| 摘要 |
PURPOSE:To obtain a signal of high picture quality which is not affected by an external induced noise while decreasing the number of rotary transformers by incorporating reproducing amplifiers and a switch circuit in a rotary drum. CONSTITUTION:The rotary magnet 10 of an electric generator 14 fitted to the rotary drum driven by a motor 3 receives magntic flux from a stator magnet 11 to generate an AC signal. This is rectified by a rectifying circuit 18 into a DC current, which is supplied from terminals 20 and 20' as power sources of a regenerative amplifier 6 and the switch circuit 7. Consequently, signals obtained by a video head groups 4(4a-4n) are amplified by a reproducing amplifier group 6 (6a-6n), whose outputs are switched by a switch circuit 7 and led out to a terminal 9' through the rotary transformer 5. Thus, the fine signal is amplified and supplied to the transformer 5, so high picture quality which is not affected by an external noise is obtained and a reproduction output is obtained by one transformer 5 even when plural heads 4 are provided. |
