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公开(公告)号：US5387925A
公开(公告)日：1995-02-07
申请号：US673167
申请日：1991-03-18
CPC分类号： H04N17/00
摘要： A test signal generator applies a test pattern to a device under test. The output of the device under test is displayed on a video picture monitor. The test signal generator inserts a cursor into the test pattern, the position of the cursor within the test pattern being variable. From the cursor the test signal generator also generates a trigger signal. The trigger signal may be used to trigger the horizontal sweep of a waveform display device to which the output of the device under device is input. By observing the picture monitor an operator may adjust the cursor to a position just prior to an anomaly in the displayed test pattern so that only that portion of the output waveform of the device under test in the vicinity of the cursor is displayed on the waveform display device.
摘要翻译： 测试信号发生器将测试图案应用于被测设备。 被测设备的输出显示在视频监视器上。 测试信号发生器将光标插入到测试模式中，测试模式中光标的位置是可变的。 从光标开始，测试信号发生器也产生一个触发信号。 触发信号可以用于触发输入装置的输出的波形显示装置的水平扫描。 通过观察图像监视器，操作者可以将光标调整到刚刚显示的测试图案中的异常之前的位置，使得仅在光标附近的被测设备的输出波形的那部分显示在波形显示器上 设备。
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公开(公告)号：US5274445A
公开(公告)日：1993-12-28
申请号：US663220
申请日：1991-03-01
CPC分类号： H04N17/004
摘要： A three-dimensional test signal for a video codec is generated by injecting a conventional foreground test signal at a predetermined location as a foreground component within a background test signal as a background component, the background component having a variable complexity. The three-dimensional test signal is input to the video codec and the output of the video codec is measured using conventional measurement instruments. The background component may be a pseudo-random noise signal, a zone plate signal or other variable complexity-type signal, with the foreground component occurring at greater intervals than the neighboring pixels used by the codec compression algorithm. The conventional measurement instruments display only the foreground component with distortions in the video codec caused by the complexity of the background component appearing in the display. A spectral display of the output of the video codec using a zone plate signal as the background component may also be used to characterize the video codec performance.
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公开(公告)号：US5049880A
公开(公告)日：1991-09-17
申请号：US503009
申请日：1990-04-02
申请人： Douglas C. Stevens
发明人： Douglas C. Stevens
CPC分类号： G06T9/005 , H03M7/3088 , H03M7/46
摘要： A method of compressing a digitized waveform into a sequence of N-bit words includes selecting corresponding bit values from N data words and generating a value based thereon. A next N input words are selected and the corresponding bits are used to generate a next value. The process is continued for each significant bit of the input sequence and the generated value stream is run-length encoded to produce a compressed data output stream.
摘要翻译： 将数字化波形压缩为N位字序列的方法包括从N个数据字中选择相应的位值，并基于此产生一个值。 选择下一个N个输入字，并使用相应的位来产生下一个值。 对输入序列的每个有效位继续该过程，并且生成的值流被运行长度编码以产生压缩数据输出流。
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公开(公告)号：US07876355B2
公开(公告)日：2011-01-25
申请号：US11405928
申请日：2006-04-17
申请人： Douglas C. Stevens
发明人： Douglas C. Stevens
IPC分类号： H04N17/00
CPC分类号： H04N17/004
摘要： Methods and apparatuses to detect presence of undesirable video abnormalities during, for example, video ingest or playback. These undesirable characteristics may include an average picture level that is less than a preset threshold value, or static input, in which the content does not change over a significant number of frames. Detection of abnormalities results in an alarm to a system operator. Analysis and alarm may occur automatically during processing of video data streams. The same abnormalities may be detected during playback of the image data.
