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1. 发明授权

US08243759B2 Clock recovery method over packet switched networks based on network quiet period detection 有权
标题翻译：基于网络安静时段检测的分组交换网络的时钟恢复方法
公开(公告)号：US08243759B2
公开(公告)日：2012-08-14
申请号：US13015381
申请日：2011-01-27
申请人： Kamran Rahbar
发明人： Kamran Rahbar
IPC分类号： H04J3/06
CPC分类号： H04J3/0664
摘要： A method of recovering timing information in a packet network, involves detecting quiet periods in the packet network when network packet delay variation (PDV) is low. A frequency prediction unit is trained during the quiet periods to learn output clock variations of a timing recovery unit to permit the frequency prediction unit to predict frequency update values for a local oscillator during non quiet periods taking into account the historical output clock variations during quiet periods. The output of the frequency prediction unit is used as the active frequency update values during non quiet periods.
摘要翻译：一种在分组网络中恢复定时信息的方法涉及当网络分组延迟变化（PDV）低时检测分组网络中的静默时段。在静默期间训练频率预测单元以学习定时恢复单元的输出时钟变化，以允许频率预测单元在非安静时段期间预测本地振荡器的频率更新值，同时考虑到安静时段期间的历史输出时钟变化。频率预测单元的输出用作非静音期间的有效频率更新值。

2. 发明授权

US08023641B2 Spectral domain, non-linear echo cancellation method in a hands-free device 有权
标题翻译：免提装置中的光谱域，非线性回波消除方法
公开(公告)号：US08023641B2
公开(公告)日：2011-09-20
申请号：US12058846
申请日：2008-03-31
申请人： Kamran Rahbar
发明人： Kamran Rahbar
IPC分类号： H04M9/08
CPC分类号： H04M9/082
摘要： Disclosed is a non-linear echo canceller and method for cancelling echo during full duplex communication in a hands free communication system. An input signal from a far-end talker and an input signal from the output from an echo canceller are received. K spectral subbands are created for each input signal. The spectral echo residual power at each subband is estimated and compared to a clean signal power to calculate a signal to echo ratio. Gains are calculated based on each calculated ratio and non-linear echo is cancelled based on the calculated gains.
摘要翻译：公开了一种在免提通信系统中在全双工通信期间消除回波的非线性回声消除器和方法。来自远端讲话者的输入信号和来自回声消除器的输出的输入信号被接收。为每个输入信号创建K个频谱子带。估计每个子带处的光谱回波残余功率，并将其与干净的信号功率进行比较以计算信号与回波比。基于每个计算的比率计算收益，并且基于所计算的收益来取消非线性回波。

3. 发明申请

US20100296406A1 TIMING RECOVERY OVER PACKET NETWORKS 有权
标题翻译：定时恢复分组网络
公开(公告)号：US20100296406A1
公开(公告)日：2010-11-25
申请号：US12774893
申请日：2010-05-06
申请人： Kamran Rahbar
发明人： Kamran Rahbar
IPC分类号： H04L12/26
CPC分类号： H04J3/0697 , G06F1/14 , H04J3/0664 , H04L7/0008 , H04L41/142 , H04L43/0858 , H04L43/0864 , H04L43/106 , H04L47/28
摘要： In a method of recovering timing information over packet networks, raw network delays are measured using timing packets sent between a transmitter and receiver. The expected delay is predicted using a minimum statistics adaptive filter to track local minima of measured time delays over a smoothing window. Only those incoming timing packets which meet a particular criterion relative to the expected delay within a smoothing window are selected, and a local clock is adjusted based on the measured timing delays from the selected timing packets.
摘要翻译：在通过分组网络恢复定时信息的方法中，使用在发射机和接收机之间发送的定时分组来测量原始网络延迟。使用最小统计自适应滤波器来预测期望的延迟，以跟踪在平滑窗口上测量的时间延迟的局部最小值。仅选择满足相对于平滑窗口内的预期延迟的特定标准的那些输入定时分组，并且基于从所选择的定时分组测量的定时延迟来调整本地时钟。

4. 发明授权

US08483244B2 Timing recovery over packet networks 有权
标题翻译：通过分组网络进行定时恢复
公开(公告)号：US08483244B2
公开(公告)日：2013-07-09
申请号：US12774893
申请日：2010-05-06
申请人： Kamran Rahbar
发明人： Kamran Rahbar
IPC分类号： H04J3/06 , H04L7/00
CPC分类号： H04J3/0697 , G06F1/14 , H04J3/0664 , H04L7/0008 , H04L41/142 , H04L43/0858 , H04L43/0864 , H04L43/106 , H04L47/28
摘要： In a method of recovering timing information over packet networks, raw network delays are measured using timing packets sent between a transmitter and receiver. The expected delay is predicted using a minimum statistics adaptive filter to track local minima of measured time delays over a smoothing window. Only those incoming timing packets which meet a particular criterion relative to the expected delay within a smoothing window are selected, and a local clock is adjusted based on the measured timing delays from the selected timing packets.
摘要翻译：在通过分组网络恢复定时信息的方法中，使用在发射机和接收机之间发送的定时分组来测量原始网络延迟。使用最小统计自适应滤波器来预测期望的延迟，以跟踪在平滑窗口上测量的时间延迟的局部最小值。仅选择满足相对于平滑窗口内的预期延迟的特定标准的那些输入定时分组，并且基于从所选择的定时分组测量的定时延迟来调整本地时钟。

