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    • 3. 发明授权
    • System and method for subtracting dither reference during analog-to-digital conversion
    • 用于在模数转换期间减去抖动参考的系统和方法
    • US07277033B1
    • 2007-10-02
    • US11352636
    • 2006-02-13
    • Jeffrey J. Kriz
    • Jeffrey J. Kriz
    • H03M1/20
    • H03M1/06H03M1/0641H03M1/1038H03M1/365
    • A system and method directed to using a dither signal during conversion of an analog input signal to a digital output signal without summing the dither signal to the analog input signal. Such conversion may include generating a digital dither signal with a pseudo-random noise generator and converting the digital dither signal to an analog dither signal. The analog dither signal is provided to an impedance network that responsively produces a set of reference dither signals proportional to the analog dither signal. A plurality of comparators compares the proportional dither signals to the analog input signal so as to generate a first output code. A dither signal reference code that indicates the effects of passing the dither signal through the analog-to-digital converter is subtracted from the first output code so as to produce a second output code that is a digital representation of the analog input signal.
    • 一种系统和方法,其特征在于,在将模拟输入信号转换成数字输出信号而将抖动信号与模拟输入信号相加时,使用抖动信号。 这种转换可以包括用伪随机噪声发生器产生数字抖动信号,并将数字抖动信号转换为模拟抖动信号。 模拟抖动信号被提供给阻抗网络,其响应地产生与模拟抖动信号成比例的一组参考抖动信号。 多个比较器将比例抖动信号与模拟输入信号进行比较,以产生第一输出码。 从第一输出代码中减去指示通过模数转换器传送抖动信号的影响的抖动信号参考码,以产生作为模拟输入信号的数字表示的第二输出代码。
    • 4. 发明授权
    • Multi tier wireless communication system
    • 多层无线通信系统
    • US07027416B1
    • 2006-04-11
    • US08941963
    • 1997-10-01
    • Jeffrey J. Kriz
    • Jeffrey J. Kriz
    • H04Q7/00
    • H04L12/2834G01D21/00G08B3/1083G08B25/009G08B25/10H04L12/2803H04L12/2827H04L29/06H04L67/12H04L69/329H04L2012/2841H04L2012/2845H04M11/04H04W24/00H04W40/22H04W48/08H04W48/16H04W84/18
    • A monitoring system is provided with a two tier communication network. Multiple first tier nodes comprising wireless or RF sensors are each equipped with transceivers operating at a first, low power level. Multiple second tier nodes are spaced to communicate with selected sensors at the lower bandwidth level, and also communicate with each other at a higher power level and higher bandwidth, to route sensor communications to a central controller. The sensors comprise standard home and small business sensors such as motion detectors, glass breakage, pressure, temperature, humidity and carbon monoxide sensors to name a few, each equipped with a transceiver. The sensors are placed throughout a structure to be protected or monitored. Since such structures can be quite large, several second tier routers are provided such that at least one is within range of each sensor to receive its low power signals. A routing table is dynamically generated to direct communications between routers and the controller
    • 监控系统设有两层通信网络。 包括无线或RF传感器的多个第一层节点都配备有以第一低功率水平操作的收发器。 多个第二层节点被间隔开以在较低带宽水平下与选定的传感器通信,并且还以更高的功率水平和更高的带宽彼此通信,以将传感器通信路由到中央控制器。 这些传感器包括标准的家用和小型商业传感器,例如运动检测器,玻璃破碎,压力,温度,湿度和一氧化碳传感器,其中仅举几例,每个都配备有收发器。 传感器放置在要保护或监控的结构中。 由于这种结构可能相当大,所以提供了几个第二层路由器,使得至少一个在每个传感器的范围内以接收其低功率信号。 动态生成路由表以指导路由器与控制器之间的通信
    • 5. 发明授权
    • Narrowband based navigation scheme
    • 基于窄带的导航方案
    • US06300904B1
    • 2001-10-09
    • US09328472
    • 1999-06-09
    • Mark D. DvorakJeffrey J. KrizBrian W. Schipper
    • Mark D. DvorakJeffrey J. KrizBrian W. Schipper
    • G01S302
    • G01S5/12G01S13/878
    • Multiple pulses of narrow band signals of varying frequency are detected by multiple spaced apart receivers such that average time difference of arrivals of the signals from an item to be located are determined. The average time differences are used to calculate a position of the item to be located with a desired accuracy, such as within one meter in one embodiment. One of multiple receivers or rangers initiates a location process by transmitting a sync pulse. The sync pulse is received by a scout and other rangers. The scout is a small robot which acts as a transponder, sending out its own narrow band return pulse in response to the sync pulse. Each ranger then determines a difference in time between the sync pulse it receives and the return pulse generated by the scout. The location process is then repeated again at different selected narrow band frequencies, and an average of the difference in time at each ranger is determined. Each ranger is networked together via a standard wireless network, and also obtains position information via standard GPS methods. An iterative calculation of the location of the scout is used to improve an estimated position solution. Time difference of arrival between two rangers is expressed as an equation with three unknown variables, x, y and z, which define a position of the scout in three dimensional space. The locus of a point that satisfies this equation is hyperbolic. The iterative calculation uses a least squares approach to improve the estimated position to within a required tolerance.
    • 通过多个间隔开的接收器检测变化频率的窄带信号的多个脉冲,从而确定来自待定位物品的信号到达的平均时间差。 在一个实施例中,使用平均时间差来计算要以所需精度定位的物品的位置,例如在一米内。 多个接收器或巡航者之一通过发送同步脉冲来发起位置处理。 同步脉冲由侦察兵和其他护林员接收。 侦察兵是作为应答器的小型机器人,响应于同步脉冲发出自己的窄带返回脉冲。 然后,每个游侠确定其接收的同步脉冲与由侦察器产生的返回脉冲之间的时间差。 然后在不同的选择的窄带频率处再次重复定位处理,并且确定每个游侠的时间差的平均值。 每个游侠通过标准无线网络联网在一起,并通过标准的GPS方式获取位置信息。 使用侦察器的位置的迭代计算来改善估计的位置解。 两个护林员之间的到达时差表示为具有三个未知变量x,y和z的方程,其定义了三维空间中侦察兵的位置。 满足该方程的点的轨迹是双曲线的。 迭代计算使用最小二乘法将估计位置提高到所需的公差范围内。