Electronics > Projects, Designs, and Technical Stuff
Processing AV video signal
(1/2) > >>
syntax333:
Hi everyone i am new in this forum so i am sorry for any terminology mistakes.

I am working with AV signal which is fed to Bias tee circuit. At output of bias tee circuit I got my AV signal Voltage shifted at a certain dc level  (for example. form 0-1V to 4-5V, so 4V voltage shift).

Now I am trying to get my original signal without voltage level shift (0-1V).

Problem is that If I use any transistor level it will output me a digital signal. If I use High-Pass filter I afraid it will also eliminate DC levels in original signal as shown in attachment. (it is original signal not the shifted version (before bias tee).)

So my question is that how can we shift the signal to its original position 0-1V?



Benta:
The usual way is to AC couple the signal and then clamp either black level or the sync pulses. For this you need to extract the sync information first, for example with an LM1881.
syntax333:
I really appreciate your answer. I will definitely try to do that.
syntax333:
I didn't understand one point, in order to reconstruct the original signal from shifted version I have to add the sync pulses from lm1881 and ac coupled signal right?
soldar:
I don't understand. Why do you want to reconstruct the original signal? Why don't you just use the original signal?
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod