Chroma circuit

Abstract

Abstract PURPOSE: To improve the color resolution and color transient characteristics, by sharing each primary color, on the assumption that the ratio of the low frequency component for chrominance signal and luminance signal is established for high frequency component, when no transient phenomenon is caused to the low frequency component of luminance signal. CONSTITUTION: The chrominance component signal not including the high frequency component inputted to the input terminals 1R, 1G and 1B is added to the division circuits 7R∼7B, the luminance signal at the input terminal 1Y is divided by the low frequency luminance signal inputted via the LPF4, the output of the circuits 7R∼7B is fed to the multiplication circuits 8R∼8B, where it is multiplied with the high frequency luminance signal inputted via HPF5. Further, at the addition circuits 9R∼9B, it is added with the output of the addition circuits 6R to 6B adding the chrominance component with the luminace signal component. Further, the chrominance component adding high frequency component to the output of the circuits 9R∼9B is outputted to improve the color resolution and color transient phenomenon more than the limit of NTSC system. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Kunio Ando
• 👤 Hiroaki Nabeyama
• 👤 Gentaro Miyazaki
• 👤 Masanori Ogino
• 👤 Masaru Noda
• 👤 Masutomi Oota
• 👤 Tomomitsu Azeyanagi

Bibliographic Details