公开(公告)号：US5913823A

公开(公告)日：1999-06-22

申请号：US893150

申请日：1997-07-15

申请人： David J. Hedberg ,  Stuart L. Carp ,  Stirling S. Dodd ,  Samual H. Maslak ,  Bhaskar S. Ramamurthy ,  Daniel E. Need ,  John A. Hossack

发明人： David J. Hedberg ,  Stuart L. Carp ,  Stirling S. Dodd ,  Samual H. Maslak ,  Bhaskar S. Ramamurthy ,  Daniel E. Need ,  John A. Hossack

IPC分类号： A61B8/00 ,  A61B8/08 ,  G01S7/52

CPC分类号： G01S7/52038 ,  A61B8/08 ,  A61B8/4281 ,  G01S7/52046

摘要： An improvement to the method for harmonic imaging including the steps of (a) transmitting ultrasonic energy at a fundamental frequency and (b) receiving reflected ultrasonic energy at a harmonic of the fundamental frequency is provided. For the improvement, the transmitting step includes the step of transmitting a uni-polar waveform or a waveform characterized by an amplitude change rate of 8 or fewer times pre carrier cycle, said waveform comprising an envelope shape rising gradually to a respective maximum value and falling gradually from the respective maximum value.

摘要翻译： 提供了一种对谐波成像方法的改进，包括以下步骤：（a）以基频传输超声波能量;（b）在基频谐波处接收反射的超声波能量。 为了改进，发送步骤包括发送单极波形或以载波周期为8以下的振幅变化率为特征的波形的步骤，所述波形包括逐渐上升到相应的最大值的包络形状，并且下降 逐渐从各自的最大值。

公开(公告)号：US06221018B1

公开(公告)日：2001-04-24

申请号：US09634115

申请日：2000-08-08

申请人： Bhaskar S. Ramamurthy ,  Charles Bradley ,  Ken Sawatari ,  Danhua Zhao ,  Stuart L. Carp ,  Stirling S. Dodd ,  David J. Hedberg ,  Samuel H. Maslak ,  Daniel E. Need

发明人： Bhaskar S. Ramamurthy ,  Charles Bradley ,  Ken Sawatari ,  Danhua Zhao ,  Stuart L. Carp ,  Stirling S. Dodd ,  David J. Hedberg ,  Samuel H. Maslak ,  Daniel E. Need

IPC分类号： A61B800

CPC分类号： A61B8/481 ,  G01S7/5202 ,  G01S7/52038 ,  G01S15/8915 ,  G01S15/8927 ,  G01S15/895

摘要： A medical diagnostic ultrasonic imaging method and system subdivide the transmit aperture into two or more subapertures, each subaperture having at least four adjacent transducer elements. The subapertures are phased differently with respect to one another to selectively reduce either fundamental components or harmonic components of echoes from tissue. These techniques can be used to improve contrast agent harmonic imaging as well as tissue harmonic imaging, depending upon the phase shift selected.

摘要翻译： 医学诊断超声成像方法和系统将发射孔径细分为两个或更多个子孔径，每个子孔径具有至少四个相邻的换能器元件。 子孔径相对于彼此不同地相位选择性地降低来自组织的回波的基本分量或谐波分量。 这些技术可以用于根据选择的相移来改善造影剂谐波成像以及组织谐波成像。

公开(公告)号：US06193659B1

公开(公告)日：2001-02-27

申请号：US09282397

申请日：1999-03-31

申请人： Bhaskar S. Ramamurthy ,  Charles Bradley ,  Ken Sawatari ,  Danhua Zhao ,  Stuart L. Carp ,  Stirling S. Dodd ,  David J. Hedberg ,  Samuel H. Maslak ,  Daniel E. Need

发明人： Bhaskar S. Ramamurthy ,  Charles Bradley ,  Ken Sawatari ,  Danhua Zhao ,  Stuart L. Carp ,  Stirling S. Dodd ,  David J. Hedberg ,  Samuel H. Maslak ,  Daniel E. Need

