| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a failure due to a step-out in a very short time by allowing an input signal to acquire internal synchronism fast by making an input synchronizing signal acquire the synchronism with a track synchronizing signal and resetting a track number, when acquisition is fixed. SOLUTION: Image data of one frame are formed as (n) tracks on a magnetic recording medium by making a scan by a rotary head (n) times (n>1). A synchronism control part 1 performs PLL control, based upon the input synchronizing signal (a) as a reference to output the frame synchronizing signal (b) and track synchronizing signal (c) as internal reference signals whose phases are locked thereto, and they are even used as a reference signal for a drum servo. The synchronism control part 1 switches the acquisition mode from a frame mode to a track rise mode in an error generating process and resets the track number to zero, when the acquisition of the track synchronizing signal (c) is fixed.</p> |
