Patent ID: 7701511

Claim:
A digital television broadcast signal receiver comprising: a closed caption information detection means for detecting whether closed caption information of digital television and/or closed caption information of NTSC (National television System Committee) are/is included in digital television broadcast signal or not; a closed caption information extraction means for extracting the closed caption information of digital television and/or the closed caption information of NTSC, when the closed caption information of digital television and/or the closed caption information of NTSC are/is included in the digital television broadcast signal; a display means for displaying an image of TV program; a first annunciation image output control means for displaying a first annunciation image for announcing a fact that the closed caption information of digital television is detected with superimposing on the image of TV program, when the closed caption information of digital television is detected with the closed caption information extraction means; a second annunciation image output control means for displaying a second annunciation image for announcing a fact that the closed caption information of NTSC is detected with superimposing on the image of TV program, when the closed caption information of NTSC is detected with the closed caption information extraction means; and wherein: the closed caption information of digital television extracted with the closed caption information extraction means is outputted with superimposing on the image of television program to the monitor display apparatus when the first annunciation image is outputted; the closed caption information of NTSC extracted with the closed caption information extraction means is outputted with superimposing on the image of television program to the monitor display apparatus when the first annunciation image is not outputted but only the second annunciation image is outputted; when the closed caption information of digital television and/or the closed caption information of NTSC are/is not detected which have/has been detected with the closed caption information detection means, the first annunciation image output control means and the second annunciation image output control means maintain the output of the first annunciation image and/or the second annunciation image until a predetermined term passes from a time when the closed caption information of digital television and/or the closed caption information of NTSC are/is not detected; and when a state that the closed caption information of digital television and/or the closed caption information of NTSC are/is not detected is continued in the predetermined term, the first annunciation image output control means and the second annunciation image output control means stop to output the first annunciation image and/or the second annunciation image.