Dalsa PC2-Comp Express OC-P2EM-COMP0, User Manual

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PC2-Comp Express Glossary of Terms
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Glossary of Terms
ADC
Analog-to-Digital conversion is an electronic process in which a continuously variable
(analog) signal is changed, without altering its essential content, into digital data.
Back Porch
The portion of the video waveform between the end of horizontal sync and the start of active
video.
Bandwidth
Describes the measure of data transfer capacity. A computer system’s PCI expansion bus is
rated for a maximum peak data bandwidth of 132 MB/s. PCI devices must share the
maximum PCI bus bandwidth when transferring data to and from system memory or other
devices.
Blanking
The part of the video signal where the CRT scanning beam is blanked so that it can track back
to the starting point without drawing diagonal lines across the screen. Horizontal blanking
occurs when the signal is blanked to track back horizontally from right to left. Vertical
blanking retraces the beam from the bottom to the starting point (top).
Bus
A common pathway, or channel, between multiple devices. Besides the computer's internal
bus to memory and system components, peripheral buses such as PCI and AGP, allow adding
or changing devices that make up the computer system.
Clamper Circuit
A circuit that establishes a fixed level for the video signal at the beginning of each scanning
line. Also know as "DC restoration".
Composite Video
A video signal that is composed of the luminance and color information plus the
synchronization signals together. Common composite video formats are NTSC and PAL.
Contiguous Memory
A block of physical memory occupying consecutive addresses.