VHDL-Teletext: FPGA-based teletext decoder and development board with HDMI outDesigned by Nick's Electronics in United Kingdom
What is it? Teletext is a system for transmitting pages of text and simple graphics in a hidden part of a TV signal for display on TV sets with an appropriate decoder. This system was originally de...Read More…
Teletext is a system for transmitting pages of text and simple graphics in a hidden part of a TV signal for display on TV sets with an appropriate decoder. This system was originally developed in the 1970s, and remains popular today in Europe despite being little-known elsewhere.
An FPGA development board designed for the application of decoding WST (World System Teletext) and displaying it on a HDMI monitor/TV. The board is pre-programmed with my open-source VHDL-Teletext firmware and all you need is a micro USB power supply, HDMI or DVI monitor, and a source of teletext data with composite video out such as a Raspberry Pi running VBIT2 or a satellite receiver. 50/60Hz output and choice of 576p and 800x600 resolutions for compatibility with international TVs.
The board is suitable for all manner of FPGA projects. The Altera MAX 10 FPGA has 8k logic elements which is enough for complex hobby FPGA projects. In addition to HDMI connectivity and the built-in keypad and buttons, 23 I/O are connected to headers to allow connection to other devices, providing the potential for diverse applications such as a Telesoftware decoder or a replica of an old microcomputer.
I made it because I wanted to create a Teletext decoder which does not depend on obsolete components and has a high-quality, modern, video output connection.
The unique combination of hardware features needed made existing FPGA development boards unsuitable. Limited stocks of old obsolete decoder chips are still available but these only have low-quality composite video outputs and usually only work with PAL TVs.
This is the world's only standalone teletext decoder with HDMI output.
* Resolution support tested up to 800x600. 1280x720 should be possible if the high-speed part of the HDMI code is modified to use double data rate I/O.
Pre-assembled VHDL-Teletext FPGA board with keypad
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