Hitachi, Ltd.

Hitachi Global Storage Technologies Japan, Ltd.

Yukie Miyazawa, Legal Representative

Motoyasu Tsunoda

Hitoshi Ogawa

Ryutaro Horita

Takashi Nara

Katsumi Yamamoto

Masatoshi Nishina

A signal processing device having a feature of analog-to-digital converting a burst signal has a feature of selecting data bus to notify a disk control deviceof a conversion result via an NRZ data bus. The disk control deviceincludes means for storing the result of the analog-to-digital conversion of said servo positional signal. The positional signal of a head of the disk device is digitalized in an R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.

Disk device and method of generating signal representing head

A signal processing device for analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitized in a R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.

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Yokohama, Japan

Yukie Miyazawa, Legal Representative