公开(公告)号：US20120184855A1

公开(公告)日：2012-07-19

申请号：US13432818

申请日：2012-03-28

Applicant: Udayan DASGUPTA ,  David P. MAGEE ,  Murtaza ALI

Inventor： Udayan DASGUPTA ,  David P. MAGEE ,  Murtaza ALI

IPC: A61B8/06

CPC classification number: G01S15/8981 ,  A61B8/06 ,  A61B8/13 ,  A61B8/461 ,  A61B8/488 ,  A61B8/5207 ,  G01S7/52095 ,  G01S15/8979

Abstract: Methods for color Doppler imaging in an ultrasound imaging system are disclosed herein. Ultrasound radio frequency RF data is demodulated using a nested processing loop including an inner loop and an outer loop. A plurality of Wall filter coefficients are fetched from ultrasound imaging system memory in a single memory access cycle. The plurality Wall filter coefficients are applied to a plurality of complex ultrasound data values in a single execution cycle. The Wall filtered ultrasound data are provided to a flow estimator.

Abstract translation: 本文公开了超声成像系统中彩色多普勒成像的方法。 使用包括内环和外环的嵌套处理环来解调超声射频RF数据。 在单个存储器访问周期中，从超声成像系统存储器中获取多个壁滤波器系数。 多个Wall滤波器系数在单个执行周期中被应用于多个复数超声数据值。 将经过滤波的超声波数据提供给流量估计器。

公开(公告)号：US20100004542A1

公开(公告)日：2010-01-07

申请号：US12490709

申请日：2009-06-24

Applicant: Udayan DASGUPTA ,  David P. MAGEE ,  Murtaza ALI

Inventor： Udayan DASGUPTA ,  David P. MAGEE ,  Murtaza ALI

IPC: A61B8/00

CPC classification number: G01S15/8981 ,  A61B8/06 ,  A61B8/13 ,  A61B8/461 ,  A61B8/488 ,  A61B8/5207 ,  G01S7/52095 ,  G01S15/8979

Abstract: Systems and methods for color Doppler imaging in an ultrasound imaging system are disclosed herein. An ultrasound imaging system includes color Doppler imaging circuitry. The color Doppler imaging circuitry is configured to estimate flow parameters. The imaging circuitry includes a radio frequency (“RF”) demodulator configured to produce in-phase and quadrature components of an ultra-sound data vector. The RF demodulator includes a table in memory that stores interleaved sine and cosine values. The RF demodulator maintains an index value for the table having higher precision than is used to index the table. The RF demodulator rounds the index value for each access of the table. Each table access retrieves a sine value and a cosine value.

Abstract translation: 本文公开了超声成像系统中彩色多普勒成像的系统和方法。 超声成像系统包括彩色多普勒成像电路。 彩色多普勒成像电路被配置为估计流量参数。 成像电路包括被配置为产生超声数据向量的同相和正交分量的射频（“RF”）解调器。 RF解调器包括存储交错的正弦和余弦值的存储器中的表。 RF解调器为表具有比用于索引表的精度更高的索引值。 RF解调器舍入表的每个访问的索引值。 每个表访问检索正弦值和余弦值。

公开(公告)号：US07555049B2

公开(公告)日：2009-06-30

申请号：US11220089

申请日：2005-09-06

Applicant: Murtaza Ali ,  Shahedolla Molla ,  Narasimhan Venkatraman ,  Channamallesh Hiremath ,  Umashankar S. Iyer ,  Udayan Dasgupta ,  Austin Paul Hunt ,  Dennis G. Mannering

Inventor： Murtaza Ali ,  Shahedolla Molla ,  Narasimhan Venkatraman ,  Channamallesh Hiremath ,  Umashankar S. Iyer ,  Udayan Dasgupta ,  Austin Paul Hunt ,  Dennis G. Mannering

IPC: H04K1/10 ,  H04L27/28 ,  G06F15/16

CPC classification number: H04M11/062

Abstract: A client premises digital subscriber line (DSL) modem having multi-mode capability is disclosed. In initialization, the modem estimates whether channel conditions are such that digital processing of the received data according to a lower data rate DSL standard, such as ADSL2, may result in a higher effective data rate than receipt and processing according to a higher data rate DSL standard, such as ADSL2+. If so, the DSL modem configures itself, such as by configuring its filter characteristics and sampling frequency, to receive and process data according to the lower data rate DSL standard; the transmitting modem, for example at a central office or service area interface, may continue to operate according to the higher data rate standard (with its bit loading corresponding to a subset of subchannels). The receiving DSL modem processes the payload data according to the lower standard, while processing control messages according to the higher standard.

