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A stereo component that outputs to speakers, and increases 
the gain or level of an audio signal. An amplifier doesn’t 
typically include a radio.

Also referred to as Enhanced for Widescreen, or Enhanced 
for 16:9. The process that horizontally shrinks a 16:9 image 
into a 4:3 space to convert images between widescreen and 
typical television image aspect ratio. Used on many DVDs.

The ratio of image width to image height. Common motion-
picture ratios are 1.85:1 and 2.35:1. Television screens are 
usually 1.33:1 (also known as 4:3). HDTV is 1.78:1, or 16:9.

A device with several audio and video source inputs that 
sends a selected audio/video source input signal to an output 
device like speakers or a TV.

Projector screen technology that relies on using individually 
controlled tiny mirrors (micro mirrors) to produce an image. 
Developed originally by Texas Instruments.

A standalone unit that resembles and functions very much 
like a VCR. Like a VCR, DVD recorders all have AV source 
inputs, as well it can record TV shows.

The high-resolution form of television. HDTV has 1125 lines 
of resolution, or more than five times the video information 
than that of a TV set, creating a much crisper, more detailed 
picture.

A device that is connected to a set of lights and allows the 
lights to be powered or dimmed remotely.

A single unit that is some combination of the functionality of 
a DVD, VCR, radio, and amplifier.

The standard video broadcast format used in North America.

A device that produces the sound or picture, for example, 
a TV or speakers.

A video format that is used in the UK, and parts of Europe