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1. 发明申请

US20120183034A1 Spectrally constrained impulse shortening filter for a discrete multi-tone receiver 审中-公开
标题翻译：用于离散多音调接收机的频谱约束脉冲缩短滤波器
公开(公告)号：US20120183034A1
公开(公告)日：2012-07-19
申请号：US13374524
申请日：2011-12-30
申请人： Gopal Harikumar , Daniel Marchok
发明人： Gopal Harikumar , Daniel Marchok
IPC分类号： H04B17/00
CPC分类号： H04L25/03012 , H04L2025/03414
摘要： A channel in a multiple carrier communication system is equalized by computing a target spectral response, shortening the impulse response of the channel so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length and filtering the signal based on the target spectral response.
摘要翻译：通过计算目标频谱响应来平衡多载波通信系统中的信道，缩短信道的脉冲响应，使得脉冲响应的大部分能量被限制在比目标长度短的区域并且过滤基于目标光谱响应的信号。

2. 发明申请

US20090022216A1 SPECTRALLY CONSTRAINED IMPULSE SHORTENING FILTER FOR A DISCRETE MULTI-TONE RECEIVER 有权
公开(公告)号：US20090022216A1
公开(公告)日：2009-01-22
申请号：US12238140
申请日：2008-09-25
申请人： Gopal Harikumar , Daniel Marchok
发明人： Gopal Harikumar , Daniel Marchok
IPC分类号： H04B1/38 , H04B1/10
CPC分类号： H04L25/03012 , H04L2025/03414
摘要： A channel in a multiple carrier communication system is equalized by computing a target spectral response, shortening the impulse response of the channel so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length and filtering the signal based on the target spectral response.

3. 发明申请

US20060098808A1 Synchronization of echo cancellers in a voice processing system 有权
公开(公告)号：US20060098808A1
公开(公告)日：2006-05-11
申请号：US11293912
申请日：2005-12-05
申请人： Daniel Marchok , Richard Younce , Charles Gritton , Ravi Chandran
发明人： Daniel Marchok , Richard Younce , Charles Gritton , Ravi Chandran
IPC分类号： H04M9/08
CPC分类号： G10L25/78 , G10L15/30 , G10L19/012 , G10L19/18 , G10L21/0364 , G10L2021/02082 , H04B3/23 , H04M9/082
摘要： Methods and apparatus for processing a received voice signal from a variable-delay network by a communications system that has at least one echo canceller. An echo canceller determines delay characteristics that are associated with the received voice signal and correspondingly modifies echo cancellation processing. In a variation of the embodiment of the invention, a first echo canceller sends silence descriptor information to a second echo canceller. The second echo canceller reconstructs a voice signal based upon the silence descriptor information and excitation vector information.

4. 发明申请

US20060034166A1 Apparatus and method for symbol alignment in a multi-point OFDM/DMT digital communications system 审中-公开
标题翻译：在多点OFDM / DMT数字通信系统中的符号对准的装置和方法
公开(公告)号：US20060034166A1
公开(公告)日：2006-02-16
申请号：US11201853
申请日：2005-08-11
申请人： Daniel Marchok , Richard Younce , Samir Kapoor , Peter Melsa
发明人： Daniel Marchok , Richard Younce , Samir Kapoor , Peter Melsa
IPC分类号： H04J11/00
CPC分类号： H04L27/2657 , H04L5/023 , H04L5/1453 , H04L27/2602 , H04L27/2662
摘要： A multi-point communications system that is set forth herein. The communication system comprises a head end unit disposed at a primary site and a plurality of receivers disposed at remote sites. The head end unit includes a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are transmitted in periodically occurring formatted symbol frames. The cyclic prefix includes a predetermined periodic signal superimposed thereon. The receivers receive the OFDM/DMT symbols over a subset of the predetermined number of bins from the transmission medium and use the superimposed signals to attain symbol alignment.
摘要翻译：本文中阐述的多点通信系统。通信系统包括设置在主站点处的头端单元和设置在远程站点处的多个接收器。头端单元包括用于通过传输介质在预定数量的箱上发送OFDM / DMT符号的发射机。 OFDM / DMT符号以周期性出现的格式化符号帧发送。循环前缀包括叠加在其上的预定周期信号。接收机在来自传输介质的预定数量的分组的子集上接收OFDM / DMT符号，并使用叠加的信号来获得符号对准。

