| 摘要 |
PURPOSE:To expand a dynamic range, by reducing a recording bias quantity and a recording equalized quantity in accordance with a level of a high component of a recording signal, when automatically adjusting a recording bias and an equalizer in accordance with a kind of a tape. CONSTITUTION:When a recording operation is executed in a state that a tape has been installed and changeover switches 6a, 6b have been switched to the side (a), a microcomputer 1 executes autotuning so that a recording bias quantity and a recording equalizer quantity, etc. become an optimum value in accordance with an input of a tape selector. Subsequently, when the changeover switches 6a, 6b are switched to the side (b) before recording an input signal, the microcomputer 1 is switched to a dynamic control operation by the changeover switch 6b, a high band component of the input signal is detected by a high-pass filter 5, is A/D-converted 2, and by the microcomputer 1, a control signal is applied to a bias controlling circuit 3 and an equalizer controlling circuit 4, and said quantity is varied in the direction decreasing from a reference value. |
