Color-bar signal generation unit compatible with plurality of television signal formats

Abstract

A color-bar signal generation unit compatible with a plurality of television signal formats is provided. The color-bar signal generation unit in accordance with the present invention includes first, second, and third color-bar signal generators for generating a color-bar signal that represents a 16:9 aspect ratio color-bar test pattern, and a color-bar signal switch for switching outputs of the generators. The color-bar signal is structured to contain a 75% color-bar signal and 100% color-bar signals. The 75% color-bar signal represents a portion of the color-bar test pattern defined with an aspect ratio of 4:3 and serves as an NTSC color-bar signal. The 100% color-bar signals represent portions of the color-bar test pattern outside the portion with the aspect ratio of 4:3 and serve as components of an HD color-bar signal. Consequently, the color-bar signal can be used in common for the HD format stipulating the aspect ratio of 16:9 and the NTSC format stipulating the aspect ratio of 4:3.

Dependencies are inferred from the claim text.