摘要翻译： 在例如视频摄取或播放期间检测不期望的视频异常的存在的方法和装置。 这些不期望的特征可以包括小于预设阈值的平均图像水平，或者静态输入，其中内容在大量帧上不改变。 检测异常会对系统操作员造成警报。 在视频数据流的处理期间可能会自动发生分析和报警。 在图像数据的回放期间可以检测到相同的异常。
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5.发明授权Digital disk recorder using a port clock having parallel tracks along a timeline with each track representing an independently accessible media stream 失效数字磁盘记录器使用具有沿着时间线的平行轨道的端口时钟，每个轨道表示独立可访问的媒体流
公开(公告)号：US5642497A
公开(公告)日：1997-06-24
申请号：US380273
申请日：1995-01-30
申请人： Errol C. Crary , Richard W. Stallkamp , Laurence J. Morandi , Douglas C. Stevens , Alexandru Mitaru
发明人： Errol C. Crary , Richard W. Stallkamp , Laurence J. Morandi , Douglas C. Stevens , Alexandru Mitaru
IPC分类号： H04N5/76 , G06F13/10 , G06F17/30 , G11B20/10 , G11B27/00 , G11B27/034 , H04N5/92 , G06F13/00
CPC分类号： G11B27/034 , G06F13/102 , G11B27/002 , G11B2220/20 , G11B2220/41
摘要： An application programming interface for a digital disk recorder uses a port to link resources together to form a multimedia recorder that emulates a tape recorder while retaining the flexibility of the digital disk recorder. The port is a matrix of timelines for each resource, with each track in the port representing a media stream associated with a different one of the resources. A dynamic subsystem controls recording and playing back multimedia between the resources and a disk file system of the digital disk recorder using the port. A static subsystem maintains on the disk file system a database of movies recorded by the digital disk recorder from the resources according to the port, with each movie being a collection of media files for each resource that are independently accessible.
摘要翻译： 用于数字磁盘记录器的应用编程接口使用端口将资源链接在一起，以形成模拟磁带录像机的多媒体记录器，同时保持数字磁盘记录器的灵活性。 端口是每个资源的时间线矩阵，端口中的每个轨道表示与不同资源相关联的媒体流。 动态子系统控制资源与使用该端口的数字磁盘录像机的磁盘文件系统之间的多媒体记录和回放。 静态子系统在磁盘文件系统上维护由数字磁盘记录器根据端口的资源记录的电影的数据库，每个电影是可独立访问的每个资源的媒体文件的集合。
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公开(公告)号：US5455620A
公开(公告)日：1995-10-03
申请号：US184156
申请日：1994-01-21
CPC分类号： H04N17/02
摘要： A system for automatic generation of vector reference graticules for a vectorscope display acquires the active video portion of a video signal that includes a color bar test signal. The values for each color difference component at each reference color plateau for the acquired color bar test signal are averaged to provide horizontal and vertical displacement values for each reference color, including black. Graticule boxes are electronically generated and positioned for each reference color on a display according to the respective horizontal and vertical displacement values.
摘要翻译： 用于自动生成用于矢量显示器显示器的矢量参考刻度的系统获取包括彩条测试信号的视频信号的有效视频部分。 对于所获取的色条测试信号，在每个参考色平台处的每个色差分量的值被平均以提供包括黑色的每个参考颜色的水平和垂直位移值。 根据相应的水平和垂直位移值，电子地生成并定位在显示器上的每个参考颜色的刻度框。
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公开(公告)号：US4754205A
公开(公告)日：1988-06-28
申请号：US909972
申请日：1986-09-22
CPC分类号： G01R13/22
摘要： An instrument for providing a principal display representing the variation of a first quantity as a function of a second quantity, comprises a display screen. A visually distinct dot is generated on the display screen and is deflected along one of two orthogonal axes in dependence upon the value of the first quantity and along the other axis in dependence upon the value of the second quantity. The dot is additionally deflected to selected positions along the two axes to generate an auxiliary display of a marker and of an information-conveying character adjacent the marker. The position of the auxiliary display is adjustable along at least one of the axes.
