| 摘要 |
PURPOSE:To constitute a noise reducing device which can act as a 3-head device by using a 2-head device so as to omit a noise reducing device change-over switch, by performing the switching operation between the noise reducing section of the 1st noise reducing integrated device and 2nd noise reducing device by means of commands inputted from a change-over controlling command input terminal. CONSTITUTION:The output signal of a reproducing signal amplifier circuit 2 is also supplied to the 2nd noise reduing device 14 and noise reduction is performed at the device 14 and, after the noise reduction, the output signal is outputted from the output terminal of the device 14. This output signal is designated as the 2nd output signal. The 1st and 2nd output signals are respectively inputted in the 1st and 2nd input terminals 4 and 5 of the 1st noise reducing integrated device 3 and, between the 1st and 2nd output signals, change-over of output signals as the whole noise reducing device is performed at a switching circuit 6 by means of a control signal inputted from a change-over controlling command input terminal 7. |
