The Composite TV Signal, Part 2! Vertical Blanking! (EP 45)
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- เผยแพร่เมื่อ 23 ก.ย. 2024
- Doctor Plague continues his explanation of what a composite TV signal is. This time he goes into more depth explaining the vertical blanking interval, including why equalizing pulses are needed, along with an explanation of serrations.
See if you can find J.S. Bach before the end of the video! Be sure to watch to the end to see if you were correct!
Please check out part 1 of "The Composite TV Signal":
• The Composite TV Signa...
The design of the homemade sync separator is shown in the following video ("How I Designed a Simple Video Sync Separator"):
• How I Designed a Simpl...
Category: Electronics, Technical
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This is incredible! I wish your videos were around 25 years ago. I was repairing TVs back in high school. I was good at basic troubleshooting and repair of common problems like HOT, vertical deflection collapse, power supply issues, cold joints, etc But never got into the actual theory of how the picture side actually worked as in how the information is received, processed and used to make an actual picture.
I took apart a backup camera the other day and happened to hook up my O-scope, power the camera ups and I have and didn’t understand what I was looking at on the scope screen. This video clearly explains what I wish I knew back then as the output signal nearly matches this.
Thanks for the video.
Thanks for the comment, and thanks for watching!
Good stuff! I'm trying to understand analog signal processing methods and this helped a lot.
Glad it helped! Thanks for watching!
Best (and only) explanation of these special pulses, I've ever heard. Thank you.
I guess this would have been really critical back in the days when TVs were made out of tubes, and the circuits in the TV were remarkably simple, just R's and C's as you show.
Hopefully you will explain the future how you generated the sample video signal, with or without the serration pulses.
I do plan on creating future videos showing how I created the composite video signal. I need to find time to plan out how I am going to explain it. There will be a lot I need to explain, so it will be a series of videos. I'm not sure when I will get the time to create those videos, but hopefully sooner than later. Thanks for watching!
This is gold!!!
Thank you!
I'm playing around with PAL CRT TVs recently.... and this was really useful stuff.... I like the whole plague doctor shtick too! I think I'll be watching more. It's pitched at just the right technical level for me too... not too basic, not too advanced.
Dude, I stumbled upon you when I was looking for some info about what a vertical blanking interval is. I didn't understand much. Guess, you need some experience to watch your content, but I like the way you present it. Even your wife takes part in filming while you are doing it, that's really cool. Loves from Russia, mate, keep doing watcha doing!
Glad to hear you like it. Thank you!
In old TVs the horizontal sync was phase compared to the retrace with a back-to-back diode phase detector - which had the extra benefit of wider pull-in range, as opposed to the method seen in this video
Thanks for the comment!
Great video! If I wanted to record a composite waveform from a VCR and then be able to play it back as composite again with all of the original time base errors intact, what equipment could actually do that for like a 10 second recorded/played back sample? The idea is that using an identical starting composite signal to test how well various capture cards tolerate mechanical time base errors using an identical starting signal. Thanks in advance!
Hi Doctor, I wonder if you can help me with a sync issue in my video synthesis system? I Wonder if this circuit will fix my issues.
NTSC also stands for never twice the same color.
enjoyable, informative and very well done video thanks a lot . can you make videos about LCD screan how it works in deep details we will be very happy to see it soon funny bird
As always, a great video!
You should make the video about your digital signal análise outputting composite video!
Thanks a lot!! This is my nth comment tonight o your channel! I should go sleep 😂.
See you on the one!
@Zidani Abdallah: Thank you for your comment. I will take LCD screens into consideration for possible future video ideas. Thanks for watching!
@Joao Carreira: Thank you! I do intend to make future videos on the logic analyzer, but I need to make some prerequisites to help explain some concepts first. Thanks for watching!
Will we ever see other video signals explained? Would love to see component or even RF ans why is it so bad.
Possibly sometime in the future, but I currently have no immediate plans to work with other video formats. Thanks!
hey doctor! do you have a video talking about your gadgets on your background workbench?
Sorry, no I don't. Thanks for watching!
can you make a Video where you show how to make an image inside a EEPROM or FRAM and display it with composite video?
Funny you should ask. I actually have an upcoming video in my list of future video ideas in which I demonstrate an old circuit I made that used a flash memory IC to hold image data and display it by generating a composite video signal. Then I'll be making additional videos in which I improve upon that idea. These will be coming sometime in the future. Thanks for the comment!
Now i need video how complete composite video transmit in Terrestrial television, cable television or satellite television before digital television. And show differences between PAL, SÉCAM, and NTSC
Unfortunately, I'm only familiar with NTSC, but thanks for the comment!
@@DoctorRGPlagueYou take new video about PAL, SÉCAM (color) difference s and explained this?
I like the information, but the mask thing strains credibility.