IPC分类号： A61B800

CPC分类号： A61B8/481 ,  G01S7/5202 ,  G01S7/52038 ,  G01S15/8915 ,  G01S15/8927 ,  G01S15/895

摘要： An improvement to the method for harmonic imaging including the steps of (a) transmitting ultrasonic energy at a fundamental frequency and (b) receiving reflected ultrasonic energy at a harmonic of the fundamental frequency is provided. The transmitting step includes the step of: applying the plurality of waveforms to a respective plurality of transducer elements, a first waveform of the plurality of waveforms characterized by a first value of a harmonic power ratio, waveforms transmitted from the transducer elements and corresponding to the plurality of waveforms summing as an acoustic waveform substantially at the point, the acoustic waveform characterized by a second value of the harmonic power ratio less than the first value. The imaging method can also include a step for subdividing the transmit aperture into two or more subapertures, each subaperture having at least four adjacent transducer elements. The subapertures are phased differently with respect to one another to selectively reduce either fundamental components or harmonic components of echoes from tissue. These techniques can be used to improve contrast agent harmonic imaging as well as tissue harmonic imaging, depending upon the phase shift selected.

摘要翻译： 提供了一种对谐波成像方法的改进，包括以下步骤：（a）以基频传输超声波能量;（b）在基频谐波处接收反射的超声波能量。 发送步骤包括以下步骤：将多个波形应用于相应的多个换能器元件，所述多个波形的第一波形以谐波功率比的第一值为特征，从换能器元件发送的波形对应于 多个波形基本上在该点处作为声波形求和，声波特征在于小于第一值的谐波功率比的第二值。 成像方法还可以包括将发射孔分成两个或更多个子孔径的步骤，每个子孔径具有至少四个相邻的换能器元件。 子孔径相对于彼此不同地相位选择性地降低来自组织的回波的基本分量或谐波分量。 这些技术可以用于根据选择的相移来改善造影剂谐波成像以及组织谐波成像。

公开(公告)号：US4435734A

公开(公告)日：1984-03-06

申请号：US320620

申请日：1981-11-12

申请人： David J. Hedberg ,  C. Gary Nilsson

发明人： David J. Hedberg ,  C. Gary Nilsson

IPC分类号： G11B20/06 ,  H04N5/92 ,  H04N7/22 ,  H04N5/91 ,  G11B5/04 ,  H04N5/76 ,  H04N9/491

CPC分类号： H04N5/92 ,  G11B20/06 ,  H04N7/22

摘要： High resolution video signals of bandwidth up to 25 mHz are recorded magnetically or optically, or are transmitted on a communications channel carrier with superior fidelity by using novel electronic circuit system including implementations of an FM modulator, writing amplifier, and wideband discriminator which enable coding and decoding with high accuracy, low noise, and low interference. The video signals are used to directly modulate a square wave carrier using an FM technique employing a very low center frequency-to-bandwidth ratio without need for subsequent frequency translations. A writing amplifier provides gain needed for saturated recording with unique provisions to balance transition amplitudes for minimum second harmonic distortion without affecting the primary phasing of transitions. A novel multiwinding inductor and pulse discriminator implementation is capable of demodulating the very wide deviation FM signal with good cancellation of the second harmonic and fundamental FM carrier spectrums. Novel electronic circuit techniques are disclosed to provide high levels of performance with simple implementations of the electronic hardware.

摘要翻译： 通过使用包括FM调制器，写入放大器和宽带鉴别器的实现的新颖的电子电路系统，以磁性或光学方式记录高达25mHz的带宽的高分辨率视频信号，或者通过使用新颖的电子电路系统在具有高保真度的通信信道载体上传输， 解码精度高，噪音低，干扰小。 视频信号用于使用采用非常低的中心频率与带宽比的FM技术直接调制方波载波，而不需要随后的频率转换。 写入放大器提供饱和记录所需的增益，具有独特的规定，以平衡过渡幅度以实现最小二次谐波失真，而不会影响转换的初级定相。 一种新颖的多绕组电感器和脉冲鉴频器实现能够解调非常宽的偏差FM信号，具有良好的二次谐波和基波调频载波频谱的抵消。 公开了新颖的电子电路技术以通过电子硬件的简单实现来提供高水平的性能。

