Help for audiovisual BTS with a focus on editing

Hello everyone,

so here it is, I'm 22 years old and currently registered as a private candidate for the BTS in audiovisual, specializing in editing.
I have been facing a big problem for a few months: I'M STRUGGLING

To summarize my situation, I only have two subjects to catch up on, physics and technology of equipment and media. In the latter subject, during my move, I lost my notes, and now I'm trying to redo the assignments and past BTS exams with the help of the book "Secrets of Video Image" by Pierre Bellaiche, and also the internet... The book is quite comprehensive, but even when I "try" to study it thoroughly (because it’s a huge headache for me), I can only see that there are questions that remain unanswered.

So I am currently working on the technology subject from the 2008 BTS audiovisual session.

The subject can be downloaded here: crdp.ac-bordeaux.fr/sujets/08/320/3232200/E4/U4-1Psuj.pdf

I have searched for the correction everywhere (even my academy, to which I am attached, apparently doesn't want to send me this correction, while the year before I received it), so if you have it, please feel free to send it to me.

Otherwise, I'm going to ask you a few questions today, and if I see there are nice people who aren't struggling like I am to answer me, I'll probably ask more later... In any case, thanks in advance!

So my questions:

1/ I am asked to indicate the quantifications of the A/D converter and the DSP, which according to me (based on the attached document) are 14 bits for A/D and 22 for DSP. Then, I'm asked to justify the difference between these values and the 10-bit quantification of the HD-SDI link. Well... I don't know.

2/ I would like to be reminded how to calculate a sampling frequency based on a sampling structure such as 4:2:2 or 44:22:22.

3/ What calculation is necessary to know the net bitrate for video? What calculation is required to know the gross bitrate for SDI (standard format) and HD SDI (HD format with Fe Y = 74.25 MHz)? And by the way, what is the difference between gross bitrate and net bitrate?

There you go, those are all the questions that I have no answers for regarding exercise 1 of the subject.

In any case, I truly and deeply thank, with all sorts of other words ending in -ly, the person or people who can help me succeed in this exam, as I have faced quite a few setbacks this year in this regard (and I think I am not the only one), being, I remind you, a private candidate trying to navigate through the academic administration which could be more serious with all the struggling students... but let’s keep hope and smiles everyone!!! Motivated!

Thank you. And greetings to you all

Configuration: Windows Vista Internet Explorer 7.0