-
公开(公告)号：US5905692A
公开(公告)日：1999-05-18
申请号：US1452
申请日：1997-12-31
申请人： Enrico Dolazza , Michael Lachmayr , Louis R. Poulo
发明人： Enrico Dolazza , Michael Lachmayr , Louis R. Poulo
CPC分类号： G01S7/52095 , G01S7/52023 , G01S7/52046 , G10K11/345
摘要： An array transducer ultrasound beamformer includes a plurality of processing channels, one for each active element of the transducer array. Each channel includes a digitizing unit for converting the received signal to digital samples and a time multiplexed delay unit for producing a primary stream of delayed TDM samples corresponding to one or more beams. Within each channel, the primary stream of delayed TDM samples is demultiplexed in order to separate the stream in a plurality of secondary streams of delayed TDM samples, wherein each of the secondary streams corresponds to a portion of a beam or a single beam.
摘要翻译： 阵列换能器超声波束形成器包括多个处理通道，一个用于换能器阵列的每个有源元件。 每个通道包括用于将接收的信号转换为数字样本的数字化单元和用于产生对应于一个或多个波束的延迟TDM样本的主流的时间复用延迟单元。 在每个信道内，延迟的TDM样本的主流被多路分解，以便在延迟的TDM样本的多个次流中分离流，其中每个次流对应于波束或单个波束的一部分。
-
公开(公告)号：US5935070A
公开(公告)日：1999-08-10
申请号：US1861
申请日：1997-12-31
申请人： Enrico Dolazza , Louis R. Poulo
发明人： Enrico Dolazza , Louis R. Poulo
CPC分类号： G01S7/52025 , G10K11/346 , G01S7/52046
摘要： An ultrasound beamformer that processes the signals of an array transducer includes a plurality of processing channels, one for each element of the active transducer array. Each channel includes a digitizing element for converting the received signal into digital samples and a delay element for delaying the digitized signal. The delays are chosen so that when the signals from the individual channels are combined, a beam forms in a particular direction. The invention implements sub-sampling period delays in the individual channels with low-complexity digital filters having superior delay characteristics with respect to frequency, but having undesirable attenuation characteristics with respect to frequency. The invention corrects for the undesirable attenuation characteristics via a single digital filter after the signals from the individual channels have been combined.
摘要翻译： 处理阵列换能器的信号的超声波束形成器包括多个处理通道，一个用于有源换能器阵列的每个元件。 每个通道包括用于将接收的信号转换成数字样本的数字化元件和用于延迟数字化信号的延迟元件。 选择延迟使得当来自各个通道的信号被组合时，波束在特定方向上形成。 本发明实现具有低复杂度数字滤波器的各个信道中的子采样周期延迟，其相对于频率具有优异的延迟特性，但是相对于频率具有不期望的衰减特性。 本发明通过单个数字滤波器在来自各个信道的信号已被组合之后校正不期望的衰减特性。
-
公开(公告)号：US20140003582A1
公开(公告)日：2014-01-02
申请号：US13538141
申请日：2012-06-29
申请人： Louis R. Poulo
发明人： Louis R. Poulo
IPC分类号： H05G1/64
摘要： Among other things, a communication system and technique for transferring information between a stationary unit and a rotating unit of a computed tomography (CT) system is provided. A transmitter is configured to map digital data to an analog signal by selecting, from at least three signal configurations, a signal configuration associated with the digital data, and to generate an analog signal according to the selected signal configuration. A receiver of the communication system is configured to decode an analog signal by comparing characteristics of a signal sample to at least three possible signal configurations, and to identify a digital code word that corresponds to a signal configuration (of the at least three possible signal configurations) that matches characteristics of the signal sample. In this way, in a CT application, more than 1-bit of data may be communicated per analog signal, allowing more data to be communicated faster.
