Click on a letter to jump to that section of our glossary.
Variable Bit
Rate - When a DVD is played the rate that data flows is not
fixed. Complex, action and other dynamic scenes will result
in higher data rates while still images require a lower data
rate.
VBI - See Vertical Blanking Interval.
V-Chip - A chip
built into televisions that allows certain objectionable
content to be blocked. The chip reads ratings transmitted
with television programming and blacks them out at the level
preset by the TV's owner.
VCR - Videocassette Recorder. A device for the recording of audio and video onto large cassette tapes. VCRs have the ability to record from OTA, cable, satellite, video cameras and other VCRs. While VCRs sales are declining, the industry hopes to revive sales with an HD model capable of recording and playing high-definition programs.
VCR Plus - A
time-shift control system featured in some VCRs to make recording
easier.
Vertical Blanking Interval - The interval of time for the scan to return from the end of one frame back to the beginning of the next frame. This is typically measured in scan lines. The NTSC calls for the VBI to be 40 scan lines.
Vertical Resolution - The number of lines or pixels from the top to the bottom
of the screen. The larger the number, the better the resolution
and the ability to show fine detail. Analog NTSC televisions
can display 480 lines interlaced, DTVs can display from 480
lines progressive up to 1080 interlaced.
VHS - Video Home System. The winner of the VHS - Betamax format war for dominance. The standard prescribed the technical requirements for VCR and video tapes.
VHF - Very
High Frequency. Radio waves that carry the lower numbered
television channels. UHF carries
the higher numbered channels.
