公开(公告)号：US08243695B2

公开(公告)日：2012-08-14

申请号：US12537906

申请日：2009-08-07

申请人： Khaled H. El-Maleh ,  Eddie-Lun Tik Choy ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco ,  Pengjun Huang

发明人： Khaled H. El-Maleh ,  Eddie-Lun Tik Choy ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco ,  Pengjun Huang

IPC分类号： H04B7/216 ,  G10L19/12 ,  H04L27/06

CPC分类号： H04L1/08 ,  H04L1/0046 ,  H04L1/201

摘要： A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.

摘要翻译： 一种用于在可变速率通信系统接收机中检测速率确定算法错误的系统和方法。 所公开的实施例防止速率确定算法错误引起可听见的伪影，例如吱吱声或嘟嘟声。 所公开的系统和方法检测具有错误确定的数据速率的帧，并执行帧擦除处理和/或存储器状态清理，以防止跨多个帧的失真传播。 通过检查非法速率转换，保留位，验证未使用的过滤器类型位组合以及分析固定代码簿增益和线性预测系数增益之间的关系来检测具有不正确确定的数据速率的帧。

公开(公告)号：US07590096B2

公开(公告)日：2009-09-15

申请号：US10938445

申请日：2004-09-09

申请人： Khaled H. El-Maleh ,  Eddie-Lun Tik Choy ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco ,  Pengjun Huang

发明人： Khaled H. El-Maleh ,  Eddie-Lun Tik Choy ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco ,  Pengjun Huang

IPC分类号： H04B7/216 ,  G10L19/12 ,  H04L27/06

CPC分类号： H04L1/08 ,  H04L1/0046 ,  H04L1/201

摘要： A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.

公开(公告)号：US06804218B2

公开(公告)日：2004-10-12

申请号：US09730147

申请日：2000-12-04

申请人： Khaled H. El-Maleh ,  Eddie-Lun Tik Choy ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco ,  Pengjun Huang

发明人： Khaled H. El-Maleh ,  Eddie-Lun Tik Choy ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco ,  Pengjun Huang

IPC分类号： H04B7216

CPC分类号： H04L1/08 ,  H04L1/0046 ,  H04L1/201

摘要： A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.

摘要翻译： 一种用于在可变速率通信系统接收机中检测速率确定算法错误的系统和方法。 所公开的实施例防止速率确定算法错误引起可听见的伪影，例如吱吱声或嘟嘟声。 所公开的系统和方法检测具有错误确定的数据速率的帧，并执行帧擦除处理和/或存储器状态清理，以防止跨多个帧的失真传播。 通过检查非法速率转换，保留位，验证未使用的过滤器类型位组合以及分析固定代码簿增益和线性预测系数增益之间的关系来检测具有不正确确定的数据速率的帧。

公开(公告)号：US20100036668A1

公开(公告)日：2010-02-11

申请号：US12537906

申请日：2009-08-07

申请人： Khaled H. El-Maleh ,  Eddie-Lun Tik Choy ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DaJaco ,  Pengjun Huang

发明人： Khaled H. El-Maleh ,  Eddie-Lun Tik Choy ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DaJaco ,  Pengjun Huang

IPC分类号： G10L11/00

CPC分类号： H04L1/08 ,  H04L1/0046 ,  H04L1/201

摘要： A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.

摘要翻译： 一种用于在可变速率通信系统接收机中检测速率确定算法错误的系统和方法。 所公开的实施例防止速率确定算法错误引起可听见的伪影，例如吱吱声或嘟嘟声。 所公开的系统和方法检测具有错误确定的数据速率的帧，并执行帧擦除处理和/或存储器状态清理，以防止跨多个帧的失真传播。 通过检查非法速率转换，保留位，验证未使用的过滤器类型位组合以及分析固定代码簿增益和线性预测系数增益之间的关系来检测具有不正确确定的数据速率的帧。

公开(公告)号：US20090281796A1

公开(公告)日：2009-11-12

申请号：US12501196

申请日：2009-07-10

申请人： Khaled H. El-Maleh ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. Dejaco

发明人： Khaled H. El-Maleh ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. Dejaco

IPC分类号： G10L19/14

CPC分类号： G10L21/038 ,  G10L19/26

摘要： Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.

摘要翻译： 如果传输介质或目标终端用窄带约束构成，则宽带语音信号必须转换为窄带语音信号。 典型的宽带至窄带转换方法是使用低通滤波器和下采样器消除3400Hz以上的频率。 然而，该方法产生消声语音，因为所得到的窄带信号具有平坦的频率响应。 这里呈现了增强宽带到窄带转换信号的声学质量的方法和装置。 带宽切换滤波器用于强调宽带信号的中等频率部分，使得所得到的窄带信号具有非平坦频谱。

公开(公告)号：US07113522B2

公开(公告)日：2006-09-26

申请号：US09771508

申请日：2001-01-24

申请人： Khaled H. El-Maleh ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco

发明人： Khaled H. El-Maleh ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco

IPC分类号： H04J1/00 ,  G10L11/06 ,  G10L21/00

CPC分类号： G10L21/038 ,  G10L19/26

摘要： Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.

公开(公告)号：US07577563B2

公开(公告)日：2009-08-18

申请号：US11534327

申请日：2006-09-22

申请人： Khaled H. El-Maleh ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco

发明人： Khaled H. El-Maleh ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco

IPC分类号： H04W7/216 ,  G10L19/00 ,  G10L19/14

CPC分类号： G10L21/038 ,  G10L19/26

摘要： Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.

摘要翻译： 如果传输介质或目标终端用窄带约束构成，则宽带语音信号必须转换为窄带语音信号。 典型的宽带至窄带转换方法是使用低通滤波器和下采样器消除3400Hz以上的频率。 然而，该方法产生消声语音，因为所得到的窄带信号具有平坦的频率响应。 这里呈现了增强宽带到窄带转换信号的声学质量的方法和装置。 带宽切换滤波器用于强调宽带信号的中等频率部分，使得所得到的窄带信号具有非平坦频谱。

公开(公告)号：US08358617B2

公开(公告)日：2013-01-22

申请号：US12501196

申请日：2009-07-10

申请人： Khaled H. El-Maleh ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco

发明人： Khaled H. El-Maleh ,  Arasanipalai K. Ananthapadmanabhan ,  Andrew P. DeJaco

IPC分类号： H04W4/00 ,  G10L19/12 ,  G10L21/02

CPC分类号： G10L21/038 ,  G10L19/26

摘要： Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.