| 摘要 |
PURPOSE:To obtain a playback signal with high fidelity by a two-head type helical scanning magnetic recording and reproducing device by generating a signal which has a specific gradient or curvature in a continuous holding period on the basis of a signal right before holding operation is started. CONSTITUTION:An input terminal 11 is connected to one univerted input terminal of an amplifier 21 through a resistance R1 and the connection point between the resistance R1 and amplifier 21 is grounded through a resistance R2. The output terminal of the amplifier 21 is connected to the other inverted input terminal through a resistance R3 and also connected to a capacitor C1 through an analog switch 3. A hold signal Sh which continues for a specific time on the basis of, for example, a head switching signal is inputted to an input terminal 12. Then, the hold signal Sh is inputted to the input terminal 12, and when the analog switch 3 is opened, the capacitor C1 holds the voltage of a playback demodulated signal right before it to develop an output voltage with the specific gradient at an output terminal 13 in the continuation period of the hold signal Sh. |
