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    SYSTEM AND METHOD FOR AVOIDING FALSE CONVERGENCE DUE TO PRESENCE OF TONES IN TIME-DOMAIN ECHO CANCELLATION PROCESSING
    1.
    发明专利
    SYSTEM AND METHOD FOR AVOIDING FALSE CONVERGENCE DUE TO PRESENCE OF TONES IN TIME-DOMAIN ECHO CANCELLATION PROCESSING 审中-公开

    公开(公告)号：JP2002335195A

    公开(公告)日：2002-11-22

    申请号：JP2002115025

    申请日：2002-04-17

    Applicant: QUALCOMM INC

    Inventor： GILBERT C SIH

    IPC: H03H21/00 ,  H04B3/23 ,  H04M1/00 ,  H04Q3/42

    Abstract: PROBLEM TO BE SOLVED: To provide a system and a method for avoiding false convergence due to the presence of a tone, in time-domain echo cancellation. SOLUTION: The system for avoiding false convergence in an echo canceler, having an adaptive step size controlled for converge a set of filter tap values and an adaptive filter for estimating the channel response over the entire operating frequency range comprises a means for determining the content of spectrum of a set of filter tap values, and means for controlling the adaptive step size of the adaptive filter, depending on the content of spectrum of a set of filter tap values. The means for controlling the adaptive step size comprises a means for decreasing the adaptive step size, when the content of spectrum indicates a state possibly causing false convergence, and means for increasing the adaptive step size subsequent to decrease thereof.

    NETWORK ECHO CANCELATION SYSTEM AND ECHO CANCELATION METHOD
    2.
    发明专利
    NETWORK ECHO CANCELATION SYSTEM AND ECHO CANCELATION METHOD 失效

    公开(公告)号：JP2002033683A

    公开(公告)日：2002-01-31

    申请号：JP2001170009

    申请日：2001-06-05

    Applicant: QUALCOMM INC

    Inventor： GILBERT C SIH

    IPC: H04M1/60 ,  G10L19/012 ,  H04B3/23 ,  H04M9/08

    Abstract: PROBLEM TO BE SOLVED: To provide an echo cancelation system and an echo cancelation method by which a nonlinear effect by an unknown echo channel can be avoided. SOLUTION: The echo cancelation system is characteristically provided with an automatic gain controller 188 that receives a far-end signal x(n) from a far-end channel, adjusts the far-end signal according to a gain control signal and provides a controlled dynamic range signal and with an echo cancelation means 180 that is connected to the automatic gain controller 188, receives the controlled dynamic range signal from the automatic gain controller 188, receives a coupling signal consisting of the echo reception channel signal and an input return path channel signal from a return path channel, subtracts the echo reception channel signal from the return path channel and gives the automatic gain control signal to the automatic gain controller 188.

    Apparatus and method for calibrating frequency of local oscillator in wireless communications
    3.
    发明专利
    Apparatus and method for calibrating frequency of local oscillator in wireless communications 有权
    无线通信中本地振荡器频率校准的装置及方法

    公开(公告)号：JP2009246998A

    公开(公告)日：2009-10-22

    申请号：JP2009143915

    申请日：2009-06-17

    Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

    Inventor： GILBERT C SIH ,  CHALLA RAGHU

    IPC: H04L27/38 ,  H03B1/00 ,  H04B1/16 ,  H04L27/00

    CPC classification number: H04L27/0014 ,  H04L2027/0016 ,  H04L2027/0057 ,  H04L2027/0087

    Abstract: PROBLEM TO BE SOLVED: To provide an apparatus and a method for calibrating the frequency of a local oscillator in wireless communications.
    SOLUTION: According to a disclosed embodiment, a receiver comprising a digital rotator in combination with a frequency error discriminator in a digital automatic frequency control loop is used to obtain accurate digital values used to calibrate a local oscillation frequency. A frequency error in the oscillation frequency of a local frequency generation loop causes a change in the frequency of a baseband input signal. The change in the baseband input signal frequency related to the frequency error in the local frequency generation loop can be detected as a phase rotation by the frequency error discriminator. By using the digital automatic frequency control loop, the frequency error introduced by local frequency generation is determined with accuracy. The frequency error and corresponding control bits are entered into a calibration table. The calibration table may be used to adjust the local oscillation frequency for temperature changes, pilot searching, and quick paging.
    COPYRIGHT: (C)2010,JPO&INPIT

    Abstract translation: 要解决的问题：提供一种用于在无线通信中校准本地振荡器的频率的装置和方法。 解决方案：根据所公开的实施例，使用包括与数字自动频率控制环路中的频率误差鉴别器结合的数字旋转器的接收器来获得用于校准本地振荡频率的精确数字值。 本地频率发生环路的振荡频率的频率误差导致基带输入信号的频率变化。 与本地频率产生回路中的频率误差相关的基带输入信号频率的变化可以被频率误差鉴别器检测为相位旋转。 通过使用数字自动频率控制环路，准确地确定本地频率发生引入的频率误差。 将频率误差和相应的控制位输入校准表。 校准表可用于调整温度变化，导频搜索和快速寻呼的本地振荡频率。 版权所有（C）2010，JPO＆INPIT

    Method and apparatus for detecting facsimile transmission
    4.
    发明专利
    Method and apparatus for detecting facsimile transmission 审中-公开
    用于检测FACSIMILE传输的方法和装置

