公开(公告)号：WO2007095624A2

公开(公告)日：2007-08-23

申请号：PCT/US2007/062250

申请日：2007-02-15

Applicant: QUALCOMM INCORPORATED ,  WANG, Song ,  CHOY, Eddie L.T. ,  KULKAMI, Prajakt, V. ,  GUPTA, Samir, Kumar

Inventor： WANG, Song ,  CHOY, Eddie L.T. ,  KULKAMI, Prajakt, V. ,  GUPTA, Samir, Kumar

IPC: H03H17/06

CPC classification number: H03H17/0685 ,  H03H17/0294

Abstract: Techniques are described for sampling rate conversion in the digital domain by up-sampling and down-sampling a digital signal according to a selected intermediate sampling frequency. A prototype anti-aliasing filter that has a bandwidth with multiple factors is stored in memory. The techniques include selecting an intermediate sampling frequency to be an integer multiple of a desired output sampling frequency of a digital signal based on the factors of the prototype filter, and selecting a down-sampling factor to be the same integer associated with the selected intermediate sampling frequency. A filter generator generates an anti-aliasing filter for the selected down-sampling factor based on the prototype filter. A sampling rate converter up-samples the digital signal at an input sampling frequency to the selected intermediate sampling frequency, filters the digital signal with the derived anti-aliasing filter, and down-samples the digital signal by the selected down-sampling factor to the desired output sampling frequency.

Abstract translation: 通过根据选择的中间采样频率对数字信号进行上采样和下采样来描述数字域中的采样率转换的技术。 具有多种因素带宽的原型抗混叠滤波器存储在内存中。 该技术包括基于原型滤波器的因子来选择中间采样频率为数字信号的期望输出采样频率的整数倍，并且选择下采样因子为与所选择的中间采样相关联的相同整数 频率。 滤波器生成器基于原型滤波器为选定的下采样因子生成抗混叠滤波器。 采样率转换器将输入采样频率的数字信号上采样到选定的中间采样频率，用导出的抗混叠滤波器对数字信号进行滤波，并将数字信号通过选择的下采样因子下采样到 所需的输出采样频率。

公开(公告)号：WO2017023482A1

公开(公告)日：2017-02-09

申请号：PCT/US2016/041202

申请日：2016-07-06

Applicant: QUALCOMM INCORPORATED

Inventor： WANG, Song ,  CHI, Sanghyun ,  MAHENDRAN, Arungundram Chandrasekaran ,  DAS, Soumya

IPC: H04M3/56 ,  H04W4/06 ,  H04W72/00 ,  H04W72/08

CPC classification number: H04L65/403 ,  H04B17/309 ,  H04L65/4015 ,  H04M3/568 ,  H04W4/06

Abstract: Systems and methods are described herein for providing a virtual conference with a master device connected to a plurality of satellite devices, including: receiving, by the master device, uplink data packets from a plurality of channels, each of the plurality of channels is associated with one of the plurality of satellite devices, and dividing, by the master device, the plurality of channels into two or more groups based on a conversation captured in the uplink data packets of each of the plurality of channels. The master device selects one group from the two or more groups for output. The master device also transmits downlink data packets corresponding to the selected group for the plurality of satellite devices.

Abstract translation: 本文描述了用于向连接到多个卫星设备的主设备提供虚拟会议的系统和方法，包括：由主设备从多个信道接收上行链路数据分组，多个信道中的每一个与 多个卫星设备中的一个，并且由主设备将多个信道划分为基于在多个信道中的每一个的上行链路数据分组中捕获的会话的两个或更多个组。 主设备从两个或多个组中选择一个组进行输出。 主设备还发送对应于多个卫星设备的所选择的组的下行链路数据分组。

公开(公告)号：WO2017023481A1

公开(公告)日：2017-02-09

申请号：PCT/US2016/041196

申请日：2016-07-06

Applicant: QUALCOMM INCORPORATED

Inventor： WANG, Song ,  DAS, Soumya ,  CHI, Sanghyun ,  PALADUGU, Karthika ,  SHETH, Soham Vikrambhai ,  MAHENDRAN, Arungundram Chandrasekaran

IPC: H04L12/18

CPC classification number: H04L65/403 ,  H04L12/1827 ,  H04L43/0852 ,  H04L65/4015

Abstract: Systems and methods are described herein for providing a virtual conference using a master device implemented with a personal communication device (PCD), including determining, by the master device, a latency for each of a plurality of satellite devices connected to the master device. The master device then determines an uplink buffer duration based on a difference between a highest latency and a lowest latency among the plurality of satellite devices. The master device determines a processing time for an uplink data packet, the processing time being determined based, at least in part, on the uplink buffer duration. The master device then performs signal processing at the processing time for the received uplink data packets.

