| 摘要 |
PURPOSE:To obtain two L and R signals without an amplifier, by receiving stereo information of (L+R)/2 and R transmitted on two channels and processing signals through the combination of an adder and a subtractor. CONSTITUTION:In receiving a stereo broadcast, a mode changeover switch 10 is selected as shown in figure, and a signal of (L+R)/2 applied to an input terminal 11 is supplied to a subtractor 8 and an adder 9. An R signal applied to an input terminal 12 is given to the subtractor 8 and a signal of (L-R)/2 is introduced. This signal is summed with the (L+R)/2 at the adder 9 and an L signal is obtained at an output terminal 13. In case of the bilingual broadcast, a signal M1 is applied to the terminal 11, and a signal M2 is to the terminal 12. Since the mode changeover switch 10 is selected to the 10a position, the subtraction by the subtractor 8 is not done, and the signals M1, M2 are outputted as they are at the output terminals 13 and 14. |
