Abstract: A composite video signal is separated into a luminance signal and a color signal according to spectrum distributions thereof.

Abstract: A multi-level drafting table construction including a table base supporting a drafting board, and an arrangement of link members pivotally interconnecting the drafting board and table base. One of the link members, which is pivotally interconnected at one end to the drafting board, has its other end selectively receivable in ratchet teeth provided on the table base for adjusting inclination of the drafting board in multi-level positions of the board. A front link member is pivotally connected at one end to the table base at a first pivot axis which is a common axis for inclination of the drafting board about said axis for inclination of the board in a first range of inclined positions. The front link member is pivotally connected at its other end at a second pivot axis to the drafting board to provide pivotal movement of the drafting board about said pivot axis in a different range of inclined positions and at different levels.