Abstract translation: 这里描述了用于使用由个人通信设备（PCD）实现的主设备来提供虚拟会议的系统和方法，包括由主设备确定连接到主设备的多个卫星设备中的每一个的等待时间。 然后，主设备基于多个卫星设备中的最高等待时间和最低等待时间之间的差异来确定上行链路缓冲持续时间。 主设备确定上行链路数据分组的处理时间，处理时间至少部分地基于上行链路缓冲持续时间来确定。 然后，主设备在接收到的上行链路数据分组的处理时间执行信号处理。

公开(公告)号：WO2011113025A2

公开(公告)日：2011-09-15

申请号：PCT/US2011/028228

申请日：2011-03-11

Applicant: QUALCOMM INCORPORATED ,  WANG, Song ,  BALATSOS, Aris

Inventor： WANG, Song ,  BALATSOS, Aris

IPC: H04L7/02

CPC classification number: H04L7/0029 ,  H04L25/068

Abstract: Techniques of this disclosure provide for adjustment of a conversion rate of a sampling rate converter (SRC) in real-time. The SRC determines relative timing of generated output samples based on non-approximated integer components that are recursively updated. The SRC may further base relative timing of output samples on a value of one or more step size components associated with the integer components. Also according to techniques of this disclosure, a conversion rate of an SRC may be adjusted in real-time based on a detected mismatch between a source clock of a digital input signal and a local clock.

Abstract translation: 本公开的技术提供了实时调整采样率转换器（SRC）的转换速率。 SRC根据递归更新的非近似整数分量来确定生成的输出采样的相对时序。 SRC可以进一步基于与整数分量相关联的一个或多个步长分量的值来输出输出样本的相对时间。 同样根据本公开的技术，可以基于检测到的数字输入信号的源时钟与本地时钟之间的失配来实时地调整SRC的转换速率。

公开(公告)号：WO2009117474A3

公开(公告)日：2009-09-24

申请号：PCT/US2009/037485

申请日：2009-03-18

Applicant: QUALCOMM INCORPORATED ,  RAMAKRISHNAN, Dinesh ,  WANG, Song

Inventor： RAMAKRISHNAN, Dinesh ,  WANG, Song

IPC: H04R3/00 ,  H04R25/00

Abstract: A method for detecting wind noise is described. At least two audio signals are received. The at least two audio signals are filtered to reduce higher frequencies and to reduce lower frequencies to provide at least two filtered audio signals. The cross correlation of the at least two filtered audio signals is computed for multiple delays. A maximum cross correlation is determined from the cross correlations computed for the multiple delays. Wind noise is detected by comparing the maximum cross correlation with a threshold.

公开(公告)号：WO2009097413A1

公开(公告)日：2009-08-06

申请号：PCT/US2009/032414

申请日：2009-01-29

Applicant: QUALCOMM INCORPORATED ,  WANG, Song ,  RAMAKRISHNAN, Dinesh ,  GUPTA, Samir Kumar ,  CHOY, Eddie L.T.

Inventor： WANG, Song ,  RAMAKRISHNAN, Dinesh ,  GUPTA, Samir Kumar ,  CHOY, Eddie L.T.

IPC: H04R3/00 ,  H04R25/00 ,  G10L21/02

CPC classification number: G10L21/028 ,  G10L2021/02166 ,  H04R3/005 ,  H04R25/40

Abstract: An enhanced blind source separation technique is provided to improve separation of highly correlated signal mixtures. A beamforming algorithm is used to precondition correlated first and second input signals in order to avoid indeterminacy problems typically associated with blind source separation. The beamforming algorithm may apply spatial filters to the first signal and second signal in order to amplify signals from a first direction while attenuating signals from other directions. Such directionality may serve to amplify a desired speech signal in the first signal and attenuate the desired speech signal from the second signal. Blind source separation is then performed on the beamformer output signals to separate the desired speech signal and the ambient noise and reconstruct an estimate of the desired speech signal. To enhance the operation of the beamformer and/or blind source separation, calibration may be performed at one or more stages.

Abstract translation: 提供增强的盲源分离技术来改善高度相关的信号混合物的分离。 波束形成算法用于预处理相关的第一和第二输入信号，以避免通常与盲源分离相关联的不确定性问题。 波束成形算法可以对第一信号和第二信号应用空间滤波器，以便在衰减来自其它方向的信号的同时放大来自第一方向的信号。 这种方向性可以用于在第一信号中放大期望的语音信号，并从第二信号中衰减所需的语音信号。 然后对波束形成器输出信号执行盲源分离，以分离所需的语音信号和环境噪声，并重构所需语音信号的估计。 为了增强波束形成器和/或盲源分离的操作，可以在一个或多个阶段执行校准。

公开(公告)号：WO2007146599A3

公开(公告)日：2007-12-21

申请号：PCT/US2007/070038

申请日：2007-05-31

Applicant: QUALCOMM INCORPORATED ,  WANG, Song ,  CHOY, Eddie, L., T. ,  GUPTA, Samir, Kumar

Inventor： WANG, Song ,  CHOY, Eddie, L., T. ,  GUPTA, Samir, Kumar

IPC: H03H17/06

Abstract: In general, this disclosure describes techniques for changing a sampling frequency of a digital signal. In particular, the techniques provide a more accurate way to determining a relative timing between a desired output sample and a corresponding input sample using a non-approximated integer representation of the relative timing. The relative timing between the desired output sample and corresponding input sample may be represented using a first component that identifies a latest input sample of the digital signal used to generate intermediate samples, a second component that identifies an intermediate sample, and a third component that identifies a timing difference between the desired output sample and the intermediate sample. Each of the components may be recursively updated using non-approximated integer values.