Chapter 20: Glossary

8-VSB: See Vestigial Sideband.

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AC-3

An early name for Dolby Digital.

AC'97, AC'98

These are definitions by Intel for the audio I/O implementation for PCs. Two chips are defined: an analog audio I/O chip and a digital controller chip. The digital chip will eventually be replaced by a software solution. The goal is to increase the audio performance of PCs and lower cost.

AC Coupled

AC coupling passes a signal through a capacitor to remove any DC offset, or the overall voltage level that the video signal "rides". One way to find the signal is to remove the DC offset by AC coupling, and then do DC restoration to add a known DC offset (one that we selected). Another reason AC coupling is important is that it can remove large (and harmful) DC offsets.

Active Video

The part of the video waveform that contains picture information. Most of the active video, if not all of it, is visible on the display.

A/D, ADC

Analog-to-Digital Converter. This device is used to digitize audio and video. An ADC for digitizing video must be capable of sampling at 10 to 150 million samples per second (MSPS).

AFC

See Automatic Frequency Control (AFC).

AGC

See Automatic Gain Control (AGC).

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Video Demystified: A Handbook for the Digital Engineer, Fourth Edition

TABLE OF CONTENTS

Chapter 20: Glossary

Numbers

A

Video Demystified: A Handbook for the Digital Engineer, Fourth Edition

TABLE OF CONTENTS

Chapter 20: Glossary

Numbers

A

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