Hitachi, Ltd.

Shoichi Miyazawa, Deceased

Takashi Nara

Seiichi Mita

Ryutaro Horita

Akihiko Hirano

Kenichi Hase

Takushi Nishiya

Shintaro Suzumura

Tsuguyoshi Hirooka

Hideyuki Yamakawa

Yoichi Uehara

Haruto Katsu

A calculation concerning the input of a signal is removed from a branch metric calculation processing on a trellis diagram of an extended partial response class, and the calculation of branch metrics and the selection of survivor paths can be carried out by the subtraction of the survivor paths and the comparison of constants.

Digital signal decoding apparatus and a decoding method used therein

Digital information including a sync data field and a user data field subsequent thereto is read from a storage media as a digital information signal in an analog signal format. The obtained signal is sampled according to a clock signal and is thereby transformed into a digital information signal in a digital format. In the sync data field, the clock signal is synchronized with the digital information signal by an analog PLL circuit. Thereafter, in the user data field, the clock signal is synchronized with the digital information signal by a digital PLL circuit.

Digital information signal reproducing circuit and digital information

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Yokohama, Japan

Shoichi Miyazawa, Deceased