| 摘要 |
THE INVENTION RELATES TO A METHOD AND AN ARRANGEMENT FOR A DIGITAL SERVO SYSTEM WITH PRE-PROCESSING OLD CONTROL STATES TO SHORTEN PROCESSING DELAY, WHICH IMPROVES THE STABILITY OF THE CONTROL LOOP AND/OR ALLOW A FAST SERVO SIGNAL PROCESSING, WHICH IMPROVE THE OVERALL SERVO CONTROL PERFORMANCE. THE DIGITAL SIGNAL PROCESSOR OF THE SERVO SYSTEM STORES PREVIOUSLY CALCULATED CONTROL FILTER STATES (ISA, DSA, DSB) FOR A CALCULATION OF A DIGITAL SIGNAL PROCESSOR OUTPUT VALUE (YE(N) FROM A CURRENT INPUT VALUE (XE(N)) AND PROVIDES THE DIGITAL SIGNAL PROCESSOR OUTPUT VALUE (YE(N)) BEFORE CALCULATING CONTROL FILTER STATES (ISA, DSA, DSB) BASED ON SAID CURRENT INPUT VALUE (XE(N)). THE INVENTION IS E.G. APPLICABLE FOR A FAST DIGITAL SERVO SYSTEM IN AN OPTICAL DISC DRIVE.FIG. 7
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