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    VOICE SWITCHING FOR VOICE COMMUNICATION ON COMPUTERS
    32.
    发明申请
    VOICE SWITCHING FOR VOICE COMMUNICATION ON COMPUTERS 有权
    电脑语音通话语音切换

    公开(公告)号：US20090207763A1

    公开(公告)日：2009-08-20

    申请号：US12032589

    申请日：2008-02-15

    申请人： Qin Li ,  Chao He

    发明人： Qin Li ,  Chao He

    IPC分类号： H04B3/20

    CPC分类号： H04M9/082

    摘要： A voice communication end device performs quality checks to determine whether acoustic echo cancellation would be ineffective, such as due to noise or clock drift or discontinuities between incoming and outgoing voice channels. In the case where echo cancellation would prove ineffective, the device falls back on a tri-state voice switching operation that includes a bi-direction state in which both channels are on in full duplex operation, which provides a smoother transition switching between active channels. The tri-state voice switching supports both voluntary transitions where the active user voluntarily stops to yield the active channel, and forced transitions where the active user is forcedly interrupted by the other user speaking more loudly.

    摘要翻译： 语音通信终端设备执行质量检查以确定声学回声消除是否无效，例如由于噪声或时钟漂移或入站和出局语音信道之间的不连续性。 在回声消除无效的情况下，设备退回到三态语音切换操作，该三态语音切换操作包括双向状态，其中两个信道都是全双工操作，这在主动信道之间提供更平滑的转换切换。 三态语音切换支持主动用户自愿停止以产生活动信道的自愿转换，以及强制转换，其中主动用户被其他用户强烈地更大声地中断。

    Method and apparatus for reducing timestamp noise in audio echo cancellation
    33.
    发明申请
    Method and apparatus for reducing timestamp noise in audio echo cancellation 有权
    用于减少音频回声消除中的时间戳噪声的方法和装置

    公开(公告)号：US20080259828A1

    公开(公告)日：2008-10-23

    申请号：US11788939

    申请日：2007-04-23

    申请人： Chao He ,  Qin Li ,  Wei-ge Chen

    发明人： Chao He ,  Qin Li ,  Wei-ge Chen

    IPC分类号： H04B15/00

    CPC分类号： H04M9/082

    摘要： A communication end device of a two-way communication system is shown. The device includes an audio signal capture device for capturing local audio to be transmitted to another end device, an audio signal rendering device for playing remote audio received from the other end device, and buffers for buffering the captured and rendered audio signals. The device also includes an audio echo canceller operating to predict echo from the rendered audio signal at a calculated relative offset in the captured audio signal based on an adaptive filter, and subtract the predicted echo from the signal transmitted to the other end device The calculated relative offset that is used by the audio echo canceller for a current signal sample is adjusted if a difference between it and an adjusted relative offset of a preceding sample exceeds a threshold value.

    摘要翻译： 示出了双向通信系统的通信终端设备。 该装置包括用于捕获要发送到另一终端设备的本地音频的音频信号捕获设备，用于播放从另一端设备接收的远程音频的音频信号渲染设备，以及用于缓冲所捕获和渲染的音频信号的缓冲器。 该装置还包括音频回波消除器，其操作以基于自适应滤波器在所捕获的音频信号中以计算的相对偏移来预测来自渲染音频信号的回波，并且从发送到另一端装置的信号中减去预测回波。计算的相对 当音频回波消除器用于当前信号样本的偏移量如果其与先前样本的经调整的相对偏移之间的差异超过阈值则被调整。

    Filter bank optimization for acoustic echo cancellation
    34.
    发明申请
    Filter bank optimization for acoustic echo cancellation 有权
    用于声学回声消除的滤波器组优化

    公开(公告)号：US20080253553A1

    公开(公告)日：2008-10-16

    申请号：US11784893

    申请日：2007-04-10

    申请人： Qin Li ,  Wei-ge Chen ,  Chao He

    发明人： Qin Li ,  Wei-ge Chen ,  Chao He

    IPC分类号： H04M9/08

    CPC分类号： H04M9/082

    摘要： A communications device is presented for providing bi-directional audio communications between a near-end user and a far-end user via a bidirectional communications channel. The communications device includes an adaptive echo canceller receiving a near-end audio signal and a far-end audio signal and providing an echo-canceled near-end audio signal for transmission to the far-end user via the communications channel. The adaptive echo canceller includes a first bank of analysis filters for filtering the near-end audio signal, a second bank of analysis filters for filtering the far-end audio signal, and a bank of synthesis filters for filtering sub-band echo-canceled signals generated within the adaptive echo canceller. The first and second filter banks have a frequency response optimized to reduce echo residual gain.

