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1.发明授权TDM data communications network wherein each data frame is divided into respective lower rate sub-frames for respective sets of substations, and main station and substation for use therein 失效TDM数据通信网络，其中每个数据帧被分成用于各组变电站的相应的较低速率子帧，以及用于其中的主站和变电站
公开(公告)号：US5509003A
公开(公告)日：1996-04-16
申请号：US273529
申请日：1994-07-11
CPC分类号： H04J3/1694
摘要： Telecommunications passive optical networks are known which employ a TDMA frame structure for transmission between a main station and a number of substations. Due to increased capacity demands and still further service demands, there is a need for higher bit rates over such networks. The invention provides a high bit rate passive optical network wherein the substations operate at only a fraction of the network bit rate, and so are hardly more complex than in lower bit rate networks. That is achieved by formation by the main station of sub-frames of the data intended for transmission to a number of the substations, and bit interleaving the sub-frames to form a data frame which is transmitted over the optical fiber cable. Each substation is adjusted to only listen to the sub-frame to which it is assigned. In one embodiment the substations are automatically adjusted to only listen to a particular phase in the interleaved bit stream, which is identified by phase adjustment data transmitted by the main station in a housekeeping time slot of the data frame.
摘要翻译： 电信无源光网络是已知的，其采用TDMA帧结构用于主站和多个变电站之间的传输。 由于容量需求的增加和更多的服务需求，需要在这样的网络上具有更高的比特率。 本发明提供了一种高比特率无源光网络，其中，分站仅以网络比特率的一小部分进行操作，并且因此比在较低比特率网络中难以复杂。 这是通过主站将用于传输到多个变电站的数据的子帧形成，并且对子帧进行位交织以形成通过光纤电缆传输的数据帧。 每个变电站被调整为仅监听其被分配到的子帧。 在一个实施例中，变电站被自动调整为仅监听交错比特流中的特定相位，其由主站在数据帧的管理时隙中发送的相位调整数据识别。
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公开(公告)号：US5307328A
公开(公告)日：1994-04-26
申请号：US950107
申请日：1992-09-23
申请人： Bernardus A. J. Jacobs , Petrus A. M. Van Grinsven , Wilfred A. M. Snijders , Johannes H. M. Spruit
发明人： Bernardus A. J. Jacobs , Petrus A. M. Van Grinsven , Wilfred A. M. Snijders , Johannes H. M. Spruit
IPC分类号： G11B5/02 , G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10554 , G11B11/10532
摘要： A device for writing, reading or erasing a record carrier has a coil with a winding arranged between an objective lens and the record carrier. Optical radiation is focused to a spot, the converging beam passing through the coil opening. A core of a transparent material, having an index of refraction which significantly decreases vergence of the focused beam, is placed in the winding opening. As a result the diameter of the coil can be reduced, and permit increase of the generated magnetic field.
摘要翻译： 用于写入，读取或擦除记录载体的装置具有设置在物镜和记录载体之间的缠绕线圈。 光辐射被聚焦到一个点，会聚光束通过线圈开口。 将透明材料的芯体放置在卷绕开口中，折射率明显降低聚焦光束的聚集度。 结果，线圈的直径可以减小，并且允许增加所产生的磁场。
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3.发明授权Telecommunication system and a main station and a substation for use in such a system 失效电信系统以及用于这种系统的主站和变电站
公开(公告)号：US5579321A
公开(公告)日：1996-11-26
申请号：US213485
申请日：1994-03-14
IPC分类号： H04B10/272 , H04J3/06 , H04L7/033 , H04L7/04 , H04J3/00
CPC分类号： H04J3/0682 , H04B10/272 , H04L7/0337 , H04L7/042 , H04L7/044
摘要： Telecommunication systems such as PON-FITL-Systems have a TDMA frame structure comprising a main station and a number of substations. In order to achieve accurate fine ranging, an A/D-converter for acquiring samples from a ranging pulse transmitted from the substation is operated at a frequency which is high with respect to the master or bit clock, i.e. real time oversampling occurs. Such high speed A/D-converters are expensive, consume much power and have limited resolution. Furthermore, for systems with even higher bit rates the known oversampling becomes cumbersome. A quasi-oversampled coarse and/or fine ranging is proposed operating at relatively low sampling rates. Thus the substations send a repetitive ranging-bit-pattern which is sampled in the main station and thereafter reconstructed in a processing apparatus to a quasi-oversampled ranging-bit-pattern. In order to find the ranging error to be sent to the relevant substation, the quasi-oversampled ranging-bit-pattern is matched against a reference pattern, and the ranging error is found from the best match.
