Patent ID: 8321907
Filing Date: 2012-11-27
Classification: H04N

Abstract:
1. A broadcast receiving apparatus, comprising: a receiver which receives a first TV broadcast signal and a second TV broadcast signal; a timesharing unit which timeshares the first TV broadcast signal and the second TV broadcast signal received by the receiver for outputting; a decoder which alternately decodes the first TV broadcast signal and the second TV broadcast signal timeshared by and outputted from the timesharing unit; a detector which detects a decoding error part of the first TV broadcast signal decoded by the decoder with respect to each frame, and generates a decoding error information, with respect to each frame, including error information and a presentation time stamp attached to the frame; a synthesizer which specifies the decoding error part of the first TV broadcast signal based on the error information in the decoding error information generated by the detector, specifies a frame of the second TV broadcast signal of which a time is the same as that of the decoding error part based on the presentation time stamp, and generates a composite signal obtained by replacing the decoding error part of the first TV broadcast signal with a corresponding part in the specified frame of the second TV broadcast signal decoded by the decoder; a first storage device which stores the composite signal outputted from the synthesizer; and a second storage device which stores the second TV broadcast signal decoded by the decoder, wherein the decoder decodes the second TV broadcast signal and the first TV broadcast signal in this order with respect to frames having a presentation time stamp identical to each other, and stores, before the detector detects the decoding error part of the first TV broadcast signal, the part of the second TV broadcast signal corresponding to the decoding error part of the first TV broadcast signal in the second storage device, the decoder reads out, when the detector has detected the decoding error part of the first TV broadcast signal, the decoded second TV broadcast signal, which corresponds to the first TV broadcast signal where the decoding error part has been detected, from the second storage device and uses the readout decoded second TV broadcast signal in decoding a next frame of the first TV broadcast signal, the synthesizer stores the first TV broadcast signal decoded by the decoder in the first storage device if the detector has not detected the decoding error part of the first TV broadcast signal, and reads out the part of the second TV broadcast signal corresponding to the decoding error part from the second storage device and stores the readout part in the first storage device if the detector has detected the decoding error part of the first TV broadcast signal, and wherein the first TV broadcast signal and the second TV broadcast signal are each a digital TV broadcast signal, and the first TV broadcast signal has a content identical to a content of the second TV broadcast signal, and is a signal modulated by a modulation system having a viewable receiving C/N ratio higher than a viewable receiving C/N ratio of a modulation system applied to the second TV broadcast signal.