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    Echo canceller with talk state determination to control speech processor functional elements in a digital telephone system
    1.
    发明授权
    Echo canceller with talk state determination to control speech processor functional elements in a digital telephone system 失效
    具有通话状态确定的回波消除器来控制数字电话系统中的语音处理器功能元件

    公开(公告)号：US5920834A

    公开(公告)日：1999-07-06

    申请号：US834397

    申请日：1997-01-31

    申请人： Gilbert C. Sih ,  Anthony P. Mauro

    发明人： Gilbert C. Sih ,  Anthony P. Mauro

    IPC分类号： H04M1/60 ,  H04B3/20 ,  H04B3/23 ,  G10L3/02

    CPC分类号： H04B3/23

    摘要： A method and apparatus for controlling various functional elements in a digital telephone system using state determination from an echo canceller. An echo canceller is used to evaluate which one of five talk states two speakers are engaged in during a telephone conversation. This state determination information is used to control a tone detector function, a noise suppressor function, an adaptive equalizer function, a transmission mute function, and a vocoder encoder function within a vocoder. During the talk state where the far-end speaker is active and the near-end speaker is inactive, the echo canceller provides a signal which disables background noise estimates from being performed in the noise suppressor and the vocoder encoder. The same signal is used to disable the tone detector and to enable the transmission mute function during this talk state.

    摘要翻译： 一种使用来自回波消除器的状态确定来控制数字电话系统中的各种功能元件的方法和装置。 回声消除器用于评估在电话交谈期间两个扬声器参与的五个通话状态中的哪一个。 该状态确定信息用于控制声码器内的音调检测器功能，噪声抑制器功能，自适应均衡器功能，传输静音功能和声码器编码器功能。 在远端扬声器有效并且近端扬声器无效的通话状态期间，回声消除器提供禁止在噪声抑制器和声码器编码器中执行背景噪声估计的信号。 相同的信号用于禁用音调检测器，并在此通话状态期间启用传输静音功能。

    Low frequency spectral enhancement system and method
    2.
    发明授权
    Low frequency spectral enhancement system and method 失效
    低频谱增强系统和方法

    公开(公告)号：US06233549B1

    公开(公告)日：2001-05-15

    申请号：US09199072

    申请日：1998-11-23

    申请人： Anthony P. Mauro ,  Gilbert C. Sih

    发明人： Anthony P. Mauro ,  Gilbert C. Sih

    IPC分类号： G10L1906

    CPC分类号： G10L21/02 ,  G10L21/0232

    摘要： A system for enhancing low frequency spectral content of a digitized signal which identifies a fundamental frequency component in the signal and selectively boosts signals within a predetermined range thereof. In the illustrative embodiment, the digitized signal is a frequency domain transformed speech signal. The invention amplifies the low frequency components of the speech signal. The speaker unique fundamental frequency of the speech is computed using pitch delay information and is thus dynamic from frame to frame and also speaker to speaker. This fundamental frequency defines the center point of a gain window which is applied to select frequency components. Only such fundamental frequency components which exhibit a large enough signal to noise ratio have the amplification function applied. Thus, this function can be applied directly following a noise suppression system which has knowledge of the signal quality in each frequency bin. The gain window is ramped up and hanged over to smooth the amplification function between successive frames.

    摘要翻译： 一种用于增强数字化信号的低频谱含量的系统，其识别信号中的基频分量并且选择性地提高其预定范围内的信号。 在说明性实施例中，数字化信号是频域变换的语音信号。 本发明放大语音信号的低频分量。 使用音调延迟信息来计算扬声器独特的基本频率，并且因此是帧间动态的，而扬声器也是扬声器。 该基本频率定义了应用于选择频率分量的增益窗口的中心点。 仅具有足够大的信噪比的基频分量具有应用的放大功能。 因此，该功能可以直接应用于具有每个频率仓中的信号质量知识的噪声抑制系统。 增益窗口上升并挂起，以平滑连续帧之间的放大功能。

    System and method for enhancing low frequency spectrum content of a digitized voice signal
    3.
    发明授权
    System and method for enhancing low frequency spectrum content of a digitized voice signal 失效
    用于增强数字化语音信号的低频谱内容的系统和方法

    公开(公告)号：US06694291B2

    公开(公告)日：2004-02-17

    申请号：US09745244

    申请日：2000-12-20

    申请人： Anthony P. Mauro ,  Gilbert C. Sih

    发明人： Anthony P. Mauro ,  Gilbert C. Sih

    IPC分类号： G10L1906

    CPC分类号： G10L21/02 ,  G10L21/0232

    摘要： A system for enhancing low frequency spectral content of a signal transmitted via a channel, that includes a noise suppression circuit to update channel energy estimates; and a spectral enhancer circuit coupled to and follows the noise suppression circuit, the spectral enhancer circuit to determine channel enhancement in response to the channel energy estimates.

