Method and the device in order to detect the synchronous word of the PPM coded servo pattern reading signal which is grasped from the magnetic tape

摘要

Topic Method and the device in order to detect the L bit synchronization word which occurs at N bit interval tape drive (1) the magnetic tape inside in the PPM coded servo pattern reading signal which is grasped from (3) are offered. Solutions The software output detector (11), processing the aforementioned PPM coded servo pattern reading signal, it forms the consecutive software output sample which corresponds to each bit where the inside of aforementioned servo pattern is encoded. Next, the synchronous word detector (12), block correlation value of each position of sliding L sample block inside the aforementioned consecutive software output sample is formed. The aforementioned block correlation value calculates the bit correlation value which shows the correlation with each sample and the bit to which the aforementioned synchronous word corresponds in each block position, respectively, is formed by totaling the value which pulled the specified function of the software output sample value which corresponds from each bit correlation value respectively. Next, the aforementioned synchronous word detector (12), (N+L 1) of the aforementioned consecutive software output sample synchronous word of the block position to which block correlation value becomes maximum inside the sample sequence is detected. Selective figure Figure 5