How does Picture-In-Picture (PIP) work?
A separate video input or tuner provides the PIP baseband signal which is then resized and stored in a frame buffer large enough to hold the X and Y dimensions of the PIP image. Readout is timed to place the PIP image in the selected area of the screen and it is substituted for the main video. What could be simpler?! Tony’s notes on setting convergence on delta gun CRTs (This section from: ard12@eng.cam.ac.uk (A.R. Duell)) The older delta-gun tubes (3 guns in a triangle, not in a line) can give **excellent** pictures, with very good convergence, provided: • You’ve set those 20-or-so presets correctly – a right pain as they interact to some extent. • The CRT is set up in the final position – this type of tube is more sensitive to external fields than the PIL type. Both my delta-gun sets (a B&O 3200 chassis and a Barco CDCT2/51) have very clearly set out and labeled convergence panels, and you don’t need a service manual to do them. The instructions in the Barco manual are something like
A separate video input or tuner provides the PIP baseband signal which is then resized and stored in a frame buffer large enough to hold the X and Y dimensions of the PIP image. Readout is timed to place the PIP image in the selected area of the screen and it is substituted for the main video. What could be simpler?!