    摘要翻译： 呈现通信设备，用于经由双向通信信道在近端用户和远端用户之间提供双向音频通信。 通信设备包括接收近端音频信号和远端音频信号的自适应回波消除器，并提供回波消除的近端音频信号，以经由通信信道传输给远端用户。 自适应回波消除器包括用于滤波近端音频信号的第一组分析滤波器，用于滤波远端音频信号的第二组分析滤波器，以及用于滤波子带回波消除信号的一组合成滤波器 在自适应回波消除器内产生。 第一和第二滤波器组具有优化的频率响应以减少回波残余增益。

    Double-Talk Detection for Audio Communication
    37.
    发明申请
    Double-Talk Detection for Audio Communication 审中-公开
    音频通信的双向通话检测

    公开(公告)号：US20130332155A1

    公开(公告)日：2013-12-12

    申请号：US13490063

    申请日：2012-06-06

    申请人： Vinod Prakash ,  Xiaoqin Sun ,  Warren Lam ,  Qin Li

    发明人： Vinod Prakash ,  Xiaoqin Sun ,  Warren Lam ,  Qin Li

    IPC分类号： G10L21/02 ,  G10L21/00

    CPC分类号： H04M9/082

    摘要： The detection of double-talk in audio communication is provided. A communication device may receive an echo signal mixed with a speech signal at a near end location. The echo signal may be generated by speech transmitted by a remote party at a far end location to a local party at the near end location. The speech signal may be received from the local party for transmission to the remote party. The communication device may then filter the echo signal and the speech signal. The communication device may then analyze the speech signal to identify speech characteristics which indicate the presence of double-talk. The communication device may then set a flag upon identifying the speech characteristics which indicate the presence of the double-talk. The communication device may then process the filtered signals to further suppress remaining echo prior to transmission of the speech signal to the remote party.

    摘要翻译： 提供了音频通信中的双向通话检测。 通信设备可以在近端位置处接收与语音信号混合的回波信号。 回波信号可以由在远端位置的远程方发送的语音产生，在近端位置处的本地方。 可以从本地方接收语音信号以便传送到远程方。 然后，通信设备可以对回波信号和语音信号进行滤波。 然后，通信设备可以分析语音信号以识别表示双方的存在的语音特征。 然后，通信设备可以在识别指示双方通话的存在的语音特征时设置标志。 然后，通信设备可以处理经滤波的信号，以在将语音信号发送到远程方之前进一步抑制剩余回声。

    Voice switching for voice communication on computers
    39.
    发明授权
    Voice switching for voice communication on computers 有权

    公开(公告)号：US08380253B2

    公开(公告)日：2013-02-19

    申请号：US12032589

    申请日：2008-02-15

    申请人： Qin Li ,  Chao He

    发明人： Qin Li ,  Chao He

    IPC分类号： H04B3/20

    CPC分类号： H04M9/082

    摘要： A voice communication end device performs quality checks to determine whether acoustic echo cancellation would be ineffective, such as due to noise or clock drift or discontinuities between incoming and outgoing voice channels. In the case where echo cancellation would prove ineffective, the device falls back on a tri-state voice switching operation that includes a bi-direction state in which both channels are on in full duplex operation, which provides a smoother transition switching between active channels. The tri-state voice switching supports both voluntary transitions where the active user voluntarily stops to yield the active channel, and forced transitions where the active user is forcedly interrupted by the other user speaking more loudly.

    APPARATUS AND METHOD FOR NON-INVASIVE DIABETIC RETINOPATHY DETECTION AND MONITORING
    40.
    发明申请
    APPARATUS AND METHOD FOR NON-INVASIVE DIABETIC RETINOPATHY DETECTION AND MONITORING 有权
    非侵入性糖尿病性肾上腺皮质激素检测与监测装置及方法

    公开(公告)号：US20120249959A1

    公开(公告)日：2012-10-04

    申请号：US13436991

    申请日：2012-04-01

    申请人： Jia You ,  Qin Li ,  Zhenhua Guo ,  Qiang Sun ,  Chun Li

    发明人： Jia You ,  Qin Li ,  Zhenhua Guo ,  Qiang Sun ,  Chun Li

    IPC分类号： A61B3/12

    CPC分类号： A61B3/12 ,  G06K9/00597 ,  G06K9/0061 ,  G06K9/36 ,  G06K9/46 ,  G06K9/4609 ,  G06K9/4652

    摘要： A fundus camera using infrared light sources, which included an imaging optical path and an optical path for focusing and positioning and two optical paths share a common set of retina objective lens, and a computer-assisted method for retinal vessel segmentation in general and diabetic retinopathy (DR) image segmentation in particular. The method is primarily based on Multiscale Production of the Matched Filter (MPMF) scheme, which together the fundus camera, is useful for non-invasive diabetic retinopathy detection and monitoring.

    摘要翻译： 使用红外光源的眼底照相机，其包括成像光路和用于聚焦和定位的光路，以及两个光路共享一组共同的视网膜物镜，以及用于视网膜血管分割的计算机辅助方法和糖尿病性视网膜病变 （DR）图像分割。 该方法主要基于多尺度生产匹配滤波器（MPMF）方案，该方案一起使用眼底照相机，可用于非侵入性糖尿病视网膜病变检测和监测。