Den Sun, 5 Nov 2017 20:42:44 +0100 skrev silverdr@wfmh.org.pl: > > > On 2017-11-05, at 20:31, Mia Magnusson <mia@plea.se> wrote: > > > >>> Well, you can use a PLL for the system clock oscillator and > >>> control the PLL so sync *outputs* from the Amiga is in phase with > >>> sync from the signal you genlock onto. > >> > >> Theoretically looks like you could probably do this (and then > >> constantly monitor for drifting and react), but the questions are: > >> > >> 1) why make it more difficult and expensive while at the same time > >> potentially less reliable and slower to lock? > > > > If you only feed h+v-sync into the computer but let the computer run > > the pixel clock of it's internal oscillator then you will have > > jitter of atleast one 28MHz clock cycle. > > Now it's me "?" ... Which part is hard to understand? > >> 2) what for - if there is nobody willing to listen to those sync > >> pulses anyway? > > > > ? > > You wanted to sync the output pulses from the computer. The question > is what would you use those for if nobody is willing to listen to > them. The whole "house" listens to "house sync", not to what one of > the slave appliances in the house is trying to say. A PLL is used to control a 28MHz VCO feeding the 28MHz input so the outputed h+v-sync from the computer is in sync with the "house sync". This is the only way to generate a jitter free genlocked picture. Of course the computer would sync faster if you also feed it h+v-sync, but that isn't strictly necessary as you anyway need to feed 28MHz. -- (\_/) Copy the bunny to your mails to help (O.o) him achieve world domination. (> <) Come join the dark side. /_|_\ We have cookies. Message was sent through the cbm-hackers mailing listReceived on 2017-11-06 17:02:12
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