Abstract translation: 公开了具有多模式能力的客户端数字用户线（DSL）调制解调器。 在初始化中，调制解调器估计信道条件是否使得根据诸如ADSL2的较低数据速率DSL标准的接收数据的数字处理可以导致比根据较高数据速率DSL的接收和处理更高的有效数据速率 标准，如ADSL2 +。 如果是这样，则DSL调制解调器通过配置其滤波器特性和采样频率来配置自身，以根据较低数据速率DSL标准接收和处理数据; 发射调制解调器例如在中心局或服务区接口处可以根据较高的数据速率标准（其位加载对应于子信道子集）继续运行。 接收DSL调制解调器根据较低的标准处理有效载荷数据，同时根据较高的标准处理控制消息。

公开(公告)号：US07190717B2

公开(公告)日：2007-03-13

申请号：US11233452

申请日：2005-09-22

Applicant: Channamallesh G. Hiremath ,  Udayan Dasgupta ,  Zigang Yang ,  Umashanker S. Iyer ,  Michael E. Locke

Inventor： Channamallesh G. Hiremath ,  Udayan Dasgupta ,  Zigang Yang ,  Umashanker S. Iyer ,  Michael E. Locke

IPC: H04L5/16

CPC classification number: H04L5/006 ,  H04L1/0071 ,  H04L1/04 ,  H04L5/0007 ,  H04L5/0044 ,  H04L27/2647

Abstract: A system and method for reordering tones of a DMT signal within a communication system is described. Cross tone correlated noise in a received signal is identified and rearranged such that tones with correlated noise are spread out throughout the received signal before being processed by a decoder such as, Viterbi decoder. In an embodiment, two tones with the most correlated noise are placed at each end of the sequence of tones presented to the Viterbi decoder. In some embodiment, the tones with correlated noise can be spread such that two adjacent tones with correlated noise have a minimum distance of at least three tones between them at the input to the Viterbi decoder. In other embodiment, tones in the received signal can be processed in various kinds of interleavers for reordering according to the interleaver scheme.

Abstract translation: 描述了用于在通信系统内重新排序DMT信号的音调的系统和方法。 识别和重新排列接收信号中的交叉音相关噪声，使得具有相关噪声的音调在由诸如维特比解码器之类的解码器处理之前，在整个接收信号中被扩展。 在一个实施例中，具有最相关噪声的两个音调被放置在呈现给维特比解码器的音调序列的每一端。 在一些实施例中，可以扩展具有相关噪声的音调，使得具有相关噪声的两个相邻音调在维特比解码器的输入处具有至少三个音调的最小距离。 在其他实施例中，可以根据交织器方案在各种交织器中处理接收信号中的音调以进行重新排序。

公开(公告)号：US07023929B2

公开(公告)日：2006-04-04

申请号：US10191994

申请日：2002-07-10

Applicant: Fernando A. Mujica ,  Udayan Dasgupta ,  Mangesh Sadafale ,  Sandeep Oswal ,  Prakash Easwaran

Inventor： Fernando A. Mujica ,  Udayan Dasgupta ,  Mangesh Sadafale ,  Sandeep Oswal ,  Prakash Easwaran

IPC: H04K1/10

CPC classification number: H04L27/367 ,  H04L27/2626

Abstract: A method of providing an improved transfer function for a Discrete Multitone (DMT) type modulation transmitter with digital filtering after modulation followed by digital to analog converter and analog filtering is provided by sending a test signal to said transmitter and measuring the results of the test signal to determine the transfer function. The inverse of the transfer function that needs to be compensated is determined and the inverse of transfer function to be compensated is truncated to the region of interest (H2). The desired band split component of pre-compensation filter is designed (H3). The desired target frequency response of the pre-compensation filter is determined by H4=H2*H3 where H4 is the multiplication of H2 and H3 Given the target frequency response in H4 Hermetian symmetry is imposed on the frequency response. The inverse Fourier transform (IFFT) is taken to generate a time domain filter, h5. The characteristic of this filter is added at the digital filtering after modulation.

Abstract translation: 通过向所述发射机发送测试信号并测量测试信号的结果，提供一种为调制后的数字滤波后的数模转换器和模拟滤波器为离散多音（DMT）型调制发射机提供改进的传递函数的方法 确定传递函数。 确定需要补偿的传递函数的逆，并且要补偿的传递函数的逆被截断到感兴趣的区域（H 2> 2）。 设计了预补偿滤波器的期望频带分离分量（H 3 3 3）。 预补偿滤波器的期望目标频率响应由H 4 = H 2 / H 3 3 H 3确定，其中H 4 < 假定在H 4中的目标频率响应，Hermetian对称性被施加在频率响应上，则/ SUB>是H 2 2和H 3 3的乘法。 采用逆傅里叶变换（IFFT）来产生时域滤波器h 5。 该滤波器的特性在调制后的数字滤波中相加。

公开(公告)号：US20050169358A1

公开(公告)日：2005-08-04

申请号：US11043218

申请日：2005-01-26

Applicant: Arthur Redfern ,  Udayan Dasgupta

Inventor： Arthur Redfern ,  Udayan Dasgupta

IPC: H04B1/38 ,  H04L27/26

CPC classification number: H04L27/2608 ,  H04B1/38

Abstract: An integrated circuit 18 is provided that includes a memory 32 and a memory modification component 33. The memory 32 maintains a bits count, a gain, and a tone order for each of a plurality of discrete multi-tone sub-channels. The memory modification component 33 operable to control an in-service modification of at least some of the bits count, the gain, and the tone order using a single bits, gains and tone order table.

Abstract translation: 提供了包括存储器32和存储器修改组件33的集成电路18.存储器32维持多个离散多音调子频道中的每一个的比特计数，增益和音调顺序。 存储器修改组件33可用于使用单个比特，增益和音调顺序表来控制比特计数，增益和音调顺序中的至少一些的在职修改。