著者

阪本 清美 坂下 誠司 山下 久仁子 岡田 明

出版者

ヒューマンインタフェース学会

雑誌

ヒューマンインタフェース学会論文誌 (ISSN:13447262)

巻号頁・発行日

vol.19, no.1, pp.119-128, 2017-02-25 (Released:2018-12-10)

参考文献数

11

被引用文献数

1

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We carried out experiments to investigate the relationship between display resolution and physiological and psychological state during the viewing of 4K and 2K content on a 65-inch 4K TV as a comparison between age groups. During viewing tests of 4K scenic content by participants in their 20s and 50s, psychological evaluation scores and NIRS, an index of nervous system activity, were significantly higher during 4K scenic content viewing than for 2K viewing. However, the effect of the display resolution for content comprising video images of fine objects such as food, jewels, watches, glass and fur, was limited compared to that for scenic content between age groups. Our results suggest that content viewing at 4K tends to cause psychological elation and a surge in brain activity, although the effects varied somewhat according to content, and these effects of display resolution on physiological and psychological state were found regardless of age groups.

著者

阪本 清美 浅原 重夫 坂下 誠司 山下 久仁子 岡田 明

出版者

一般社団法人 日本人間工学会

雑誌

日本人間工学会大会講演集 日本人間工学会第53回大会

巻号頁・発行日

pp.368-369, 2012 (Released:2012-10-27)

著者

林 健一郎 木村 知弘 影山 定司 原田 泰男 木曽田 晃 坂下 誠司

出版者

一般社団法人映像情報メディア学会

雑誌

テレビジョン学会技術報告 (ISSN:03864227)

巻号頁・発行日

vol.20, no.53, pp.55-60, 1996-10-17

被引用文献数

42

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This paper proposes an adaptive equalization technique for OFDM (Orthogonal Frequency Division Multiplexing) demodulation. This technique estimates a channel response with using pilot signals embedded in OFDM symbols. A two dimensional filter used for interpolating the response estimates the channel response accurately, and also improves the C/N by reducing noise bandwidth. The bit error rate performance of the system in various channels is calculated by computer simulation, and the relative C/N improvement to differential demodulation is about 2.5 dB. And the result shows that the optimum filter can be determined by the maximum path delay time and the maximum doppler frequency of the channel.