Steve Anderson wrote:I'm a bit confused as to what you're trying to do here...and I'm surprised you're able to get these circuits working on all these different rates. They were (I think) meant for one particular standard, but if they work with others, that's a bonus!
What i was showing was first 23 line 24 line 25 line 26 line so up to 100 line i could of went further but showing how the bandwidth drops the image definition and Yes at 12.5 framing 23 line to 100 line it has no problem into the 100s lines framing syncing line syncing ...you did well Steve ...only a little minor adjustment add on to your circuit even i can work out so it is minor !
It should be possible to concoct a device that will detect the missing pulse on many and various standards. It may only need to be told how many lines there should be...maybe...thinking a moment...I'll come back to this...an interesting challenge...
I think its possible it seems ok with a lower framing rate missing pulse as is i tried a 5 and 6 frames a sec video and it worked but say 13 or 14 or 25 nope it can't do that yet i think i would need to also speed up the framing saw tooth oscillator and switch in another capacitor or 2 other than 1uf as is at the moment for 12.5 hz at teh moment it can't go to higher in frequency is my guess .
...it shouldn't be that hard...maybe...and an interesting diversion...though maybe I have enough already!
I don't really need it at the moment but as above mentioned if its just switching in another capacitor or 2 for say a 25 frame a sec video or 50 why not ...i am off later in the week i will try and show how it go's
Queued up already are 1) SSTV-VGA up-converter, [Work in progress] 2) Updated 'ROMscanner', [In design phase] 3) Perhaps this [In conceptual stage]...but it's all my own fault!!
Thats ok Steve as i also said one road leads to another can be endless i started on the phonoVision now i am on a CRT again where you need one thing to test the other !
Just on them all in bits something will get finished is my philosophy !
The good news is...they're getting simpler as time goes on...I tend to switch between one and another...as the mood takes me...I hit an impasse on one and divert to another, then come back to the original with a (perhaps) fresh mind...
Steve A.
Well that's a good thing complex to less complex is the way to go ...for me i am fine waiting to see how yours up converter go's ,i know you need to swap and enjoy your hobby and do other stuff to .
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