5. 发明授权

US06631175B2 Spectrally constrained impulse shortening filter for a discrete multi-tone receiver 失效
标题翻译：用于离散多音调接收机的频谱约束脉冲缩短滤波器
公开(公告)号：US06631175B2
公开(公告)日：2003-10-07
申请号：US09054468
申请日：1998-04-03
申请人： Gopal Harikumar , Daniel Marchok
发明人： Gopal Harikumar , Daniel Marchok
IPC分类号： H04B110
CPC分类号： H04L25/03012 , H04L2025/03414
摘要： A channel in a multiple carrier communication system is equalized by computing a target spectral response, shortening the impulse response of the channel so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length and filtering the signal based on the target spectral response.
摘要翻译：通过计算目标频谱响应来平衡多载波通信系统中的信道，缩短信道的脉冲响应，使得脉冲响应的大部分能量被限制在比目标长度短的区域并且过滤基于目标光谱响应的信号。

6. 发明授权

US07254178B2 Spectrally constrained impulse shortening filter for a discrete multi-tone receiver 有权
标题翻译：用于离散多音调接收机的频谱约束脉冲缩短滤波器
公开(公告)号：US07254178B2
公开(公告)日：2007-08-07
申请号：US10608329
申请日：2003-06-27
申请人： Gopal Harikumar , Daniel Marchok
发明人： Gopal Harikumar , Daniel Marchok
IPC分类号： H04K1/10 , H04B1/10
CPC分类号： H04L25/03012 , H04L2025/03414
摘要： A channel in a multiple carrier communication system is equalized by computing a target spectral response, shortening the impulse response of the channel so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length and filtering the signal based on the target spectral response.
摘要翻译：通过计算目标频谱响应来平衡多载波通信系统中的信道，缩短信道的脉冲响应，使得脉冲响应的大部分能量被限制在比目标长度短的区域并且过滤基于目标光谱响应的信号。

7. 发明申请

US20060247923A1 Communication system noise cancellation power signal calculation techniques 有权
公开(公告)号：US20060247923A1
公开(公告)日：2006-11-02
申请号：US11476309
申请日：2006-06-28
申请人： Ravi Chandran , Bruce Dunne , Daniel Marchok
发明人： Ravi Chandran , Bruce Dunne , Daniel Marchok
IPC分类号： G10L19/14
CPC分类号： G10L21/0208 , G10L19/0204 , G10L21/02 , G10L21/0232
摘要： In order to enhance the quality of a communication signal derived from speech and noise, a filter divides the communication signal into a plurality of frequency band signals. A calculator generates a plurality of power band signals each having a power band value and corresponding to one of the frequency band signals. The power band values are based on estimating, over a time period, the power of one of the frequency band signals. The time period is different for different ones of the frequency band signals. The power band values are used to calculate weighting factors which are used to alter the frequency band signals that are combined to generate an improved communication signal.

8. 发明申请

US20070230562A1 SPECTRALLY CONSTRAINED IMPULSE SHORTENING FILTER FOR A DISCRETE MULTI-TONE RECEIVER 有权
标题翻译：用于离散多音调接收机的频谱约束脉冲滤波器
公开(公告)号：US20070230562A1
公开(公告)日：2007-10-04
申请号：US11759789
申请日：2007-06-07
申请人： Gopal Harikumar , Daniel Marchok
发明人： Gopal Harikumar , Daniel Marchok
IPC分类号： H04L1/00
CPC分类号： H04L25/03012 , H04L2025/03414
摘要： A channel in a multiple carrier communication system is equalized by computing a target spectral response, shortening the impulse response of the channel so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length and filtering the signal based on the target spectral response.
摘要翻译：通过计算目标频谱响应来平衡多载波通信系统中的信道，缩短信道的脉冲响应，使得脉冲响应的大部分能量被限制在比目标长度短的区域并且过滤基于目标光谱响应的信号。

