VTR用ソフトウェアサーボシステムの開発(<論文特集>画像情報記録技術)

概要

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This paper describes a software servo system for a VCR. We developed a software servo microcomputer called the M37770M4A to improve servo performance. It has a 16-bit CPU, a timing-measurement-timer with a 16 MHz clock that is reset by a drum PG (Pulse Generator) signal, a 14-bit PWM and so on. The M37770M4A can make the programming of outputting pulses easy and can reduce quantize noise. We applied this microcomputer to a camcorder and adapted a disturbance observer to the drum/capstan servo system to suppress fluctuations in the motors' rotations at low frequencies. Moreover, inserting a digital filter into the observer to compensate for the LPF characteristic reduced the increase in rotational fluctuation at high frequencies caused by model mismatching of observer.
社団法人映像情報メディア学会の論文
1992-10-20