crt display screen has a horizontal length a and a vertical length b the symbols c and e designate the vertical length of the first display part p 1 and the horizontal length of the second display part p 2 respectively the symbols d and f designate the width of the guard band portions fig2 is a block circuit diagram of the preferred embodiment of the television receiver of the present invention referring to fig2 a tuner 10 generates baseband outputs 10v and 10a which are a composite video signal and an audio signal respectively external input signals 11 12 and 13 include opposite video signals 11v 12v 13v and video signals 11a 12a 13a respectively in this case these audio signals are commonly applied in the form of decoded two channel stereo signals therefore an output signal 15a of an audio input signal selector switch 15 is a one channel signal when the audio signal 10a is selected by the switch 15 in other cases one of the two channel stereo signals 11a 12a and 13a is selected by the switch 15 however the one channel signal 15a only is shown in fig2 so as to simplify the illustration another selector switch 14 selects one of the composite video signals.