    公开(公告)号：JP2009135924A

    公开(公告)日：2009-06-18

    申请号：JP2008299843

    申请日：2008-11-25

    Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

    Inventor： GILBERT C SIH ,  JOHN JOHNNY K

    IPC: H04N1/32 ,  H04M1/725 ,  H04M11/00 ,  H04N1/327

    CPC classification number: H04N1/32708 ,  H04M1/725 ,  H04N1/32704 ,  H04N1/32715 ,  H04N1/32721

    Abstract: PROBLEM TO BE SOLVED: To provide a method and an apparatus for detecting facsimile transmission.
    SOLUTION: A novel and improved method and an apparatus for providing an interface to a digital wireless telephone system compatible with standard analog wire line telephones and analog wire line facsimile machines are disclosed. During a telephone call, a facsimile detector 11 monitors incoming data for facsmile signals. If facsmile transmission is detected, a data processor 12 switches processing from data processing as if it were a voice to processing it as facsimile transmission. In addition, the remote station is sent a signal notifying it to process the data as facsimile transmission rather than the voice. The facsimile detector 11 is operated by detecting the preamble of a V.21 message present at the beginning of each facsimile call. Energy is measured in both frequencies of the BFSK signals. A decision is made by analyzing the energy and locating a specific pattern which is repeated itself a sufficient number of times.
    COPYRIGHT: (C)2009,JPO&INPIT

    Abstract translation: 要解决的问题：提供一种用于检测传真传输的方法和装置。 公开了一种用于向与标准模拟有线电话和模拟有线线路传真机兼容的数字无线电话系统提供接口的新型改进的方法和装置。 在电话呼叫期间，传真机检测器11监视输入数据以获取信号。 如果检测到透明传输，则数据处理器12将处理从数据处理切换成像语音一样处理它作为传真传输。 另外，远程站被发送一个通知它的信号来处理数据作为传真传输而不是声音。 通过检测在每个传真呼叫开始时存在的V.21消息的前导码来操作传真机检测器11。 在BFSK信号的两个频率上测量能量。 通过分析能量和定位特定模式进行决定，该模式本身重复了足够的次数。 版权所有（C）2009，JPO＆INPIT

    System and method for avoiding false convergence caused by presence of tones in time-domain echo cancellation process
    5.
    发明专利
    System and method for avoiding false convergence caused by presence of tones in time-domain echo cancellation process 有权
    系统和方法，用于避免在时域退出过程中存在的债权导致的虚假收敛

    公开(公告)号：JP2005110307A

    公开(公告)日：2005-04-21

    申请号：JP2004346637

    申请日：2004-11-30

    Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

    Inventor： GILBERT C SIH

    IPC: H03H21/00 ,  H04B3/23 ,  H04M1/00 ,  H04Q3/42

    CPC classification number: H04B3/23

    Abstract: PROBLEM TO BE SOLVED: To provide a system and method for avoiding a false convergence caused by a presence of tones in a time-domain echo cancellation process. SOLUTION: The system avoids the false convergence in an echo canceller, having an adaptation step size controlled to allow a set of filter tap values to converge and having an adaptive filter to estimate a channel response over a whole operation frequency range. The system comprises a means for determining a spectral content of the set of filter tap values and a means for controlling the adaptation step size of the adaptive filter in response to the spectral content of the set of filter tap values. A means for controlling the adaptation step size comprises a means for reducing the adaptation step size if the spectral content indicates a condition which may cause the false convergence and a means for increasing the adaptation step size subsequent to reduce the adaptation step size. COPYRIGHT: (C)2005,JPO&NCIPI

    Abstract translation: 要解决的问题：提供一种用于避免在时域回声消除过程中由于存在音调而导致的虚假收敛的系统和方法。 解决方案：系统避免回波消除器中的错收敛，其具有受控的适配步长以允许一组滤波器抽头值收敛并具有自适应滤波器以估计整个操作频率范围内的信道响应。 该系统包括用于确定滤波器抽头值集合的频谱内容的装置和用于响应于滤波器抽头值集合的频谱内容来控制自适应滤波器的自适应步长的装置。 用于控制自适应步长的装置包括用于在频谱内容指示可能导致假收敛的条件的情况下减小自适应步长的装置，以及在减小适应步长后增加自适应步长的装置。 版权所有（C）2005，JPO＆NCIPI

    LOCALIZACION DE POSICION CON OSCILADOR DE BAJA TOLERANCIA.
    10.
    发明专利
    LOCALIZACION DE POSICION CON OSCILADOR DE BAJA TOLERANCIA. 未知

    公开(公告)号：MXPA03006902A

    公开(公告)日：2004-04-02

    申请号：MXPA03006902

    申请日：2002-01-31

    Applicant: QUALCOMM INC

    Inventor： GILBERT C SIH

    IPC: G01S1/00 ,  G01S1/26 ,  G01S19/01 ,  G01S19/48 ,  H04W4/02 ,  G01S5/14

    Abstract: La presente invencion es un metodo y aparato mejorado y novedoso para realizar una localizacion de posicion en un sistema de comunicaciones inalambricas. Una modalidad de la presente invencion comprende un metodo para realizar una localizacion de posicion en una unidad inalambrica suscrita que tiene un oscilador local, incluyendo los pasos de recibir una solicitud de localizacion de posicion, adquirir una senal de temporizacion cuando ha transcurrido un periodo de tiempo suficiente desde que el oscilador local ha sido corregido, y corregido el oscilador local utilizando una senal de correccion con base en la senal de temporizacion, congelando en forma substancial la senal de correccion, realizando un procedimiento de localizacion de posicion utilizando el oscilador local con la senal de el correccion aplicada, y finalizando procedimiento de localizacion de posicion.

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