A Y/C separation circuit according to the present invention includes: a
pattern determination section in which video signals "a", "b", and "c" of
three lines from which a frequency band of a chrominance subcarrier is
extracted through BPFs to determine whether an addition/subtraction
result of (b-a), (b+a), (b-c), (b+c), (c-a), and (c+a) is positive or
negative, thereby determining relations in amplitude and phase between
the video signals "a", "b", and "c"; and a filtering section in which one
of plural filtering operations for separating a chrominance signal is
selected in accordance with the determination result sent from the
pattern determination section to output a chrominance signal through the
selected filtering operation.