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87 条记录 (耗时 0.014 秒)

    CIRCUIT FOR DETECTING OBJECT SIGNAL FROM INPUT SIGNAL
    81.
    发明公开
    CIRCUIT FOR DETECTING OBJECT SIGNAL FROM INPUT SIGNAL 失效
    SCHALTUNG ZUR ERFASSUNG EINES ZIELSIGNALS VON EINEM EINGANGSIGNAL。

    公开(公告)号：EP0577848A1

    公开(公告)日：1994-01-12

    申请号：EP93902540.9

    申请日：1993-01-28

    申请人： FUJITSU LIMITED

    发明人： AWATA, Yutaka ,  KAKUISHI, Mitsuo

    IPC分类号： H04L27/00

    CPC分类号： H04Q1/50 ,  G06F1/32 ,  H04L2007/047 ,  H04Q1/30

    摘要： An input analog signal having periodicity is converted to a 1-bit digital signal by an A/D convertor (42) and is then converted to a parallel signal by a serial-parallel convertor (43). Correlation between the parallel signal and a reference signal train is calculated by a correlation device (45). When this correlationship is obtained, it is held by a hold circuit (48) and a tone signal detection result is outputted. In this way, the tone signal is detected by a simple circuit construction having low power consumption.

    摘要翻译： 具有周期性的输入模拟信号由A / D转换器（42）转换为1位数字信号，然后由串并转换器（43）转换成并行信号。 通过相关装置（45）计算并行信号和参考信号序列之间的相关性。 当获得该相关性时，它由保持电路（48）保持，并且输出音调信号检测结果。 以这种方式，通过具有低功耗的简单电路结构来检测音调信号。

    Method and apparatus for synchronising a data stream with clock signals used for reading the data stream
    82.
    发明公开
    Method and apparatus for synchronising a data stream with clock signals used for reading the data stream 失效
    用于同步的时钟信号的数据，用于读取数据的方法和装置。

    公开(公告)号：EP0521646A1

    公开(公告)日：1993-01-07

    申请号：EP92305739.2

    申请日：1992-06-23

    申请人： International Business Machines Corporation

    发明人： Schneider, Richard Crane

    IPC分类号： H04L7/033 ,  H03L7/091

    CPC分类号： G11B20/10037 ,  G11B20/1403 ,  H03L7/091 ,  H04L7/007 ,  H04L7/06 ,  H04L2007/047

    摘要： The present invention relates to a method of synchronising an (1,k) modulated data stream with a clock signal, defining a sequence of time instances used to control the reading of the data stream, by estimating any phase error between the clock signal and the data stream and using the phase error to vary the clock signal which comprises the steps of detecting a peak in the data stream occurring at or adjacent to a first time instance and determining the polarity of the peak, detecting and storing the value of the data stream at selected time instances other than the first time instance, and using the values to estimate any phase error between said time instances and said the stream.
    According to the invention the method is characterised by the steps of detecting a first reference value of the data stream at two time instances before the first time instance, predicting a first expected value of the data stream at one time instance before the first time instance based on the first reference value and the polarity of the peak, detecting a second reference value of the data stream at one time instance before the first time instance, determining a first slope factor based on the first reference value, multiplying the first slope factor by the difference between the predicted first expected value and the second reference value to determine a first phase error, detecting a third reference value of the data stream at two time instances after the first time instance, predicting a second expected value of the data stream at one time instance after the first time instance based on the third reference value and the polarity of the peak, detecting a fourth reference value of the data stream at one time instance after the first time instance, determining a second slope factor based on the third reference value, multiplying the second slope factor by the difference between the predicted second expected value and the fourth reference value to determine a second phase error, and adjusting the clock to vary the occurrence of the time instances in accordance with the first and second phase errors in order to reduce the phase errors.

