DSP Project
The project described shows in detail how to digitise a colour Phase Alternate Line (PAL) signal from any PAL source such as a CCD or Scart Socket. The project is a micro electronic circuit for decoding a PAL signal using an embedded TMS320 microprocessor. The raw PAL signal is conditioned by a high frequency op amp to give a signal range of 0 to 5 volts. The signal is then sampled by the analogue to digital converter at 20 MHz, using its whole dynamic range, each sample is stored in memory as it is taken. The memory is then accessed by the microprocessor and the raw data is processed using a mathematical algorithm, the results are then sent to a PC using Enhanced Parallel Protocol (EPP). The PC uses a C++ program to load data and draw the image on the screen. This project was a success and all objectives were met. Images produced can be seen in the C++ Windows results section.
http://www.hackinghardware.com/hh/projects/dsppal/contents.htm