Research of the HDMI CEC standard and its application in Lightware video matrices

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Dr. Iváncsy Szabolcs
Department of Automation and Applied Informatics

Nowadays most households have a high resolution television with the corresponding signal source(s). In professional applications there can be tens of displays and sources. There are many kinds of transfer interfaces that we can use between sources and drains. In the last few years the previously used analog solutions were superseded by digital transmission. One of the most commonly used digital image transmission standards is the HDMI. This standard defines Consumer Electronics Control, or CEC for short, which makes communication between HDMI-capable devices possible.

The reader of this thesis can get an insight into the world of video and audio signals as well as into the development processes of a professional AV supplier. The introductory chapters define all the basic concepts of video technology, and describe the significant parts of the standard that defines CEC.

After this theoretical overview the stucture and some basic functionalities of the Lightware 25G Hybrid video matrix are introduced, along with the protocols that can be used for its control.

The next chapter describes the CEC interface that I implemented in the 25G matrix, along with possible applications and limitations due to the standard and the architecture. After that, I explain the further development of the interface, which now simulates multiple devices.

Then I also describe the functions and user interface of the test environment that I created to demonstrate these new features. In the next chapter I explain the steps of implementing a menu system (On Screen Display) that can be controlled via CEC in this environment.


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