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    • 42. 发明授权
    • Rotary lawn mower accessories
    • 旋转割草机配件
    • US4715173A
    • 1987-12-29
    • US741111
    • 1985-06-04
    • James Anderson
    • James Anderson
    • A01D34/73A01D42/00A01D55/00
    • A01D42/00A01D34/733A01D2101/00Y10S56/09
    • The invention provides accessories for use with a rotary lawn mower in which the conventional bar having oppositely facing cutting edges is replaced with an accessory bar to which a variety of grass grooming accessories can be easily attached. The accessory bar can accommodate replaceable grass cutting elements, grass mulching elements and lawn power raking elements. The elements can be replaced without removing the accessory bar from the mower and are balanced to reduce vibration. Two of the accessories have cutting edges which are factory sharpened on relatively low cost elements, and thus can be discarded when blunt and replaced with new, low cost factory sharpened elements, thus maintaining balance. The rake accessory has a variation which permits a fine adjustment of vertical height of the rake above the lawn, to accommodate lawn mowers having coarse or no height adjustment.
    • 本发明提供了一种用于旋转割草机的附件,其中具有相对面切割刃的常规杆被替换为可容易地附着各种草地修饰附件的附件杆。 附件酒吧可以容纳可更换的草切割元素,草地覆盖元素和草坪动力耙子。 可以更换元件,而不需要从割草机上取下附件杆,并平衡以减少振动。 其中两个配件具有在相对较低成本的元件上工厂削尖的切削刃,因此可以在钝的时候被丢弃,并用新的低成本的工厂磨削元件代替,从而保持平衡。 耙子配件具有允许对草坪上方的耙的垂直高度进行微调的变化,以适应具有粗糙或没有高度调节的割草机。
    • 43. 发明授权
    • Photographic distortion method and apparatus
    • 摄影失真方法和装置
    • US4390272A
    • 1983-06-28
    • US288049
    • 1981-07-29
    • James Anderson
    • James Anderson
    • G03B27/10
    • G03B27/10
    • A method and apparatus for obtaining a distorted photographic reproduction from a negative photographic image, in which a sheet of photosensitive printing paper is attached to a planar surface of a table, the image negative is placed over the paper and a slitted mask is placed over the image negative. The image negative and the mask are moved laterally relative to one another and to the paper while the mask is exposed to a light source. To obtain a circular reproduction the mask is held stationary and the printing paper is rotated about an axis intersecting the slit while the image negative is moved laterally with respect to the slit.
    • 一种用于从负照相图像获得失真的照相再现的方法和装置,其中将一张光敏打印纸附接到桌子的平面表面,将图像负片放置在纸上,并将切割的掩模放置在 图像为负。 当掩模暴露于光源时,图像负片和掩模相对于彼此和纸张横向移动。 为了获得圆形再现,掩模保持静止,并且打印纸围绕与狭缝相交的轴线旋转,同时图像负片相对于狭缝横向移动。
    • 45. 发明授权
    • Analog power amplifier predistortion methods and apparatus
    • 模拟功率放大器预失真方法和装置
    • US08693962B2
    • 2014-04-08
    • US12203064
    • 2008-09-02
    • Dongtai LiuDali YangJames Anderson
    • Dongtai LiuDali YangJames Anderson
    • H04B1/04
    • H04B1/0475H03F1/3247H03F3/19H03F3/21H03F3/24H03F2200/451H03F2200/57H03F2201/3215H03F2201/3233H04B2001/0425Y02D70/00
    • An embodiment of the invention is a predistortion approach to linearize a power amplifier by using one or more analog multiplier(s) and a DSP-based processor. For the analog embodiment, the inherent nature of the analog circuitries allows digital predistortion processing structured directly at the RF band, and enables a single power amplifier to support multi-modulation schemes, multi-carriers and multi-channels. As a result, the predistortion architecture is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems. The wireless system performance can be improved and upgraded just by using the new PA module rather than change or rebuild new subsystem in existing base station. The analog embodiment can also mix and match its analog multipliers with other analog components such as phase splitters, phase shifters, attenuators, filters, couplers, mixers, low-noise amplifiers, buffers, envelope detectors, and etc., to provide additional features.
    • 本发明的一个实施例是通过使用一个或多个模拟乘法器和基于DSP的处理器对功率放大器进行线性化的预失真方法。 对于模拟实施例,模拟电路的固有特性允许直接在RF频带处构成的数字预失真处理,并且使单个功率放大器能够支持多调制方案,多载波和多信道。 因此,预失真架构特别适用于诸如基站,中继器和室内信号覆盖系统之类的无线传输系统。 无线系统性能可以通过使用新的PA模块来改进和升级,而不是改变或重建现有基站中的新子系统。 模拟实施例还可以将其模拟乘法器与诸如相位分离器,移相器,衰减器,滤波器,耦合器,混频器,低噪声放大器,缓冲器,包络检测器等的其它模拟组件混合并匹配,以提供附加特征。
    • 50. 发明授权
    • Power amplifier predistortion methods and apparatus using envelope and phase detector
    • 功率放大器预失真方法和使用包络和相位检测器的装置
    • US08224266B2
    • 2012-07-17
    • US12203076
    • 2008-09-02
    • Dongtai LiuDali YangJames Anderson
    • Dongtai LiuDali YangJames Anderson
    • H04B1/04
    • H03F3/24H03F1/3241H03F1/3247H03F1/3282H03F1/3294H03F2200/102H03F2200/192H03F2200/204H03F2200/321H03F2200/336H03F2201/3233H04B2001/0425
    • An embodiment of the invention is a predistortion approach to linearize a power amplifier without frequency conversion of the RF signals by using envelope and phase detectors to detect the error to be corrected, and then one or more analog multiplier(s) and a DSP-based processor. For the analog embodiment, the inherent nature of the analog circuitries allows digital predistortion processing structured directly at the RF band, and enables a single power amplifier to support multi-modulation schemes, multi-carriers and multi-channels. As a result, the predistortion architecture is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems. The wireless system performance can be improved and upgraded just by using the new PA module rather than change or rebuild new subsystem in existing base station. The analog embodiment can also mix and match its analog multipliers with other analog components such as phase splitters, phase shifters, attenuators, filters, couplers, mixers, low-noise amplifiers, buffers, envelope detectors, and etc., to provide additional features.
    • 本发明的一个实施例是通过使用包络和相位检测器来检测待校正的误差,然后一个或多个模拟乘法器和基于DSP的模拟乘法器来对功率放大器进行线性化而不对RF信号进行频率转换的预失真方法 处理器。 对于模拟实施例,模拟电路的固有特性允许直接在RF频带处构成的数字预失真处理,并且使单个功率放大器能够支持多调制方案,多载波和多信道。 因此,预失真架构特别适用于诸如基站,中继器和室内信号覆盖系统之类的无线传输系统。 无线系统性能可以通过使用新的PA模块来改进和升级,而不是改变或重建现有基站中的新子系统。 模拟实施例还可以将其模拟乘法器与诸如相位分离器,移相器,衰减器,滤波器,耦合器,混频器,低噪声放大器,缓冲器,包络检测器等的其它模拟组件混合并匹配,以提供附加特征。