Patent ID: 6788747
Filing Date: 2004-09-07
Classification: H04B,H04H,H04N

Abstract:
A receiver for receiving an analog broadcast and a digital broadcast, comprising:a mixer circuit for performing frequency conversion of a received signal to an intermediate frequency signal by means of a local oscillation signal; a filter circuit for taking out the intermediate frequency signal from an output signal of said mixer circuit; a first circuit for taking out a DC offset voltage of said intermediate frequency signal from said intermediate frequency signal at the time of receiving said digital broadcast; a second circuit for correcting the DC offset of said intermediate frequency signal by using the taken out DC offset voltage; and, a demodulation circuit for taking out a signal indicating broadcast contents in one of the analog broadcast and the digital broadcast from the intermediate frequency signal taken out by said filter circuit, wherein: a frequency of the local oscillation signal is separated from a carrier frequency of the received signal by an intermediate frequency of the intermediate frequency signal and said demodulation circuit takes out the signal indicating broadcast contents in the analog broadcast from the intermediate frequency signal, at a time of receiving the analog broadcast; and the frequency of the local oscillation signal is equal to a center frequency of the received signal and said demodulation circuit takes out the signal indicating broadcast contents in the digital broadcast from the intermediate frequency signal at a time of receiving the digital broadcast.