Abstract: If a mode calculating section (52) judges that an inputted modulated signal is nearly in a no-sound state, the interpolation width determined by an interpolation width calculating section (53) is increased, whereas if the mode calculating section (52) judges that the inputted modulated signal contains a lot of high-frequency components, the interpolation width determined by the interpolation width calculating section (53) is decreased.

Abstract: A stereo broadcasting receiving device comprises pseudo stereo signal generation means for generating a pseudo left stereo signal and a pseudo right stereo signal from an L+R signal, first multiplication means for multiplying the pseudo left stereo signal by a first coefficient, second multiplication means for multiplying the pseudo right stereo signal by the first coefficient, third multiplication means for multiplying the L+R signal by a second coefficient, fourth multiplication means for multiplying an L−R signal by a third coefficient, coefficient determination means for determining the first coefficient, the second coefficient, and the third coefficient on the basis of the result of judgment in receiving state judgment means, means for generating a left stereo output signal on the basis of an output signal of the first multiplication means, an output signal of the third multiplication means, and an output signal of the fourth multiplication means, and means for generating a right stereo o