The development of video studio control clock

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Dr. Magyar Gábor Béla
Department of Telecommunications and Media Informatics

My thesis describes the making of a studio clock controler, created for a video studio.

The first step was examining the synchronization standards, approved bye the Society of Motion Picture and Television Engineers (SMPTE), in common use in broadcast and professional studios.

I also examined other time-synchron systems, such as the shortwave DCF77, and the Global Positioning System (GPS), as well as the Network Time Protocol System (NTP) used in the computing world.

For the control of the „ studio clock”, I employed the SMTPE’s Longitudinal Time code (LTC) because its use is widespread in video technology and one is able to purchase ready-made clocks.

In order to „squeeze out” extra time, I targeted the synchronization sources found in the NTP and LTC systems

To implement the project, I chose the ATMega 644 microcontroller (AVR); to synchronize it with the NTP; I selected the ENCj60 Ethernet control.

The Ethernet control system also made it possible to prepare a Word Wide Web page through which one can control the instrument’s input and output functions.


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