A

Ampere (Amp)

AC

Alternating Current (i.e. not DC)

AC-3

Audio Compression Standard

ACATS

Advisory Committee on Advanced Television Service

ACTV

Advanced Compatible Television

ADC

Analog to Digital Converter

AD-HDTV

Advanced Digital High-Definition Television

A/D

Analog to Digital Converter

ADTT

Advanced Digital Television Technologies

AES

Audio Engineering Society

AFC

Automatic Frequency Control

AGC

Automatic Gain Control

AM

Amplitude Modulation

ANSI

American National Standards Institute

API

Application Programming Interface

APL

Average Picture Level

ASCII

American Standard Code for Information Exchange

ASIC

Application Specific Integrated Circuit

ASK

Amplitude-Shift Keying