公开(公告)号：US11632167B2

公开(公告)日：2023-04-18

申请号：US17691280

申请日：2022-03-10

申请人： Stanley Kay ,  Udaya Bhaskar ,  Neal David Becker

发明人： Stanley Kay ,  Udaya Bhaskar ,  Neal David Becker

IPC分类号： H04B7/06 ,  H04B7/204 ,  H04B7/185

摘要： A system and method for scheduling a variable stayout distance when beam hopping, the method including providing an illumination area of a satellite and candidate beam centers disposed in the illumination area; measuring a respective scan angle from an antenna boresight to a respective beam center of the candidate beam centers; and determining a reuse factor k for each of the candidate beam centers, based on a proportion of the respective scan angle to a maximum scan angle. Each candidate beam center may be processed sequentially. Prior to adding each candidate beam center to a current beam center set, checking whether a candidate beam center meets the stayout distance criteria from all beam centers already in the beam center set.

公开(公告)号：US11309958B2

公开(公告)日：2022-04-19

申请号：US16729870

申请日：2019-12-30

申请人： Stanley Kay ,  Udaya Bhaskar ,  Neal David Becker

发明人： Stanley Kay ,  Udaya Bhaskar ,  Neal David Becker

IPC分类号： H04B7/06 ,  H04B7/204 ,  H04B7/185

摘要： A system and method for scheduling a variable stayout distance when beam hopping, the method including providing an illumination area of a satellite and candidate beam centers disposed in the illumination area; measuring a respective scan angle from an antenna boresight to a respective beam center of the candidate beam centers; and determining a reuse factor k for each of the candidate beam centers, based on a proportion of the respective scan angle to a maximum scan angle. Each candidate beam center may be processed sequentially. Prior to adding each candidate beam center to a current beam center set, checking whether a candidate beam center meets the stayout distance criteria from all beam centers already in the beam center set.

公开(公告)号：US11206570B2

公开(公告)日：2021-12-21

申请号：US16880762

申请日：2020-05-21

申请人： Udaya Bhaskar ,  Stanley Kay ,  Neal David Becker

发明人： Udaya Bhaskar ,  Stanley Kay ,  Neal David Becker

IPC分类号： H04W28/02 ,  H04W24/08 ,  H04W16/22 ,  H04W16/28

摘要： A system and method for beamforming beams including: matching weights T to a distribution of resources for each of the beams based on a traffic variation for each of the beams; calculating, with a signal processor for each of the beams based on the weights T, a power scalar β and a weighted minimum mean squared error (WMMSE) matrix WWMSE; and transmitting/receiving the beams based on the power scalar β and the WMMSE matrix WWMSE, where the power scalar β satisfies a total power constraint of an antenna subsystem.

公开(公告)号：US20130018932A1

公开(公告)日：2013-01-17

申请号：US13180969

申请日：2011-07-12

申请人： Udaya Bhaskar ,  Chi-Jiun Su

发明人： Udaya Bhaskar ,  Chi-Jiun Su

IPC分类号： G06F17/10

CPC分类号： H04L65/60 ,  H03M7/3088 ,  H03M7/4006 ,  H04L69/04

摘要： A system and method are provided for use with streaming blocks of data, each of the streaming blocks of data including a number bits of data. The system includes a first compressor and a second compressor. The first compressor can receive and store a number n blocks of the streaming blocks of data, can receive and store a block of data to be compressed of the streaming blocks of data, can compress consecutive bits within the block of data to be compressed based on the n blocks of the streaming blocks of data, can output a match descriptor and a literal segment. The match descriptor is based on the compressed consecutive bits. The literal segment is based on a remainder of the number of bits of the data to be compressed not including the consecutive bits. The second compressor can compress the literal segment and can output a compressed data block including the match descriptor and a compressed string of data based on the compressed literal segment.

