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公开(公告)号：US5838799A
公开(公告)日：1998-11-17
申请号：US453564
申请日：1995-05-26
IPC分类号： H04B1/16 , H04B1/30 , H04H20/30 , H04H60/73 , H04J1/00 , H04J1/14 , H04J11/00 , H04L5/02 , H04L27/26 , H04H5/00 , H04H1/00
CPC分类号： H04L27/2602 , H04B1/16 , H04B1/30 , H04H20/30 , H04J1/14 , H04L5/023 , H04H2201/183 , H04H60/73
摘要： A method and apparatus for transmitting digital sound is disclosed. The method contemplates transmitting a digital radio signal (such as an FM band signal) over a plurality of sub-channels subject to some constraints on the digital signal power. A control sub-channel, sometimes referred to as an auxiliary overhead channel is used to transmit control information which is interpreted by the receiver to identify the location and potentially the mode of the digital signals.
摘要翻译： 公开了一种用于传输数字声音的方法和装置。 该方法考虑在数字信号功率受到一些约束的情况下在多个子信道上发送数字无线电信号（例如FM频带信号）。 有时称为辅助开销信道的控制子信道用于发送接收机解释的控制信息，以识别数字信号的位置和潜在的模式。
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公开(公告)号：US5995567A
公开(公告)日：1999-11-30
申请号：US835073
申请日：1997-04-04
IPC分类号： H04B3/06 , H04B1/10 , H04B1/12 , H04B3/32 , H04B15/00 , H04J11/00 , H04L5/14 , H04L27/26 , H04M3/00 , G09B3/00
CPC分类号： H04B1/123 , H04B1/126 , H04L27/2647
摘要： A receiver or receiver system for high speed data communications having a radio frequency noise canceller is disclosed. The radio frequency noise canceller removes radio-frequency noise from received signals over a transmission medium by adaptively estimating the radio-frequency noise during data transmission. In one embodiment, the radio frequency noise canceller includes: an adaptive filter for producing a noise cancellation signal by filtering a reference noise signal based on filter parameters, a subtractor for subtracting the noise cancellation signal from the first signal to produce the second signal; and an update circuit for enabling, at predetermined times, modification of the parameters of the adaptive filter based on the then existing second signal. A method for removing radio frequency noise is also disclosed.
摘要翻译： 公开了一种用于具有射频噪声消除器的高速数据通信的接收机或接收机系统。 无线电频率噪声消除器通过在数据传输期间自适应地估计射频噪声来消除传输介质上的接收信号的射频噪声。 在一个实施例中，射频噪声消除器包括：自适应滤波器，用于通过基于滤波器参数对参考噪声信号进行滤波来产生噪声消除信号;减法器，用于从第一信号中减去噪声消除信号以产生第二信号; 以及更新电路，用于在预定时间基于当时存在的第二信号来修改自适应滤波器的参数。 还公开了一种用于消除射频噪声的方法。
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3.发明授权
公开(公告)号：US5623513A
公开(公告)日：1997-04-22
申请号：US165509
申请日：1993-12-13
CPC分类号： H04L27/2647 , H04B14/046 , H04B3/23 , H04L27/2602 , H04L27/2623
摘要： A transmission system includes transmit and receive paths coupled via a hybrid circuit to a bidirectional transmission path. The transmit path includes a digital-to-analog converter (DAC) having a given range and precision. The transmit path signal is limited and truncated to this range and precision before the DAC. In one arrangement including an echo canceller coupled between the transmit and receive paths, a difference of the transmit path signal before and after limiting and truncation is used to produce an estimated echo response which is subtracted from the receive path signal. In another arrangement, all of the inputs to the echo canceller are derived from the transmit path after the limiting and truncation. Instead, or in addition, the amplitudes of transmit path signal samples can be shaped in conjunction with the limiting. The system can in particular be an ADSL transmission system using multicarrier modulation. In such a system the amplitudes of transmit path signal samples can be scaled to reduce clipping, with an indication of the scaling being transmitted to a remote receiver.
摘要翻译： 传输系统包括经由混合电路耦合到双向传输路径的发射和接收路径。 发射路径包括具有给定范围和精度的数模转换器（DAC）。 传输路径信号被限制并在DAC之前被截断到这个范围和精度。 在包括耦合在发送和接收路径之间的回波消除器的一种布置中，使用限制和截断之前和之后的发送路径信号的差异来产生从接收路径信号中减去的估计回波响应。 在另一种布置中，回波消除器的所有输入从限制和截断之后的发送路径导出。 替代地，或者另外，传输路径信号样本的幅度可以与限制一起成形。 该系统可以特别地是使用多载波调制的ADSL传输系统。 在这样一个系统中，发送路径信号样本的幅度可以被缩放以减少削波，并且缩放的指示被发送到远程接收机。
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4.发明授权
公开(公告)号：US5787113A
公开(公告)日：1998-07-28
申请号：US789154
申请日：1997-01-24
CPC分类号： H04L27/2647 , H04B14/046 , H04B3/23 , H04L27/2602 , H04L27/2623
摘要： A transmission system includes transmit and receive paths coupled via a hybrid circuit to a bidirectional transmission path. The transmit path includes a digital-to-analog converter (DAC) having a given range and precision. The transmit path signal is limited and truncated to this range and precision before the DAC. In one arrangement including an echo canceller coupled between the transmit and receive paths, a difference of the transmit path signal before and after limiting and truncation is used to produce an estimated echo response which is subtracted from the receive path signal. In another arrangement, all of the inputs to the echo canceller are derived from the transmit path after the limiting and truncation. Instead, or in addition, the amplitudes of transmit path signal samples can be shaped in conjunction with the limiting. The system can in particular be an ADSL transmission system using multicarrier modulation. In such a system the amplitudes of transmit path signal samples can be scaled to reduce clipping, with an indication of the scaling being transmitted to a remote receiver.
