| 摘要 |
PURPOSE:To automatically adjust a recording characteristics by a simple constitution, by controlling a recording signal and a reproducing signal by a circuit containing a counting means. CONSTITUTION:Two frequencies f1, f2 are used as signals for adjusting a recording characteristics, they are applied to a gate circuit 1 and a signal which intermits periodically is generated, it is recorded into a tape 11 by a head 10 through a level variable means 6 and a recording characteristic variable means 7, simultaneously a reproducing signal is taken out from a head 12, it is compared with a reference level by a comparator 17, and a signal is outputted. On the other hand, a counter 4 is provided, the number of times of generation of a reproducing output is counted and in accordance with said counting the level variable means 6 is controlled, and also its counting operation is stopped by the compared output. Accordingly, when adjusting a level, only f1 is recored EQ, and when adjusting a recording bias, f1 and f2 are superposed and used, by which a recording characteristics are adjusted automatically by a simple constitution. |
