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Glossary
NI-IMAQ User Manual G-2
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National Instruments Corporation
active line region the region of lines actively being stored; defined by a line start (relative to
VSYNC) and a line count
active pixel region the region of pixels actively being stored; defined by a pixel start (relative
to HSYNC) and a pixel count
A/D analog-to-digital
ADC analog-to-digital converter—an electronic device, often an integrated
circuit, that converts an analog voltage to a digital number
address character code that identifies a specific location (or series of locations)
in memory
ANSI American National Standards Institute
antichrominance filter removes the color information from the video signal
API application programming interface
AQ_DONE signals that the acquisition of a frame or field is completed
AQ_IN_PROGRESS signals that the acquisition of video data is in progress
area a rectangular portion of an acquisition window or frame that is controlled
and defined by software
array ordered, indexed set of data elements of the same type
ASIC Application-Specific Integrated Circuit—a proprietary semiconductor
component designed and manufactured to perform a set of specific
functions for a specific customer
aspect ratio the ratio of a picture or image’s width to its height
B
b bit—one binary digit, either 0 or 1
B byte—eight related bits of data, an eight-bit binary number; also used to
denote the amount of memory required to store one byte of data
back porch the area of the video signal between the rising edge of the horizontal sync
signal and the active video information
UM.book Page 2 Monday, July 13, 1998 9:49 AM