| 摘要 |
PURPOSE:To simplify the circuit constitution, by providing a delay time requested to a main signal only to a low pass filter, at the modulation of a stereo signal. CONSTITUTION:Two independent audio signals are given to a stereo matrix circuit 4, the main signal from the circuit 4 passes through a low pass filter 11 whose delay time characteric is set to have a prescribed time difference with a band pass filter 8 passing through a sub-channel signal, and applied to a mixing circuit 10 to which the sub-channel signal is applied. Thus, the disturbance of a higher harmonic of the main signal on the sub-signal is prevented and the deterioration in the separation produced by the shift in delay time is avoided, allowing to simplify the circuit. |
