利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

10 条记录 (耗时 0.011 秒)

    Clock recovery method over packet switched networks based on network quiet period detection
    1.
    发明公开
    Clock recovery method over packet switched networks based on network quiet period detection 有权
    Taktwiedergewinnngsverfahren在基于网络的检测静态周期的分组交换网络

    公开(公告)号：EP2360861A3

    公开(公告)日：2012-12-19

    申请号：EP11153278.4

    申请日：2011-02-04

    申请人： Zarlink Semiconductor Inc.

    发明人： Rahbar, Kamran

    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.

    Timing recovery over packet networks
    3.
    发明公开
    Timing recovery over packet networks 审中-公开
    TaktrückgewinnungüberPaketnetzwerke

    公开(公告)号：EP2254278A1

    公开(公告)日：2010-11-24

    申请号：EP10163404.6

    申请日：2010-05-20

    申请人： Zarlink Semiconductor Inc.

    发明人： Rahbar, Kamran

    IPC分类号： H04L12/26 ,  H04J3/06

    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 (1000) 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（1000）来预测期望的延迟，以跟踪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，并且基于从所选定时分组测量的定时延迟来调整本地时钟。

    Multi input timing recovery over packet networks
    4.
    发明公开
    Multi input timing recovery over packet networks 有权
    Taktrückgewinnungmit mehrfacher EingabeüberPaketnetzwerke

    公开(公告)号：EP2254267A1

    公开(公告)日：2010-11-24

    申请号：EP10163407.9

    申请日：2010-05-20

    申请人： Zarlink Semiconductor Inc.

    发明人： Rahbar, Kamran

    IPC分类号： H04J3/06 ,  H04L12/26

    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，然后将加权滤波的延迟组合以形成聚合延迟估计。 接收机本地时钟的频率调整是从总延迟估计得出的。

    Clock recovery method over packet switched networks based on network quiet period detection
    5.
    发明公开
    Clock recovery method over packet switched networks based on network quiet period detection 有权
    基于在网络中检测的静默周期的在分组交换网络时钟恢复方法

    公开(公告)号：EP2360861A2

    公开(公告)日：2011-08-24

    申请号：EP11153278.4

    申请日：2011-02-04

    申请人： Zarlink Semiconductor Inc.

    发明人： Rahbar, Kamran

    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： 回收分组网络的定时信息的方法，包括检测在所述分组网络分组延迟变化安静时段当网络（PDV）是低的。 频率预测单元在所述安静周期训练学习的定时恢复单元的输出时钟变化，以允许频率预测单元，预测频率更新值期间在安静期间考虑到历史输出时钟变化非静默周期的本机振荡器 ， 频率预测单元的输出被用作在非安静时段活性频率updateValues。

    Spectral Domain, Non-Linear Echo Cancellation Method in a Hands-Free Device
    6.
    发明公开
    Spectral Domain, Non-Linear Echo Cancellation Method in a Hands-Free Device 审中-公开
    频谱域，而不是线顷Echoabbruchsverfahren和免提设备

    公开(公告)号：EP1978649A3

    公开(公告)日：2008-12-31

    申请号：EP08154057.7

    申请日：2008-04-04

    申请人： Zarlink Semiconductor Inc.

    发明人： Rahbar, Kamran

    IPC分类号： H04B3/23

    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 canceleld based on the calculated gains.

    Double talk detection method based on spectral acoustic properties
    7.
    发明公开
    Double talk detection method based on spectral acoustic properties 有权
    Doppelsprecherkennungsverfahren basierend auf akustischen Spektraleigenschaften

    公开(公告)号：EP1998539A2

    公开(公告)日：2008-12-03

    申请号：EP08156983.2

    申请日：2008-05-27

    申请人： Zarlink Semiconductor Inc.

    发明人： Rahbar, Kamran

    IPC分类号： 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 canceller 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 canceller 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向通话状态的方法。 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方谈话条件。 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。 从该K个子带中，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。 将所选择的子带的估计的光谱回波功率和来自回波消除器的输出信号与预定阈值进行比较。 基于该比较，基于比较来确定是否存在双重通话条件。

    Double talk detection method based on spectral acoustic properties
    9.
    发明公开
    Double talk detection method based on spectral acoustic properties 有权
    基于声谱双说话人识别方法

    公开(公告)号：EP1998539A3

    公开(公告)日：2009-11-18

    申请号：EP08156983.2

    申请日：2008-05-27

    申请人： Zarlink Semiconductor Inc.

    发明人： Rahbar, Kamran

    IPC分类号： 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 canceller 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 canceller 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.

    Spectral Domain, Non-Linear Echo Cancellation Method in a Hands-Free Device
    10.
    发明公开
    Spectral Domain, Non-Linear Echo Cancellation Method in a Hands-Free Device 审中-公开
    频谱域，免提设备中的非线性回声消除方法

    公开(公告)号：EP1978649A2

    公开(公告)日：2008-10-08

    申请号：EP08154057.7

    申请日：2008-04-04

    申请人： Zarlink Semiconductor Inc.

    发明人： Rahbar, Kamran

    IPC分类号： H04B3/23

    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 canceleld based on the calculated gains.

    摘要翻译： 公开了一种用于在免提通信系统中的全双工通信期间消除回声的非线性回声消除器和方法。 接收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。 为每个输入信号创建K个频谱子带。 估计每个子带处的频谱回波剩余功率，并与干净信号功率进行比较以计算信号与回波比。 根据每个计算的比率计算增益，并基于计算的增益非线性回声被取消。