frame

In all television standards, the television picture is interlaced to reduce flicker. In the full- frame process, two fields are generated: one consisting only of the odd lines and a second consisting only of even lines. These partial images are called fields. Two of these fields add up to a full picture, a television picture with all lines, the even and the odd.

In the PAL television standard, the fields operate at a frame rate of 50 Hz, so the full picture has 25 Hz.