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Digital broadcast receiver and information updating method therefor

  • US 9,584,857 B2
  • Filed: 03/24/2014
  • Issued: 02/28/2017
  • Est. Priority Date: 04/10/2013
  • Status: Active Grant
First Claim
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1. A digital broadcast receiver comprising:

  • a receiver that receives a broadcast signal of a physical channel in digital broadcasting;

    a current position detector that detects a current position;

    a current region determiner that determines, as a current region, a region to which the current position detected by the current position detector belongs and which is specified by at least one parameter indicating a position and a shape of the region;

    a receivability determiner that controls the receiver to determine whether the broadcast signal of the physical channel can be received;

    an area information storage unit that stores receivable area information indicating a receivable area where the broadcast signal of the physical channel can be received; and

    an area information updating unit that, when the receivability determiner determines that the broadcast signal of the physical channel can be received, obtains, out of the receivable area information stored in the area information storage unit, receivable area information for the current region indicating a receivable area in the current region determined by the current region determiner, and performs an update process to update the receivable area information for the current region on a basis of the current position detected by the current position detector,wherein the area information storage unit includes;

    a first storage area that stores the receivable area information;

    a second storage area that stores receivable area information corresponding to a partial region out of the receivable area information stored in the first storage area; and

    a region information storage area that stores region information indicating the region corresponding to the receivable area information stored in the second storage area, andwherein the area information storage unit;

    when receiving a request for receivable area information corresponding to a region included in the region indicated by the region information stored in the region information storage area, provides a source of the request with the receivable area information that is stored in the second storage area and corresponds to the region for which the request is made;

    when receiving a request to update receivable area information corresponding to a region included in the region indicated by the region information stored in the region information storage area, stores, in the second storage area, updated receivable area information corresponding to the region for which the request is made; and

    when receiving a request for receivable area information corresponding to a region outside the region indicated by the region information stored in the region information storage area, applies the receivable area information stored in the second storage area to the receivable area information stored in the first storage area, and then stores in the second storage area and provides to a source of the request the receivable area information that is stored in the first storage area and corresponds to the region for which the request is made.

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