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1.发明授权Filter system and method to suppress interference imposed upon a frequency-division multiplexed channel 失效用于抑制施加在频分复用信道上的干扰的滤波系统和方法公开(公告)号：US06744883B1
公开(公告)日：2004-06-01
申请号：US09479519
申请日：2000-01-07
申请人： Thomas J. Bingel , Gordon Bremer , Ramon B. Hazen
发明人： Thomas J. Bingel , Gordon Bremer , Ramon B. Hazen
IPC分类号： H04M100
CPC分类号： H04M1/74
摘要： A filter system (and associated filtering method) is disclosed, the filter system being connected between a large-amplitude, high-frequency noise source and a frequency-division multiplexed communications channel. The large-amplitude, high-frequency noise commonly being a POTS (plain old telephone service) ring signal generated by a CO (central office) telephone switch. The frequency-division multiplexed communications channel generally used to carry digital signals at frequencies above the POTS baseband in order to implement a digital subscriber line (DSL). Large-amplitude, high-frequency signal components from the POTS ring signal impair the performance of frequency-division multiplexed channels on a transmission line such as a subscriber loop. The filter system of the present invention utilizes amplitude and also may utilize frequency to selectively suppress the transients and harmonics on the transmission line caused by a telephone ring signal. In addition, the present invention uses bidirectional current limiting filters to implement some of the amplitude-dependent filtering behavior.
摘要翻译： 公开了一种滤波系统（以及相关的滤波方法），该滤波器系统连接在大振幅高频噪声源和频分复用通信信道之间。 大振幅高频噪声通常是由CO（中心局）电话交换机产生的POTS（普通老式电话业务）振铃信号。 频分复用通信信道通常用于承载POTS基带以上频率的数字信号，以实现数字用户线（DSL）。 来自POTS环形信号的大振幅，高频信号分量削弱了诸如用户环路等传输线上的频分复用信道的性能。 本发明的滤波器系统利用振幅，并且还可以利用频率来选择性地抑制由电话振铃信号引起的传输线上的瞬变和谐波。 此外，本发明使用双向限流滤波器来实现一些幅度依赖的滤波行为。
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公开(公告)号：US06757377B1
公开(公告)日：2004-06-29
申请号：US09318279
申请日：1999-05-25
申请人： Thomas J. Bingel , Ramon B. Hazen
发明人： Thomas J. Bingel , Ramon B. Hazen
IPC分类号： H04M1106
CPC分类号： H04L12/2854
摘要： A central office (CO) filter system connects between a CO telephone switch and a telephone connection (subscriber loop) that can communicate voice and digital data channels. The CO filter system suppresses transients and harmonics on the connection caused by a telephone ring signal (typically, 90 to 150 Vrms at 15 to 68 Hz) generated by the switch in order to minimize adverse effects on the digital data channel on the connection. Architecturally, the CO filter system includes a first filter designed to implement a first low pass filter function to attenuate frequencies higher than a ring signal so that transients and harmonics produced from the ring signal are suppressed, a second filter designed to implement a second low pass filter function to attenuate frequencies higher than a voice channel, and a current detector designed to detect when a telephone is off-hook. The current detector implements the first filter when the telephone is on-hook, particularly, when the ring signal occurs, and implements the second filter when the telephone is off-hook.
摘要翻译： 中心局（CO）滤波器系统连接在CO电话交换机和可以传送语音和数字数据信道的电话连接（用户环路）之间。 CO滤波器系统抑制由开关产生的电话振铃信号（通常为15至150Hz，通常为90至150Vrms）引起的连接上的瞬变和谐波，以便最小化对连接上数字数据通道的不利影响。 在结构上，CO滤波器系统包括第一滤波器，其被设计为实现第一低通滤波器功能以衰减高于环形信号的频率，从而抑制从环形信号产生的瞬变和谐波，设计成实现第二低通的第二滤波器 用于衰减高于语音通道的频率的滤波器功能，以及用于检测电话何时摘机的电流检测器。 当电话机挂机时，电流检测器实现第一滤波器，特别是在发生振铃信号时实现第一滤波器，并且在电话摘机时实现第二滤波器。
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3.发明授权公开(公告)号：US06477212B1
公开(公告)日：2002-11-05
申请号：US09756382
申请日：2001-01-08
申请人： Thomas J. Bingel , Ramon B. Hazen
发明人： Thomas J. Bingel , Ramon B. Hazen
IPC分类号： H04B300
CPC分类号： H04L25/085
摘要： The present invention provides a method and apparatus for eliminating or reducing local area and broad area interference in a twisted pair transmission system. The apparatus of the present invention includes a detection device, such as an antenna, for example, for detecting electromagnetic interference coupled into a twisted pair line, a sampling/scaling device which samples and scales the detected signal, and a combiner device which combines a signal correction component with the signal received over the twisted pair by a differential receiver. The sampling/scaling device preferably includes an analog-to-digital converter (ADC) which converts the detected analog signal into a digital signal and a digital signal processor, which receives the digital signal from the ADC and processes the signal to generate a correction signal. The correction signal is then subtracted from the signal received by the differential receiver. The sampling/scaling device may be fixed or adaptive.