摘要翻译： 提供了一种用于流数据块的系统和方法，每个流数据块包括数位数据。 该系统包括第一压缩机和第二压缩机。 第一压缩器可以接收和存储流数据块的数个n个块，可以接收和存储要压缩数据流数据块的数据块，可以基于压缩的数据块中的连续位来压缩 数据流块的n个块可以输出匹配描述符和文本段。 匹配描述符基于压缩的连续位。 文字片段基于要压缩的数据的比特数的剩余部分不包括连续的比特。 第二压缩器可以压缩字面部分并且可以输出包括匹配描述符的压缩数据块和基于压缩文字段的压缩数据串。

公开(公告)号：US07013269B1

公开(公告)日：2006-03-14

申请号：US10073406

申请日：2002-02-13

申请人： Udaya Bhaskar ,  Kumar Swaminathan

发明人： Udaya Bhaskar ,  Kumar Swaminathan

IPC分类号： G10L19/02

CPC分类号： G10L19/097 ,  G10L25/93

摘要： A system and method is provided that employs a frequency domain interpolative CODEC system for low bit rate coding of speech which comprises a linear prediction (LP) front end adapted to process an input signal providing LP parameters which are quantized and encoded over predetermined intervals and used to compute a LP residual signal. An open loop pitch estimator adapted to process the LP residual signal, a pitch quantizer, and a pitch interpolator also provides a pitch contour within the predetermined intervals. A voice activity detector adapted to process the LP parameters and the open loop pitch contour over the predetermined intervals is also provided as well as a signal processor responsive to the LP residual signal and the pitch contour and adapted to perform the following functions: extract a prototype waveform (PW) from the LP residual and the open loop pitch contour for a number of equal sub-intervals within the predetermined invervals; normalize the PW by a gain value of the PW; encode a magnitude of the PW; and provide a voicing measure where the voicing measure characterizes a degree of vocing of the input speech signal and is derived from several input parameters that are correlated to degrees of periodicity of the signal over the predetermined intervals. The voicing measure is provided for the purpose of regenerating a PW phase at a decoder; and providing improved quantization of the PW magnitude at an encoder. The voicing measure is encoded jointly with a PW nonstationarity measure vector using a spectrally weighted vector quantizer having a codebook partioned based on a voiced and unvoiced mode.

摘要翻译： 提供了一种系统和方法，其采用用于语音的低比特率编码的频域内插编解码器系统，其包括线性预测（LP）前端，其适于处理提供经过预定间隔量化和编码的LP参数的输入信号，并使用 以计算LP残差信号。 适于处理LP残差信号的开环音调估计器，音调量化器和音调内插器也在预定间隔内提供音调轮廓。 还提供了适于在预定间隔上处理LP参数和开环音调轮廓的语音活动检测器以及响应于LP残差信号和音调轮廓的信号处理器，并且适于执行以下功能：提取原型 来自LP残差的波形（PW）和开环节距轮廓线，用于在预定的反相中的多个相等子间隔; 通过PW的增益值对PW进行归一化; 编码PW的大小; 并且提供发声测量，其中所述发声测量表征所述输入语音信号的声音程度，并且从与所述预定间隔上的所述信号的周期度相关的若干输入参数导出。 提供发声措施是为了在解码器处再生PW相; 并且在编码器处提供对PW幅度的改进的量化。 发声测量与PW非平稳测量向量一起编码，其使用具有基于有声和无声模式分组的码本的频谱加权矢量量化器。

公开(公告)号：US4809334A

公开(公告)日：1989-02-28

申请号：US71243

申请日：1987-07-09

申请人： Udaya Bhaskar

发明人： Udaya Bhaskar

IPC分类号： G10L25/90 ,  G10L5/00

CPC分类号： G10L25/90

摘要： A method of detecting and correcting received values of a pitch period estimate of a speech signal for use in a speech coder or the like. An average is calculated of the nonzero values of received pitch period estimate since the previous reset. If a current pitch period estimate is within a range of 0.75 to 1.25 times the average, it is assumed correct, while if not, a correction process is carried out. If correction is required successively for more than a preset number of times, which will most likely occur when the speaker changes, the average is discarded and a new average calculated.

