Patent ID: 6813310
Filing Date: 2004-11-02
Classification: H04B,H04H

Abstract:
A receiver for receiving a signal of a broadcast system in which a broadcast wave signal of an analog broadcast and a broadcast wave signal of a digital broadcast are transmitted in respective frequency bands adjacent to each other, the receiver comprising:mixer means to which a received signal and a local oscillation signal are supplied for performing a frequency conversion of the received signal to an intermediate-frequency signal by using the local oscillation signal; filter means for taking out the intermediate-frequency signal from an output signal of said mixer means; and demodulation means for taking out a signal indicating broadcast contents from the intermediate-frequency signal taken out by said filter means, wherein: at a time of receiving the signal of the broadcast wave signal of the analog broadcast and the broadcast wave signal of the digital broadcast, a frequency of the local oscillation signal fed to the mixer means is set to a first frequency lower than a carrier frequency of the received signal by a predetermined increment that is a difference between the carrier frequency and a center frequency of the digital broadcast signal on a frequency side lower than the carrier frequency; and the signal taken out by said demodulation means is a signal indicating broadcast contents of the analog broadcast, and at a time of receiving the broadcast wave signal of the digital broadcast, the frequency of the local oscillation signal is set to a second frequency equal to the carrier frequency of the analog broadcast, so that a direct conversion is performed by said mixer means; and the signal taken out by said demodulation means is a signal indicating broadcast contents of the digital broadcast.