| 摘要 |
PURPOSE: A digital broadcast transmission method is provided to efficiently transmit and receive a caption in transmission environment based on an open cable and the cable ready standard. CONSTITUTION: An MPEG-2(Moving Pictures Experts Group-2) transport stream is demultiplexed to a video, an audio, and control information through an MPEG demultiplexer(501). A PMT(Program Map Table) and an EIT(Event Information Table) of a PSIP(Program and System Information Protocol), which is included in the control information, are stored in a PMT buffer(502) and an EIT buffer(503). A user processor(504) searches caption data included in digital cable broadcast based on kinds of a caption service set by a user through caption_service_descriptor information stored in the PMT buffer or the EIT buffer. [Reference numerals] (502) PMT buffer; (503) EIT buffer; (504) User processor; (505) Video parser; (506) Analog CC decoder; (507) DTVCC decoder; (508) MPEG-2 video decoder; (509) Video synthesizer; (510) User graphic unit; (511) Video reconstruction device;
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