公开(公告)号：US20210006892A1

公开(公告)日：2021-01-07

申请号：US16977002

申请日：2019-02-28

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Kimitaka TSUTSUMI ,  Kenichi NOGUCHI ,  Hideaki TAKADA ,  Yoichi HANEDA

IPC: H04R1/40 ,  H04R3/12

Abstract: An acoustic signal processing device 1 includes: a focal point position determination unit 12 that obtains a plurality of sets of initial focal point coordinates, coordinates of the virtual sound source, and a direction of directivity thereof, and for a pair of sets of initial focal point coordinates with different polarities among the plurality of sets of initial focal point coordinates, multiplies the sets of initial focal point coordinates by a rotation matrix based on the coordinates of the virtual sound source to thereby determine sets of focal point coordinates, the rotation matrix being specified from the direction of the directivity; a circular harmonic coefficient conversion unit 13 that calculates weights to be applied to multipoles including the sets of focal point coordinates from a circular harmonic coefficient; a filter coefficient computation unit 14 that, for each of the speakers in the speaker array, computes a weighted driving function to be applied to the speaker from the sets of focal point coordinates, polarities of the sets of focal point coordinates, and the weights to be applied to the multipoles; and a convolutional operation unit 15 that, for each of the speakers in the speaker array, convolves the weighted driving function for the speaker into the input acoustic signal to output the output acoustic signal for the speaker.

公开(公告)号：US20220239894A1

公开(公告)日：2022-07-28

申请号：US17614987

申请日：2019-05-31

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Motohiro MAKIGUCHI ,  Hideaki TAKADA

IPC: H04N13/366 ,  H04N13/363 ,  H04N13/156 ,  G06T7/00

Abstract: Provided is an image generation technology capable of suppressing unpleasantness associated with fluctuation in image quality caused by the viewer's viewpoint movement. A synthesis ratio determination unit of an image generation apparatus includes: an image quality evaluation index calculation unit that generates a synthesis image J1 from an observation viewpoint image I1 and an intermediate viewpoint image I2, and a synthesis image J3 from an observation viewpoint image I3 and an intermediate viewpoint image I2, for a plurality of synthesis ratios, calculates an image quality evaluation index in an observation viewpoint V1, an image quality evaluation index in an intermediate viewpoint V2, and an image quality evaluation index in an observation viewpoint V3 by using the synthesis images J1 and J3, and calculates a variation v of an image quality evaluation index by using the image quality evaluation index in the observation viewpoint V1, the image quality evaluation index in the intermediate viewpoint V2, and the image quality evaluation index in the observation viewpoint V3; and an image quality evaluation index comparison unit that determines a synthesis ratio A based on the variation v of the image quality evaluation index.

公开(公告)号：US20210112237A1

公开(公告)日：2021-04-15

申请号：US17047627

申请日：2019-04-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Motohiro MAKIGUCHI ,  Hideaki TAKADA ,  Taiki FUKIAGE ,  Shinya NISHIDA

IPC: H04N13/282 ,  H04N13/111

Abstract: Provided is an image generation technology capable of suppressing unpleasant feelings caused by fluctuation in image quality caused by the viewer's viewpoint movement. The image generation technology includes an image generation unit configured to generate a pseudo viewpoint image Iφk and a pseudo viewpoint image I−φk, by using disparity inducing edge Dφk having a phase difference φk from a viewpoint image I, where φk(1≤k≤K) is set as a real number satisfying 0

公开(公告)号：US20230161174A1

公开(公告)日：2023-05-25

申请号：US17920186

申请日：2020-04-21

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Motohiro MAKIGUCHI ,  Hideaki TAKADA ,  Takashi SATO

IPC: G02B30/56 ,  G02B17/00 ,  G02B30/10

CPC classification number: G02B30/56 ,  G02B17/006 ,  G02B30/10

Abstract: A floating image display apparatus of the present embodiment includes: a first display unit (11) that is installed to have a display surface facing toward a ground; a first optical element (21) that is installed to be inclined with respect to the ground, and transmits a part of light emitted from the first display unit (11) and reflects a part of the light; a second display unit (12) that is installed to have a display surface perpendicular to the ground; and a second optical element (22) that is installed to be perpendicular to the ground, and transmits a part of light emitted from the second display unit (12) and reflects a part of the light.

公开(公告)号：US20220191464A1

公开(公告)日：2022-06-16

申请号：US17603196

申请日：2019-05-14

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Motohiro Makiguchi ,  Hideaki TAKADA

IPC: H04N13/363 ,  H04N13/366 ,  G02B27/00

Abstract: Provided is a display method that prevents degradation of image quality due to ghosting. The display method performed with a display apparatus includes a viewpoint position detection step (S1) for detecting a viewpoint position d that is an interval between a reflection screen and a viewer α, a diffusion property control step (S2) for controlling a diffusion property of the reflection screen 40 in accordance with the viewpoint position d, and a projection step for projecting multiple viewpoint video images having disparity from multiple projectors to the reflection screen. The diffusion property control step (S2) includes controlling the diffusion property of the reflection screen 40 by varying a voltage or a duty cycle of an ac signal that is applied to a diffuser layer included in the reflection screen.

公开(公告)号：US20210105571A1

公开(公告)日：2021-04-08

申请号：US17050102

申请日：2019-04-15

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Kimitaka TSUTSUMI ,  Kenichi NOGUCHI ,  Hideaki TAKADA ,  Yoichi HANEDA

IPC: H04S7/00 ,  H04R3/12 ,  H04R5/04 ,  H04R5/02

Abstract: Provided is a sound image reproduction device, sound image reproduction method, and sound image reproduction program that can support monaural sound sources and is capable of imparting directivity to virtual sound sources in a space. An acoustic signal processing device (sound image reproduction device) 1 that generates virtual sound sources in a space using multiple loudspeakers arranged in a straight line, includes: a focal-point position determination unit 12 that determines the position of each virtual sound source to generate multiple virtual sound sources in a circular arrangement; a filter-coefficient determination unit 13 that calculates an impulse response vector for each loudspeaker by performing an inverse Fourier transform on a driving function for each loudspeaker that is used to generate a virtual sound source at the position of each virtual sound source and in which different weights are given to some of the virtual sound sources; and a convolution calculation unit 14 that calculates the convolution of one inputted acoustic signal with the impulse response vector for each loudspeaker and outputs each acoustic signal to the corresponding the multiple loudspeakers.