| 摘要 |
PURPOSE:To avoid the deterioration of separation due to the change of characteristics in a demodulation circuit or the like, by processing the operation of the 1st and 2nd high frequency signals in the state before the demodulation respectively. CONSTITUTION:An L+R signal S1 on the 1st carrier wave f1 is applied to the 1st input terminal 1 and a 2R signal S2 on the 2nd carrier wave f2 is applied to the 2nd input terminal 2. The signal S2 applied to the 2nd input terminal 2 is applied to a 1/2 frequency-division circuit 16 to be the 3rd high frequency signal S3 the frequency f2 of which is frequency-divided to 1/2, and the signal S3 and the 1st high frequency signal S1 are applied to a multiplication circuit 17, at the output of which the 4th high frequency signal S4 being S1-S3 is obtained. The signals S4 and S3 are applied to the 1st and 2nd FM demodulation circuits 5 and 6 via band pass filters 3 and 4, and they are independently demodulated and the R and L signals are obtained. |