摘要翻译： 其中，提供了用于在计算机断层摄影（CT）系统的固定单元和旋转单元之间传送信息的通信系统和技术。 发射器被配置为通过从至少三个信号配置中选择与数字数据相关联的信号配置并将数字数据映射到模拟信号，并根据所选择的信号配置产生模拟信号。 通信系统的接收机被配置为通过将信号样本的特性与至少三种可能的信号配置进行比较来解码模拟信号，并且识别对应于信号配置的数字码字（至少三种可能的信号配置 ）匹配信号样本的特征。 以这种方式，在CT应用中，可以每模拟信号传送超过1位的数据，从而允许更快地传送更多的数据。
-
公开(公告)号：US09144412B2
公开(公告)日：2015-09-29
申请号：US13538141
申请日：2012-06-29
申请人： Louis R. Poulo
发明人： Louis R. Poulo
摘要： Among other things, a communication system and technique for transferring information between a stationary unit and a rotating unit of a computed tomography (CT) system is provided. A transmitter is configured to map digital data to an analog signal by selecting, from at least three signal configurations, a signal configuration associated with the digital data, and to generate an analog signal according to the selected signal configuration. A receiver of the communication system is configured to decode an analog signal by comparing characteristics of a signal sample to at least three possible signal configurations, and to identify a digital code word that corresponds to a signal configuration (of the at least three possible signal configurations) that matches characteristics of the signal sample. In this way, in a CT application, more than 1-bit of data may be communicated per analog signal, allowing more data to be communicated faster.
摘要翻译： 其中，提供了用于在计算机断层摄影（CT）系统的固定单元和旋转单元之间传送信息的通信系统和技术。 发射器被配置为通过从至少三个信号配置中选择与数字数据相关联的信号配置并将数字数据映射到模拟信号，并根据所选择的信号配置产生模拟信号。 通信系统的接收机被配置为通过将信号样本的特性与至少三种可能的信号配置进行比较来解码模拟信号，并且识别对应于信号配置的数字码字（至少三种可能的信号配置 ）匹配信号样本的特征。 以这种方式，在CT应用中，可以每模拟信号传送超过1位的数据，从而允许更快地传送更多的数据。
-
公开(公告)号：US5111133A
公开(公告)日：1992-05-05
申请号：US589068
申请日：1990-09-27
申请人： Louis R. Poulo , James G. Staley
发明人： Louis R. Poulo , James G. Staley
CPC分类号： H02M3/1588 , Y02B70/1466
摘要： A converter circuit operable in a current control mode is disclosed. The circuit is of the type including an (1) inductor, (2) a clock for providing a clocking signal so that the circuit operates as a synchronous converter and (3) switching means, responsive to the clocking signal and a threshold current, for controlling the load voltage across the inductor between at least two different levels of voltage as a function of one or more supply voltages so that the inductor conducts (a) increasing inductor current for one level of load voltage from the beginning of each cycle of the clocking signal until the inductor current equals the threshold current during each cycle, and (b) decreasing inductor current for the other level of voltage from the time in each cycle the current equals the threshold current until the end of each said cycle. The threshold current is generated as a function of the load and supply voltages so that the slope and level of the threshold current is the desired steady state solution of the decreasing inductor current so that any perturbations of the inductor current immediately converges to the steady state solution at the time in each cycle the current equals the threshold current, and compensation is provided so that the average current passing through the inductor is substantially independent of the supply and load voltages.
摘要翻译： 公开了可在电流控制模式下工作的A转换器电路。 电路类型包括（1）电感器，（2）用于提供时钟信号的时钟，使得电路作为同步转换器工作，以及（3）响应于时钟信号和阈值电流的开关装置，用于 控制电感器之间的负载电压在至少两个不同电平之间的电压作为一个或多个电源电压的函数，使得电感器传导（a）从每个时钟的每个周期开始的一个级别的负载电压增加电感器电流 信号，直到电感器电流等于每个周期内的阈值电流，并且（b）从每个周期的时间起降低其他电平电平的电感电流，电流等于阈值电流直至每个所述周期结束。 产生阈值电流作为负载和电源电压的函数，使得阈值电流的斜率和电平是减小的电感电流的期望的稳态解，使得电感器电流的任何扰动立即收敛到稳态解 在每个周期的时间，电流等于阈值电流，并且提供补偿，使得通过电感器的平均电流基本上与供给和负载电压无关。
-
公开(公告)号：US4595958A
公开(公告)日：1986-06-17
申请号：US644491
申请日：1984-08-24
CPC分类号： H04N1/3935 , G06T3/40
摘要： A process is described for converting an image in one digital format to a second digital format by considering both horizontal and vertical values of pixels to generate output pixels of intermediate value.