摘要翻译： 本发明提供一种用于消除或减少双绞线传输系统中局部区域和广域干扰的方法和装置。 本发明的装置包括例如用于检测耦合到双绞线中的电磁干扰的天线等检测装置，对所检测到的信号进行采样和缩放的采样/缩放装置，以及组合器装置 信号校正分量，通过差分接收机通过双绞线接收的信号。 采样/缩放装置优选地包括将检测到的模拟信号转换成数字信号的数模转换器（ADC）和数字信号处理器，数字信号处理器从ADC接收数字信号并处理信号以产生校正信号 。 然后从由差分接收器接收的信号中减去校正信号。 采样/缩放装置可以是固定的或适应的。
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4.发明授权公开(公告)号：US06173021B2
公开(公告)日：2001-01-09
申请号：US08966180
申请日：1997-11-07
申请人： Thomas J. Bingel , Ramon B. Hazen
发明人： Thomas J. Bingel , Ramon B. Hazen
IPC分类号： H04B300
CPC分类号： H04L25/085
摘要： The present invention provides a method and apparatus for eliminating or reducing local area and broad area interference in a twisted pair transmission system. The apparatus of the present invention comprises a detection device, such as an antenna, for example, for detecting electromagnetic interference coupled into a twisted pair line, a sampling/scaling device which samples and scales the detected signal, and a combiner device which combines a signal correction component with the signal received over the twisted pair by a differential receiver. The sampling/scaling device preferably comprises an analog-to-digital converter (ADC) which converts the detected analog signal into a digital signal and a digital signal processor which receives the digital signal from the ADC and processes the signal to generate a correction signal. The correction signal is then subtracted from the signal received by the differential receiver. The sampling/scaling device may be fixed or adaptive. If the interference is stationary in time, a fixed sampling/scaling device is suitable for use with the present invention. If the interference is non-stationary, preferably the sampling/scaling device will be adaptive such that the amount of scaling performed can be altered in accordance with changes in the interference signal detected by the detector.
摘要翻译： 本发明提供一种用于消除或减少双绞线传输系统中局部区域和广域干扰的方法和装置。 本发明的装置包括例如用于检测耦合到双绞线中的电磁干扰的检测装置，例如天线，用于对检测到的信号进行采样和缩小的采样/缩放装置，以及组合器 信号校正分量，通过差分接收机通过双绞线接收的信号。 采样/缩放装置优选地包括将检测到的模拟信号转换为数字信号的模数转换器（ADC）和从ADC接收数字信号并处理该信号以产生校正信号的数字信号处理器。 然后从由差分接收器接收的信号中减去校正信号。 采样/缩放装置可以是固定的或适应的。 如果干扰在时间上是静止的，则固定的采样/缩放装置适用于本发明。 如果干扰是非平稳的，则优选采样/缩放装置将是自适应的，使得可以根据检测器检测到的干扰信号的变化来改变执行的缩放量。
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公开(公告)号：US5828657A
公开(公告)日：1998-10-27
申请号：US536916
申请日：1995-09-29
CPC分类号： H04B3/238
摘要： A far-end modem transmits a "pilot tone" during the time that a near-end modem is training its echo canceler. Correspondingly, the near-end modem is modified to notch, or filter, out this pilot tone from the received signal. The filtered received signal is then used by the near-end modem to train its echo canceler.
摘要翻译： 远端调制解调器在近端调制解调器训练其回波消除器的时间内发送“导频音”。 相应地，近端调制解调器被修改为从接收到的信号中切出或滤除该导频音。 滤波后的接收信号由近端调制解调器用于训练其回波消除器。
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公开(公告)号：US5812537A
公开(公告)日：1998-09-22
申请号：US536908
申请日：1995-09-29
摘要： A processor of a cellular modem monitors for the presence of a residual echo signal during a full-duplex portion of a training sequence. In particular, the processor monitors an equalizer error signal during a full-duplex training phase that follows the half-duplex training phase for the echo canceler. If the processor detects a level of the error signal greater than a predefined threshold, the processor presumes the increase in the error signal is due to the presence of a residual echo signal and performs a predefined adjustment of the taps of the corresponding echo canceler of the cellular modem.
摘要翻译： 蜂窝调制解调器的处理器在训练序列的全双工部分期间监视残留回波信号的存在。 特别地，处理器在跟随消声器的半双工训练阶段的全双工训练阶段期间监视均衡器误差信号。 如果处理器检测到大于预定义阈值的误差信号的电平，则处理器假定误差信号的增加是由于存在残留回波信号而导致的，并且执行相应回波消除器的抽头的预定义的调整 蜂窝调制解调器
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