摘要翻译： 诸如PON-FITL-Systems的电信系统具有包括主站和多个变电站的TDMA帧结构。 为了实现精确的精细测距，用于从从变电站发送的测距脉冲中采集采样的A / D转换器以相对于主站或位时钟为高的频率工作，即发生实时过采样。 这种高速A / D转换器是昂贵的，消耗大量功率并且分辨率有限。 此外，对于具有更高比特率的系统，已知的过采样变得麻烦。 提出了一种准过采样的粗和/或精细测距，以较低的采样率运行。 因此，变电站发送重复的测距位模式，其在主站中被采样，然后在处理设备中被重构为准过采样的测距位模式。 为了找到要发送到相关变电站的测距误差，将准过采样测距位模式与参考模式进行匹配，并从最佳匹配中找到测距误差。
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公开(公告)号：US5619504A
公开(公告)日：1997-04-08
申请号：US213483
申请日：1994-03-14
CPC分类号： H04J3/0682 , H04Q11/0478 , H04J2203/0032 , H04L2012/561 , H04L2012/5674
摘要： Telecommunication systems such as PON-FITL-Systems are known having a TDMA frame structure and comprising a main station and a number of substations. The known systems can comprise apparatus for coarse ranging and for fine ranging. A Pseudo Noise Sequence based coarse ranging technique employs coarse ranging at a fixed position within the upstream multiframe reserved for ranging, preferably for fine ranging. By applying a low power Pseudo Noise Sequence for coarse ranging and sampling the range in the main station only within a fine ranging window the position of which is known to the main station, a more accurate coarse ranging is achieved. Within the fine ranging window normally no data are present, and thus the signal-to-interference ratio is an order of magnitude better than in the other part of the frame.
摘要翻译： 具有TDMA帧结构的PON-FITL-Systems等通信系统是已知的，并且包括主站和多个变电站。 已知的系统可以包括用于粗范围和精细测距的装置。 基于粗噪声序列的粗测距技术在保留用于测距的上游复帧内的固定位置使用粗距离，优选地用于精细测距。 通过应用低功率伪噪声序列来粗略测距和采样主站中的范围，仅在主站已知位置的精细测距窗口内，实现更准确的粗程度。 在精细测距窗内通常没有数据存在，因此信号干扰比比帧的其他部分好一个数量级。
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公开(公告)号：US4130806A
公开(公告)日：1978-12-19
申请号：US799884
申请日：1977-05-23
CPC分类号： H04L27/06 , H03D3/007 , H03D5/00 , H03D2200/0047 , H03D2200/0056 , H03D2200/006 , H03D2200/0082 , H03D7/165
摘要： A digital filter and demodulation arrangement for passband signals, whose corresponding baseband signal has a bandwidth limited to a given maximum frequency. The passband signals are filtered according to two bandpass characteristics which, apart from their asymmetrical distortion relative to their central frequency, are versions from one another shifted 90.degree. in phase. The filtered passband signals are demodulated with an in-phase carrier and a quadrature carrier and the demodulated signals are combined to a baseband signal.In the digital filtering process the sampling frequency is reduced from a value higher than twice the highest frequency in the passband signals to a value which is not higher than twice said maximum frequency in the baseband signal and in the digital demodulation and combination processes the reduced sampling frequency is also used so that a considerable reduction in the internal processing speed is obtained.
