Digital broadcast reception device and digital broadcast reception method

摘要

Disclosed is a digital broadcast reception device that includes a plurality of tuner/demodulator units; a tuning control unit; a current position detection unit for detecting a current position; a channel scan control unit that has one of the plurality of tuner/demodulator units perform tuning for program viewing or listening, and has another one of the plurality of tuner/demodulator units perform a channel scan by tuning to the physical channels sequentially and detecting receivable physical channels; a broadcast area map generation unit for generating broadcast area maps including the receivable physical channels when the channel scan is executed, broadcast service information regarding broadcast content of the physical channels, and receivable position information; and a broadcast area map storage unit for storing the generated broadcast area maps.

主权项

1. A digital broadcast reception device, comprising:
a plurality of tuner/demodulator units for tuning to physical channels and demodulating broadcast signals on the physical channels; a tuning control unit for controlling operation of the plurality of tuner/demodulator units; a current position detection unit for detecting a current position; a channel scan control unit that has one of the plurality of tuner/demodulator units perform tuning for program viewing or listening, and has another one of the plurality of tuner/demodulator units perform a channel scan by tuning to the physical channels sequentially and detecting receivable physical channels; a broadcast area map generation unit for generating or updating broadcast area maps including the receivable physical channels when the channel scan is executed, broadcast service information regarding broadcast content of the physical channels, and information of a receivable area of each of the physical channels; and a broadcast area map storage unit for storing the generated or updated broadcast area maps, wherein each said receivable area is represented as an area inside a polygon defined by vertices arranged in order, and coordinates of said vertices in an orthogonal coordinate system are stored for each said polygon in said broadcast area map storage unit, wherein, when the channel scan indicates that the receivable area of a particular physical channel needs to be expanded, said broadcast area map generation unit updates the receivable area information by adding to the polygon of the receivable area of the particular physical channel a new vertex corresponding to the current position when the channel scan is executed.