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Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2016-08-29

A video coding apparatus comprises a motion prediction unit configured to perform motion prediction for a plurality of coding unit sizes of an original image serving as the picture of an input video signal and evaluate results obtained by the motion prediction for the coding unit sizes so as to supply a first evaluation value; a merge mode evaluation unit configured to evaluate each of merge candidates on a coding unit of the merge size determined by a merge size determination unit so as to supply a second evaluation value of each of the merge candidates; and an inter-prediction mode determination unit configured to determine a mode used for coding on the basis of the second evaluation value obtained by the merge mode evaluation unit and the first evaluation value of the coding unit sizes.


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2017-03-01

A video coding apparatus comprises a motion prediction unit configured to perform motion prediction for a plurality of coding unit sizes of an original image serving as the picture of an input video signal and evaluate results obtained by the motion prediction for the coding unit sizes so as to supply a first evaluation value; a merge mode evaluation unit configured to evaluate each of merge candidates on a coding unit of the merge size determined by a merge size determination unit so as to supply a second evaluation value of each of the merge candidates; and an inter-prediction mode determination unit configured to determine a mode used for coding on the basis of the second evaluation value obtained by the merge mode evaluation unit and the first evaluation value of the coding unit sizes.


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2017-02-15

A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n


Patent
NTT Electronics, Nippon Telegraph and Telephone | Date: 2015-08-19

Disclosed is an optical circuit including a transparent plate, which is light-transmittable, and a light shielding plate, which is adhered to the transparent plate with an adhesive and has an opening through which incident light passes, and in which the aspect facing to the opening has, on the side opposite to the transparent plate, projections in an overhang shape toward the center of the opening.


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2015-05-13

Provided is a lens holder, a lens optical component, or a package equipped with the lens optical component, in which poor welding between a lens housing and the lens holder may not occur. A lens holder includes a pair of leg members inclined and extending to a lens housing from a support member that supports the lens holder at a predetermined position. A distance between pair of leg members is set such that the distance between lower end portions is equal to or larger than a width of the lens housing to be supported, and the distance between upper end portions is equal to or smaller than the width of the lens housing to be supported, and that the distance becomes gradually smaller from the lower end portions to the upper end portions of the legs. A lens optical component includes a lens housing holding a lens, and the lens holder. The pair of leg members at the upper end portions are in contact with the lens housing, and welded at portions in contact with the lens housing. A package is equipped with the lens optical component and two or more optical components. The lens optical component is inserted in an optical path of the two or more optical components, and the height of the lens holder is set to be equal to a height of the input-output portion of an optical device.


Patent
NTT Electronics, Nippon Telegraph and Telephone | Date: 2015-03-09

A method of manufacturing an optical module, comprising: mounting on a plane of a flat-plate-shaped base having a predetermined thickness: (a) an optical semiconductor package in which an active optical element is air-tightly sealed; (b) a waveguide optical element which wave-guides light from an optical fiber or to an optical fiber; and (c) an optical lens which connects the active optical element and the waveguide optical element; irradiating the plane with laser light at an angle close to horizontal to fix the optical lens using spot welding; covering the optical semiconductor package, the waveguide optical element, and the optical lens, with a frame-equipped lid having a bathtub shape; and fixing the frame-equipped lid onto the plane of the flat-plate-shaped base.


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2016-02-03

An optical switch with a flat transmission property is provided. The optical switch includes an input port, an output port, a diffractive grating configured to perform wavelength demultiplexing on an optical signal from the input port, and LCOS configured to deflect the wavelength-demultiplexed optical signal to the output port. The diffractive grating is pre-arranged such that a shape of the optical signal as entering the LCOS is asymmetric with respect to an axis in the LCOS surface that is orthogonal to a wavelength axis of the diffractive grating.


Patent
Nippon Telegraph, Telephone and NTT Electronics | Date: 2015-06-03

An objective is to provide an integrated optical module which can avoid positional change and separation of a PLC chip when humidity changes. Provided is an integrated optical module characterized in that the integrated optical module includes: a PLC chip (33) ; a seat (42) bonded and fixed to part of a lower surface of the PLC chip (33) with an adhesive which is applied to an upper surface of the seat (42) ; and a support portion (41) supporting the seat (42), in which a groove where an adhesive overflowing from the upper surface of the seat (42) is to stay is formed in an upper surface of the support portion (41) at a portion surrounding the seat (42), the upper surface of the seat serving as an adhesion surface.


Patent
NTT Electronics | Date: 2015-09-30

A position coordinate difference computing unit (5a to 5c) calculates position coordinate differences between position coordinates of the output digital signals and position coordinates of the input digital signals adjacent to the position coordinates. An FIR coefficient memory (13a to 13c) stores FIR coefficients of an FIR-LPF and outputs FIR coefficients corresponding to position coordinate differences between a fixed number of the output digital signals adjacent to the position coordinates of the output digital signals and the output digital signals. A control unit (11) supplies a group of the FIR coefficients and a group of the input digital signals corresponding to the respective position coordinate differences to the parallel FIR calculator (4) in predetermined order when the position coordinate differences corresponding to two or more different output digital signals are concurrently computed. The parallel FIR calculator (4) performs an FIR-LPF interpolating calculation by using those to obtain the output digital signals.


Patent
NTT Electronics | Date: 2015-07-01

A position coordinate difference calculation section (5) calculates a position coordinate difference between a position coordinate of an output digital signal and a position coordinate of an input digital signal close to it. An FIR coefficient memory (9) stores FIR coefficients of an FIR-LPF having such a characteristic as to cut off frequency components equal to or higher than 1/2 of an output sampling rate. When the position coordinate difference is input, the FIR coefficient memory outputs FIR coefficients corresponding to position coordinate differences between position coordinates of a certain number of input digital signals existing in the vicinity of the position coordinate of the output digital signal and the position coordinate of the output digital signal. AN FIR computation unit (3) performs FIR-LPF interpolation computation by using a certain number of the input digital signals and the FIR coefficients and obtains the output digital signal.

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