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aussie_bloke wrote:Just opened up the file in "NBTV The Big Picture" and can see your fingers waving up and down, excellent progress you've made so far, keep up the great work!
gary wrote:Harry, if you have access to an old microwave oven you could rip out the turntable mechanism to make a rotating platform for the monkey - it's amazing the difference that bit of motion makes. It uses main power however, so be careful if you do. (Others, don't try this if you are not experienced/comfortable with working with mains electricity).
Lowtone wrote:I like your handmade testcard
gary wrote:Harry, for some reason your change to the encoder didn't seem to work.
Here are time base corrected versions of above in AVI - wave files available if requested (not posted this time simply because they are larger than the AVIs)
Harry, your cheeky monkey came out quite well! (abject apologies if it was, in fact, a self portrait )
harry dalek wrote:OH still problems i will take a picture of it and post ! But the missing pulse part is between the first and last line must of stuffed it up again...mmm
harry dalek wrote:Some thing is up again gary looking at the sweep tests on the pulse width i sent you on both i got no rolling bar
and the the top of the picture is not Jagged and is fine some thing has changed since then...can only think its the pulse width adjustments off again .
The rolling bar i am going to have to track down ,i know i forgot to switch off the lap top power supply which is very noisy .
Apart from that i could tell the monkey was a lot better for for what i have been getting but i know this thing still needs a bit of work to keep me busy
Well if that is the case I find it hard to explain it unless there is some sort of delay in the electronics - damn long delay though.
Do you mean the vertical bar that rolls horizontally or the rolling of the sync bar (picture)? I haven't seen any of your tests yet that doesn't have the vertical bar that scrolls across.
Well the bottom of the sync bar will be flat only because that's the trigger for the start of the line - but the top of the sync bar will be jagged NOT because of the sync width (which IS fine BTW) but because your disk speed is varying - if you look at your wave files WITHOUT sync processing you will see the sync bar being a great wavy thing - this is disk speed variation - something you haven't addressed yet.
There is SLIGHT jaggedness on both sides of my avi's because the time base correction has changed the length of the sync pulse to make all lines in the video signal the same length (i.e. correcting the line length variation due to speed variations). But I can only do this to a 1 pixel resolution without greater oversampling (perhaps I should do that actually).
Yes I think it must be something external as it is at none of the internal frequencies - but it is much lower now than it used to be.
Yes, that's the first time I have actually recognised it - so that's a big step forward.
And yes, NBTV work is good for us... keeps us off the street
And anyway, I think you are now one of a surprisingly small number of NBTVA members who have created a recognisable TV picture mechanically - well done!
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