| 摘要 |
<p>PURPOSE:To make it difficult to receive the influence of phase control on the rotating speed of a cylinder motor and to prevent the rolling of a reproduced picture at the time of operating slowly, by making a phase error into 0 and simultaneously changing the characteristics of the low-pass compensating filter of a phase system when the speed control output of the cylinder motor at the time of the slow action is corrected. CONSTITUTION:The title device is equipped with a speed control means 8 to control the rotating speed of a cylinder motor 3 so that the rotating speed can be constant, a reference phase signal generating means 9 to generate a reference phase signal to be the reference of the rotational phase of the cylinder motor 3, a digital filter 12 to low-pass-compensate the output of a phase control means 10, etc. When the speed control output of the cylinder motor 3 at the time of the slow action is corrected, it is made difficult to receive the influence of the phase control by changing the characteristics of the low-pass compensating filter 12 of the phase system and changing the phase of the reference phase signal so that the phase difference between the rotational phase of the cylinder motor 3 and its reference phase can be 0. Thus, the rolling of the reproduced picture at the time of operating slowly can be corrected without the occurrence of color dislocation in the reproduced picture.</p> |
