| 摘要 |
PURPOSE:To improve the reliability of the VTR system by latching an output clock of a PLL circuit generating a clock synchronously with a reproduction data. CONSTITUTION:A signal recorded on a magnetic tape 1 is reproduced by a magnetic head 2, the frequency characteristic of a tape head system is corrected by a reproduction equalizing circuit 3 and a binary signal A is obtained. A pulse B having a pulse width corresponding to a half the pulse interval of the reproduction data is generated by a pulse generating circuit 4 at the leading and trailing of the signal A. When the clock C generated from a PLL circuit 11 is latched by the pulse B, the latch output is processed according to the request of the entire system of the digital VTR and used for alarm information or the like. Thus, a fault location when a fault takes place is limited, quickly and the operation with high reliability is attained. |
