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Receiving apparatus and receiving method
| Details |
Inventors: Hayashi, Toshihide; Morisawa, Akiko;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Kostak; Victor R.
Assistant Examiner:
Attorney, Agent or Firm: Maioli; Jay H.
A receiving apparatus including first and second tuners for receiving telecast signals and demodulating the signals of predetermined channels; a decoder for extracting the character broadcast data from either of the demodulated signals and decoding the extracted data; a selector switch for selecting either of the signals obtained from the first and second tuners and supplying the selected signal to the decoder; a controller for controlling the selector switch during its selection of the output signal from the second tuner in such a manner as to force the switch to periodically select the demodulated signal outputted from the first tuner; and a detector for detecting whether the character broadcast data extracted by the decoder represent a caption or not when the switch has selected the output signal from the first tuner; wherein, if the result of the detection by the detector signifies that the character broadcast data represent a caption, the controller forces the switch to select the output signal from the first tuner. In this apparatus, when any caption broadcast is started by teletext, priority display of the caption can be realized without enlarging the apparatus structure or raising the production cost thereof. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide an improvement without enlarging the structure of the apparatus or raising the production cost thereof, wherein a detection is performed as to whether a caption is currently broadcast or not on the channel being received and, if the result of the detection signifies the presence of any caption being broadcast, such caption is displayed with priority.
According to one aspect of the present invention, there is provided a receiving apparatus which includes a first and a second receiving circuit for receiving telecast signals, then demodulating the signals of predetermined channels and outputting the demodulated signals; a decoder circuit for extracting the character broadcast data from either of the demodulated signals outputted from the first and second receiving circuit, and decoding the extracted data; an output circuit for delivering one of the outputs of the first and second receiving circuit and the decoder circuit, or combining arbitrary two of said outputs and then delivering the combined output; a selector circuit for selecting either of the signals outputted from the first and second receiving circuit, and supplying the selected signal to the decoder circuit; a control circuit for controlling the selector circuit during its selection of the demodulated signal outputted from the second receiving circuit, in such a manner as to force the selector circuit to periodically select the demodulated signal outputted from the first receiving circuit; and a detector circuit for detecting whether the character broadcast data extracted by the decoder circuit represent a caption or not when the selector circuit has selected the demodulated signal outputted from the first receiving circuit; wherein, when the result of the detection by the detector circuit signifies that the character broadcast data represent a caption, the control circuit forces the selector circuit to select the demodulated signal outputted from the first receiving circuit
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