Method and apparatus for the generation of mixed REFRESH and ROLL mode display in a CRT
First Claim
1. A method of displaying data on a display screen on either side of a trigger point upon occurrence of a trigger event, comprising the steps of:
- displaying new data as the new data is acquired at the trigger point and rolling old data toward and off a first end of the display screen;
detecting the trigger event;
freezing the data being displayed on the display screen between the trigger point and the first end; and
displaying post-trigger event data continuously from the trigger point toward and to a second end of the display screen as the post-trigger event data is acquired.
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Accused Products
Abstract
According to a method and apparatus for displaying data on a display screen, such as the screen of a digital storage oscilloscope, in a ROLL mode and prior to a trigger event, newly acquired data is continuously newly displayed at a given point on the screen as the oldest displayed data is rolled off the screen at a first side. This is continued even during a REFRESH mode until a trigger event occurs, at which time the displayed data is frozen on the screen and newly acquired data is written across the screen toward a second side of the screen, so that at the time the newly acquired data is written to the second end of the screen, data is observable which represents a certain period before the trigger event and after the trigger event.
20 Citations
6 Claims
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1. A method of displaying data on a display screen on either side of a trigger point upon occurrence of a trigger event, comprising the steps of:
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displaying new data as the new data is acquired at the trigger point and rolling old data toward and off a first end of the display screen; detecting the trigger event; freezing the data being displayed on the display screen between the trigger point and the first end; and displaying post-trigger event data continuously from the trigger point toward and to a second end of the display screen as the post-trigger event data is acquired.
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2. An apparatus for displaying data on a display screen having first and second ends and a trigger point therebetween, comprising:
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acquisition means for acquiring data to be displayed on the display screen; memory means for storing the data acquired by said acquisition means; addressing means, operatively connected to said memory means and the display screen, for controlling the displaying of the data stored in said memory means on the display screen before a trigger event so that data newly acquired by said acquisition means and stored in said memory means is displayed at the trigger point as it becomes available and data previously acquired and displayed is rolled toward the first end of the display screen; and arresting means for arresting the rolling of the displayed data toward the first end a predetermined time after an occurrence of the trigger event and displaying post-trigger data sequentially and continuously between the trigger point and the second end of the display screen as the post-trigger data is acquired. - View Dependent Claims (3, 4, 5, 6)
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Specification