5. 发明授权

US08335319B2 Double talk detection method based on spectral acoustic properties 有权
标题翻译：基于光谱声学特性的双通道检测方法
公开(公告)号：US08335319B2
公开(公告)日：2012-12-18
申请号：US12117779
申请日：2008-05-09
申请人： Kamran Rahbar
发明人： Kamran Rahbar
IPC分类号： H04B3/20 , H04B15/00 , H04M9/08
CPC分类号： H04M9/082
摘要： A method of detecting double talk condition in hands free communication devices is disclosed. In general, the method in accordance with the teachings of this invention detects double talk conditions based on inherent frequency response differences between the transducers used and acoustical effect on the spectrum of the returned echo signal. An input signal from a far-end talker and an input signal from the output from an echo canceler are received by the detector. K spectral subbands are created for each input signal. From this K subbands q subbands are selected based on inherent frequency differences between the far-end transducer and a near-end transducer. The spectral echo residual power is estimated at each subband. The estimated spectral echo power and the output signal from the echo canceler for a selected subband are compared to a predetermined threshold. Based on this comparison, it is determined whether double talk conditions exist based on the comparison.
摘要翻译：公开了一种在免提通信装置中检测双方通话状况的方法。通常，根据本发明的教导的方法基于所使用的换能器之间的固有频率响应差异和对所返回的回波信号的频谱的声学效应来检测双重通话条件。来自远端讲话者的输入信号和来自回波消除器的输出的输入信号由检测器接收。为每个输入信号创建K个频谱子带。根据该K个子带，基于远端换能器和近端换能器之间的固有频率差选择q个子带。在每个子带估计光谱回波剩余功率。将来自所选子带的来自回波消除器的估计的光谱回波功率和输出信号与预定阈值进行比较。基于这种比较，基于比较确定是否存在双方谈话条件。

6. 发明申请

US20080247536A1 Spectral domain, non-linear echo cancellation method in a hands-free device 有权
标题翻译：免提装置中的光谱域，非线性回波消除方法
公开(公告)号：US20080247536A1
公开(公告)日：2008-10-09
申请号：US12058846
申请日：2008-03-31
申请人： Kamran Rahbar
发明人： Kamran Rahbar
IPC分类号： H04M9/08
CPC分类号： H04M9/082
摘要： Disclosed is a non-linear echo canceller and method for cancelling echo during full duplex communication in a hands free communication system. An input signal from a far-end talker and an input signal from the output from an echo canceller are received. K spectral subbands are created for each input signal. The spectral echo residual power at each subband is estimated and compared to a clean signal power to calculate a signal to echo ratio. Gains are calculated based on each calculated ratio and non-linear echo is cancelled based on the calculated gains.
摘要翻译：公开了一种在免提通信系统中在全双工通信期间消除回波的非线性回声消除器和方法。来自远端讲话者的输入信号和来自回声消除器的输出的输入信号被接收。为每个输入信号创建K个频谱子带。估计每个子带处的光谱回波残余功率，并将其与干净的信号功率进行比较以计算信号与回波比。基于每个计算的比率计算收益，并且基于所计算的收益来取消非线性回波。

7. 发明授权

US08971548B2 Motor noise reduction circuit 有权
标题翻译：电机降噪电路
公开(公告)号：US08971548B2
公开(公告)日：2015-03-03
申请号：US13316902
申请日：2011-12-12
申请人： Kamran Rahbar , Dean Morgan
发明人： Kamran Rahbar , Dean Morgan
IPC分类号： H04B15/00 , G03B31/00 , H04R3/00 , G10L21/0264 , G10L21/0224 , G10L21/0216
CPC分类号： G03B31/00 , G10L21/0224 , G10L21/0264 , G10L2021/02166 , H04R3/005 , H04R2430/20
摘要： A method of reducing noise in an environment where the noise source is in a fixed location relative to a pair of microphones, such as in a camera with a zoom motor, involves receiving signals x1(t), x2(t) from the respective microphones, and filtering each of the signals x1(t), x2(t) with respective first and second linear filters having filter coefficients obtained by computing eigenfilters corresponding to data samples from the respective microphones for noise only and signal only conditions.
摘要翻译：在噪声源相对于一对麦克风位于固定位置的环境中降低噪声的方法，例如在具有变焦电机的照相机中，涉及从相应麦克风接收信号x1（t），x2（t）并且对具有通过计算对应于来自各个麦克风的数据样本的本征滤波器获得的具有滤波器系数的各个第一和第二线性滤波器的每个信号x1（t），x2（t）进行滤波，仅用于噪声和仅信号条件。

