公开(公告)号：US10783923B2

公开(公告)日：2020-09-22

申请号：US16293735

申请日：2019-03-06

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Tsuyoshi Nakasendo ,  Yasumori Hino ,  Kohei Nakata

IPC: G11C29/00 ,  G11B20/18 ,  H04L1/00

Abstract: A data coding device includes an error correction coder that converts user data into ECC data by error correction coding, a modulation coder that converts the ECC data into a series of modulated code data, a detector that detects a local concentration of modulation marks/modulation spaces that are shorter than or equal to a prescribed minimum run-length plus N from the series of modulated code data, a conversion determiner that judges whether to convert the series of modulated code data into another series of modulated code data, according to a concentration, detected by the detector, of the modulation marks/modulation spaces, and a modulation data converter that converts the series of modulated code data into the another series of modulated code data.

公开(公告)号：US11335372B2

公开(公告)日：2022-05-17

申请号：US17360256

申请日：2021-06-28

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Tsuyoshi Nakasendo ,  Yoshiaki Komma

IPC: G11B7/135 ,  G11B7/1374 ,  G11B7/09 ,  G11B7/127

Abstract: An optical disk reproducing device includes a division element that divides a reflected light reflected and diffracted by an optical disk into a light flux in a central region and light fluxes in end regions; a photodetector that has a central light receiver that receives the light flux in the central region and at least two end light receivers that receive the light fluxes in the end regions, and outputs a light amount signal corresponding to a light amount of each of the received light fluxes; a non-linear processor that receives each of the light amount signals from the central light receiver and the end light receivers, and outputs linear signals and non-linear signals obtained by processing the light amount signals by linear and non-linear arithmetic operations; an equalization processor that receives the linear signals and the non-linear signals and outputs signals each amplified with a predetermined gain; an adder that adds the amplified signals and outputs an equalization signal; a reproduction signal processor that processes the equalization signal and outputs a reproduction signal and an equalization error signal; and a gain controller that receives the equalization error signal and controls an amplification gain of the non-linear signals.

公开(公告)号：US10453490B2

公开(公告)日：2019-10-22

申请号：US16223698

申请日：2018-12-18

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kohei Nakata ,  Tsuyoshi Nakasendo

IPC: G11B20/10 ,  G11B7/0045

Abstract: An optical disc device includes a first error correction coding circuit that codes the recording data according to a first error correction coding format, a second error correction coding circuit that codes the recording data according to a second error correction coding format, and a recorder that converts the recording data into a recording signal and records it on an optical disc. The second error correction coding format is different in an arrangement of the recording data from the first error correction coding format. The second error correction coding format is configured to generate a second parity code with a higher degree of redundancy. The recorder records the recording data coded by the first error correction coding circuit and only the second parity code in the recording data coded by the second error correction coding circuit.

公开(公告)号：US09063871B2

公开(公告)日：2015-06-23

申请号：US14112396

申请日：2013-04-01

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Tsuyoshi Nakasendo ,  Yasumori Hino ,  Kohei Nakata ,  Yuji Takagi

IPC: G06F11/10 ,  H03M13/45 ,  H03M13/29 ,  H03M13/00 ,  G11B20/10 ,  G11B20/18 ,  H03M13/11

CPC classification number: G06F11/10 ,  G11B20/10361 ,  G11B20/1833 ,  H03M13/1111 ,  H03M13/2957 ,  H03M13/45 ,  H03M13/6343 ,  H03M13/6577

Abstract: A decoding device (1) has: a reliability calculating unit (5) which calculates reliability information having a non-linear relationship with a noise distribution of a PR communication path (3) in at least part of or all of the reliability information based on characteristics of the PR communication path (3) and a predetermined modulation rule from an encoded signal that is obtained from the PR communication path (3); a reliability correcting unit (17) which corrects the reliability information calculated by a reliability calculating unit (5); and an error correction decoding unit (18) which performs error correction decoding on the reliability information corrected by the reliability correcting unit (17).

Abstract translation: 一种解码装置（1）具有：可靠性计算部（5），在至少一部分或全部可靠性信息中，根据PR通信路径（3）的噪声分布，计算与所述PR通信路径（3）的噪声分布具有非线性关系的可靠性信息 PR通信路径（3）的特征和来自PR通信路径（3）获得的编码信号的预定调制规则; 可靠性校正单元，其校正由可靠性计算单元计算出的可靠性信息; 以及对由可靠性校正单元（17）校正的可靠性信息执行纠错解码的纠错解码单元（18）。