    摘要翻译： 一种用于增强经由信道发送的信号的低频谱含量的系统，其包括用于更新信道能量估计的噪声抑制电路; 以及耦合到噪声抑制电路并且跟随噪声抑制电路的频谱增强器电路，频谱增强器电路响应于信道能量估计来确定信道增强。

    Data boundary aware base station assisted position location
    4.
    发明授权
    Data boundary aware base station assisted position location 有权
    数据边界感知基站辅助位置定位

    公开(公告)号：US07457630B2

    公开(公告)日：2008-11-25

    申请号：US09956325

    申请日：2001-09-18

    申请人： Qiuzhen Zou ,  Gilbert C. Sih ,  Inyup Kang

    发明人： Qiuzhen Zou ,  Gilbert C. Sih ,  Inyup Kang

    IPC分类号： H04Q7/20

    CPC分类号： G01S5/0036 ,  G01S19/235 ,  G01S19/254 ,  G01S19/258 ,  G01S19/30

    摘要： The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment of the invention comprises a method for performing position location on a subscriber unit in a terrestrial wireless telephone system using a set of satellites each transmitting a signal, the terrestrial wireless telephone system having base stations, including the steps of transmitting an aiding message from the base station to the subscriber unit, said aiding message containing information regarding a data boundary for each signal from the set of satellites, applying correlation codes to each signal yielding corresponding correlation data and accumulating said correlation data over an first interval preceding a corresponding data boundary yielding a first accumulation result, and a second interval following said corresponding data boundary yielding a second accumulation result.

    摘要翻译： 本发明是一种用于在无线通信系统中执行位置定位的新颖且改进的方法和装置。 本发明的一个实施例包括一种用于在陆地无线电话系统中的用户单元上执行位置定位的方法，该方法使用一组发射信号的卫星，具有基站的地面无线电话系统包括以下步骤：从 基站到用户单元，所述辅助消息包含关于来自卫星组的每个信号的数据边界的信息，将相关代码应用于产生相应相关数据的每个信号，并在对应的数据边界之前的第一间隔上累加所述相关数据 产生第一累积结果，并且在所述对应数据边界之后的第二间隔产生第二累积结果。

    Position location with low tolerance oscillator
    5.
    发明授权
    Position location with low tolerance oscillator 有权

    公开(公告)号：US06208292B1

    公开(公告)日：2001-03-27

    申请号：US09150093

    申请日：1998-09-09

    申请人： Gilbert C. Sih ,  Qiuzhen Zou

    发明人： Gilbert C. Sih ,  Qiuzhen Zou

    IPC分类号： H04B726

    CPC分类号： G01S19/235 ,  G01S19/246 ,  G01S2205/008

    摘要： The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment of the invention comprises a method of performing position location in a wireless subscriber unit having a local oscillator, including the steps of receiving a position location request, acquiring a timing signal when a sufficient period of time has elapsed since the local oscillator has been corrected and correcting said local oscillator using a correction signal based on said timing signal, substantially freezing the correction signal, performing a position location procedure using the local oscillator with the correction signal applied, and ending said position location procedure.

