03-29
申请号：US13312273
申请日：2011-12-06
IPC分类号： H03H7/30
CPC分类号： H03H21/0067 , H03H21/0001 , H03H21/0012
摘要： An adaptive transversal filter having tap weights Wj which are products of corresponding tap coefficients Cj and tap gains Mj is provided. A filter control loop controls all of the tap coefficients Cj such that an error signal derived from the filter output is minimized. One or more tap control loops controls a tap gain Mk such that the corresponding tap coefficient Ck satisfies a predetermined control condition. For example, |Ck| can be maximized subject to a constraint |Ck| Cmax, where Cmax is a predetermined maximum coefficient value. In this manner, the effect of quantization noise on the coefficients Cj can be reduced. Multiple tap control loops can be employed, one for each tap. Alternatively, a single tap control loop can be used to control multiple taps by time interleaving.
摘要翻译： 提供具有作为对应抽头系数Cj和抽头增益Mj的乘积的抽头权重Wj的自适应横向滤波器。 滤波器控制环控制所有抽头系数Cj，使得从滤波器输出得到的误差信号最小化。 一个或多个抽头控制回路控制抽头增益Mk使得对应的抽头系数Ck满足预定的控制条件。 例如| Ck | 可以最大限度地受限于| Ck | Cmax，其中Cmax是预定的最大系数值。 以这种方式，可以减小量化噪声对系数Cj的影响。 可以采用多个抽头控制回路，每个抽头一个。 或者，可以使用单抽头控制回路来通过时间交织来控制多个抽头。
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公开(公告)号：US08959132B2
公开(公告)日：2015-02-17
申请号：US13619597
申请日：2012-09-14
CPC分类号： H04L47/6245 , G06F1/10 , H03L7/00 , H04B3/32 , H04J3/0697 , H04L25/0278 , H04L43/16 , H04L47/25 , H04L47/521 , H04L47/6215 , H04L47/722
摘要： A method of optimizing filter performance through monitoring channel characteristics is provided. A signal enters a channel and a receiver receives the signal. The receiver includes a FIR filter to remove near-end transmitted interference and recover a far-end desired signal. The filter has storage elements configured as a shift registers to move the signal, multipliers to multiply the signal by a filter coefficient, an intermittent summer to combine the multiplied results into a replica of an interfering signal, a final summer to remove the replica from the receiver signal to provide direct and indirect monitoring of the signal, where direct monitoring includes time or frequency monitoring, and indirect monitoring includes monitoring signal to noise ratio, error magnitude or bit error rate. The filter is optimized according to monitoring and includes reducing a dynamic range, reducing bits of precision, reducing linearity, the filter, and reallocating the filter.
摘要翻译： 提供了一种通过监控通道特性来优化滤波器性能的方法。 一个信号进入一个通道，一个接收器接收信号。 接收机包括用于去除近端传输干扰并恢复远端期望信号的FIR滤波器。 滤波器具有配置为移位寄存器的存储元件，用于移动信号，乘法器将信号乘以滤波器系数，间歇夏季，以将相乘的结果合并为干扰信号的复制品，最后一个夏季从 接收机信号提供对信号的直接和间接监测，其中直接监视包括时间或频率监测，间接监测包括监测信噪比，误差幅度或误码率。 滤波器根据监控进行优化，包括减少动态范围，降低精度，降低线性度，滤波器和重新分配滤波器。
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公开(公告)号：US20130013658A1
公开(公告)日：2013-01-10
申请号：US13619597
申请日：2012-09-14
IPC分类号： G06F17/10
CPC分类号： H04L47/6245 , G06F1/10 , H03L7/00 , H04B3/32 , H04J3/0697 , H04L25/0278 , H04L43/16 , H04L47/25 , H04L47/521 , H04L47/6215 , H04L47/722
摘要： A method of optimizing filter performance through monitoring channel characteristics is provided. A signal enters a channel and a receiver receives the signal. The receiver includes a FIR filter to remove near-end transmitted interference and recover a far-end desired signal. The filter has storage elements configured as a shift registers to move the signal, multipliers to multiply the signal by a filter coefficient, an intermittent summer to combine the multiplied results into a replica of an interfering signal, a final summer to remove the replica from the receiver signal to provide direct and indirect monitoring of the signal, where direct monitoring includes time or frequency monitoring, and indirect monitoring includes monitoring signal to noise ratio, error magnitude or bit error rate. The filter is optimized according to monitoring and includes reducing a dynamic range, reducing bits of precision, reducing linearity, the filter, and reallocating the filter.
