Patent ID: 8149935

Claim:
A digital broadcast receiver that receives digital broadcast through which first data and second data are transmitted using Orthogonal Frequency Division Multiplexing (OFDM), comprising a Fast Fourier Transform (FFT) unit performing an FFT process for a received signal to generate a first frequency-domain signal corresponding to the first data and a second frequency-domain signal corresponding to the second data; a detection unit detecting a reception environment; a mode switching unit selecting, in accordance with the reception environment detected by the detection unit, a first reception mode for recovering the first data or a second reception mode for recovering the second data; an extraction unit extracting the first frequency-domain signal from an output signal of the FFT unit in the first reception mode, extracting the second frequency-domain signal from the output signal of the FFT unit in the second reception mode, and extracting the first and second frequency-domain signals from the output signal of the FFT unit when the reception mode is switched; a recovery unit recovering the first data from the first frequency-domain signal extracted by the extraction unit in the first reception mode, recovering the second data from the second frequency-domain signal extracted by the extraction unit in the second reception mode, and recovering the first and second data from the first and second frequency-domain signals extracted by the extraction unit when the reception mode is switched; and an output unit outputting the first data or the second data in accordance with an instruction from the mode switching unit.