Kabushiki Kaisha Toshiba

Nobumasa Naito

Kazuo Watabe

Yuji Nagai

Akihito Ogawa

Chosaku Noda

Hisashi Yamada

Naomasa Nakamura

Naoki Morishita

Kazuto Kuroda

Toshihiko Kaneshige

Nobuhisa Yoshida

Hideaki Ohsawa

Hiroharu Sato

According to one embodiment, a first encoder encodes main information, a second encoder encodes sub-information, a first modulator modulates a carrier based on an output of the first encoder, a duplicating module duplicates an output of the second encoder to generate encoded sub-information units, and a second modulator amplitude-modulates an output of the first modulator based on the encoded sub-information units. The second modulator amplitude-modulates with &#x3c3;/(&#x3bc;&#xd7;(2)) being 0.4 or less, wherein a noise power of a transmission path or a storage medium is &#x3c3;, a number of the encoded sub-information units is N, signal levels after amplitude modulation, which correspond to bitand bitof the encoded sub-information units, are A and B, and a level difference A&#x2212;B is &#x3bc;.

Signal processing system and information storage medium

Growing community of inventors

Ome, Japan

Nobumasa Naito