A decoder, for closed-caption broadcast, which receives an input image signal of television broadcast, samples a closed-caption signal for closed-caption broadcast and mixes the closed-caption signal with the image signal, said decoder comprising:
- (a) a closed-caption signal demodulating unit for demodulating a closed-caption signal in an image signal of television broadcast and for outputting the demodulated closed-caption signal for closed-caption display, said closed-caption signal demodulating unit including
- (i) an existence-of-closed-caption-signal discriminator for discriminating whether or not a closed-caption signal exists, for closed-caption broadcast, in an image signal of television broadcast,
- (ii) a first memory for outputting a predetermined simple existence of closed caption character in response to said existence-of-closed-caption-signal discriminator judging that the closed-caption signal exists, and
- (iii) an output circuit for receiving the simple existence of closed-caption character output from said first memory and for converting the simple existence of closed-caption character into a closed-caption signal;
- and
- (b) a mixer for mixing the closed-caption signal, which is output from said output circuit, with the image signal and for outputting the composite signal as a screen display signal, for subsequent output to an external television receiver.