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    Receiver and method for receiving FSK signals
    1.
    发明公开
    Receiver and method for receiving FSK signals 失效
    Empfängerund Verfahren zum Empfangen eines FSK-Signal

    公开(公告)号：EP1051004A2

    公开(公告)日：2000-11-08

    申请号：EP00115544.9

    申请日：1992-08-24

    申请人： INTERNATIONAL CONTROL AUTOMATION FINANCE S.A.

    发明人： Baker, William E.

    IPC分类号： H04L27/156

    CPC分类号： H04L27/1563 ,  H04L27/122

    摘要： A digital FSK receiver includes a zero-crossing detector which detects the zero crossings in an FSK signal (FSK IN) having at least two frequencies. The time interval between zero crossings is then measured with a first interval value corresponding to one of the signal frequencies and a second interval value corresponding to the other signal frequency. An accumulator outputs a digital signal (RCVNR2) which depends on whether the interval is at the first value or the second value, the digital signal including logical zeros and ones.

    摘要翻译： 数字FSK接收机包括过零检测器，其检测具有至少两个频率的FSK信号（FSK IN）中的过零点。 然后用对应于信号频率之一的第一间隔值和对应于另一信号频率的第二间隔值来测量过零点之间的时间间隔。 累加器输出数字信号（RCVNR2），取决于间隔是第一个值还是第二个值，数字信号包括逻辑0和1。

    Methods and apparatus for obtaining process characteristics in selftuning controllers
    6.
    发明公开
    Methods and apparatus for obtaining process characteristics in selftuning controllers 失效
    的方法和装置，用于获得一个过程，这是由自调谐控制器控制的参数。

    公开(公告)号：EP0571080A1

    公开(公告)日：1993-11-24

    申请号：EP93302922.5

    申请日：1993-04-15

    申请人： INTERNATIONAL CONTROL AUTOMATION FINANCE S.A.

    发明人： Molnar, Richard J.

    IPC分类号： G05B23/02

    CPC分类号： G05B13/0205

    摘要： The characteristics of a field process system (13) controlled by a self tuning controller (10) are obtained by analyzing the open loop response of the process variable (PV) to a step applied at the controller's control output (11). A first-order system response with pure time delay is used to approximate a higher-order field process system's actual response. The overall deadtime and time constant of the first-order approximation are determined. The maximum slope of the process variable response to the step is stored along with an assigned time of its occurrence and an assigned process variable. The stored information is used to approximate the overall deadtime. In one embodiment the stored information is assumed to be the data obtained from a second-order response having a 10:1 time constant ratio and is used to find the assumed second-order time constants which are used to find the first-order time constant. In a second embodiment the first order time constant is determined by using a convergence point falling within a predetermined range between the actual response data and the first-order approximation. The step is not applied to the control output (11) until the process variable has reached the initial steady state condition and the calculation of slope ceases when the process variable response reaches the final steady state condition. Alternative techniques are disclosed for determining the steady state condition.

    摘要翻译： 由自调谐控制器（10）控制的现场过程系统（13）的特性，通过分析过程变量（PV），以在控制器的控制输出（11）施加的步骤的开环响应得到。 与纯的时间延迟一阶系统响应来近似一个高阶现场过程系统的实际响应。 的一阶近似的总停滞时间和时间常数是确定性的开采。 到步骤过程变量响应的最大斜率被存储地连同在其发生的分配时间和分配的过程变量。 所存储的信息来近似总停滞时间。 在一个实施例中，假设所存储的信息，以便从具有10的第二阶响应所获得的数据：1的时间常数比和用于发现哪些是用于查找一阶时间常数的假定二阶时间常数 ， 在第二实施例的一阶时间常数，通过使用会聚点落在实际响应数据和所述一阶近似之间的预定范围内确定的开采。 步骤没有被施加到控制输出（11），直到过程变量已经达到初始稳定状态和斜率的计算停止时所述过程变量响应达到最终稳态条件。 另一种技术是游离缺失盘确定性采矿稳态条件。