• The Journal of Korean Association of Computer Education
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• v.14 no.6
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• pp.83-89
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• 2011

In this study a smart HDMI switch is proposed to detect newly formed video stream and automatically change the transfer path to the corresponding port without pulling the HDMI plug and putting it again in the desired port manually and physically. Furthermore the proposed switch is designed in the advanced wireless video transmission scheme based on millimeter band technology. The proposed system shows its feasibility by the hardware experiment in the full-HD video transmission performance including the function of the smart port change.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10d
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• pp.613-618
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• 2007

현재 하나의 TV에 연결할 수 있는 수많은 기기들이 개발, 판매되고 있다. 이렇게 연결하는 방법 중 현재 많이 사용하고 있는 방법 중에 하나인 HDMI의 경우에 HDMI-CEC라는 기능을 도입해서 연결된 각각의 기기를 따로따로 컨트를 하지 않고 하나의 리모컨으로 적용하는 방안을 제시하고 있다. 현재 가정에서 사용하는 DVD-Recorder에 HDMI-CEC 기능을 대응하여, 사용자가 원하는 기능을 여러 개의 기기를 직접 제어하는 것이 아니라, 단 하나의 키 동작으로 여러 개의 기기를 동시에 제어하는 시스템을 설계한다면 사용자에게 많은 편의를 줄 수가 있다. 그러나, 이러한 시스템을 설계했을 경우에 사용자가 원하는 동작을 정확히 안 하는 문제, 반응 속도가 너무 느려서 사용자가 동작을 안 하는 것으로 착각하게 만드는 문제와 HDMI-CEC의 Spec에서는 제시하고 있지 않으나 사용자의 편의물 위해서 지원해야 하는 경우가 있을 수 있다. 이 논문에서는 HDMI-CEC와 PDC의 spec에 대한 설명을 하고, HDMI-CEC를 적용한 시스템에 대한 설계를 한다. 그리고, 그 시스템에서 발견된 문제 중 정확한 동작을 하지 않는 TV가 꺼져있는 OnTouchPlay의 경우의 대한 처리와, 반응 속도가 느린 경우인 시스템을 부팅하는 경우의 반응시간을 줄이는 방안, 그리고 HDMI-CEC의 spec에는 없으나 사용자의 편의를 위해서 지원해야 하는 기능들에 대해 논한다.

• 전자공학회논문지 IE
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• v.46 no.3
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• pp.48-54
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• 2009

In this paper, a test method of HDMI connectors is developed using a test zig. This method is used to test the characteristic for a digital signal connector, and is applied the compliance test specification. The test results of connectors for the two manufactory are implemented by the new proposed method. Finally, it is suggested to the new test method of HDMI connector in this paper, and is applied to the simple test method of connector in manufactory.

• Electronics and Telecommunications Trends
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• v.31 no.1
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• pp.111-120
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• 2016

최근 디스플레이 기기의 해상도에 대한 관심이 높아지면서 고화질용 멀티미디어 인터페이스의 중요성이 부각되고 있다. 화질 저하를 막기 위해 과거의 아날로그 인터페이스에서 디지털 인터페이스로 변화되었고, 이후 포트의 크기 축소와 음성지원의 필요성이 대두됨에 따라 고화질 멀티미디어 인터페이스(High-Definition Multimedia Interface: HDMI) 기술이 개발되었다. 2002년에 HDMI 규격이 발표된 이후, PC, DVD 플레이어, TV 등 다양한 멀티미디어 기기에서 그 사용이 꾸준히 증가되고 있다. 또한, HDMI 케이블의 전송거리 제한을 극복하기 위한 노력의 일환으로 최근 수백 meter에서 수십 km까지 전송이 가능한 광 HDMI 기술이 개발되어 그 활용도가 높아지고 있다. 본고에서는 HDMI의 기술동향을 살펴보고 최근 개발된 광 HDMI 기술의 개발현황을 소개하고자 한다.

