Audio processing system for teleconferencing system
    1.
    发明授权
    Audio processing system for teleconferencing system 失效
    用于电话会议系统的音频处理系统

    公开(公告)号:US5271057A

    公开(公告)日:1993-12-14

    申请号:US774085

    申请日:1991-10-09

    CPC分类号: H04M9/087

    摘要: An audio processing system (100) for use in a teleconferencing system (10) utilizes complementary comb filters (42, 52, 220, 320) in combination with an echo suppressor (210, 310) and/or a frequency scaler (60, 120) to substantially improve acoustic stability margin and reduce far-end talker echo.

    摘要翻译: 用于电话会议系统(10)的音频处理系统(100)利用与回波抑制器(210,310)和/或频率缩放器(60,120)组合的互补梳状滤波器(42,42,220,320) ),以显着提高声学稳定性裕度,并减少远端讲话者的回声。

    Audio processing system for teleconferencing with high and low
transmission delays
    2.
    发明授权
    Audio processing system for teleconferencing with high and low transmission delays 失效
    用于具有高和低传输延迟的电话会议的音频处理系统

    公开(公告)号:US5386465A

    公开(公告)日:1995-01-31

    申请号:US8965

    申请日:1993-01-26

    IPC分类号: H04M1/60 H04M9/08 H04N7/15

    CPC分类号: H04M9/087

    摘要: An audio processing system for use in teleconferencing systems having high and low transmission delays. The audio processing system utilizes complementary comb filters in combination with auxiliary echo suppressors, a frequency scaler, expander/gates and automatic level controlling devices to substantially improve acoustic stability margin and reduce far-end talker echo.

    摘要翻译: 一种用于具有高和低传输延迟的电话会议系统中的音频处理系统。 音频处理系统利用互补梳状滤波器与辅助回波抑制器,频率缩放器,扩展器/门和自动电平控制装置相结合,以显着提高声稳定裕度并减少远端讲话者回波。

    Video teleconferencing system employing aspect ratio transformation
    3.
    发明授权
    Video teleconferencing system employing aspect ratio transformation 失效
    视频电话会议系统采用纵横比变换

    公开(公告)号:US5280540A

    公开(公告)日:1994-01-18

    申请号:US774182

    申请日:1991-10-09

    IPC分类号: H04N7/15 H04N1/42

    CPC分类号: H04N7/15

    摘要: A teleconferencing system (100, 100') provides a wide aspect ratio view at each site utilizing a single NTSC camera (250, 350) and projector (260,360). At the transmitting end of a teleconference, a transformation element (280, 380, 510, 610) maps a wide aspect ratio field of view into the field of view of an NTSC camera. The transformation is reversed at the receiving end of the teleconferencing system.

    摘要翻译: 电视会议系统(100,100')利用单个NTSC照相机(250,350)和投影仪(260,360)在每个位置处提供宽的宽高比视图。 在电话会议的发送端,变换元件(280,380,510,610)将宽的宽高比视野映射到NTSC照相机的视场。 在电话会议系统的接收端进行转换。

    Sound localization system for teleconferencing using self-steering
microphone arrays
    4.
    发明授权
    Sound localization system for teleconferencing using self-steering microphone arrays 失效
    使用自动转向麦克风阵列的电话会议的声音定位系统

    公开(公告)号:US5335011A

    公开(公告)日:1994-08-02

    申请号:US3380

    申请日:1993-01-12

    摘要: A teleconferencing system 100 is disclosed having a video camera for generating a video signal representative of a video image of a first station B. A microphone array 150, 160 is also provided in the first station for receiving a sound from one or more fixed non-overlapping volume zones 151, 152, 153, 154, 155, 156, 157, 158, 159, into which the first station is divided. The microphone array is also provided for generating a monochannel audio signal 170 representative of the received sound and a direction signal indicating, based on the sound received from each zone, from which of the volume zones the sound originated. The teleconferencing system also includes a display device 120A at a second station A for displaying a video image of the first station. A loudspeaker control device 140 is also provided at the second station for selecting a virtual location 121 on the displayed video image depending on the direction signal, and for generating stereo sound from the monochannel audio signal which stereo sound emanates from the virtual location on the displayed video image.

    摘要翻译: 公开了一种电视会议系统100,其具有用于产生代表第一电台B的视频图像的视频信号的摄像机。还在第一电台中设置麦克风阵列150,160,用于从一个或多个固定无线电设备接收声音, 重叠体积区域151,152,153,154,155,156,157,158,159,其中第一站被划分到其中。 麦克风阵列还被提供用于产生表示接收到的声音的单声道音频信号170,以及一个方向信号,该方向信号基于从每个区域接收到的声音,从音源中的哪一个区域起始。 电话会议系统还包括在第二站A处的显示设备120A,用于显示第一站的视频图像。 扬声器控制装置140还设置在第二站处,用于根据方向信号选择显示的视频图像上的虚拟位置121,并且用于从显示的虚拟位置产生的立体声从单声道音频信号产生立体声 视频图像。

    Method for improving the reliability of data transmission over Rayleigh
fading channels
    5.
    发明授权
    Method for improving the reliability of data transmission over Rayleigh fading channels 失效
    提高Rayleigh衰落信道数据传输可靠性的方法

    公开(公告)号:US4641318A

    公开(公告)日:1987-02-03

    申请号:US727241

    申请日:1985-04-25

    申请人: Eric J. Addeo

    发明人: Eric J. Addeo

    摘要: A method and apparatus for reducing the bit error probability of data transmitted over a Rayleigh fading channel are disclosed.A relatively high bit rate serial stream of data is divided into N parallel relatively low bit rate streams of data. A controlled amount of intersymbol interference is introduced in the parallel streams. The N parallel streams are then transmitted simultaneously over the Rayleigh fading channel. Each bit in the N parallel stream of data has a duration longer than the duration of the typical Rayleigh fade. Thus there is a reduced probability that a Rayleigh fade will cause a bit error.

    摘要翻译: 公开了一种用于降低通过瑞利衰落信道发送的数据的比特错误概率的方法和装置。 相对高比特率的串行数据流被划分成N个并行的相对低比特率的数据流。 在并行流中引入受控量的符号间干扰。 然后N个并行流在瑞利衰落信道上同时传输。 N个平行数据流中的每个位具有比典型瑞利衰落持续时间长的持续时间。 因此,瑞利衰落会导致位错误的可能性降低。