8. 发明授权

US08599986B2 Phase locked loop with optimal state feedback controller 有权
标题翻译：具有最佳状态反馈控制器的锁相环
公开(公告)号：US08599986B2
公开(公告)日：2013-12-03
申请号：US12605974
申请日：2009-10-26
申请人： Kamran Rahbar
发明人： Kamran Rahbar
IPC分类号： H03D3/24
CPC分类号： H04J3/0664 , H03L7/085 , H03L7/093 , H03L7/0991
摘要： In a method of recovering timing information over a packet network at a local receiver, timing information is received at intervals timing from a remote source and compared with a locally generated clock signal to generate an input signal y(k) subject to noise representative of the phase difference between the source clock signal and the local receiver clock signal. The input signal is applied to a state feedback controller, preferably including a Kalman filter, to generate a control signal with reduced noise. The control signal is used to control an oscillator in a way so as to reduce the phase difference and generate a slave clock.
摘要翻译：在通过本地接收机的分组网络恢复定时信息的方法中，以远程源的间隔定时接收定时信息，并将其与本地生成的时钟信号进行比较，以产生受代表噪声的噪声的输入信号y（k）源时钟信号和本地接收机时钟信号之间的相位差。输入信号被施加到优选地包括卡尔曼滤波器的状态反馈控制器，以产生具有降低的噪声的控制信号。控制信号用于控制振荡器，以减少相位差并产生从时钟。

9. 发明申请

US20120154610A1 MOTOR NOISE REDUCTION CIRCUIT 有权
标题翻译：电机噪声减少电路
公开(公告)号：US20120154610A1
公开(公告)日：2012-06-21
申请号：US13316902
申请日：2011-12-12
申请人： Kamran Rahbar , Dean Morgan
发明人： Kamran Rahbar , Dean Morgan
IPC分类号： H04N5/225 , H04B15/00
CPC分类号： G03B31/00 , G10L21/0224 , G10L21/0264 , G10L2021/02166 , H04R3/005 , H04R2430/20
摘要： A method of reducing noise in an environment where the noise source is in a fixed location relative to a pair of microphones, such as in a camera with a zoom motor, involves receiving signals x1(t), x2(t) from the respective microphones, and filtering each of the signals x1(t), x2(t) with respective first and second linear filters having filter coefficients obtained by computing eigenfilters corresponding to data samples from the respective microphones for noise only and signal only conditions.
摘要翻译：在噪声源相对于一对麦克风位于固定位置的环境中降低噪声的方法，例如在具有变焦电机的照相机中，涉及从相应麦克风接收信号x1（t），x2（t）并且对具有通过计算对应于来自各个麦克风的数据样本的本征滤波器获得的具有滤波器系数的各个第一和第二线性滤波器的每个信号x1（t），x2（t）进行滤波，仅用于噪声和仅信号条件。

10. 发明申请

US20100296524A1 MULTI INPUT TIMING RECOVERY OVER PACKET NETWORK 有权
标题翻译：多个输入时序恢复分组网络
公开(公告)号：US20100296524A1
公开(公告)日：2010-11-25
申请号：US12773622
申请日：2010-05-04
申请人： Kamran Rahbar
发明人： Kamran Rahbar
IPC分类号： H04J3/06
CPC分类号： H04J3/0667 , H04J3/0644 , H04J3/0661 , H04J3/0679 , H04J3/0682 , H04L7/0331 , H04L43/0852 , H04L43/087 , H04L43/106 , H04L47/283
摘要： In a method of recovering timing information over packet networks, a receiver receives a plurality of packet streams over different paths from the same source. The raw delays experienced by the timing packets for each stream are filtered to provide a filtered delay for each stream. The filtered delays are weighted based on the quality of each stream, and the weighted filtered delays are then combined to form an aggregate delay estimate. Frequency adjustments for a local clock at the receiver are derived from the aggregate delay estimate.
摘要翻译：在通过分组网络恢复定时信息的方法中，接收机通过不同路径从同一个源接收多个分组流。对每个流的定时分组所经历的原始延迟进行过滤，以为每个流提供经过滤波的延迟。基于每个流的质量对滤波的延迟进行加权，然后组合加权滤波的延迟以形成聚合延迟估计。接收机本地时钟的频率调整来自总延迟估计。

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