公开(公告)号：US5436598A

公开(公告)日：1995-07-25

申请号：US184687

申请日：1994-01-21

申请人： Andrew M. Harris

发明人： Andrew M. Harris

IPC分类号： H03L7/081 ,  H03L7/06

CPC分类号： H03L7/081

摘要： A phase lock loop (PLL) circuit which includes an input for inputting an incoming signal which is to be tracked, a phase lock loop subcircuit, a phase state indicator subcircuit, and a synchronized blanking window generator. These elements create a phase lock loop circuit capable of producing a stable output which closely tracks the incoming signal, even when the incoming signal shifts in phase by 180 degrees. The phase state indicator subcircuit detects a phase reversal in the incoming signal and outputs a signal indication such. This indicating signal is used by the phase lock loop subcircuit to produce a stable reference signal tracking the incoming signal most of the time. However, during a short period of time between the inversion of the incoming signal and the output of the indicating signal by the phase state indicator subcircuit, the synchronized blanking window generator provides a signal to the phase lock loop subcircuit which is used to stabilize the reference signal.

摘要翻译： 一种锁相环（PLL）电路，包括用于输入待跟踪的输入信号的输入端，锁相环子电路，相位状态指示器子电路和同步消隐窗发生器。 这些元件产生一个锁相环电路，即使在输入信号相移180度时，也能产生一个稳定的输出，该输出密切跟踪输入信号。 相位状态指示器子电路检测输入信号中的相位反转，并输出信号指示。 该指示信号由相位锁回路子电路使用，以产生大部分时间跟踪输入信号的稳定参考信号。 然而，在通过相位状态指示器子电路输入信号的反相和指示信号的输出之间的短时间段内，同步的消隐窗口生成器为锁相环子电路提供信号，该信号用于稳定参考 信号。

公开(公告)号：US5408055A

公开(公告)日：1995-04-18

申请号：US140841

申请日：1993-10-25

申请人： Andrew M. Harris ,  James Watson

发明人： Andrew M. Harris ,  James Watson

IPC分类号： G06F3/033 ,  G06F3/046 ,  G08C21/00

CPC分类号： G06F3/046

摘要： A device for indicating the phase of the a full-frequency alternating current (AC) magnetic field signal transmitting from the pointing device of a cordless digitizer and for determining if the phase of a half-frequency alternating current (AC) magnetic field signal transmitting from the pointing device is approximately the same or approximately inverted from an immediately preceding half-frequency signal from the pointing device. The indication of the phase of the full-frequency pointing device signal is used by the digitizer logic circuits to determine the location of the pointing device on the tablet's sensing surface. The information concerning the change in phase of the half-frequency signal is used by the digitizer logic circuits to decode the status of various pointing device buttons. If the phase in the induced half-frequency signal is unchanged from the last, this no-change condition represents one binary state. If the phase has changed, the condition represents the other binary state. Accordingly, a binary encoded message may be transferred from the pointing device to the digitizer tablet for decoding via this phase change method.

摘要翻译： 一种用于指示从无绳数字转换器的指示装置发送的全频交流（AC）磁场信号的相位的装置，用于确定是否从半频交流（AC）磁场信号 指示装置与来自指示装置的紧邻的前一个半频信号大​​致相同或近似地反转。 数字化仪逻辑电路使用全频点指示设备信号的相位指示来确定指示设备在平板电脑感应表面上的位置。 数字转换器逻辑电路使用关于半频信号的相位变化的信息来解码各种指示设备按钮的状态。 如果感应半频信号的相位与最后一个相位不变，则该无变化状态表示一个二进制状态。 如果相位发生变化，则条件代表另一个二进制状态。 因此，二进制编码消息可以从指示设备传送到数字化仪平板电脑，以经由该相变方法进行解码。