>        I have a composite video signal (PAL) with *no* sync pulses at all.
>I  would  like  to  build  a  simple  circuit  to put the sync back (a sync
>restorer).   Ideally,  vertical  & horizonal phase (and frequency -- slight
>changes) would be adjustable.

Although there're a variety of timebase chips that would do this cheaply, you're
still going to need a reference to lock on to... eg you can't just re-insert
syncs from a free running timebase - (you could try locking to colour subcarrier
and dividing down - but it's not too easy in PAL..

I had been thinking that a PIC would be good for doing an intelligent sync
capture (look for absence of picture etc) and locking a pll to the output of
the Pic - haven't done the sums tho'....

Jim