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公开(公告)号：US5214508A
公开(公告)日：1993-05-25
申请号：US834963
申请日：1992-02-14
申请人： Douglas C. Stevens
发明人： Douglas C. Stevens
CPC分类号： H04N17/004 , G06T9/007 , H04N7/24
摘要： Spatial bandwidth testing for digital data-compressed video systems is performed using a complex, or high entropy, test signal. A portion of the test signal is acquired as a control frame. This control frame is divided into a plurality of blocks. Each block is processed by a two-dimensional Discrete Fourier Transform (DFT). The test signal is input to a digital data-compressed video system and a corresponding portion of the output of the video system, a test frame, is acquired and processed in the same manner as the control frame. The resulting coefficient arrays from the control and test frames are compared to each other to obtain an output array of ratios for each block. The ratio of those coefficients corresponding to the predominant frequency of each block of the control frame are displayed as a three-dimensional gain plot. The ratio of those coefficients corresponding to low frequencies of each block of the control frame are displayed as a three-dimensional noise plot. The resulting plots provide an objective, visual indication of the characteristics of the digital data-compressed video system.
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公开(公告)号：US4868465A
公开(公告)日：1989-09-19
申请号：US902363
申请日：1986-08-29
申请人： Douglas C. Stevens , Henry G. Fox
发明人： Douglas C. Stevens , Henry G. Fox
CPC分类号： G01R13/24
摘要： A delay time between the start of a trace on an oscilloscope screen and a point along the trace is computed based on measured "sweep gain" and "sweep start" parameters characterizing a triggered sweep signal controlling the horizontal position of an electron beam creating the trace, the sweep signal increasing when triggered from a starting level at a constant slew rate to move the beam at a constant speed across the screen. The sweep start parameter is the value of input data applied to a digital-to-analog converter (DAC) which would cause the DAC to produce an output voltage equal to the sweep signal starting level, and the sweep gain indicates the rate of increase in DAC input data required to produce a DAC output signal with a rate of increase similar to the slew rate of the sweep signal. The horizontal position of the point along the trace is the beam position on the screen at the moment the sweep signal magnitude reaches the magnitude of the DAC output signal. The delay time is computed as the difference between the DAC input data resulting in this DAC output signal magnitude and the sweep start parameter, the difference being divided by the sweep gain parameter.
摘要翻译： 基于测量的“扫描增益”和“扫描起始”参数来计算示波器屏幕上的迹线开始和沿着迹线的点之间的延迟时间，其表征触发的扫描信号，其控制电子束的水平位置，产生迹线 ，当以恒定的转换速率从起始电平触发时，扫描信号增加，以在屏幕上以恒定的速度移动光束。 扫描启动参数是应用于数/模转换器（DAC）的输入数据的值，这将导致DAC产生等于扫描信号起始电平的输出电压，扫描增益表示增益率 产生DAC输出信号所需的DAC输入数据，其速率与扫描信号的转换速度相似。 沿扫描线的点的水平位置是扫描信号幅度达到DAC输出信号幅度的屏幕上的光束位置。 延迟时间被计算为导致该DAC输出信号幅度的DAC输入数据与扫描启动参数之间的差，该差除以扫描增益参数。
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公开(公告)号：US4743845A
公开(公告)日：1988-05-10
申请号：US908551
申请日：1986-09-17
CPC分类号： G01R13/22
摘要： In an oscilloscope, a readout control circuit is adapted to create a horizontal cursor on an oscilloscope screen at a vertical level controlled by cursor level data generated by a microcomputer, and to cause the beam to form characters on the screen indicating a voltage represented by the vertical level of the cursor. Vertical offset and vertical gain parameters characterizing a vertical preamplifier system controlling display of a waveform are measured and utilized to determine the value of cursor level data needed to cause the readout control circuit to position the cursor on the screen to accurately reflect a selected voltage with respect to voltage magnitudes represented by points on the displayed waveform. The oscilloscope is adapted to measure peak magnitudes of a vertical preamplifier input signal, and the readout control circuit permits the oscilloscope to display a cursor on a screen at a level indicating the magnitude of the measured peak with respect to magnitudes represented by a displayed waveform.
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