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1. 发明公开

EP3252772A1 REPRODUCTION DEVICE AND REPRODUCTION METHOD 失效
标题翻译：再生装置和再生方法
公开(公告)号：EP3252772A1
公开(公告)日：2017-12-06
申请号：EP15879825.6
申请日：2015-11-19
申请人： Sony Corporation
发明人： SEKIGUCHI, Koji , SAITO, Kimihiro
IPC分类号： G11B7/005 , G11B7/135 , G11B20/10 , G11B20/18
CPC分类号： G11B20/10046 , G11B7/005 , G11B7/00718 , G11B7/131 , G11B7/1365 , G11B20/10009
摘要： A set of first signal light and reference light with a phase difference of almost 0 degree, a set of second signal light and reference light with a phase difference of almost 180 degrees, a set of third signal light and reference light with a phase difference of almost 90 degrees, and a set of fourth signal light and reference light with a phase difference of almost 270 degrees are generated. A first differential signal as a difference between a first light-receiving signal obtained by a first light-receiving element and a second light-receiving signal obtained by a second light-receiving element is calculated, and a second differential signal as a difference between a third light-receiving signal obtained by a third light-receiving element and a fourth light-receiving signal obtained by a fourth light-receiving element is calculated. The first differential signal and the second differential signal are supplied to respective FIR filters. An equalization error is formed from output signals from the FIR filters. Tap coefficients for the FIR filters are controlled to minimize the equalization error.
摘要翻译：一组第一信号光和具有几乎0度相位差的参考光，一组第二信号光和具有几乎180度相位差的参考光，一组第三信号光和具有相位差为几乎90度，并且产生具有几乎270度的相位差的一组第四信号光和参考光。计算作为由第一光接收元件获得的第一光接收信号和由第二光接收元件获得的第二光接收信号之间的差的第一差分信号以及作为第二差分信号计算由第三光接收元件获得的第三光接收信号和由第四光接收元件获得的第四光接收信号。第一差分信号和第二差分信号被提供给各个FIR滤波器。均衡误差由FIR滤波器的输出信号形成。控制FIR滤波器的抽头系数以最小化均衡误差。

2. 发明授权

EP3252772B1 REPRODUCTION DEVICE AND REPRODUCTION METHOD 失效
公开(公告)号：EP3252772B1
公开(公告)日：2019-08-21
申请号：EP15879825.6
申请日：2015-11-19
申请人： Sony Corporation
发明人： SEKIGUCHI, Koji , SAITO, Kimihiro
IPC分类号： G11B20/10 , G11B7/005 , G11B7/131 , G11B7/007 , G11B7/1365

3. 发明公开

EP3451337A1 REPRODUCTION DEVICE AND REPRODUCTION METHOD 有权转让
公开(公告)号：EP3451337A1
公开(公告)日：2019-03-06
申请号：EP17788978.9
申请日：2017-01-27
申请人： Sony Corporation
发明人： SAITO, Kimihiro , HORIGOME, Toshihiro , SEKIGUCHI, Koji , KUROKAWA, Kotaro
IPC分类号： G11B7/005 , G11B7/135
摘要： Provided is a reproducing apparatus including: a reproduction signal generating circuit that calculates a first difference signal a which is a difference between a first light receiving signal obtained by the first light receiving element and a second light receiving signal obtained by the second light receiving element, and a second difference signal b which is a difference between a third light receiving signal obtained by the third light receiving element and a fourth light receiving signal obtained by the fourth light receiving element, and uses the first difference signal a, the second difference signal b, a phase difference Ψ between a crosstalk component and an average phase of the signal light beam, and an optical path length difference θ between the signal light beam and the reference light beam to carry out an arithmetic operation of a • sin Ψ − θ t − b • cos Ψ − θ t to obtain a reproduction signal; and a phase extraction circuit that obtains a successive change amount Δθ of θ and updates θ with the successive variation Δθ.

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