    Reliable position location in memory limited environment
    6.
    发明授权
    Reliable position location in memory limited environment 有权
    可靠的位置在记忆体有限的环境中

    公开(公告)号：US06195041B1

    公开(公告)日：2001-02-27

    申请号：US09150409

    申请日：1998-09-09

    申请人： William Gardner ,  Avneesh Agrawal ,  Gilbert C. Sih ,  Qiuzhen Zou ,  Inyup Kang

    发明人： William Gardner ,  Avneesh Agrawal ,  Gilbert C. Sih ,  Qiuzhen Zou ,  Inyup Kang

    IPC分类号： G01S502

    CPC分类号： G01S19/235 ,  G01S5/0036 ,  G01S5/0063 ,  G01S19/246 ,  G01S19/254 ,  G01S19/256 ,  G01S19/29 ,  G01S2205/008

    摘要： The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment comprises a method for performing position location in a wireless communication system using a set of signals transmitted from a set of satellites including the steps of receiving signal samples, rotating an acquisition code by a first rotation amount yielding a rotated acquisition code, despreading said signal samples using rotated acquisition code yielding despread data, accumulating said despread data over a first duration yielding partially accumulated data, rotating said partially accumulated data by a second rotation amount yielding rotated data and accumulating said rotated data.

    摘要翻译： 本发明是一种用于在无线通信系统中执行位置定位的新颖且改进的方法和装置。 一个实施例包括一种用于在使用从一组卫星发送的一组信号的无线通信系统中执行位置定位的方法，包括以下步骤：接收信号样本，使采集码旋转第一旋转量产生旋转采集码，解扩所述 使用旋转获取码的信号样本产生解扩数据，在第一持续时间内积累所述解扩数据产生部分累积的数据，将所述部分累积的数据旋转第二旋转量，产生旋转数据并累加所述旋转的数据。

    Doubletalk detection by means of spectral content
    7.
    发明授权
    Doubletalk detection by means of spectral content 失效
    通过光谱内容进行双曲线检测

    公开(公告)号：US5732134A

    公开(公告)日：1998-03-24

    申请号：US783768

    申请日：1997-01-15

    申请人： Gilbert C. Sih

    发明人： Gilbert C. Sih

    IPC分类号： H04B3/23 ,  H04M9/08 ,  H04M1/20

    CPC分类号： H04M9/082 ,  H04B3/234

    摘要： A method and apparatus are described for detecting doubletalk in an acoustic echo canceller. The present invention examines the spectral characteristic of the near-end audio signal and the spectral characteristics of the far-end audio signal and determines from the comparison if a condition of doubletalk exists. An exemplary implementaion of the present invention is presented in an acoustic echo canceller wherein the adaptation of the adaptive filter taps is inhibited during periods of doubletalk.

    摘要翻译： 描述了一种用于在声学回声消除器中检测doubletalk的方法和装置。 本发明检查近端音频信号的频谱特性和远端音频信号的频谱特性，并从比较确定是否存在doubletalk的条件。 本发明的示例性实施方式在声学回声消除器中呈现，其中自适应滤波器抽头的适应在双脉冲周期期间被禁止。

    Variable block size adaptation algorithm for noise-robust acoustic echo cancellation
    8.
    发明授权
    Variable block size adaptation algorithm for noise-robust acoustic echo cancellation 失效
    用于噪声鲁棒声学回声消除的可变块大小自适应算法

    公开(公告)号：US5546459A

    公开(公告)日：1996-08-13

    申请号：US146644

    申请日：1993-11-01

    申请人： Gilbert C. Sih ,  Franklin P. Antonio

    发明人： Gilbert C. Sih ,  Franklin P. Antonio

    IPC分类号： H03H21/00 ,  H04B3/23 ,  H04M9/08

    CPC分类号： H04B3/23 ,  H03H21/0012

    摘要： An apparatus that automatically adjusts the adaptation block size for a least-mean square (LMS) adaptive filter depending on the input signal-to-noise ratio (SNR) is disclosed. The apparatus monitors the instantaneous SNR and continually adjusts the block size to provide high noise immunity, thereby increasing the convergence speed of the filter and decreasing the asymptotic mean-square error. An exemplary embodiment of the present invention is presented in the context of acoustic echo cancellation, though it is noted that the adaptive filter of the present invention is useful in any environment in which the noise characteristics are subject to change.

    摘要翻译： 公开了一种根据输入信噪比（SNR）自动调整最小均方（LMS）自适应滤波器的自适应块大小的装置。 该装置监视瞬时信噪比，并持续调整块大小，提供高噪声抗扰度，从而提高滤波器的收敛速度，并减小渐近均方误差。 尽管要注意的是本发明的自适应滤波器在噪声特性可能改变的任何环境中都是有用的，但本发明的示例性实施例在声学回声消除的上下文中呈现。