| 摘要 |
PURPOSE:To obtain noiseless still picture reproducing by detecting noise that is difficult to be detected with increasing detecting sensitivity according to a noise position, and dealing with the detected noise by identifying whether it is caused by a tape scratch, etc. or not. CONSTITUTION:A reproducing signal which is picked up at heads 6 and 7 and is amplified at an amplifier 9 is envelope-detected at a comparator 13 and generates a signal 30 that is a part to become noise on a reproducing picture. On the other hand, the rotation of magnets 11 and 12 induces voltage on a drum rotating head 15 and is amplified at an amplifier 16 and a signal 36 is generated at a head switching signal generating circuit 17. So that the D input of a D flip flop is high, a signal 32 is generated by signals 30 and 31. The signal 32 is inputted to a driving pulse circuit 29 passing through an AND gate 24, etc. and a signal 38 is obtained and a capstan motor 27 is rotated at low speed in the normal direction. Thereby, the noise on a scope is slowly moved from up to down and the signal 30 is no more detected and the signal 32 is always maintained at a low and the capstan motor stops. Thus, the noiseless reproducing is obtained.
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