摘要翻译： 描述了通过考虑像素的水平和垂直值将一个数字格式的图像转换为第二数字格式以生成中间值的输出像素的过程。
-
公开(公告)号：US4218583A
公开(公告)日：1980-08-19
申请号：US929179
申请日：1978-07-28
申请人： Louis R. Poulo
发明人： Louis R. Poulo
CPC分类号： H04S3/002 , H04R2205/022
摘要： A loudspeaker system having two angled rear panels with four drivers on each rear panel and a single driver on the front panel has the drivers connected in series between first and second terminals and a third terminal connected to the junction of the front driver and one of the banks of series-connected rear drivers. First and second power amplifiers are connected between the third terminal and the first and second terminals, respectively. A potentiometer is connected between the inputs of the first and second power amplifiers with the potentiometer arm coupled to the third terminal through a capacitor.
摘要翻译： 一种扬声器系统，具有两个后置面板，每个后面板具有四个驱动器，前面板上的单个驱动器具有串联连接在第一和第二端子之间的驱动器，以及连接到前驱动器和 串联后置驱动器。 第一和第二功率放大器分别连接在第三端子和第一和第二端子之间。 电位器连接在第一和第二功率放大器的输入端之间，电位器臂通过一个电容耦合到第三个端子。
-
8.发明授权Data acquisition system using delta-sigma analog-to-digital signal converters 失效采用delta-sigma模数转换器的数据采集系统公开(公告)号：US06657571B2
公开(公告)日：2003-12-02
申请号：US09874769
申请日：2001-06-05
申请人： Bernard M. Gordon , Hans Weedon , Louis R. Poulo , Mark H. Miller
发明人： Bernard M. Gordon , Hans Weedon , Louis R. Poulo , Mark H. Miller
IPC分类号： H03M300
摘要： A delta-sigma A/D converter includes a delta-sigma modulator having an integrating amplifier dispose within the loop of the modulator so that the input of the modulator can be connected to receive relatively low level input currents, and so as to improve DC stability. The modulator is specifically adapted for IC implementation for use in a DAS of a CT scanner so that the current output of a detector of the scanner can be connected directly to the input of the modulator of the converter. The noise shaping characteristics are shaped so as to provide an improved frequency response with minimal spillover. Noise shaping of the converter is provided throughout the dynamic range of the current outputs of CT scanner detectors so as to compensate for the poorer S/N for low input currents. The preferred converter also includes a unique digital filter transfer function, with finite impulse response (FIR) filter characteristics, optimized for CT-DAS applications and having excellent characteristics in the frequency domain and the time domain.
