公开(公告)号：US4536793A

公开(公告)日：1985-08-20

申请号：US456851

申请日：1983-01-10

申请人： John H. Harshbarger ,  William M. Shores

发明人： John H. Harshbarger ,  William M. Shores

IPC分类号： H04N5/10 ,  H04N5/06

CPC分类号： H04N5/10

摘要： A pulse stretching circuit for a raster display for causing certain vertical control pulses to either have the same widths or at least terminate at the same time in both the odd and even fields. The vertical blanking pulses or vertical sync pulses in the odd fields are stretched so that they terminate coincident with the trailing edges of the 2H rate horizontal blanking or sync pulses respectively.

摘要翻译： 用于光栅显示器的脉冲拉伸电路，用于使某些垂直控制脉冲具有相同的宽度或至少在奇数和偶数场中同时终止。 奇数场中的垂直消隐脉冲或垂直同步脉冲被拉伸，使得它们分别终止于2H速率水平消隐或同步脉冲的后沿。

公开(公告)号：US4670782A

公开(公告)日：1987-06-02

申请号：US699961

申请日：1985-02-08

申请人： John H. Harshbarger ,  William M. Shores

发明人： John H. Harshbarger ,  William M. Shores

IPC分类号： H04N17/04 ,  H04N5/06

CPC分类号： H04N17/04

摘要： A television video pattern generator system comprises a keyboard for entering pulse width and timing parameters for a video scanning rate. The individual incremental pulse width and timing parameters for the horizontal and vertical synchronizing waveforms are entered into a keyboard. A pattern selector selects a particular pattern which the operator wants to display on the video screen. The entered values are stored in a memory and a central processing unit processes the entered parameters and causes horizontal and vertical generators to generate the horizontal and vertical scan signals. A sync generator receives inputs from the horizontal and vertical generators and generates the scan rate. A pattern generator receives inputs from the sync generator and a pattern selector and generates a video display pattern in accordance with the selected pattern parameters and the selected scan rate parameters. If it is desired to compute a scan rate rather than to build a custom scan rate the central processing unit will automatically calculate a scan rate based upon enter parameters so that the individual pulse width of the scan rate pulses are expressed as a percentage of total horizontal line time.

摘要翻译： 电视视频图案发生器系统包括用于输入脉冲宽度的键盘和用于视频扫描速率的定时参数。 水平和垂直同步波形的各个增量脉冲宽度和时序参数输入到键盘中。 图案选择器选择操作者想要在视频屏幕上显示的特定图案。 输入的值存储在存储器中，中央处理单元处理输入的参数，并使水平和垂直发生器产生水平和垂直扫描信号。 同步发生器接收来自水平和垂直发生器的输入并产生扫描速率。 模式生成器接收来自同步发生器和模式选择器的输入，并根据所选择的模式参数和所选择的扫描速率参数产生视频显示模式。 如果希望计算扫描速率而不是建立自定义扫描速率，则中央处理单元将基于输入参数自动计算扫描速率，使得扫描速率脉冲的单个脉冲宽度表示为总水平的百分比 行时间。

公开(公告)号：US4518995A

公开(公告)日：1985-05-21

申请号：US548226

申请日：1983-11-02

申请人： John H. Harshbarger ,  William M. Shores

发明人： John H. Harshbarger ,  William M. Shores

IPC分类号： H04N17/04 ,  H04N7/02 ,  H04N5/06

CPC分类号： H04N17/045

摘要： A selectable rate sync generator system for use with a television test pattern generator includes a master oscillator of predetermined frequency, selector switches for selecting the desired total horizontal line time, and a horizontal line trigger circuit for generating a train of clock pulses having twice the repetition rate (2H) of the line time selected. H rate blanking and drive pulses are generated in response to the clock pulses. Selector switches are provided for selecting a desired number of horizontal scanning lines in two fields, and a vertical trigger circuit generates vertical trigger pulses having the repetition rate (V) of the number of lines selected. V rate blanking and drive pulses are generated in a response to the V trigger pulses, and the H and V rate blanking pulses are summed to provide a composite blanking signal. H rate sync pulses are generated in a response to the clock pulses and are delayed therefrom by a predetermined interval. V rate sync pulses are generated in a response to the V rate blanking pulses, and the H and V sync pulses are summed to provide a composite sync signal.