摘要翻译： 传输系统包括经由混合电路耦合到双向传输路径的发射和接收路径。 发射路径包括具有给定范围和精度的数模转换器（DAC）。 传输路径信号被限制并在DAC之前被截断到这个范围和精度。 在包括耦合在发送和接收路径之间的回波消除器的一种布置中，使用限制和截断之前和之后的发送路径信号的差异来产生从接收路径信号中减去的估计回波响应。 在另一种布置中，回波消除器的所有输入从限制和截断之后的发送路径导出。 替代地，或者另外，传输路径信号样本的幅度可以与限制一起成形。 该系统可以特别地是使用多载波调制的ADSL传输系统。 在这样一个系统中，发送路径信号样本的幅度可以被缩放以减少削波，并且缩放的指示被发送到远程接收机。
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5.发明授权Method and apparatus for coordinating multi-point to point communications in a multi-tone data transmission system 有权用于在多音调数据传输系统中协调多点到点通信的方法和装置公开(公告)号：US07079549B2
公开(公告)日：2006-07-18
申请号：US10051601
申请日：2002-01-17
CPC分类号： H04L1/0025 , H04L1/206 , H04L5/0007 , H04L5/0037 , H04L5/0048 , H04L5/0064 , H04L5/0091 , H04L5/023 , H04L27/2601 , H04L27/2608 , H04L2001/0093
摘要： A variety of bi-directional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that include the transmission of signals over twisted pair, fiber and/or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.
摘要翻译： 公开了使用基于帧的离散多载波传输方案来促进多个远程单元（15）和中央单元（10）之间的通信的各种双向数据传输系统。 在每个系统中，从多个远程单元（15）发送的帧在中央单元（10）处同步。 公开了用于协调多个远程单元（15）和中央单元（10）之间的通信以便于多点到点传输的各种新颖的调制解调器布置和方法。 本发明应用于各种各样的数据传输方案，包括非对称数字用户线路系统，包括通过双绞线，光纤和/或混合电话线路传输信号，包括通过同轴电缆传输信号的电缆系统，以及 包括无线电信号传输的数字蜂窝电视系统。
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6.发明授权Method and apparatus for coordinating multi-point to point communications in a multi-tone data transmission system 有权用于在多音调数据传输系统中协调多点到点通信的方法和装置公开(公告)号：US07068678B2
公开(公告)日：2006-06-27
申请号：US10052194
申请日：2002-01-17
IPC分类号： H04L12/403
CPC分类号： H04L1/0025 , H04L1/206 , H04L5/0007 , H04L5/0037 , H04L5/0048 , H04L5/0064 , H04L5/0091 , H04L5/023 , H04L27/2601 , H04L27/2608 , H04L2001/0093
摘要： A variety of bi-directional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that includes the transmission of signals over twisted pair, fiber and/or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.
摘要翻译： 公开了使用基于帧的离散多载波传输方案来促进多个远程单元（15）和中央单元（10）之间的通信的各种双向数据传输系统。 在每个系统中，从多个远程单元（15）发送的帧在中央单元（10）处同步。 公开了用于协调多个远程单元（15）和中央单元（10）之间的通信以便于多点到点传输的各种新颖的调制解调器布置和方法。 本发明可应用于各种各样的数据传输方案，包括非对称数字用户线系统，其包括通过双绞线，光纤和/或混合电话线路传输信号，包括通过同轴电缆传输信号的电缆系统，以及 包括无线电信号传输的数字蜂窝电视系统。
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公开(公告)号：US06404830B2
公开(公告)日：2002-06-11
申请号：US09864765
申请日：2001-05-24
申请人： Brian R. Wiese , John A. C. Bingham
发明人： Brian R. Wiese , John A. C. Bingham
IPC分类号： H04L2508
CPC分类号： H04L27/2647 , H04B1/1027 , H04B1/1036 , H04B1/123 , H04B1/126 , H04B2001/1063 , H04L5/0007 , H04L5/0044 , H04L5/0062 , H04L27/2602
摘要： Disclosed are radio frequency (RF) interference cancellation techniques that effectively estimate RF interference to the data signals being received using a frequency domain model, and then remove the estimated RF interference from the received data signals. Improved techniques for digitally filtering multicarrier modulation samples to reduce sidelobe interference due to the RF interference are also disclosed.