摘要翻译： 一种检测和校正用于语音编码器等的语音信号的音调周期估计的接收值的方法。 计算自先前复位以来接收的音调周期估计的非零值的平均值。 如果当前的音调周期估计在平均值的0.75到1.25倍的范围内，则假设是正确的，而如果不是则执行校正处理。 如果连续需要校正超过预设次数，这将很可能在扬声器改变时发生，平均值被丢弃并计算新的平均值。

公开(公告)号：US08625775B2

公开(公告)日：2014-01-07

申请号：US12852341

申请日：2010-08-06

申请人： Udaya Bhaskar ,  Peng Lee

发明人： Udaya Bhaskar ,  Peng Lee

IPC分类号： H04M9/08 ,  G10K11/16 ,  A61F11/06

CPC分类号： H04M9/082

摘要： An echo cancelling algorithm in a communication device initializes a step size value used in an adaptive echo filter based on a background noise signal power level relative to a power level of a received signal and a power level of an echo estimate relative to an output of an echo canceller. The algorithm then adjusts the step size value. One aspect adjusts the step size based on the detection of large fast fourier transform values at one, or more, disturbing-signal frequencies. Another aspect estimates residual echo energy to adjust an estimated echo energy, which then is used to set a double talk flag if a transmit signal has much more power than the estimated echo signal. Another aspect compares transmit signal power to a decimated version of the transmit signal power and sets the double talk flag if the former exceeds the latter by a predetermined amount.

摘要翻译： 通信装置中的回波消除算法基于相对于接收信号的功率电平的背景噪声信号功率电平和相对于接收信号的输出的回波估计的功率电平来初始化在自适应回波滤波器中使用的步长值 回波消除器。 然后，该算法调整步长值。 一个方面基于在一个或多个干扰信号频率处检测大的快速傅立叶变换值来调整步长。 另一方面估计残余回波能量以调整估计的回波能量，其然后用于设置双方通话标志，如果发送信号具有比估计的回波信号多得多的功率。 另一方面将发送信号功率与发送信号功率的抽取版本进行比较，如果前者超过预定量，则设置双方通话标志。

公开(公告)号：US06996523B1

公开(公告)日：2006-02-07

申请号：US10073128

申请日：2002-02-13

申请人： Udaya Bhaskar ,  Kumar Swaminathan

发明人： Udaya Bhaskar ,  Kumar Swaminathan

IPC分类号： G10L19/10

CPC分类号： G10L19/097 ,  G10L19/032

摘要： A system and method is provided that employs a frequency domain interpolative CODEC system for low bit rate coding of speech which comprises a linear prediction (LP) front end adapted to process an input signal that provides LP parameters which are quantized and encoded over predetermined intervals and used to compute a LP residual signal. An open loop pitch estimator adapted to process the LP residual signal, a pitch quantizer, and a pitch interpolator and provide a pitch contour within the predetermined intervals is also provided. Also provided is a signal processor responsive to the LP residual signal and the pitch contour and adapted to perform the following: provide a voicing measure, where the voicing measure characterizes a degree of voicing of the input speech signal and is derived from several input parameters that are correlated to degrees of periodicity of the signal over the predetermined intervals; extract a prototype waveform (PW) from the LP residual and the open loop pitch contour for a number of equal sub-intervals within the predetermined intervals; normalize the PW by a gain value of the PW; encode a magnitude of the PW; and directly quantize the PW in a magnitude domain without further decomposition of the PW into complex components, where the direct quantization is performed by a hierarchical quantization method based on a voicing classification using fixed dimension vector quantizers (VQ's).

