Patent ID: 8291464
Filing Date: 2012-10-16
Classification: H04H,H04N

Abstract:
1. A digital broadcast receiving apparatus comprising: means for dividing a transmission bandwidth of one channel into a plurality of segments; a bandwidth divider for receiving a plurality of digital broadcast signals which are simultaneously transmitted on a layer including one or more of the segments; broadcasting format retention means for associating with data on a broadcasting format, for each layer, of each broadcast station per channel and retaining it; switching means for getting the data on the broadcasting format, for each layer, which corresponds to a selected channel with reference to the data on the broadcasting format, for each layer, of each broadcast station retained by the broadcasting format retention means, and demodulating the digital broadcast signal received by using the gotten data on the broadcasting format, for each layer, into data for decoding; decoding means for decoding the demodulated data for decoding into image data and sound data; field strength detection means for detecting a field strength of the received digital broadcast signal; reproduction condition detection means for detecting a number of block noises of the layer from the decoded image data; and layer decision means for comparing a size of evaluation value, for each layer, by using an evaluation measure including the detected electric field and the number of block noises as elements of the evaluation measure and determining a layer having a larger evaluation value, wherein the evaluation value is calculated by multiplying the detected number of block noises by a first weighting conversion factor (α), multiplying the differential field strength by a second weighting conversion factor (β), and adding these two multiplied values, wherein the first and second weighting conversion factors respectively establish importance of image quality and field strength in the evaluation, and wherein the differential field strength is calculated by subtracting a reference field strength from the detected field strength.