Device for separating carrier chrominance signal from luminance signal

Abstract

Abstract PURPOSE:To prevent a separated signal from deterioration even if the correlation of a picture is reduced by adding a delay unit and two coefficient multiplier to a conventional separating device and also providing the titled device with a detector for detecting the correlation of input signals and a coefficient controller for the coefficient multiplier. CONSTITUTION:The outputs of an 1-H delay unit 3 and a delay unit 28 are multiplied by K1 and K2 times respectively by coefficient multiplier 29, 30. The correlation detector 31 calculates the degree of the correlation of pictures and outputs a signal corresponding to the correlated degree and the coefficient controller 32 controls said factors K1, K2 on the basis of said outputs. In this case, K1=1-K and K2=K (0<=K<=0.5) are formed and the K value approaches 0.5 in accordance with the increase of the correlation and approaches ''0'' in accordance with the reduction. Since the K1 approaches ''1'' and the K2 approaches ''0'' at the reduction of the correlation, the output of a subtractor 4 approaches the output of the delay unit 28. Thus, the frequency characteristics of a comb filter constituted of the delay unit 3, etc. are changed according to the degree of relation of the picture, so that a luminance signal and a chrominance signal which are reduced at their deterioration are obtained.

Inventors

• 👤 Akifumi Ide
• 👤 井手　章文
• 👤 Chojuro Yamamitsu
• 👤 山光　長寿郎
• 👤 Yoshihisa Nishikiori
• 👤 義久 錦織

Bibliographic Details