System.out
Member level 4
Hello,
I am thinking on building a syncro generator for PAL TV signal, when syncro is supressed. I want the circuit to generate syncro lines taking as a reference when color burst isn't detected, so taking the time from last color burst we can trigger the syncro for the first line. It also needs to filter or do something attending that syncro line could be inverted, so I would use a limitator to trim the signal generated.
For the circuit I was thinking on using a PLL to follow color burst.
TV Signal -----------> Adder (+) --------------> Trimmer
..........|.............................^.....................................................TV
......... -..............................|.........................................|_ > Signal
Syncro -----------> Syncro Generator
Detector
I hope that diagram comes clear.
Problems:
* Syncro Generator -------> ¿VCO, NCO, XTAL, memory table?
* Insert syncro generated ----->
1) No detection of color burst.
2) Follow the fileds.
3) Think about something else?
* I would work with a signal form TV, a base band signal form euroconector, would that cause any problem ?
* I need trimmer in case syncro was partialy supressed to no saturate the signal.
What do you think? Any recomendation ? Any chip ?
Thanks :roll: 8)
I am thinking on building a syncro generator for PAL TV signal, when syncro is supressed. I want the circuit to generate syncro lines taking as a reference when color burst isn't detected, so taking the time from last color burst we can trigger the syncro for the first line. It also needs to filter or do something attending that syncro line could be inverted, so I would use a limitator to trim the signal generated.
For the circuit I was thinking on using a PLL to follow color burst.
TV Signal -----------> Adder (+) --------------> Trimmer
..........|.............................^.....................................................TV
......... -..............................|.........................................|_ > Signal
Syncro -----------> Syncro Generator
Detector
I hope that diagram comes clear.
Problems:
* Syncro Generator -------> ¿VCO, NCO, XTAL, memory table?
* Insert syncro generated ----->
1) No detection of color burst.
2) Follow the fileds.
3) Think about something else?
* I would work with a signal form TV, a base band signal form euroconector, would that cause any problem ?
* I need trimmer in case syncro was partialy supressed to no saturate the signal.
What do you think? Any recomendation ? Any chip ?
Thanks :roll: 8)