摘要翻译： Δ-ΣA / D转换器包括具有集成放大器的Δ-Σ调制器，其布置在调制器的环路内，使得调制器的输入可以被连接以接收相对低电平的输入电流，并且从而提高DC稳定性 。 该调制器特别适用于CT实施用于CT扫描器的DAS，使得扫描仪的检测器的电流输出可以直接连接到转换器的调制器的输入端。 噪声整形特性的形状使得以最小的溢出提供改进的频率响应。 在CT扫描仪检测器的电流输出的动态范围内提供转换器的噪声整形，以补偿低输入电流的较差的S / N。 优化的转换器还包括独特的数字滤波器传递功能，具有有限脉冲响应（FIR）滤波器特性，针对CT-DAS应用优化，并且在频域和时域中具有优异的特性。
-
9.发明授权Data acquisition system using delta-sigma analog-to-digital signal converters 有权采用delta-sigma模数转换器的数据采集系统公开(公告)号：US06252531B1
公开(公告)日：2001-06-26
申请号：US09243708
申请日：1999-02-03
申请人： Bernard M. Gordon , Hans Weedon , Louis R. Poulo , Mark H. Miller
发明人： Bernard M. Gordon , Hans Weedon , Louis R. Poulo , Mark H. Miller
IPC分类号： H03M300
摘要： A delta-sigma A/D converter includes a delta-sigma modulator having an integrating amplifier dispose within the loop of the modulator so that the input of the modulator can be connected to receive relatively low level input currents, and so as to improve DC stability. The modulator is specifically adapted for IC implementation for use in a DAS of a CT scanner so that the current output of a detector of the scanner can be connected directly to the input of the modulator of the converter. The noise shaping characteristics are shaped so as to provide an improved frequency response with minimal spillover. Noise shaping of the converter is provided throughout the dynamic range of the current outputs of CT scanner detectors so as to compensate for the poorer S/N for low input currents. The preferred converter also includes a unique digital filter transfer function, with finite impulse response (FIR) filter characteristics, optimized for CT-DAS applications and having excellent characteristics in the frequency domain and the time domain.
摘要翻译： Δ-ΣA / D转换器包括具有集成放大器的Δ-Σ调制器，其布置在调制器的环路内，使得调制器的输入可以被连接以接收相对低电平的输入电流，并且从而提高DC稳定性 。 该调制器特别适用于CT实施用于CT扫描器的DAS，使得扫描仪的检测器的电流输出可以直接连接到转换器的调制器的输入端。 噪声整形特性的形状使得以最小的溢出提供改进的频率响应。 在CT扫描仪检测器的电流输出的动态范围内提供转换器的噪声整形，以补偿低输入电流的较差的S / N。 优化的转换器还包括独特的数字滤波器传递功能，具有有限脉冲响应（FIR）滤波器特性，针对CT-DAS应用优化，并且在频域和时域中具有优异的特性。
-
10.发明授权Digital autozero circuit operable in a plurality of modes with separate storage for offset corrections for each mode 失效数字自动调零电路可以以多种模式工作，具有用于每种模式的偏移校正的单独存储器
公开(公告)号：US5053770A
公开(公告)日：1991-10-01
申请号：US526067
申请日：1990-05-18
申请人： Eliot Mayer , Louis R. Poulo , Jeffrey L. Sauer , Hans J. Weedon
发明人： Eliot Mayer , Louis R. Poulo , Jeffrey L. Sauer , Hans J. Weedon
CPC分类号： H03F1/304 , H03M1/1019 , H03M1/1225 , H03M1/183
摘要： An autozero compensation system for autozeroing the output of a data conversion circuit comprising a floating point amplifier and an analog-to-digital converter. The autozero compensation system comprises a source for generating a desired offset voltage, a plurality of digital counters, one for each gain setting of the amplifier, for storing values which are functions of the offset voltages for the gain settings, and a comparator for comparing the output of the A/D converter with the desired offset. Periodically, each of the counters in the autozero circuit is updated for each gain setting by setting the analog input of the amplifier to system ground and the gain of the amplifier set to each of the gain settings, so that the output of the comparator is used to update each of the counters. The outputs of the counters are each converted to analog form by a D/A converter and used to provide the offset correction voltage to the floating point amplifier.
摘要翻译： 一种用于对包括浮点放大器和模数转换器的数据转换电路的输出进行自动调零的自动调零补偿系统。 自动归零补偿系统包括用于产生期望的偏移电压的源，多个数字计数器，一个用于放大器的每个增益设置，用于存储作为增益设置的偏移电压的函数的值，以及比较器 输出具有所需偏移的A / D转换器。 周期性地，通过将放大器的模拟输入设置为系统地，并且将放大器的增益设置为每个增益设置，对于每个增益设置来更新每个增益设置中的每个计数器，使得使用比较器的输出 更新每个计数器。 计数器的输出各自由D / A转换器转换为模拟形式，用于向浮点放大器提供偏移校正电压。
-
-
-
-
-
-
-
-
-
搜索结果
11 条记录 (耗时 0.019 秒)
