| 摘要 |
PURPOSE:To reduce crosstalk components, by multiplying the rectangular wave signals which contain a DC component set to a stereo composite signal and are synchronized with the subcarrier frequency. CONSTITUTION:A stereo composite signal Ei is applied to the operational amplifiers OP1 and OP2, and at the same time a clock signal of 38kHz is applied to the analog switches S2 and S3. At the same time, the clock signal is applied to the analog switches S1 and S4 through an NOT circuit. The gains of the amplifiers OP1 and OP2 vary in accordance with the switches S1-S4 which are turned on and off by the clock signal. Thus an output is obtained by multiplying the signal Ei by the subcarrier frequency. A high band component of the above-mentioned output is removed through a low pass filter, and the L and R components free from the crosstalk are obtained. |
