A high-speed music search is one of the most important features of the R-DAT (Rotary-Head Digital Audio Tape Recorder). This paper describes some methods for the "high speed music search," and particularly describes the drum servo control system controlled by a pilot signal recorded in the ATF (Automatic Track Following) area. This technology realizes high performance in that the error of the relative velocity between the rotary head an the tape is less than 5% under a tape speed of 1-200 times as fast as normal tape speed. Additionally we developed a one-chip Digital Servo LSI which performs the above-mentioned functions for each rotation of the drum, capstan, and reels.
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