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1. 发明授权

US09634878B1 Systems and methods for data transfer using self-synchronizing quadrature amplitude modulation (QAM) 有权
公开(公告)号：US09634878B1
公开(公告)日：2017-04-25
申请号：US13609196
申请日：2012-09-10
申请人： Stephanie M. Bench , Roger B. Shaffer , Mark S. Olsson
发明人： Stephanie M. Bench , Roger B. Shaffer , Mark S. Olsson
IPC分类号： H04L27/34
CPC分类号： H04L27/34 , G01M3/00 , H04L27/3405 , H04L27/3455
摘要： Quadrature Amplitude Modulation (QAM) methods, apparatus, and systems including a QAM transmit modulator to generate an output signal using a two-dimensional (2-D) QAM symbol constellation is disclosed.

2. 发明授权

US09927368B1 Self-leveling inspection systems and methods 有权
公开(公告)号：US09927368B1
公开(公告)日：2018-03-27
申请号：US13358463
申请日：2012-01-25
申请人： Mark S. Olsson , Roger B. Shaffer , Stephanie M. Bench , Ray Merewether , Michael Martin , David A. Cox
发明人： Mark S. Olsson , Roger B. Shaffer , Stephanie M. Bench , Ray Merewether , Michael Martin , David A. Cox
IPC分类号： H04N7/18 , H04B3/36 , G01N21/88 , G01M3/24 , F16L55/28 , H04N5/232
CPC分类号： G01N21/8803 , F16L55/28 , F16L2101/30 , G01M3/246 , H04N5/2259 , H04N5/232 , H04N5/23258 , H04N5/23267
摘要： Self-leveling inspection systems for use in inspecting buried pipes or other cavities are disclosed. A camera head may include an image sensor, an orientation sensing module, and an image processing module configured to adjust an image or video provided from the image sensor, based at least in part on information provided from the orientation sensor, in the camera head.

3. 发明授权

US09571326B2 Method and apparatus for high-speed data transfer employing self-synchronizing quadrature amplitude modulation 有权
标题翻译：采用自同步正交幅度调制的高速数据传输方法和装置
公开(公告)号：US09571326B2
公开(公告)日：2017-02-14
申请号：US12715684
申请日：2010-03-02
申请人： Stephen M. Bench , Roger B. Shaffer
发明人： Stephen M. Bench , Roger B. Shaffer
IPC分类号： H04N7/12 , H04L27/36 , H04L27/34 , H04L27/38
CPC分类号： H04L27/362 , H04L27/3455 , H04L27/3818
摘要： A Quadrature Amplitude Modulation (QAM) method and apparatus including a QAM transmit modulator with at least one unbalanced mixer, which creates an asymmetric two-dimensional (2-D) QAM symbol constellation. The asymmetrical symbol constellation provides baseband symbol clock signal leakage sufficient to facilitate quick and simple baseband symbol clock recovery and signal channel compensation at the QAM receiver without significantly degrading the system bit-error rate (BER). While slightly degrading static BER, overall system performance is improved when considering baseband symbol clock recovery and received signal compensation for an imperfect signal channel. This allows QAM to be deployed in systems where QAM is otherwise prohibitively expensive and improves overall system performance for any existing QAM system application without additional bandwidth, cost or complexity.
摘要翻译：一种正交幅度调制（QAM）方法和装置，其包括具有至少一个不平衡混频器的QAM发射调制器，其产生不对称二维（2-D）QAM符号星座。不对称符号星座提供足够的基带符号时钟信号泄漏，以便于在QAM接收机上快速简单的基带符号时钟恢复和信号信道补偿，而不会显着降低系统误码率（BER）。在考虑基带符号时钟恢复和不完美信号通道的接收信号补偿的同时，静态BER略有降低，整体系统性能得到改善。这样就可以将QAM部署在其他QAM价格昂贵的系统中，并且可以提高任何现有QAM系统应用的整体系统性能，而无需额外的带宽，成本或复杂性。

4. 发明申请

US20100225752A1 Method and apparatus for high-speed data transfer employing self-synchronizing quadrature amplitude modulation 有权
标题翻译：采用自同步正交幅度调制的高速数据传输方法和装置
公开(公告)号：US20100225752A1
公开(公告)日：2010-09-09
申请号：US12715684
申请日：2010-03-02
申请人： Stephen M. Bench , Roger B. Shaffer
发明人： Stephen M. Bench , Roger B. Shaffer
IPC分类号： H04L27/34 , H04N7/18
CPC分类号： H04L27/362 , H04L27/3455 , H04L27/3818
摘要： A Quadrature Amplitude Modulation (QAM) method and apparatus including a QAM transmit modulator with at least one unbalanced mixer, which creates an asymmetric two-dimensional (2-D) QAM symbol constellation. The asymmetrical symbol constellation provides baseband symbol clock signal leakage sufficient to facilitate quick and simple baseband symbol clock recovery and signal channel compensation at the QAM receiver without significantly degrading the system bit-error rate (BER). While slightly degrading static BER, overall system performance is improved when considering baseband symbol clock recovery and received signal compensation for an imperfect signal channel. This allows QAM to be deployed in systems where QAM is otherwise prohibitively expensive and improves overall system performance for any existing QAM system application without additional bandwidth, cost or complexity.
摘要翻译：一种正交幅度调制（QAM）方法和装置，其包括具有至少一个不平衡混频器的QAM发射调制器，其产生不对称二维（2-D）QAM符号星座。不对称符号星座提供足够的基带符号时钟信号泄漏，以便于在QAM接收机上快速简单的基带符号时钟恢复和信号信道补偿，而不会显着降低系统误码率（BER）。在考虑基带符号时钟恢复和不完美信号通道的接收信号补偿的同时，静态BER略有降低，整体系统性能得到改善。这样就可以将QAM部署在其他QAM价格昂贵的系统中，并且可以提高任何现有QAM系统应用的整体系统性能，而无需额外的带宽，成本或复杂性。

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