| 摘要 |
PURPOSE:To execute reproducing without containing noise components in a sound FM signal by constituting a titled circuit so that it does not select an output of the other band pass filter which does not correspond to a band of an output of an auxiliary head at the time of reproducing at a double speed. CONSTITUTION:Each output of a beta1 auxiliary head 5 and beta2 auxiliary head 6 is selected by main and auxiliary changeover switches 3,4 by applying a double speed reproducing pulse FP, and a head switching pulse SWP is selected by a switch 22, by which a time division switch 20 is set to a time division switching operation mode. Main- and sub-signal carrier waves LB, RB from the auxiliary heads 5, 6 are selected in time division, led out as continuous signals to band pass filters 17, 16 for A channel carrier waves RB, LB, and a main signal and a sub-signal are extracted, and led out as a sub-signal and a main signal to demodulators 27, 28 through time division switches 25, 26, respectively. Said signals do not pass through band pass filters 10, 11 for A channel carrier waves RA, LA, therefore, they contain no noise component. |