公开(公告)号：US5902243A

公开(公告)日：1999-05-11

申请号：US61083

申请日：1998-04-15

申请人： Gregory L. Holley ,  David J. Hedberg ,  David J. Napolitano

发明人： Gregory L. Holley ,  David J. Hedberg ,  David J. Napolitano

IPC分类号： G01S7/52 ,  G01S15/89 ,  A61B8/00

CPC分类号： G01S15/8963 ,  G01S15/895 ,  G01S7/52038

摘要： An ultrasound imaging method includes the step of transmitting two ultrasonic transmit pulses into a region. First components of the transmit pulses are inverted with respect to each other while second components of the transmit pulses are not. Received ultrasound pulses associated with the transmit pulses are summed to selectively cancel the harmonic or fundamental components. By properly selecting the inverted and noninverted portions of the transmit pulses, the transmit pulses may be made unipolar, or they may be pre-distorted to further reduce second harmonic energy associated with system or tissue non-linearities.

摘要翻译： 超声波成像方法包括将两个超声波发射脉冲发射到区域中的步骤。 发送脉冲的第一分量相对于彼此反转，而发送脉冲的第二分量不是。 与发射脉冲相关联的接收超声脉冲被相加以选择性地消除谐波或基波分量。 通过适当地选择发射脉冲的反相和非反相部分，发射脉冲可以是单极的，或者它们可以被预失真以进一步减少与系统或组织非线性相关联的二次谐波能量。

公开(公告)号：US4471317A

公开(公告)日：1984-09-11

申请号：US444084

申请日：1982-11-12

申请人： C. Gary Nilsson ,  David J. Hedberg

发明人： C. Gary Nilsson ,  David J. Hedberg

IPC分类号： G11B20/10 ,  H03G3/20 ,  H03G3/30

CPC分类号： H03G3/3036 ,  G11B20/10

摘要： An AGC amplifier having a fast response for recovery and reacquisition of gain control in microseconds after a signal break including a first and second amplifiers interconnected by a delay line equalizer. An integrator control loop is responsive to the output of the second amplifier and is connected to the control means provided on the first amplifier and includes a feedback loop having a peak detector, an ideal integrator connected to the output of the peak detector and directly controlling the first amplifier using an ideal integrator capacitor loop during control operation and having a switch removable reset loop for operating as a fixed high gain amplifier in the absence of signal. The latter is determined by a comparator operating to receive a second peak detector signal not in the control loop.

摘要翻译： 一种具有快速响应的AGC放大器，用于在包括通过延迟线均衡器互连的第一和第二放大器的信号断开之后的微秒内恢复和重新获取增益控制。 积分器控制回路响应于第二放大器的输出，并且连接到设置在第一放大器上的控制装置，并且包括具有峰值检测器的反馈回路，连接到峰值检测器的输出的理想积分器，并直接控制 第一放大器在控制操作期间使用理想的积分器电容器回路，并且具有用于在没有信号的情况下作为固定高增益放大器工作的开关可移除复位环路。 后者由操作以接收不在控制回路中的第二峰值检测器信号的比较器确定。

公开(公告)号：US06905467B2

公开(公告)日：2005-06-14

申请号：US09884407

申请日：2001-06-18

申请人： Charles E. Bradley ,  Gregory L. Holley ,  Lawrence J. Newell ,  David J. Hedberg ,  Dave Napolitano

发明人： Charles E. Bradley ,  Gregory L. Holley ,  Lawrence J. Newell ,  David J. Hedberg ,  Dave Napolitano

