Quote:
Originally Posted by Eric H
I wonder just how critical these integrators are?
I forgot to fix the one with the broken lead (Sylvania) and put the set back together, touching it to where it was supposed to go only made a slight shift in the picture anyhow so I didn't feel like taking it apart again, the other one (Wilcox-Gay) i just left alone (i had made up one from parts and tacked it on but removed it).
I know you can build them out of individual components (most older sets have them made that way anyhow, always 8200 ohm resistors too.) but I was wondering what exactly are they supposed to do?
Maybe in the two cases here they were working enough to pass sync but were lacking in some other way?
|
One of the goals of a vertical integrator is to get vertical deflection such that you do not get line pairing of the scan lines from one field to the next. Analog NTSC TV used interlaced scanning, and one field's lines should get "written" on the CRT faceplate phospor halfway between the lines of the other field. The integrator ties to remove the effects of the horizontal sync pulses. One vertical sync pulse starts at the beginning of a horizontal line, next field, it starts halfway into a horizontal line. If the vertical oscillator gets too much influence from the horizontal, the scan lines will end up on top of each other (pairing) instead of halfway between, and the picture loses vertical resolution. The integrator filters out the horizontal pulses. A bad integrator will probably give you pairing. The picture should look better if you fix it.