A video signal processing apparatus comprises a sub-screen processing integrated
circuit for subjecting a sub-screen video signal to scale-down processing to reduce
its display region and output the sub-screen video signal, and a main-screen processing
integrated circuit comprising: a switching circuit for receiving a main-screen
video signal and the scaled-down sub-screen video signal which is outputted from
the sub-screen processing integrated circuit, and selecting the main-screen video
signal for a main-screen display region while selecting the sub-screen video signal
for a sub-screen display region; an A/D conversion circuit for converting the video
signal outputted from the switching circuit into a digital video signal; a digital
signal processing circuit for digitally processing the digital video signal outputted
from the A/D conversion circuit; and a D/A conversion circuit for converting the
digitally-processed video signal into an analog video signal. Therefore, the main-screen
video signal and the sub-screen video signal can be combined so that these signals
are displayed on a single screen, and the circuit scale of the video signal processing
apparatus can be minimized.