IPC分类号： G01S7/52 ,  G01S15/89 ,  A61B8/00

CPC分类号： G01S7/52039 ,  G01S7/52038 ,  G01S7/52046 ,  G01S15/895

摘要： Improvements to a method for imaging a target, which method including the steps of (a) transmitting ultrasonic energy at a fundamental frequency, (b) receiving reflected ultrasonic energy at a harmonic of the fundamental frequency and (c) generating an image responsive to reflected energy at the harmonic, are provided. The transmitting step includes transmitting a waveform with a positive pulse spatially defined by first and second zero values. A positive peak amplitude of the positive pulse is a first distance from the first zero value that is less than half a second distance between said first and second zero values. Thus, the waveform includes a fundamental spectral component and a harmonic spectral component at the transducer. An attenuation normalized peak of the harmonic spectral component is reduced at a region spaced from the transducer as compared to the peak at a region adjacent to the transducer. A negative peak is also shifted or pre-distorted. Various pre-distortions of the waveform may compensate for propagation, scattering, or system non-linearities.

摘要翻译： 用于对目标成像的方法的改进，该方法包括以下步骤：（a）以基本频率发送超声能量，（b）在基频谐波处接收反射的超声波能量，以及（c）响应于反射的 提供谐波的能量。 发送步骤包括以由第一和第二零值空间定义的正脉冲发送波形。 正脉冲的正峰值振幅是与第一零值之间的第一距离，该第一零值小于所述第一和第二零值之间的第二距离的一半。 因此，波形包括传感器处的基本频谱分量和谐波频谱分量。 与与换能器相邻的区域的峰值相比，谐振频谱分量的衰减归一化峰值在与换能器间隔的区域减小。 负峰也被转移或预失真。 波形的各种预失真可以补偿传播，散射或系统非线性。

公开(公告)号：US06731168B2

公开(公告)日：2004-05-04

申请号：US10071736

申请日：2002-02-06

申请人： David J. Hedberg ,  James A. Sills ,  Eric M. Brombaugh

发明人： David J. Hedberg ,  James A. Sills ,  Eric M. Brombaugh

IPC分类号： H03F130

CPC分类号： H03F1/3294 ,  H03F1/3247

摘要： A power amplifier linearizer (12) includes an on-chip portion (60) and an external controller (22). The on-chip portion (60) implements two predistortion circuits (86, 88) desirably configured as look-up tables. One predistortion circuit (88) is programmed by the external controller (22) to apply a hotter linearizing translation function (54) and the other predistortion circuit (86) is programmed by the external controller (22) to apply a colder linearizing translation function (56). One or more temperature signals (24, 38) are correlated with the temperatures experienced by a power amplifier (34) and drive a power amplifier thermal modeler (50) implemented in the controller (22). As a result of running the thermal modeler (50), the controller (22) generates an interpolation signal (26) that indicates how far to interpolate between the hotter and colder translation functions (54, 56).

摘要翻译： 功率放大器线性化器（12）包括片上部分（60）和外部控制器（22）。 片上部分（60）实现期望配置为查找表的两个预失真电路（86,88）。 一个预失真电路（88）由外部控制器（22）编程以应用更热的线性化转换功能（54），另一个预失真电路（86）由外部控制器（22）编程，以应用较冷的线性化转换功能 56）。 一个或多个温度信号（24,38）与功率放大器（34）经历的温度相关并且驱动在控制器（22）中实现的功率放大器热建模器（50）。 作为运行热建模器（50）的结果，控制器（22）产生指示在较热和较冷的翻译功能（54,56）之间多长时间内插的内插信号（26）。