• Journal of Satellite, Information and Communications
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• v.11 no.2
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• pp.23-28
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• 2016

In this paper, we proposed the novel algorithm which controls the resolution of the HDMI(High Definition Multimedia Interface) by the channel estimation from WiFi-AP(Access Point) in the ISM(Industry-Science-Medical) band. The 2.4 and 5 GHz channel models are widely used since they have identical RF property as RSSI(Received Signal Strength Indication). Especially, the performance degradation of signal-transmission and streaming of WiFi will be occurred by the co-channel interference between AP(Access Point) and increased number of smart devices. Therefore, the optimization scheme of video format timing was designed by HDMI-CEC(Consumer Electronics Control) which considers the transmission speed of radio channel. The HDMI resolution, video quality of home-gateway and digital TV and the decision of PIP position can be maintained by the protocols between smart devices and DLNA(Digital Living Network Alliance) via proposed technique.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.735-736
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• 2008

Recently Multi media industry require HDMI-CEC which is the system to integrate various product one action. So you need to implement CEC when you use HDMI1.3a. In this paper, presented how to make CEC protocol in MCU and how to reduce power consumption. This system implement CEC protocol and uart communication as using WELTREND MCU.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.4
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• pp.211-215
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• 2015

In this paper, we propose a internal antenna for wirless HDMI dongle device using the folded monopole structure. The proposed antenna is for 2.4GHz and 5.8GHz. The antenna optimized for parameters length, gap, width, and radius of semicircular of monopole antenna using the 'F' structure. To confirm the characteristics of the antenna parameters, HFSS from ANSYS Inc. was used for the analysis. We used an FR4 dielectric substrate with a dielectric constant of 4.4. The HDMI dongle size of the proposed antenna is $45{\times}20{\times}1mm$, and the size of the antenna area is $5{\times}20mm$. There is a value of return loss less then -10dB in 2.4GHz and 5.8GHz, band and the maximum antenna gain is -4.13dBi. The result proved the possibility of the practical using 'F' structure that came frin comparing and analyzing the measured and simulated data of the antenna.

• JSTS:Journal of Semiconductor Technology and Science
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• v.12 no.1
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• pp.10-17
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• 2012

This paper presents a clock regenerator using two $2^{nd}$ order ${\sum}-{\Delta}$ (sigma-delta) modulators for wide range of dividing ratio as defined in HDMI standard. The proposed circuit adopts a fractional-N frequency synthesis architecture for PLL-based clock regeneration. By converting the integer and decimal part of the N and CTS values in HDMI format and processing separately at two different ${\sum}-{\Delta}$ modulators, the proposed circuit covers a very wide range of the dividing ratio as HDMI standard. The circuit is fabricated using 0.18 ${\mu}m$ CMOS and shows 13 mW power consumption with an on-chip loop filter implementation.

• Journal of Convergence for Information Technology
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• v.11 no.12
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• pp.90-96
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• 2021

In this paper, we designed manufactured and design an integrated interface control unit that has compatibility with brightness control unit, color control unit, and existing control unit. As the implementation method the standard of DVI/HDMI transmission method is applied to the data transmission method, and the Sil 1169 IC is used as the applied IC. Brightness control is programmed to have eight levels of brightness control using the AT89C2051. Also, EPM240T100C5 IC was used for image and dimming data processing. As a result, it is compatible with the control unit using the DVI/HDMI transmission method manufactured by each company and can reproduce clear high quality full HD video according to the surrounding brightness through the full color LED display system.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.2
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• pp.289-296
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• 2019

Recently, the development of smartphone camera technology enables to shoot high quality video. In order to utilize these techniques in various ways, it is necessary to be able to transmit signals to an external device such as a external display. The transmission performance of the video signal is determined by the loss of the transmission line and the length of the wiring. In this paper, we propose the HDMI transmission line design criterion according to the wiring length changed according to the smartphone design and the surface roughness amplitude of the printed circuit board conductor wiring material. Also, we verified the proposed design criteria for the actual smartphone design. The proposed design criterion can be applied to various application fields including high-speed signal transmission line besides mobile application.