9. 发明申请

US20070064817A1 Audio enhancement communication techniques 有权
标题翻译：音频增强通信技术
公开(公告)号：US20070064817A1
公开(公告)日：2007-03-22
申请号：US11602837
申请日：2006-11-21
申请人： Bruce Dunne , Ravi Chandran , Daniel Marchok
发明人： Bruce Dunne , Ravi Chandran , Daniel Marchok
IPC分类号： H04B1/66
CPC分类号： G10L19/18 , G10L21/0364 , H04B1/66
摘要： A communication system (10) receives a communication signal comprising first and second data with different compression levels, such as highly compressed and weakly compressed levels. A mode detector (15) detects the level of compression. One or more signal decoders (20, 22) decode the highly compressed data. An analyzer (30) determines the type of enhancement required. One or more processors (48, 50, 80) enhance the data as required. An encoder (60) reencodes the enhanced decoded data. Metrics (90) may aid the operation of the analyzer (30). The communication system may include telephones (120, 122, 124, 126). Processors (103, 104) enhance signals in opposite first and second directions between pairs of the telephones. A path (106) connects the processors in tandem. One or more switches (101, 102) disable signal enhancement for one of the processors depending on the compression level of the signals to avoid degrading call quality.
摘要翻译：通信系统（10）接收包括具有不同压缩级别的第一和第二数据的通信信号，例如高度压缩和弱压缩的级别。模式检测器（15）检测压缩水平。一个或多个信号解码器（20,22）对高度压缩的数据进行解码。分析器（30）确定所需的增强类型。一个或多个处理器（48,50,80）根据需要增强数据。编码器（60）对增强的解码数据进行重新编码。度量（90）可以帮助分析仪（30）的操作。通信系统可以包括电话（120,122,124,126）。处理器（103,104）在成对的电话之间的相对的第一和第二方向增强信号。路径（106）串联连接处理器。取决于信号的压缩级别，一个或多个开关（101,102）禁止一个处理器的信号增强，以避免降低呼叫质量。

10. 发明授权

US07039181B2 Consolidated voice activity detection and noise estimation 有权
标题翻译：综合语音活动检测和噪声估计
公开(公告)号：US07039181B2
公开(公告)日：2006-05-02
申请号：US10331852
申请日：2002-12-30
申请人： Daniel Marchok , Richard Younce , Charles Gritton
发明人： Daniel Marchok , Richard Younce , Charles Gritton
IPC分类号： H04M9/08
CPC分类号： G10L25/78 , G10L15/30 , G10L19/012 , G10L19/18 , G10L21/0364 , G10L2021/02082 , H04B3/23 , H04M9/082
摘要： Methods and apparatus compensating for background noise associated with a transmitted signal. In a first embodiment, an adder combines an echo estimate with the the transmitted signal to form a processed signal, a noise reduction circuit uses a background noise estimate to subtract the background noise from the processed signal, and a non-linear processor uses the background noise estimate to combine a compensating background noise signal with the proccssed signal. In another embodiment, the noise reduction circuit divides the processed signal into sub-bands. With variations of an embodiment, the nonlinear processor is a sub-band non-linear processor, the processed signal is divided into sub-bands, and the background estimate includes sub-band noise estimates.
摘要翻译：补偿与发射信号相关的背景噪声的方法和装置。在第一实施例中，加法器将回波估计与所发送的信号组合以形成经处理的信号，噪声降低电路使用背景噪声估计来从经处理的信号中减去背景噪声，非线性处理器使用背景噪声估计来将补偿背景噪声信号与经验信号组合。在另一个实施例中，噪声降低电路将经处理的信号划分成子带。利用实施例的变型，非线性处理器是子带非线性处理器，处理后的信号被划分为子带，背景估计包括子带噪声估计。

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