摘要翻译： 公开了射频（RF）干扰消除技术，其有效地估计使用频域模型接收的数据信号的RF干扰，然后从接收的数据信号中去除估计的RF干扰。 还公开了用于数字滤波多载波调制样本以减少由于RF干扰引起的旁瓣干扰的改进技术。
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8.发明授权Method and apparatus for correcting for clock and carrier frequency offset, and phase jitter in multicarrier modems 失效用于校正时钟和载波频率偏移的方法和装置以及多载波调制解调器中的相位抖动
公开(公告)号：US5228062A
公开(公告)日：1993-07-13
申请号：US889464
申请日：1992-05-27
申请人： John A. C. Bingham
发明人： John A. C. Bingham
IPC分类号： H04L27/26
CPC分类号： H04L27/2657 , H04L27/2679
摘要： A method of correcting for the impairments of phase jitter and frequency offset imposed by a transmission medium and of a clock frequency difference between a transmitting and a receiving multicarrier modem is disclosed. The method comprises two modes: a training mode that uses pilot tones, and a data mode that uses random data modulated onto many carriers. During the training mode the frequencies of the phase jitter are estimated, and the parameters of a correcting signal are initialized; during the data mode the correcting signal is used to compensate for the impairments, and then is updated from an estimate of the phase error.
摘要翻译： 公开了一种校正由传输介质施加的相位抖动和频率偏移以及发射和接收多载波调制解调器之间的时钟频率差的损伤的方法。 该方法包括两种模式：使用导频音的训练模式，以及使用调制到许多载波上的随机数据的数据模式。 在训练模式期间，估计相位抖动的频率，校正信号的参数被初始化; 在数据模式期间，校正信号用于补偿损伤，然后从相位误差的估计中更新。
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公开(公告)号：US5838667A
公开(公告)日：1998-11-17
申请号：US910125
申请日：1997-08-13
申请人： John A. C. Bingham , Po Tong
发明人： John A. C. Bingham , Po Tong
CPC分类号： H04L5/1484 , H04L25/4921 , H04L5/023
摘要： A method of coordinating very high speed bi-directional data transmissions between a central unit and a plurality of remote units over distinct twisted pair transmission lines that share a binder is described. Specifically, periodic synchronized upstream and downstream communication periods are provided that do not overlap with one another. The upstream and downstream communication periods for all of the wires that share a binder are synchronized. With this arrangement, all of the very high speed transmissions within the same binder are synchronized and time division duplexed such that downstream communications are not transmitted at times that overlap with the transmission of upstream communications. In some embodiments, quiet periods are provided to separate the upstream and downstream communication periods. The described invention may be used in conjunction with a wide variety of modulation schemes, including both multi-carrier and single carrier transmission schemes. It is backwards compatible with existing systems and has particular advantages in very high performance systems.
摘要翻译： 描述了一种通过共享粘合剂的不同双绞线传输线在中央单元和多个远程单元之间协调非常高速度的双向数据传输的方法。 具体地，提供不彼此重叠的周期性同步的上游和下游通信周期。 共享粘合剂的所有电线的上下游通信周期是同步的。 通过这种安排，同一装载机内的所有非常高速的传输是同步的，并且进行时分双工，使得下游通信在与上行通信的传输重叠的时间不传输。 在一些实施例中，提供安静周期以分离上游和下游通信周期。 所描述的发明可以与多种调制方案结合使用，包括多载波和单载波传输方案。 它与现有系统向后兼容，并且在非常高性能的系统中具有特殊的优势。
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10.发明授权Duplex data transmission modem utilizing an injected tone for shifting power within the transmit spectrum 失效双重数据传输调制解调器利用发射频谱中的移位功率进行注射
公开(公告)号：US4101833A
公开(公告)日：1978-07-18
申请号：US775104
申请日：1977-03-07
CPC分类号： H04L5/14
摘要： A full duplex communication system including a pair of full duplex modems. Each modem has both a call originate mode of operation and a call answer mode of operation. In the call originate mode outgoing data is transmitted by modulation of a carrier frequency F2 and incoming data is received by demodulation of a data modulating carrier of frequency F1. When in the answer mode of operation, the data is received on frequency F2 and transmitted on frequency F1. Means are provided for injecting a carrier frequency F6 in the outgoing data transmission path. The frequency F6 is near the midpoint between F1 and F2. The amplitude is such that the distribution of power within the transmission band is balanced so that the power in the frequency band set aside for single frequency signaling systems does not exceed the power in the remainder of the transmission band. This prevents the false operation of signal frequency systems triggered by the transmission of certain bit patterns, which could result in improper billing, intermittent transmission interruptions, insertion of a band elimination filter in the transmission path or the complete disconnection of a call.
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