REPRODUCTION DEVICE AND REPRODUCTION METHOD

Title:

REPRODUCTION DEVICE AND REPRODUCTION METHOD

Document Type and Number:

WIPO Patent Application WO/2017/187688

Kind Code:

A1

Abstract:

This reproduction device includes a reproduction signal generation circuit and a phase extraction circuit. The reproduction signal generation circuit obtains a reproduction signal by calculating a first difference signal a which is a difference between a first light reception signal obtained by a first light-receiving element and a second light reception signal obtained by a second light-receiving element, and a second difference signal b which is a difference between a third light reception signal obtained by a third light-receiving element and a fourth light reception signal obtained by a fourth light-receiving element, and using the first difference signal a, the second difference signal b, a phase difference Ψ of the average phase between a crosstalk portion and signal light, and an optical path length difference θ between the signal light and the reference light to compute the following formula. a ∙ sin (Ψ − θ (t)) − b ∙ cos (Ψ − θ (t)) The phase extraction circuit acquires series of changes ∆θ in θ and updates θ using the series of changes ∆θ.

Inventors:

SAITO KIMIHIRO (JP)
HORIGOME TOSHIHIRO (JP)
SEKIGUCHI KOJI (JP)
KUROKAWA KOTARO (JP)

Application Number:

PCT/JP2017/002958

Publication Date:

November 02, 2017

Filing Date:

January 27, 2017

Export Citation:

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Assignee:

SONY CORP (JP)

International Classes:

G11B7/005; G11B7/135

Domestic Patent References:

WO2013031120A1

2013-03-07

Foreign References:

JP2015028823A	2015-02-12
JP2014032728A	2014-02-20
JP2013054801A	2013-03-21

Other References: