Tips and Tricks Video 123

DARS phase evaluation
(French and English document)
The DARS signal is sometimes created in another equipment than a SPG. In this case, it is necessary to check regularly the phase of this DARS compared to the video Sync of the system. As a matter of fact, these two signals must be synchronous and stable otherwise clicks and pops suddenly appear.
But this is not easy to do so, since one signal is analog and the other is digital, and on top of that it’s necessary to compare the BB with the content of the AES signal and not with the clock !
The trick to do that is to use a traditional oscilloscope able to trigger on a user-defined pattern in a digital stream.

Details

DARS phase evaluation (French and English document) The DARS signal is sometimes created in another equipment than a SPG. In this case, it is necessary to check regularly the phase of this DARS compared to the video Sync of the system. As a matter of fact, these two signals must be synchronous and stable otherwise clicks and pops suddenly appear. But this is not easy to do so, since one signal is analog and the other is digital, and on top of that it’s necessary to compare the BB with the content of the AES signal and not with the clock ! The trick to do that is to use a traditional oscilloscope able to trigger on a user-defined pattern in a digital stream.