摘要翻译： 一种与电视测试图形发生器一起使用的可选择速率同步发生器系统，包括预定频率的主振荡器，用于选择期望的总水平线时间的选择开关，以及用于产生具有两次重复的时钟脉冲串的水平线触发电路 速率（2H）的行时间选择。 响应于时钟脉冲产生H速率消隐和驱动脉冲。 提供选择开关用于在两个场中选择所需数量的水平扫描线，并且垂直触发电路产生具有所选线数的重复频率（V）的垂直触发脉冲。 在对V触发脉冲的响应中产生V速率消隐和驱动脉冲，并且将H和V速率消隐脉冲相加以提供复合消隐信号。 H速率同步脉冲是在对时钟脉冲的响应中产生的，并以预定间隔从其延迟。 在对V速率消隐脉冲的响应中产生V速率同步脉冲，并且将H和V同步脉冲相加以提供复合同步信号。

公开(公告)号：US4417275A

公开(公告)日：1983-11-22

申请号：US196154

申请日：1980-10-10

申请人： John H. Harshbarger ,  William M. Shores

发明人： John H. Harshbarger ,  William M. Shores

IPC分类号： H04N17/04 ,  H04N5/06

CPC分类号： H04N17/045

摘要： A selectable rate sync generator system for use with a television test pattern generator includes a master oscillator of predetermined frequency, selector switches for selecting the desired total horizontal line time, and a horizontal line trigger circuit for generating a train of clock pulses having twice the repetition rate (2H) of the line time selected. H rate blanking and drive pulses are generated in response to the clock pulses. Selector switches are provided for selecting a desired number of horizontal scanning lines in two fields, and a vertical trigger circuit generates vertical trigger pulses having the repetition rate (V) of the number of lines selected. V rate blanking and drive pulses are generated in a response to the V trigger pulses, and the H and V rate blanking pulses are summed to provide a composite blanking signal. H rate sync pulses are generated in a response to the clock pulses and are delayed therefrom by a predetermined interval. V rate sync pulses are generated in a response to the V rate blanking pulses, and the H and V sync pulses are summed to provide a composite sync signal.

公开(公告)号：US4000428A

公开(公告)日：1976-12-28

申请号：US583199

申请日：1975-06-02

申请人： John H. Harshbarger

发明人： John H. Harshbarger

IPC分类号： H03K17/62 ,  H03K17/00

CPC分类号： H03K17/6257

摘要： An electronic switch in which first, second and third transistors are arranged in a group and provide for switching signals from a supply thereof to a signal buss. The source of signals is supplied to the base of the first transistor and from the emitter thereof to the base of the third transistor. The emitter of the third transistor is connected to the signal buss. The second transistor is connected between the signal path leading from the emitter of the first transistor to the base of the third transistor to ground and is controlled as to conductivity by the selective supply of voltage signals to the base thereof. The signal path from the source of signals to the signal buss is characterized in extremely low impedance when the switch is `ON` and in extremely high impedance when the switch is `OFF`, with the switch operating between on and off conditions extremely rapidly.

摘要翻译： 一种电子开关，其中第一，第二和第三晶体管组成一组，并提供将信号从其电源切换到信号总线。 信号源被提供给第一晶体管的基极并从其发射极提供到第三晶体管的基极。 第三晶体管的发射极连接到信号总线。 第二晶体管连接在从第一晶体管的发射极到第三晶体管的基极之间的接地的信号路径之间，并且通过选择性地向其基极提供电压信号来控制电导率。 从信号源到信号总线的信号路径的特征在于当开关为“开”时具有极低的阻抗，并且当开关为“关”时具有极高的阻抗，开关在导通和关断条件之间非常快速地工作。

公开(公告)号：US4509079A

公开(公告)日：1985-04-02

申请号：US464687

申请日：1983-02-07

申请人： John H. Harshbarger

发明人： John H. Harshbarger

IPC分类号： H04N5/10 ,  H04N5/24

CPC分类号： H04N5/10

摘要： The application relates to an interlace detector for a raster beam control circuit, such as in a television or computer display. Under 1:1 interlace conditions, depending on the condition of the logic at the time that the 1:1 interlace is selected, an odd field condition may result wherein the first half of the top horizontal line and the second half of the bottom horizontal line are blanked. The interlace detector detects this situation by detecting coincidence between a horizontal blanking pulse and the vertical reset pulse, and delays the transmission of the vertical reset pulse to the vertical field counter for one-half of the horizontal line scan time. This, in turn, delays vertical blanking so that a full line of information appears in the upper and lower lines of the display. In the specific embodiment disclosed, a bistable circuit triggered by horizontal blanking pulses and the undelayed vertical reset pulse produces the delayed vertical reset pulse.

