| 摘要 |
PURPOSE:To prevent missing of a demodulated audio signal and to eliminate the distortion at stereo demodulation by applying timing control to a non-inverting and an inverting switching signal obtained at an output side of a level converting circuit. CONSTITUTION:The non-inverting and the inverting switching signals SL and SR obtained at the output side of the level converting circuit 5 are applied to the timing control circuit 8 and the non-inverting and the inverting switching signal obtained at the output side of a control circuit 8 are applied to a switch driving circuit 6 so as to drive analog switching circuits 3L,3R demodulating left and right signals. Thus, even if there is a variation in the threshold voltage of the converting circuit 5 itself and the timing where the middle level between the non-inverting and inverting switching signals SL and SR is, e.g., 0V is shifted, this shift is matched by the control circuit 8 and no missing is produced in the demodulated audio signal. |
