V-chip technology blocks selected content and derives its name from the violence chip. Intended for parental control on the types of television children can watch. The chip reads transmitted ratings from television programs and blacks them out at the level set by the television owner. V-Chip is required on all televisions manufacturer for the U.S. market that are greater than 13 inches.

Variable Bit Rate. Refers to a variable data rate for encoding MPEG where picture quality is maintained but data rates change in accordance to the requirements of a video passage. Large amounts of movement and detail require higher data rates. VBR tends to create more space efficient MPEG files where picture quality is maintained but data rates change.

Video Cassette Recorder.

A VCR feature where a user inputs a code, usually published beside a TV listing, into the VCR which tells it how long a program is, what channel it’s on and what time it starts in order to record it.

An image artifact that can appear on LCD projectors due to variations in manufacturing. Usually occurs in picture mid-grays.

Period of time that the electron beam of a CRT is turned of to reposition itself from the bottom right of the screen to the top left after painting a field or frame.

VGA is a display resolution measuring 640 horizontal pixels and 480 vertical pixels giving a total display resolution of 307,200 individual pixels. VGA has a 4:3 aspect ratio.

Vertical Helical Scan. Also known as Video Home System and is the most common consumer videotape format. It is a ½” magnetic tape format introduced in 1976 by JVC. Offers about 240 vertical lines of resolution.

A measurement of electrical pressure.