摘要翻译： 本申请涉及一种用于光栅控制电路的交错检测器，例如在电视或计算机显示器中。 在1：1交错条件下，取决于选择1：1隔行扫描时的逻辑条件，可能会导致奇数场条件，其中顶部水平线的前半部分和底部水平线的后半部分 被空白。 隔行检测器通过检测水平消隐脉冲和垂直复位脉冲之间的一致性来检测这种情况，并且将垂直复位脉冲的传输延迟到水平行扫描时间的一半的垂直场计数器。 这反过来延迟了垂直消隐，使得整条信息出现在显示屏的上下两行。 在所公开的具体实施例中，由水平消隐脉冲和未延迟的垂直复位脉冲触发的双稳态电路产生延迟的垂直复位脉冲。

公开(公告)号：US4568975A

公开(公告)日：1986-02-04

申请号：US637150

申请日：1984-08-02

申请人： John H. Harshbarger

发明人： John H. Harshbarger

IPC分类号： H04N17/04

CPC分类号： H04N17/04

摘要： A method and apparatus for measuring the Gray Scale characteristics of a CRT display wherein a luminance meter surveys a ten percent portion of the total surface area of the screen of the CRT display screen. The luminance meter is positioned far enough from the screen so that the cone surveyed by the luminance meter will intersect the plane of the screen to cause ten percent of the screen surface area to be surveyed. A special test pattern is generated for display on the CRT screen whereby a surveyed area is provided having a sufficiently large surface area and being of uniform brightness. The test pattern also provides for an additional screen area equal in size to the surveyed area. The average picture level for the surveyed area and the non-surveyed area is maintained at fifty percent of peak picture level while the brightness of the surveyed area is varied in incremental steps through the Gray Scale. The test pattern also provides for another portion of the screen having three contiguous areas having brightness levels of whiter than black, black, and blacker than black, respectively. An additional area of the test pattern is provided which together with the black areas provide for a fifty percent average picture level. The APL for the entire screen is maintained at fifty percent. As the surveyed area brightness level is varied through the Gray Scale, the luminance meter measures the brightness whereby the Gray Scale performance of the CRT display can be measured. The black areas of the screen are monitored visually to ensure that the black level setting for the CRT display is proper throughout the test.

摘要翻译： 一种用于测量CRT显示器的灰度特性的方法和装置，其中亮度计测量CRT显示屏幕的屏幕的总表面积的百分之十。 亮度计距离屏幕足够远，使得由亮度计测量的锥体将与屏幕的平面相交，以使得屏幕表面积的百分之几被测量。 产生用于显示在CRT屏幕上的特殊测试图案，由此提供具有足够大的表面积并且具有均匀亮度的测量区域。 测试模式还提供了与被测区域大小相等的附加屏幕区域。 被调查区域和非调查区域的平均图像水平保持在峰值图像水平的百分之五十，而被测区域的亮度通过灰度级增量逐步变化。 测试图案还提供屏幕的另一部分具有分别具有黑色，黑色和黑色黑色的亮度级别的三个连续区域。 提供了测试图案的附加区域，其与黑色区域一起提供了百分之五十的平均图像水平。 整个屏幕的APL保持在百分之五十。 由于通过灰度级调查区域亮度水平变化，亮度计测量亮度，从而可以测量CRT显示器的灰度性能。 屏幕的黑色区域被视觉监控，以确保整个测试中CRT显示屏的黑电平设置正确。

公开(公告)号：US4536792A

公开(公告)日：1985-08-20

申请号：US554843

申请日：1983-11-23

申请人： John H. Harshbarger

发明人： John H. Harshbarger

IPC分类号： H04N17/04 ,  H04N7/02

CPC分类号： H04N17/04

摘要： A method and apparatus for testing the geometry of a cathode ray tube raster scan under beam duty cycle variation. Alternate polarities of white on black and black on white images of a test pattern are displayed on the CRT screen, and the displacement of a reference point from one polarity to the other is measured to determine quantitatively the amount of displacement. Preferably, the pattern comprises a plurality of regularly arranged and spaced graphic elements, such as a bar, dot or dot grating pattern, wherein the pattern occupies a low percentage of the screen area. By alternately switching the polarity, the electron beam of the CRT undergoes wide swings in the amount of current it draws from the high voltage supply, and the amount of image displacement and size deviation can be readily measured.

