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    • 2. 发明授权
    • Phase-locked loop FM demodulator
    • 锁相环FM解调器
    • US5140278A
    • 1992-08-18
    • US667005
    • 1991-03-11
    • Harold KirkhamShannon P. Jackson
    • Harold KirkhamShannon P. Jackson
    • H03L7/091
    • H03L7/091
    • A conventional phase-locked loop is improved by replacing its phase detector with one comprising a linear ramp generator and a sample-and-hold circuit, thus eliminating the need for a lowpass loop filter, although the output of the sample-and-hold circuit may be filtered in the case of a very low level modulating signal on the incoming FM signal, but then filtering is not a difficult problem as in a conventional phase-locked loop. The result is FM demodulation by zero-order estimation. For FM demodulation by first-order estimation, the arithmetic difference between adjacent samples is formed, and using a second sample-and-hold circuit an arithmetic difference signal is produced as an input to a second ramp generator that is reset after each sampling cycle to generate a ramp the slope of which is a function of the arithmetic difference signal stored in the second sample-and-hold circuit. The ramp thus generated by the second ramp generator is arithmetically summed with the zero-estimation signal from the first sample-and-hold circuit to form a first-order estimation signal. Filtering such a first-order estimation signal is less of a problem than filtering a zero-order estimation signal.
    • 通过用包括线性斜坡发生器和采样保持电路的相位检测器代替其相位检测器来改进传统的锁相环,因此消除了对低通环路滤波器的需要,尽管采样保持电路的输出 在传入的FM信号上的低电平调制信号的情况下,滤波器可以被滤波,但是在常规的锁相环中滤波并不是一个困难的问题。 结果是通过零阶估计的FM解调。 对于通过一阶估计的FM解调,形成相邻采样之间的算术差异,并且使用第二采样和保持电路,产生算术差分信号作为在每个采样周期之后被复位的第二斜坡发生器的输入, 产生斜坡,其斜率是存储在第二采样保持电路中的算术差信号的函数。 由第二斜坡发生器产生的斜坡与来自第一采样保持电路的零估计信号进行算术求和,以形成一阶估计信号。 过滤这样的一阶估计信号比过滤零阶估计信号的问题更少。
    • 5. 发明授权
    • Sensor web
    • 传感器网
    • US07925469B2
    • 2011-04-12
    • US11514458
    • 2006-09-01
    • Kevin A. DelinShannon P. Jackson
    • Kevin A. DelinShannon P. Jackson
    • G04G7/00
    • H04W56/001G01D21/00H04J3/0641H04W40/24H04W84/18
    • A Sensor Web formed of a number of different sensor pods. Each of the sensor pods include a clock which is synchronized with a master clock so that all of the sensor pods in the Web have a synchronized clock. The synchronization is carried out by first using a coarse synchronization which takes less power, and subsequently carrying out a fine synchronization to make a fine sync of all the pods on the Web. After the synchronization, the pods ping their neighbors to determine which pods are listening and responded, and then only listen during time slots corresponding to those pods which respond.
    • 传感器网由许多不同的传感器盒组成。 每个传感器盒包括与主时钟同步的时钟,使得Web中的所有传感器盒具有同步时钟。 通过首先使用较少功率的粗略同步来执行同步,并且随后执行精细同步以使得Web上的所有pod的精细同步。 在同步之后,pod会ping其邻居以确定哪些pod正在侦听和响应,然后只在与响应的那些pod相对应的时隙内侦听。