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热词
    • 2. 发明授权
    • System and method for selectively providing security to and transmission power from a portable electronic device depending on a distance between the device and a user
    • 用于根据设备和用户之间的距离选择性地提供来自便携式电子设备的安全性和传输功率的系统和方法
    • US08077032B1
    • 2011-12-13
    • US11745148
    • 2007-05-07
    • Bradford Edward VierTodd Winfield Steigerwald
    • Bradford Edward VierTodd Winfield Steigerwald
    • G08B1/08
    • G08B13/2491G08B13/26
    • A portable electronic device is provided for sending and receiving a communication signal to and from a target, respectively. Among other components, the portable electronic device includes an antenna, a transceiver, a signal processing system and control circuitry. The signal processing system determines a distance between the target and the portable electronic device. There are various ways to determine the relative distance between the target and the device. One such methodology is to use a change in a signal that is transmitted from the transceiver and reflected from the target back to the transceiver. The change can be a frequency shift, a phase shift, a capacitive coupling change, an impedance change, or any other change which notes the presence of a target relative to the transceiver. The control circuitry may be used to change the amount of power applied to the antenna and/or to change at least one security measure of the device depending on the distance detected between the target and the device.
    • 提供便携式电子设备,用于分别向目标发送和接收来自目标的通信信号。 在其他组件中,便携式电子设备包括天线,收发器,信号处理系统和控制电路。 信号处理系统确定目标和便携式电子设备之间的距离。 有多种方式来确定目标和设备之间的相对距离。 一种这样的方法是使用从收发器发射并从目标反射回收发信机的信号的改变。 该变化可以是频移,相移,电容耦合变化,阻抗变化,或者任何其他注意到相对于收发器的目标的存在的变化。 控制电路可以用于根据在目标和设备之间检测到的距离来改变施加到天线的功率量和/或改变设备的至少一个安全措施。