In a de-emphasis circuit designing method for minimizing the number of
peripheral components of a video signal processing integrated circuit
(IC), a circuit device for determining the level of a reproduced video
signal of the de-emphasis circuit is included in the video signal
processing IC. The number of components is reduced by designing all
circuit elements of the circuit device for determining the level of the
reproduced video signal of the de-emphasis circuit so that they are
incorporated into the video signal processing IC at the time of design of
the video signal processing IC, thereby reducing cost and reducing any
deviation in the playback (PB) level due to external component deviation.
The video signal processing IC comprises the de-emphasis circuit and a
video level setting unit, the latter comprising an amplifier connected to
an output of the de-emphasis circuit, a plurality of resistance elements,
and a plurality of respective switches for ON/OFF switching of the
resistance elements, thereby setting the gain of the amplifier and the
level of the reproduced video signal.