A 405 LINE TEST CARD SIGNAL GENERATOR
Designed by myself and I only wish 405-Alive magazine
The basic idea behind this design is to store one complete image (i.e. two interlaced scans) in an EPROM in a linear fashion, complete with all the sync pulses and front/back porches. The output of the EPROM can then be fed to a suitable D.A.C. so as to produce the required video signal. Of course, this method could be applied to the generation of any video signal format.
A PC based package software package allows any image (in .BMP format) to be converted to an appropriate EPROM image.
The project is broken down into the following sections :-
|The 405-line TV Waveform
|An overview of the signal we are trying to generate
|How the data is encoded in the EPROM.
|The EPROM size, timing and output logic
|The EPROM address counter
|The Master Clock
|The master clock that drives the circuit
|Converting the EPROM data to an analogue signal.
|Skip the waffle, just download it
Thanks go to Peter Brown who had a working EPROM blower, working 405-line set and the necessary debugging skills.
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1st August 2002