| Patent Number |
Title Of Patent |
Date Issued |
| 4670782 |
Television video pattern generator system |
June 2, 1987 |
| 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. |
| 4568975 |
Method for measuring the gray scale characteristics of a CRT display |
February 4, 1986 |
| 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 su |
| 4536793 |
Pulse stretching circuit for a raster display |
August 20, 1985 |
| 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 t |
| 4536792 |
Method and apparatus for testing a CRT display under beam duty cycle variation |
August 20, 1985 |
| 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 polari |
| 4533950 |
Method of testing the linearity of a raster scan |
August 6, 1985 |
| 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 |
| 4518995 |
Selectable rate sync generator system |
May 21, 1985 |
| 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 |
| 4509079 |
Interlace detector |
April 2, 1985 |
| 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 where |
| 4417275 |
Selectable rate sync generator system |
November 22, 1983 |
| 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 |
| 4000428 |
Electronic switch |
December 28, 1976 |
| 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 |
| 3991388 |
Start-stop transistor colpitts oscillator circuit |
November 9, 1976 |
| A start-stop oscillator circuit in which the oscillator circuit includes an inductor connected in parallel with a pair of serially connected capacitors. The inductor and capacitors form the tank circuit for the oscillator which is in the form of a Colpitts oscillator. In order to sta |
| 3979741 |
Power loss alarm system |
September 7, 1976 |
| 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 ac |