摘要翻译： 用于通带信号的数字滤波器和解调装置，其相应的基带信号的带宽限制在给定的最大频率上。 根据两个带通特性对通带信号进行滤波，除了相对于它们的中心频率的不对称失真之外，它们的相位是相位相差90°。 滤波后的通带信号用同相载波和正交载波进行解调，解调后的信号与基带信号组合。
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6.发明授权Communication system for bi-phase transmission of data and having sinusoidal low pass frequency response 失效用于数据双向传输和具有正弦低通频率响应的通信系统
公开(公告)号：US4573169A
公开(公告)日：1986-02-25
申请号：US560767
申请日：1983-12-12
IPC分类号： H03M5/12 , H04L25/03 , H04L25/49 , H04L25/493 , H04L25/497 , H04B1/66 , H03C3/00 , H03D3/00
CPC分类号： H04L25/4904 , H04L25/03114
摘要： A data communication system for transmission of bi-phase signals modulated by data symbols and in which the signals are filtered in accordance with a frequency response which approximates zero at 0 H.sub.z and at and exceeding the frequency 3/(2T) H.sub.z and which has an approximately sinusoidal variation between those frequencies, T being the symbol interval. This filter characteristic minimizes intersymbol interference and improves the signal-to-noise ratio. The requisite filtering may be provided in the receiver or in part in the receiver and in part in the transmitter of the communication system.
摘要翻译： 一种用于传输由数据符号调制的双相信号的数据通信系统，其中根据在0Hz处接近零并且频率为3 /（2T）Hz的频率响应近似为零的信号被滤波，并且具有 这些频率之间的近似正弦变化，T是符号间隔。 该滤波器特性使符号间干扰最小化，并提高了信噪比。 必要的过滤可以在接收机中或部分地在接收机中提供，并且部分地在通信系统的发射机中提供。
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公开(公告)号：US4362909A
公开(公告)日：1982-12-07
申请号：US142304
申请日：1980-04-21
CPC分类号： H04L5/1423 , H04B3/23
摘要： Echo canceler for use in a data transmission system, comprising two and four-wire connections and arranged to suppress echo signals occurring in the four-wire connection. This echo canceler is provided with an adjustable signal processing device to which the data signal to be transmitted is applied and which produces a synthetic echo signal. A signal formed by a received data signal and an echo signal is present in the receive path of the four-wire connection. From the signals in the receive path there is now subtracted the synthetic echo signal, in order to generate a residual signal.To adjust the signal processing device an adjusting device is connected thereto to which a digital control signal is applied, which is constituted by a digital version of the residual signal.In order to improve the quality of the residual signal which is obtained when the data signal to be transmitted comprises long trains of data symbols of the same type the residual signal is subjected to a high-pass filter operation and the digital version of the residual signal filtered thus is applied to the adjusting device as the control signal.
摘要翻译： 回波消除器用于数据传输系统，包括两线和四线连接，并被布置成抑制在四线连接中发生的回波信号。 这个回波消除器设有一个可调信号处理装置，要发射的数据信号被应用到该可调信号处理装置，并产生合成的回波信号。 由接收的数据信号和回波信号形成的信号存在于四线连接的接收路径中。 从接收路径中的信号中，现在减去合成回波信号，以产生残余信号。 为了调整信号处理装置，连接有调制装置的数字控制信号被应用到数字控制信号，该数字控制信号由残留信号的数字版本构成。 为了提高要发送的数据信号包含相同类型的数据符号的长串获得的残留信号的质量，残差信号经受高通滤波操作，并且剩余信号的数字版本 滤波后作为控制信号施加于调整装置。
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公开(公告)号：US4334128A
公开(公告)日：1982-06-08
申请号：US128418
申请日：1980-03-10
CPC分类号： H04L5/1423 , H04B3/23
摘要： Echo canceller for use in a homochronous data transmission system, comprising two-wire and four-wire connections and arranged for suppressing echo signals occurring in the four-wire connection. This echo canceller comprises an adjustable signal processing arrangement to which the data signal to be transmitted is applied and which produces a synthetic echo signal. A signal formed by a received data signal and an echo signal is present in the receive path of the four-wire connection. To generate a residual signal, the synthetic echo signal is subtracted from the signals in the receive path.For the adjustment of the signal processing arrangement there is added to this residual signal, outside the receive path of the four-wire connection, an auxiliary signal which is not correlated to this residual signal. The sum signal thus obtained is sampled with a suitably chosen sampling rate which is harmonically related to the symbol rate. The signal samples obtained are applied to a limiter circuit which converts each signal sample into a positive or a negative pulse, which is indicative of the polarity of the signal sample. The pulses thus obtained are applied as the control signal to an adjusting device for adjusting the signal processing arrangement.