    摘要翻译： 本发明涉及到的同步伊辛（1，k）的调制与时钟信号的数据流， - 定义用于控制数据流的读出时间实例的序列的方法，通过估计时钟信号和之间的任何相位误差 数据流和使用所述相位误差改变，其包括在数据流中检测的峰，在发生的或邻近于第一时间实例和确定性采矿峰值，检测的极性和存储数据流的值的步骤的时钟信号 在选择比所述第一时间实例中的其他时刻，以及使用所述值来估计所述时间实例之间的任何相位误差，并表示的流。 。根据该方法是通过在一个时间实例的第一时刻之前的第一时刻之前，在两个时间实例检测数据流的第一基准值时，预测该数据流的一个第一期望值基于以下步骤为特征的本发明 所述第一参考值和峰值的极性，在第一时间实例之前在同一时间实例检测数据流的第二基准值根据所述第一参考值时，确定采矿第一斜率因子，通过乘以第一斜率因子 预测的第一预期值和第二基准值来确定的矿井的第一相位误差，所述第一时间实例之后在两个时间实例检测数据流的第三基准值，在同一时间预测数据流的第二预期值之间的差值 例如，基于所述第三参考值和峰值的极性的第一次实例之后，检测t的第四基准值 在第一时间实例的，确定性的采矿基于所述第三参考值的第二斜率因子，由预测的第二预期值和第四参考值，以确定矿的第二相位误差之间的差乘以所述第二斜率因子后，在一个时刻他数据流 和调整时钟，以改变，以便减少相位误差与所述第一和第二相位误差在雅舞蹈的时间实例的发生。

    Data transmission system
    85.
    发明公开
    Data transmission system 失效
    数据传输系统

    公开(公告)号：EP0228771A2

    公开(公告)日：1987-07-15

    申请号：EP86307780.6

    申请日：1986-10-08

    申请人： NORTHERN TELECOM LIMITED

    发明人： Fisher, David Anthoney

    IPC分类号： H04B3/23 ,  H04L7/06

    CPC分类号： H04L7/08 ,  H04B3/235 ,  H04B3/238 ,  H04L2007/047

    摘要： In a data transmission system data is sent, after suitable conversion, as a ternary analogue type signal. Using two-wire twisted pairs and hybrids, echo cancellation and feedback equalisation are provided.
    Synchronisation between the two ends, e.g. of a 144 Kb/sec. subscriber's loop is maintained by a low amplitude pilot tone sent with the data, which is detected at the same time as the data is detected. Detection and elimination of this pilot tone use coefficient generation circuitry similar to those used in the equaliser and echo canceller.
    To reduce the effect of time phase steps on the system performance in addition to the transmission of a specific zero valued frame synchronisation word which immediately precedes the phase step, the incoming synchronisation word is also aligned to this time so that the value of a symbol as received can be predicted, as for a synchronisation word, the predicted value is given preference if there is a difference between that symbol's value as received and its predicted value. In addition, the location of the high-pass filters used in the system are specified, alternative methods of bit timing control are specified and advantageous realisations of the canceller and equaliser using tap interpolation are disclosed.

    摘要翻译： 在数据传输系统中，数据在经过适当转换后作为三元模拟类型信号发送。 使用双线双绞线和混合电路，提供回声消除和反馈均衡。 两端之间的同步，例如， 为144 Kb /秒。 用户的回路由与数据一起发送的低幅度导频音来维持，该数据在检测到数据的同时被检测到。 这种导频音使用系数生成电路的检测和消除与在均衡器和回声消除器中使用的系统生成电路类似。 为了减少时间相位步长对系统性能的影响，除了发送紧接在相位步之前的特定的零值帧同步字外，输入的同步字也与此时间对齐，使得符号的值为 对于同步字，接收可以被预测，如果在所接收的该符号的值与其预测值之间存在差异，则给予预测值优先。 此外，规定了系统中使用的高通滤波器的位置，规定了位定时控制的替代方法，并公开了使用抽头插值的消除器和均衡器的有利实现。