摘要翻译： 提供了一种系统和方法，其采用用于语音的低比特率编码的频域内插CODEC系统，其包括适于处理提供经过预定间隔量化和编码的LP参数的输入信号的线性预测（LP）前端，以及 用于计算LP残差信号。 还提供了适于处理LP残差信号的开环音调估计器，音调量化器和音调内插器，并且在预定间隔内提供音调轮廓。 还提供了响应于LP残留信号和音调轮廓的信号处理器，并且适于执行以下操作：提供语音测量，其中语音测量表征输入语音信号的发音程度，并且从几个输入参数导出， 与预定间隔的信号的周期度相关; 从所述LP残差和所述开环节距轮廓中提取所述预定间隔内的多个相等子间隔的原型波形（PW）; 通过PW的增益值对PW进行归一化; 编码PW的大小; 并且在幅度域中直接量化PW，而不会将PW进一步分解成复分量，其中通过使用固定维度矢量量化器（VQ's）的基于语音分类的分层量化方法来执行直接量化。

公开(公告)号：US06961320B1

公开(公告)日：2005-11-01

申请号：US09669283

申请日：2000-09-26

申请人： Kumar Swaminathan ,  Udaya Bhaskar

发明人： Kumar Swaminathan ,  Udaya Bhaskar

IPC分类号： H04L5/22 ,  H04M3/42 ,  H04M11/00 ,  H04M11/06

CPC分类号： H04M3/42391 ,  H04M11/066 ,  H04M2207/18

摘要： A method, system, and software product for transmitting TTY/TDD signals in a system employing low bit-rate voice compression are disclosed. The method includes receiving an input signal and generating a teletypewriter (TTY) indicator signal from the input signal. Whether or not the input signal is a TTY signal including a TTY character, is determined based on the TTY indicator signal. A TTY packet including the TTY character of the TTY signal is constructed and transmitted if the input signal is determined to be a TTY signal. A method, system, and software product for receiving and decoding TTY/TDD signal is also disclosed.

摘要翻译： 公开了一种在采用低比特率语音压缩的系统中传输TTY / TDD信号的方法，系统和软件产品。 该方法包括接收输入信号并从输入信号产生电传打字机（TTY）指示符信号。 是否基于TTY指示符信号确定输入信号是否包括TTY字符的TTY信号。 如果输入信号被确定为TTY信号，则构造并发送包括TTY信号的TTY字符的TTY分组。 还公开了用于接收和解码TTY / TDD信号的方法，系统和软件产品。

公开(公告)号：US20110033059A1

公开(公告)日：2011-02-10

申请号：US12852341

申请日：2010-08-06

申请人： Udaya Bhaskar ,  Peng Lee

发明人： Udaya Bhaskar ,  Peng Lee

IPC分类号： G10K11/16

CPC分类号： H04M9/082

摘要： An echo cancelling algorithm in a communication device initializes a step size value used in an adaptive echo filter based on a background noise signal power level relative to a power level of a received signal and a power level of an echo estimate relative to an output of an echo canceller. The algorithm then adjusts the step size value. One aspect adjusts the step size based on the detection of large fast fourier transform values at one, or more, disturbing-signal frequencies. Another aspect estimates residual echo energy to adjust an estimated echo energy, which then is used to set a double talk flag if a transmit signal has much more power than the estimated echo signal. Another aspect compares transmit signal power to a decimated version of the transmit signal power and sets the double talk flag if the former exceeds the latter by a predetermined amount.

摘要翻译： 通信装置中的回波消除算法基于相对于接收信号的功率电平的背景噪声信号功率电平和相对于接收信号的输出的回波估计的功率电平来初始化在自适应回波滤波器中使用的步长值 回波消除器。 然后，该算法调整步长值。 一个方面基于在一个或多个干扰信号频率处检测大的快速傅立叶变换值来调整步长。 另一方面估计残余回波能量以调整估计的回波能量，其然后用于设置双方通话标志，如果发送信号具有比估计的回波信号多得多的功率。 另一方面将发送信号功率与发送信号功率的抽取版本进行比较，如果前者超过预定量，则设置双方通话标志。