Patent ID: 7984464
Filing Date: 2011-07-19
Classification: H04N

Abstract:
1. A digital broadcast receiving apparatus, comprising: a scanning unit which scans a broadcast data of one or more sub channels included in a broadcast data of a physical channel in a digital broadcast wave; a channel information memory unit which stores the physical channel, a virtual channel, the sub channels, and scrambling information which indicates whether the sub channels are scrambled or not so as to refer the scrambling information to the sub channels; a scrambling judgment unit which judges whether the broadcast data of the sub channels, which is scanned by the scanning unit is scrambled or not; a memory control unit which stores a judgment result obtained by the scrambling judgment unit in the channel information memory unit as the scrambling information; and an updating unit which updates the scrambling information in the channel information memory unit by executing the scanning unit, the scrambling judgment unit, and the memory control unit at a predetermined timing; wherein: when the judgment result obtained by the scrambling judgment unit indicates that all of the sub channels in the physical channel are scrambled, the memory control unit stores information that the physical channel is a channel which needs to be scanned when the scrambling information is updated by the updating unit; the updating unit makes the scanning unit scan only the physical channel which has a not-scrambled sub channel stored in the channel information memory unit at the predetermined timing; and when the judgment result obtained by the scrambling judgment unit indicates that all of the sub channels in the physical channel are scrambled, the memory control unit stores information that the sub channels are not scrambled as the scrambling information of a predetermined sub channel of the physical channel.