Patent ID: 8103230

Claim:
A broadcast receiving device, characterized by comprising: a tuner part configures to, according to a tuning command, convert a signal in a signal from a signal source, on a frequency band corresponding to said tuning command, to an intermediate frequency signal, which is a signal on an intermediate frequency band whose center frequency is a predetermined frequency; a first filter part configures to, if said predetermined frequency corresponds to a frequency of a carrier wave of an analog radio broadcast according to the amplitude modulation method, take said predetermined frequency as a center frequency, and selects from said intermediate frequency signal and passes through a signal on a first frequency band which is appropriate for reproducing broadcast contents from said analog radio broadcast; a second filter part configures to take said predetermined frequency as a center frequency, and select from said intermediate frequency signal and passes through a signal on a second frequency band whose bandwidth is narrower than said first frequency band; a first detection part configures to detect a first power level, which is the power level of the signal passed through said first filter part; a second detection part configures to detect a second power level, which is the power level of the signal passed through said second filter part; a tuning control part configures to issue said tuning command to said tuner part; and a judgment part configures to, on the basis of said first power level and said second power level obtained corresponding to a tuning command in which a specific channel is designated, and said first power level and said second power level obtained corresponding to a tuning command in which at least one adjacent channel to said specific channel is designated, make a judgment as to whether or not a digital radio broadcast which takes the center frequency of said specific channel as its center frequency is being performed according to an in-band-on-channel method.