公开(公告)号：US4724495A

公开(公告)日：1988-02-09

申请号：US784674

申请日：1985-10-04

申请人： David J. Hedberg ,  Edward P. Denta, Jr. ,  Victor E. Jo Chiong

发明人： David J. Hedberg ,  Edward P. Denta, Jr. ,  Victor E. Jo Chiong

IPC分类号： G11B5/55 ,  G11B19/28 ,  G11B27/10 ,  H04N5/781 ,  H04N9/808 ,  G11B5/02 ,  G11B5/09

CPC分类号： H04N9/808 ,  G11B19/28 ,  G11B27/105 ,  G11B5/5521 ,  H04N5/781 ,  G11B2220/20

摘要： A real-time magnetic digital video disk recording system has been developed for applications in on-line digital imaging systems and off-line fast access image storage and retrieval buffers. The disk recorder uses new high density recording technology and Winchester computer drive technology in a unique peripheral configuration which is fully synchronized to video system timing, provides for flexible formatting, achieves fast random access to a large video image file, and eliminates the need for complex data controllers. The recorder includes two independent actuator and head assemblies for alternately recording successive video fields on separate tracks on separate zones A and B of a disk stack. Movement of one of the actuators and head assemblies is controlled and occurs within a field time to skip tracks containing media flaws to achieve real time digital video recording. The invention bidirectionally receives and transmits data from buses of one size into buses of another size and formats the data into a recordable, compatible format, all under program control. The invention provides unique spindle speed timing acquisition. The invention provides a new circuit for the magnetic read/write head.

摘要翻译： 已经开发了用于在线数字成像系统和离线快速访问图像存储和检索缓冲器中的应用的实时磁数字视频盘记录系统。 磁盘记录仪采用新的高密度记录技术和温彻斯特计算机驱动技术，其独特的外设配置与视频系统时序完全同步，提供灵活的格式化，实现对大型视频图像文件的快速随机访问，无需复杂 数据控制器。 记录器包括两个独立的致动器和头部组件，用于在磁盘堆叠的不同区域A和B上的不同磁道上交替记录连续的视频场。 执行器和头部组件中的一个的移动被控制并且在场内时间内发生，以跳过包含媒体缺陷的轨道以实现实时数字视频记录。 本发明从一个大小的总线双向地接收和发送数据到另一个大小的总线，并将数据格式化为可记录的兼容格式，全部都在程序控制之下。 本发明提供独特的主轴速度定时采集。 本发明提供了一种用于磁读/写头的新电路。

公开(公告)号：US06831517B1

公开(公告)日：2004-12-14

申请号：US10650337

申请日：2003-08-27

申请人： David J. Hedberg ,  James B. Turner

发明人： David J. Hedberg ,  James B. Turner

IPC分类号： H03G310

CPC分类号： H03F1/0261 ,  H03F1/0211 ,  H03F1/30 ,  H03F1/32 ,  H03F2200/102 ,  H03F2200/108 ,  H03F2200/181 ,  H03F2200/318 ,  H03F2200/411

摘要： A system (100) and method (200) for adaptively managing bias of an RF power amplifier (102) is provided. The system (100) incorporates a controller (116) configured to select a radio operating mode. A current-mirror circuit (114) is coupled to the controller (116) and configured to produce a reference current (IRef) as a function of the radio operating mode. A bias regulator (104) is coupled to the controller (116) and the current-mirror circuit (114) and configured to produce a driver-stage bias current (Ib1) and an output-stage bias current (Ib2) for the power amplifier (102) in response to the reference current (IRef). The system (100) also incorporates a DC-to-DC converter (118) coupled to the controller (116) and configured to provide a supply voltage (Vcc) for the power amplifier (102) in response to the radio operating mode. The system (100) also incorporates an envelope detector (120) configured to produce an envelope current (IEnv) in response to an RF input signal (126). The system (100) causes the reference current (IRef) to vary as a function of the envelope current (IEnv).

摘要翻译： 提供了一种用于自适应地管理RF功率放大器（102）的偏置的系统（100）和方法（200）。 系统（100）包括被配置为选择无线电操作模式的控制器（116）。 电流镜电路（114）耦合到控制器（116）并被配置为产生作为无线电操作模式的函数的参考电流（IRef）。 偏置调节器（104）耦合到控制器（116）和电流镜电路（114），并被配置为产生用于功率放大器的驱动级偏置电流（Ib1）和输出级偏置电流（Ib2） （102）响应于参考电流（IRef）。 系统（100）还包括耦合到控制器（116）并被配置为响应于无线电操作模式而为功率放大器（102）提供电源电压（Vcc）的DC-DC转换器（118）。 系统（100）还包括被配置为响应于RF输入信号（126）产生包络电流（IEnv）的包络检测器（120）。 系统（100）使得参考电流（IRef）作为包络电流（IEnv）的函数而变化。