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30 Appendix A: Glossary
Glossary
• AGC
Automatic Gain control. Used to keep the output signal of a circuit constant as the
input signal amplitude varies.
• Bandwidth
A term describing the capacity to transfer data. Greater bandwidth is needed to
sustain a higher transfer rate. Greater bandwidth can be achieved, for example, by
using a wider bus.
• Bus
A pathway along which signals are sent, generally in two directions, for
communication of data.
• Composite sync
A synchronization signal made up of two components: one horizontal and one
vertical.
• DCF
Digitizer Configuration Format. A DCF defines the input data format and among
other things, how to accept or generate video timing signals such as horizontal
sync, vertical sync, and pixel clock.
• Field
One of the two halves that make up an image. One half consists of the image's
odd lines (known as the odd field); the other half consists of the image's even lines
(known as the even field).
• Frame
A single image grabbed from a video camera.
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