base correction reduces deterioration of picture quality when transmitting or copying playback signals.

Threading

 

See “Loading.”

 

Timecode

 

A digitally encoded signal which is

 

recorded with video data to identify

 

each frame of the video by hour,

 

minute, second and frame number.

 

SMPTE time code is applied to

 

NTSC system, and EBU time code to

 

PAL and SECAM systems.

 

Unloading

 

When the EJECT button is pressed,

 

the VCR automatically winds the

 

tape back into the cassette case. Also

 

called “Unthreading.”

 

User bit data

 

A total of 32 bits are provided in the

 

time code which the user can use to

 

record such information as date, reel

 

number, or scene number on video

 

tape or disc. Also called user’s bits.

 

VBID (Video Blanking ID)

 

This is a video ID signal, defined in

 

the EIAJ CPR-1204 standard, which

 

is inserted into VBS video output to

 

enable the aspect ratio to be detected.

 

The ID signal is inserted into line 20,

 

VBI 283.

Appendix

 

Glossary 105