摘要翻译： 一种用于在波束占空比变化下测试阴极射线管光栅扫描的几何形状的方法和装置。 在CRT屏幕上显示测试图案上的白色黑色和白色图像上的白色的交替极性，并且测量参考点从一种极性到另一种极性的位移以定量地确定位移量。 优选地，图案包括多个规则排列和间隔的图形元素，例如条形，点状或点状光栅图案，其中图案占据屏幕区域的低百分比。 通过交替切换极性，CRT的电子束以高电压供给的电流量发生大的波动，并且可以容易地测量图像位移量和尺寸偏差。

公开(公告)号：US3979741A

公开(公告)日：1976-09-07

申请号：US583198

申请日：1975-06-02

申请人： John H. Harshbarger

发明人： John H. Harshbarger

IPC分类号： G01R19/145 ,  G01R31/02 ,  G08B21/00

CPC分类号： G01R19/145 ,  G01R31/021

摘要： A power loss alarm system in which an electric power supply is connected to a relay so that the relay is energized while the power supply is on. If the power supply fails, or if the voltage is reduced below a certain minimum amount, the relay is de-energized and an alarm signal is activated. The alarm signal is connected to second source of electric power, a battery, for example, so that power loss in the power circuit will not prevent actuation of the alarm. The system includes a selector switch having an "OFF" position, an "ON" or "RETURN" position in which the system is checked and is also operative to sound the alarm when power returns to the system, and a "LOSS" position in which the system is operative to indicate the occurrence of loss of power.

摘要翻译： 一种电力损失报警系统，其中电源连接到继电器，使得继电器在电源接通时被通电。 如果电源出现故障，或者电压降低到一定的最小值以下，继电器断电，报警信号被激活。 报警信号例如连接到第二电源，电池，使得电源电路中的功率损耗不会阻止报警器的致动。 该系统包括具有“OFF”位置，“ON”或“RETURN”位置的选择开关，其中系统被检查并且还可用于在电源返回到系统时发出报警，并且在“返回” 该系统用于指示电力损失的发生。

公开(公告)号：US4533950A

公开(公告)日：1985-08-06

申请号：US478157

申请日：1983-03-23

申请人： John H. Harshbarger

发明人： John H. Harshbarger

IPC分类号： H04N17/04 ,  H04N7/02

CPC分类号： H04N17/04

摘要： The method for testing the linearity and other raster scan geometry of a television display apparatus or a television camera. The method is used when the display apparatus or camera being tested has a scan rate which cannot match the currently used EIA linearity chart due to fundamental differences in the raster structure and can also be used on the 525/60 scan rate as used in broadcast mode without requiring the unusual alternate count required for the EIA chart. In testing a display apparatus, a bar or dot pattern is formed on the screen by a test pattern generator wherein the spacing of the horizontal rows of dots or bars is selected to correspond to a particular scan rate. A linearity chart having a geometry corresponding to that scan rate is selected from a plurality of test charts and the image thereof is projected on the screen to match, as closely as possible, the dots or bar intersections on the screen. The amount of non-linearity can be quantified by noting the positions of the dots or bar intersections relative to the concentric annuli of each graphic element making up the chart. The television camera can be tested in a similar fashion by viewing the selected linearity chart and superimposing the image produced by the camera with the dot or bar pattern of the selected scan rate produced by the test pattern generator.

摘要翻译： 用于测试电视显示装置或电视摄像机的线性和其它光栅扫描几何形状的方法。 当被测试的显示设备或照相机具有与光栅结构中的基本差异不同的当前使用的EIA线性图的扫描速率时使用该方法，并且还可以在广播模式中使用的525/60扫描速率 而不需要EIA图表所需的异常备用计数。 在测试显示装置时，通过测试图形发生器在屏幕上形成条形或点阵图案，其中选择水平行的点或条的间隔以对应于特定的扫描速率。 从多个测试图中选择具有对应于该扫描速率的几何的线性图，并且将其图像投影在屏幕上以尽可能接近地匹配屏幕上的点或条交叉点。 可以通过注意点或条形交叉点相对于构成图表的每个图形元素的同心环的位置来量化非线性量。 可以通过观察选定的线性图并且利用由测试图案发生器产生的所选择的扫描速率的点阵或条形图案叠加由相机产生的图像，来以类似的方式测试电视摄像机。