摘要翻译： 用于同步数据传输系统的回波消除器，包括双线和四线连接并被布置成用于抑制在四线连接中发生的回波信号。 该回波消除器包括可应用的信号处理装置，要发送的数据信号被施加到该信号处理装置，并产生合成回波信号。 由接收的数据信号和回波信号形成的信号存在于四线连接的接收路径中。 为了产生残留信号，从接收路径中的信号中减去合成回波信号。 对于信号处理装置的调整，在四线连接的接收路径之外的这个残余信号中加上与该残差信号不相关的辅助信号。 如此获得的和信号被采用与符号率谐波相关的适当选择的采样率。 所获得的信号样本被施加到限制器电路，其将每个信号样本转换成正或负脉冲，其表示信号样本的极性。 这样获得的脉冲作为控制信号被施加到用于调整信号处理装置的调节装置。
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公开(公告)号：US4313203A
公开(公告)日：1982-01-26
申请号：US134038
申请日：1980-03-26
CPC分类号： H04L25/4925
摘要： A transmission system for the transmission of binary data symbols is described in which a so-called "crankshaft code," in combination with a receiver having a special filter characteristic, enables a more optimum signal detection, independent of the cable characteristic.The system is used for digital transmission over cables in the local telephone network.
摘要翻译： 描述了用于传输二进制数据符号的传输系统，其中所谓的“曲轴码”与具有特殊滤波器特性的接收机相结合，能够实现与电缆特性无关的更优化的信号检测。 该系统用于通过本地电话网络中的电缆进行数字传输。
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10.发明授权
公开(公告)号：US4800384A
公开(公告)日：1989-01-24
申请号：US866647
申请日：1986-05-27
CPC分类号： G06F11/2289 , G06F12/0676
摘要： A modular coupling unit which functions as an interface between a communication unit or peripheral apparatus and the communication network includes a code word signal generator for generating a unique address code which is representative of the geographical location in which the relevant coupling unit is "permanently" included in the communication network. This signal generator is and continues to be energized as soon as and for so long as a communication unit or peripheral apparatus is and has been connected to the coupling unit. The address codes generated in bursts by such a generator are transferred via a connecting cable between the relevant communication unit and the coupling unit to this communication unit. The relevant address code is stored in the coupling unit. On request and within the time regime holding for the communication network, the address code is read and transferred to a diagnostic module via the communication network. Thus a geographical survey of the communication network with the peripheral apparatus connected thereto can be obtained. The geographical address of a communication unit in which a disturbance has occurred can thus be determined, using an error search algorithm.
摘要翻译： 用作通信单元或外围设备与通信网络之间的接口的模块化耦合单元包括一个代码字信号发生器，用于产生一个唯一的地址代码，该代码字代表相关耦合单元被“永久地”包括在内的地理位置 在通信网络中。 只要通信单元或外围设备已连接到耦合单元，该信号发生器就一直被持续通电。 通过这种发生器产生的地址码通过相关通信单元和耦合单元之间的连接电缆传送到该通信单元。 相关地址代码存储在耦合单元中。 根据请求，在通信网络持续时间内，通过通信网络将地址代码读取并传送到诊断模块。 因此，可以获得与与其连接的外围设备的通信网络的地理调查。 因此可以使用错误搜索算法来确定发生干扰的通信单元的地理位置。
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