摘要翻译： 提供了一种通过监控通道特性来优化滤波器性能的方法。 一个信号进入一个通道，一个接收器接收信号。 接收机包括用于去除近端传输干扰并恢复远端期望信号的FIR滤波器。 滤波器具有配置为移位寄存器的存储元件，用于移动信号，乘法器将信号乘以滤波器系数，间歇夏季，以将相乘的结果合并为干扰信号的复制品，最后一个夏季从 接收机信号提供对信号的直接和间接监测，其中直接监视包括时间或频率监测，间接监测包括监测信噪比，误差幅度或误码率。 滤波器根据监控进行优化，包括减少动态范围，降低精度，降低线性度，滤波器和重新分配滤波器。
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公开(公告)号：US08300686B2
公开(公告)日：2012-10-30
申请号：US13312273
申请日：2011-12-06
IPC分类号： H03H7/40
CPC分类号： H03H21/0067 , H03H21/0001 , H03H21/0012
摘要： An adaptive transversal filter having tap weights Wj which are products of corresponding tap coefficients Cj and tap gains Mj is provided. A filter control loop controls all of the tap coefficients Cj such that an error signal derived from the filter output is minimized. One or more tap control loops controls a tap gain Mk such that the corresponding tap coefficient Ck satisfies a predetermined control condition. For example, |Ck| can be maximized subject to a constraint |Ck| Cmax, where Cmax is a predetermined maximum coefficient value. In this manner, the effect of quantization noise on the coefficients Cj can be reduced. Multiple tap control loops can be employed, one for each tap. Alternatively, a single tap control loop can be used to control multiple taps by time interleaving.
摘要翻译： 提供具有作为对应抽头系数Cj和抽头增益Mj的乘积的抽头权重Wj的自适应横向滤波器。 滤波器控制环控制所有抽头系数Cj，使得从滤波器输出得到的误差信号最小化。 一个或多个抽头控制回路控制抽头增益Mk使得对应的抽头系数Ck满足预定的控制条件。 例如| Ck | 可以最大限度地受限于| Ck | Cmax，其中Cmax是预定的最大系数值。 以这种方式，可以减小量化噪声对系数Cj的影响。 可以采用多个抽头控制回路，每个抽头一个。 或者，可以使用单抽头控制回路来通过时间交织来控制多个抽头。
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公开(公告)号：US08296347B2
公开(公告)日：2012-10-23
申请号：US11981565
申请日：2007-10-30
IPC分类号： G06F17/10
CPC分类号： H04L47/6245 , G06F1/10 , H03L7/00 , H04B3/32 , H04J3/0697 , H04L25/0278 , H04L43/16 , H04L47/25 , H04L47/521 , H04L47/6215 , H04L47/722
摘要： A method of optimizing filter performance through monitoring channel characteristics is provided. A signal enters a channel and a receiver receives the signal. The receiver includes a FIR filter to remove near-end transmitted interference and recover a far-end desired signal. The filter has storage elements configured as a shift registers to move the signal, multipliers to multiply the signal by a filter coefficient, an intermittent summer to combine the multiplied results into a replica of an interfering signal, a final summer to remove the replica from the receiver signal to provide direct and indirect monitoring of the signal, where direct monitoring includes time or frequency monitoring, and indirect monitoring includes monitoring signal to noise ratio, error magnitude or bit error rate. The filter is optimized according to monitoring and includes reducing a dynamic range, reducing bits of precision, reducing linearity, the filter, and reallocating the filter.
摘要翻译： 提供了一种通过监控通道特性来优化滤波器性能的方法。 一个信号进入一个通道，一个接收器接收信号。 接收机包括用于去除近端传输干扰并恢复远端期望信号的FIR滤波器。 滤波器具有配置为移位寄存器的存储元件，用于移动信号，乘法器将信号乘以滤波器系数，间歇夏季，以将相乘的结果合并为干扰信号的复制品，最后一个夏季从 接收机信号提供对信号的直接和间接监测，其中直接监视包括时间或频率监测，间接监测包括监测信噪比，误差幅度或误码率。 滤波器根据监控进行优化，包括减少动态范围，降低精度，降低线性度，滤波器和重新分配滤波器。
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公开(公告)号：US07483479B2
公开(公告)日：2009-01-27
申请号：US10944168
申请日：2004-09-16
IPC分类号： H03K5/159
CPC分类号： H03H21/0067 , H03H21/0001 , H03H21/0012
摘要： An adaptive transversal filter having tap weights Wj which are products of corresponding tap coefficients Cj and tap gains Mj is provided. A filter control loop controls all of the tap coefficients Cj such that an error signal derived from the filter output is minimized. One or more tap control loops controls a tap gain Mk such that the corresponding tap coefficient Ck satisfies a predetermined control condition. For example, |Ck| can be maximized subject to a constraint |Ck|≦Cmax, where Cmax is a predetermined maximum coefficient value. In this manner, the effect of quantization noise on the coefficients Cj can be reduced. Multiple tap control loops can be employed, one for each tap. Alternatively, a single tap control loop can be used to control multiple taps by time interleaving.
