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    System and method of automated testing of a compressed digital broadcast video network
    1.
    发明授权
    System and method of automated testing of a compressed digital broadcast video network 失效
    压缩数字广播视频网络的自动测试系统和方法

    公开(公告)号：US06411623B1

    公开(公告)日：2002-06-25

    申请号：US09221864

    申请日：1998-12-29

    申请人： Leonard DeGollado ,  Karl J. Kuhn ,  Leung P. Lee ,  John Mark Zetts

    发明人： Leonard DeGollado ,  Karl J. Kuhn ,  Leung P. Lee ,  John Mark Zetts

    IPC分类号： H04L1226

    CPC分类号： H04N21/64307 ,  H04L43/50 ,  H04L2012/5618 ,  H04L2012/5664 ,  H04N17/004 ,  H04Q11/0478

    摘要： A switched, digital high-broadband network provides automated control and in-service and out-of-testing of analog video signals, encoded and decoded real time, into MPEG 2 digitized format with a high level of security and protection of content and without attendant degradation of the analog signal sometimes experienced in satellite transmissions. The switch network, typically an asynchronous transfer mode (ATM) network, has multiple gateways for connection to video signal sources and sinks. Each gateway includes an analog/digital video switch for receiving the video signals and distributing them to an MPEG 2 encoder for conversion into digital packets. A multiplexer is coupled to the encoder and a digital switch for inserting the multiplexed signal into the switched ATM network. The multiplexer and the digital switch encode destination address information into the digital packets to ensure proper routing. Each gateway further includes a de-multiplexer and MPEG 2 decoder connected to the digital switch for separating the digital packets from the ATM network into separate MPEG 2 streams subsequently decoded into analog video and returned to the video sinks. A command and control center is coupled to each gateway for remote testing of point-to-point and point-to-multipoint circuits; testing a switch circuit before and after the establishment of a connection to a customer; in service testing of MPEG 2 encoding content; detecting and isolating digital network problems, and off-line network testing and automating network utilization. The command and control center includes test executives which ensure the quality and availability of video traffic. The test executives run continuously run without manual intervention providing network operators with network status through user consoles.

    摘要翻译： 一种交换式数字高宽带网络可以将MPEG 2数字化格式的模拟视频信号进行自动化控制和在线测试，并进行编码和解码，具有高度的安全性和内容保护，无需服务员 卫星传输有时会出现模拟信号的恶化。 交换网络，通常是异步传输模式（ATM）网络，具有用于连接到视频信号源和接收器的多个网关。 每个网关包括用于接收视频信号的模拟/数字视频开关，并将它们分配到MPEG 2编码器以转换成数字分组。 多路复用器耦合到编码器和数字开关，用于将多路复用信号插入交换式ATM网络。 多路复用器和数字交换机将目的地址信息编码到数字分组中，以确保正确的路由。 每个网关还包括连接到数字交换机的去多路复用器和MPEG 2解码器，用于将数字分组从ATM网络分离成单独的MPEG 2流，随后解码成模拟视频并返回到视频接收器。 命令和控制中心耦合到每个网关，用于远程测试点对点和点对多点电路; 在与客户建立连接之前和之后测试开关电路; 在MPEG 2编码内容的服务测试中; 检测和隔离数字网络问题，离线网络测试和自动化网络利用。 指挥和控制中心包括测试主管，确保视频流量的质量和可用性。 测试主管持续运行，无需手动干预，通过用户控制台为网络运营商提供网络状态。

    System and method of in-service testing of compressed digital broadcast video
    2.
    发明授权
    System and method of in-service testing of compressed digital broadcast video 有权
    压缩数字广播视频在线测试的系统和方法

    公开(公告)号：US06297845B1

    公开(公告)日：2001-10-02

    申请号：US09221865

    申请日：1998-12-29

    申请人： Karl J. Kuhn ,  John Mark Zetts

    发明人： Karl J. Kuhn ,  John Mark Zetts

    IPC分类号： H04N1700

    CPC分类号： H04N17/004

    摘要： A switched digital video broadcast network provides in-service testing of digitized broadcast video signals subject to analog-to-digital and digital-to-analog conversion. The network includes a plurality of gateways, each gateway coupled to video signal sources and sink. Video frames transmitted on the network are subject to analog-to-digital and digital-to-analog conversion and compression in an MPEG 2 encoder/decoder. Each gateway and includes a test pattern generator and test measurement analyzer for in-service testing of the video signals. The test pattern generator inserts a test signal on pre-selected lines (22, 23 or 261,262) in a Video Blanking Interval (VBI) and time periods of a video frame. The test signal may be dynamically placed at any location in the frame using concealment techniques The video lines are not seen by television viewers. The test pattern generator and test measurement analyzer are synchronized using vertical integral time code and a trigger packet sent by the transmitting station. The test signals enable both in-service and out-of-service testing to be performed for the entire suite of EIA/TIA 250C standard video tests.

    摘要翻译： 交换数字视频广播网络提供经过模数转换和数模转换的数字广播视频信号的在线测试。 网络包括多个网关，每个网关耦合到视频信号源和宿。 在网络上发送的视频帧在MPEG 2编码器/解码器中进行模数转换和数模转换和压缩。 每个网关包括一个测试模式发生器和测试测量分析仪，用于视频信号的在线测试。 测试图形发生器在视频消隐间隔（VBI）和视频帧的时间段内将预测线（22,23或261,262）上的测试信号插入。 测试信号可以使用隐藏技术动态地放置在帧中的任何位置。电视观看者看不到视频线。 测试模式发生器和测试测量分析仪使用垂直积分时间码和发送站发送的触发数据包进行同步。 测试信号使得能够在整个EIA / TIA 250C标准视频测试套件中执行在线和失效测试。

    Apparatus and method of in-service audio/video synchronization testing
    4.
    发明授权
    Apparatus and method of in-service audio/video synchronization testing 失效
    在线音频/视频同步测试的装置和方法

    公开(公告)号：US06414960B1

    公开(公告)日：2002-07-02

    申请号：US09221868

    申请日：1998-12-29

    申请人： Karl J. Kuhn ,  John Mark Zetts

    发明人： Karl J. Kuhn ,  John Mark Zetts

    IPC分类号： H04L1256

    CPC分类号： H04N21/4305 ,  H04L2012/5628 ,  H04L2012/5664 ,  H04N7/088 ,  H04N17/00 ,  H04N17/004 ,  H04Q11/0478

    摘要： An apparatus and method provide non-intrusive in-service testing of audio/video synchronization testing without using traditional audio marker tones. The network includes an A/V synchronous test signal generator which injects video and audio markers into the video and audio non-intrusively and routes the two signals into a switch where they are switched into a channel for encoding and transmission via the ATM network. At the distant end the signal is decoded and routed by a switch into the A/V test generator and measurement set where the markers are detected and the A/V skew calculated, after which the audio and video are routed to the subscriber. The A/V test set signal generator includes a Video Blanking Interval (VBI) test signal generator and a white noise generator, the former injecting a marker into the video signal and the later injecting an audio marker into the audio signal. The video marker is injected into the VBI and broadband, background audio noise to measure the delay between the audio and video components of a broadcast. The marking of the audio is accomplished by gradually injecting white noise into the audio channel until the noise level is 6 dB above the noise floor of the audio receiver. As a precursor A/V sync signal, a small spectrum of the white noise is notched or removed. This signature precludes inadvertent recognition of program audio noise as the audio marker.

    摘要翻译： 一种装置和方法提供音频/视频同步测试的非侵入式在线测试，而不使用传统的音频标记音。 该网络包括一个A / V同步测试信号发生器，它将视频和音频标记非侵入地注入到视频和音频中，并将这两个信号路由到交换机，在那里它们被切换成用于通过ATM网络进行编码和传输的信道。 在远端，信号被解码并通过交换机路由到A / V测试发生器和测量集合中，其中检测到标记并计算A / V偏差，之后将音频和视频路由到订户。 A / V测试设置信号发生器包括视频消隐间隔（VBI）测试信号发生器和白噪声发生器，前者将视频信号注入标记，然后将音频标记注入到音频信号中。 将视频标记注入到VBI和宽带背景音频噪声中，以测量广播的音频和视频组件之间的延迟。 音频的标记是通过将音频通道逐渐注入白噪声，直到噪声电平高于音频接收器的本底噪声6 dB来实现的。 作为前兆A / V同步信号，白噪声的小频谱被切掉或去除。 该签名排除了无意识认为节目音频噪声作为音频标记。