摘要翻译： 提供具有作为对应抽头系数Cj和抽头增益Mj的乘积的抽头权重Wj的自适应横向滤波器。 滤波器控制环控制所有抽头系数Cj，使得从滤波器输出得到的误差信号最小化。 一个或多个抽头控制回路控制抽头增益Mk使得对应的抽头系数Ck满足预定的控制条件。 例如| Ck | 可以最大化受约束| Ck | <= Cmax，其中Cmax是预定的最大系数值。 以这种方式，可以减小量化噪声对系数Cj的影响。 可以采用多个抽头控制回路，每个抽头一个。 或者，可以使用单抽头控制回路来通过时间交织来控制多个抽头。
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公开(公告)号：US20080275929A1
公开(公告)日：2008-11-06
申请号：US11981565
申请日：2007-10-30
IPC分类号： G06F17/10
CPC分类号： H04L47/6245 , G06F1/10 , H03L7/00 , H04B3/32 , H04J3/0697 , H04L25/0278 , H04L43/16 , H04L47/25 , H04L47/521 , H04L47/6215 , H04L47/722
摘要： A method of optimizing filter performance through monitoring channel characteristics is provided. A signal enters a channel and a receiver receives the signal. The receiver includes a FIR filter to remove near-end transmitted interference and recover a far-end desired signal. The filter has storage elements configured as a shift registers to move the signal, multipliers to multiply the signal by a filter coefficient, an intermittent summer to combine the multiplied results into a replica of an interfering signal, a final summer to remove the replica from the receiver signal to provide direct and indirect monitoring of the signal, where direct monitoring includes time or frequency monitoring, and indirect monitoring includes monitoring signal to noise ratio, error magnitude or bit error rate. The filter is optimized according to monitoring and includes reducing a dynamic range, reducing bits of precision, reducing linearity, the filter, and reallocating the filter.
摘要翻译： 提供了一种通过监控通道特性来优化滤波器性能的方法。 一个信号进入一个通道，一个接收器接收信号。 接收机包括用于去除近端传输干扰并恢复远端期望信号的FIR滤波器。 滤波器具有配置为移位寄存器的存储元件，用于移动信号，乘法器将信号乘以滤波器系数，间歇夏季，以将相乘的结果合并为干扰信号的复制品，最后一个夏季从 接收机信号提供对信号的直接和间接监测，其中直接监视包括时间或频率监测，间接监测包括监测信噪比，误差幅度或误码率。 滤波器根据监控进行优化，包括减少动态范围，降低精度，降低线性度，滤波器和重新分配滤波器。
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公开(公告)号：US6023191A
公开(公告)日：2000-02-08
申请号：US920369
申请日：1997-08-29
CPC分类号： H03G7/007
摘要： A level detector detects an input signal level. A rectifier (210) receives the input signal and provides a rectified signal. A prefilter (220) receives the rectified signal and attenuates high frequency components at frequencies near multiples of a decimation sample rate. The prefiltered signal is decimated (230) and low pass filtered by a lowpass filter (240) having a passband below the input frequency of the input signal. The level detector can be provided to control a variable gain stage circuit (935, 1010) which applies a gain to the input signal based on the level to form a dynamic range compressor or expander.
摘要翻译： 电平检测器检测输入信号电平。 整流器（210）接收输入信号并提供整流信号。 预滤波器（220）接收经整流的信号，并以接近抽取采样率的倍数的频率衰减高频分量。 预滤波信号被抽取（230），并且通过具有低于输入信号的输入频率的通带的低通滤波器（240）进行低通滤波。 可以提供电平检测器以控制可变增益级电路（935,1010），该可变增益级电路基于该电平对输入信号施加增益以形成动态范围压缩器或扩展器。
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